Abstract

The present application relates to the technical field of image processing, and relates to a lattice structure identification method and apparatus for a conductive carbon black, and a computer system. The method comprises: acquiring a sample electron-microscope image of a conductive carbon black, labeling in the sample electron-microscope image a crystal structure of the conductive carbon black, and establishing a sample data set on the basis of the labeled sample electron-microscope; inputting the sample data set into an initial mask R-CNN model for model training, so as to acquire a target mask R-CNN model; and inputting into the target mask R-CNN model an image to be subjected to detection, so as to acquire an identification result for a crystal structure of a conductive carbon black in the image to be subjected to detection. By means of the method, the efficiency and accuracy of lattice structure identification can be improved. In addition, the present application also relates to the field of computers.

IPC Classes  ?

• G06V 10/26 - Segmentation of patterns in the image fieldCutting or merging of image elements to establish the pattern region, e.g. clustering-based techniquesDetection of occlusion

Abstract

A hybrid MMC transient simulation method and apparatus based on interpolation in a blocking mode, and a device, which relate to the technical field of power system calculation and analysis. In the method, data in a previous time step of transient simulation of a hybrid MMC is acquired; pre-determination is first performed to obtain a pre-determined blocking working mode; the Thevenin equivalent resistance of a bridge arm is calculated on the basis of the pre-determined blocking working mode; then, a Norton circuit is simulated on the basis of the Thevenin equivalent resistance of the bridge arm, and simulation calculation is performed to obtain the bridge arm voltage of the bridge arm in a current time step, such that the number of switches is greatly reduced, and the simulation efficiency is higher; and finally, whether the pre-determined blocking working mode is correct is verified on the basis of the bridge arm voltage in the current time step and a total capacitive Thevenin equivalent voltage in the previous time step, and an incorrect blocking working mode is corrected, so as to obtain more accurate simulation data of the hybrid MMC. The technical problem of the simulation accuracy being low due to an interpolation problem in existing simulations of the hybrid MMC in a blocking mode of the MMC is solved.

IPC Classes  ?

• G06F 30/367 - Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods

Abstract

The present application relates to the technical field of image processing. Disclosed are a lattice parameter extraction method and apparatus for a conductive carbon black, and a computer device. The method comprises: acquiring an original electron-microscope image of a conductive carbon black, and acquiring a binarized image on the basis of the original electron-microscope image; traversing pixel points, the values of which are 0, in the binarized image, and acquiring effective pixel points, which meet a preset condition; executing a compensation operation on the binarized image, which involves: traversing the effective pixel points, and for each effective pixel point, if the proportion of pixel points, the values of which are I, in a preset region corresponding to the effective pixel point is less than a first threshold value, assigning the pixel points, the values of which are 1, in the preset region the value of 0, and if adjacent main body regions meet a preset condition, bridging the adjacent main body regions; and on the basis of the binarized image, which has been subjected to the compensation operation, extracting lattice fringes and acquiring shape parameters of the lattice fringes. By means of the method, the accuracy of parameter extraction performed on lattice fringes can be improved. In addition, the present application also relates to the field of computers.

IPC Classes  ?

• G06T 7/60 - Analysis of geometric attributes

Abstract

A PJVS quantum voltage step-wave amplitude calculation method, apparatus and device. The method comprises: on the basis of Fourier transform, performing fitting calculation on data points which are collected from a PJVS step wave, so as to obtain an initial signal array, wherein the PJVS step wave comprises a plurality of voltage steps; using a preset S function to perform weight calculation analysis on the basis of the initial signal array, so as to obtain a target weight array; and on the basis of the target weight array, calculating a PJVS quantum voltage step-wave fundamental-wave amplitude, so as to obtain a target fundamental-wave amplitude. During this process, full use is also made of sampling data which is affected by a transition region and a Gibbs phenomenon, and the accuracy and reliability of voltage reproduction can also be ensured by means of specific calculation. Therefore, the technical problems in the prior art of data of a transition region being discarded, and there being a lack of stability and reliability in voltage reproduction can be solved.

IPC Classes  ?

• G06F 17/10 - Complex mathematical operations
• G01R 19/00 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof

Abstract

A broadband measurement method and apparatus for a power system, and a computer device, which relate to the technical field of broadband measurement. The method comprises: acquiring a target electrical signal; on the basis of a local mean decomposition algorithm, decomposing in a time domain the target electrical signal into a plurality of signal components having a single frequency; determining the instantaneous frequency of each signal component; on the basis of the instantaneous frequencies, determining a corresponding time-frequency transformation algorithm and a corresponding time-frequency transformation parameter; and on the basis of the corresponding time-frequency transformation parameter, using the corresponding time-frequency transformation algorithm to perform time-frequency transformation on each signal component, so as to obtain a broadband spectrum that comprises frequency-domain information corresponding to each signal component. The method is applicable to spectrum analysis performed on a voltage/current signal that includes a plurality of signal components, the calculation is quickly and precisely performed, the broadband measurement requirements of a new power system can be met, and a strong support is provided for constructing a wide-frequency-oscillation wide-area monitoring system for the power system.

IPC Classes  ?

• G01R 23/16 - Spectrum analysisFourier analysis
• G01R 23/02 - Arrangements for measuring frequency, e.g. pulse repetition rateArrangements for measuring period of current or voltage
• G06F 17/14 - Fourier, Walsh or analogous domain transformations
• G06F 17/18 - Complex mathematical operations for evaluating statistical data

Abstract

A wide-band oscillation wide-area monitoring system and a wide-band oscillation source localization method, which relate to the technical field of power system stability. The wide-band oscillation wide-area monitoring system comprises: a plurality of signal sensing modules, configured to acquire electrical signals from measured points; a plurality of wide-band measurement devices connected to the signal sensing modules, each wide-band measurement device being configured to perform spectrum analysis on the basis of electrical signals acquired by each signal sensing module, and generate oscillation alarm information on the basis of the spectrum analysis result, and the wide-band measurement devices being further configured to: in response to a waveform recording instruction, start to carry out waveform recording to generate waveform recording files for a same time section, and upload the waveform recording files and the spectrum analysis results; and a wide-band measurement master station in communication connection with each wide-band measurement device, the wide-band measurement master station being configured to: on the basis of the oscillation alarm information uploaded by each wide-band measurement device, determine whether a wide-band oscillation risk is present for a power system, and if so, send the waveform recording instruction to all of the wide-band measurement devices, and on the basis of the spectrum analysis result fed back by each wide-band measurement device, perform oscillation source localization.

IPC Classes  ?

• G01R 23/163 - Spectrum analysisFourier analysis adapted for measuring in circuits having distributed constants

Abstract

An energy self-balancing flexible direct-current converter valve, a control method, and a direct-current system, which relate to the technical field of power transmission and distribution networks. The converter valve comprises three phase units, and each phase unit comprises an upper leg and a lower leg. The upper legs and the lower legs each comprise a plurality of full-bridge energy self-balancing submodules and a plurality of half-bridge energy self-balancing submodules. Each of the full/half-bridge energy self-balancing submodules is an optimized MMC submodule comprising an energy self-balancing circuit. The energy self-balancing circuit is composed of a power electronic switch and an energy dissipation resistor connected in series, and is used for dissipating surplus energy when an overvoltage early warning occurs for the capacitor voltage of the submodule. The present application, without affecting the operational logic of conventional converter valves and at low costs, can solve the technical problem of surplus power not being dissipated promptly due to faults occurring in a direct-current power transmission system in a new energy islanded ultra-long-distance direct-current delivery scenario. Meanwhile, temporary energy stored in the capacitors of the optimized MMC submodules can be fully utilized, reducing the waste generated by surplus power dissipated as heat.

IPC Classes  ?

• H02M 1/32 - Means for protecting converters other than by automatic disconnection
• H02M 7/219 - Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration

Abstract

A control system hardware resource optimization method and apparatus, relating to the technical field of simulation systems. The method comprises: dividing a system to be simulated into an electrical system and a control system, and on the basis of the topological structure and the computing type of the control system, constructing a control system solution hardware resource optimization model in which the minimum weighted sum of a control system solution computing resource, a storage resource and a time resource is used as an objective function; solving the control system solution hardware resource optimization model to output a hardware resource optimization result; and downloading the hardware resource optimization result to an FPGA real-time simulator for simulation. The technical problems in the prior art of long hardware debugging time and low efficiency caused by manual design of hardware in the simulation preparation process are solved.

IPC Classes  ?

• G05B 23/02 - Electric testing or monitoring

Abstract

A harmonic state estimation method and apparatus for an AC/DC hybrid power grid, a device, and a medium. The method comprises: acquiring a grid topology structure, element parameters, and broadband measurement data of an AC/DC hybrid power grid containing LCC-HVDC and MMC-HVDC; on the basis of the grid topology structure and the element parameters, establishing an AC system measurement equation, an LCC DC system measurement equation, and an MMC DC system measurement equation; on the basis of the AC system measurement equation, the LCC DC system measurement equation, and the MMC DC system measurement equation, constructing a harmonic state estimation model for the AC/DC hybrid power grid; and, on the basis of the broadband measurement data, solving the harmonic state estimation model to obtain a harmonic state estimation amount of the AC/DC hybrid power grid. According to the present invention, it is possible to acquire a global harmonic distribution state of a power grid, and the results are accurate. The global harmonic state is analyzed on the basis of the broadband measurement data, enabling broadband harmonic estimation requirements to be met.

IPC Classes  ?

• H02J 3/00 - Circuit arrangements for ac mains or ac distribution networks
• H02J 3/01 - Arrangements for reducing harmonics or ripples
• G01R 23/16 - Spectrum analysisFourier analysis
• G06F 17/12 - Simultaneous equations

Abstract

A roughened-film production control method and system. The method comprises: S1, adjusting a melting temperature such that same is within a range from 230℃ to 240℃, and adjusting the temperature of sheet casting such that same is within a range from 80℃ to 90℃; S2, measuring the light transmittance of a longitudinally stretched thin film; S3, determining whether the light transmittance of the thin film is within a preset range; S4, if the light transmittance of the thin film is within the preset range, keeping the current melting temperature and the temperature of the sheet casting unchanged; and S5, if the light transmittance of the thin film is not within the preset range, adjusting, on the basis of the magnitude of the light transmittance of the thin film, the melting temperature and the temperature of the sheet casting according to a preset step length, and returning back to step S2. By means of testing the light transmittance of a longitudinally stretched thin film online, temperatures are controlled in melting and sheet casting stages, thereby realizing continuous control over the surface roughness and porosity of a capacitor thin film. The technical problems of it being difficult to apply an existing roughened-film drawing process to various roughened-film materials, the efficiency being low, and materials being wasted are solved.

IPC Classes  ?

• B29C 55/00 - Shaping by stretching, e.g. drawing through a dieApparatus therefor
• B29C 48/00 - Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired formApparatus therefor
• B29C 43/00 - Compression moulding, i.e. applying external pressure to flow the moulding materialApparatus therefor
• H01G 4/00 - Fixed capacitorsProcesses of their manufacture
• G01N 21/59 - Transmissivity

Abstract

6 exhaust gas in the plasma reactor for reaction, thereby ensuring safe operation and low energy consumption.

IPC Classes  ?

• C01G 41/04 - Halides
• B01J 19/00 - Chemical, physical or physico-chemical processes in generalTheir relevant apparatus

Abstract

A comprehensive control method and apparatus for a power fluctuation-stabilizing energy storage system, and a device, which relate to the technical field of energy storage systems and are applied to an integrated energy storage system of new energy power transmission. The integrated energy storage system of new energy power transmission comprises an integrated energy storage module. In the method, stabilizing power is calculated by means of empirical mode decomposition, so that the energy storage rated power requirement and the operational burden of the integrated energy storage system of new energy power transmission can be reduced in the operation of grid-connected power corresponding to the stabilizing power. An energy storage integrated control mode is used to control the integrated energy storage module to operate at an optimal depth of discharge, so that the cycle life of the integrated energy storage module is fully utilized, and the service life of the integrated energy storage module is prolonged, thereby solving the technical problems of low system operational efficiency and short service life of energy storage elements thereof in power fluctuation stabilizing processes of existing new energy power transmission systems.

IPC Classes  ?

• H02J 3/32 - Arrangements for balancing the load in a network by storage of energy using batteries with converting means
• H02J 3/24 - Arrangements for preventing or reducing oscillations of power in networks
• H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers

Abstract

A voltage source type direct-current ice melting apparatus, a flexible interconnection system and a control method are provided. The voltage source type direct-current ice melting apparatus includes a starting unit, a modular multi-level converter and a measurement control unit. The flexible interconnection system includes two voltage source type direct-current ice melting apparatuses having the same circuit structure. The measurement control unit acquires set values, that are input by a user, of relevant parameters and then processes the set values, that are input by the user, of the relevant parameters and measured values, measured in real time by the measurement control unit, of the relevant parameters, thereby determining and sending a control signal, so as to control an operating state of the modular multi-level converter in the apparatus or system.

IPC Classes  ?

• H02G 7/16 - Devices for removing snow or ice from lines or cables
• H05B 1/02 - Automatic switching arrangements specially adapted to heating apparatus
• H05B 3/00 - Ohmic-resistance heating

Abstract

A high-voltage cable polypropylene insulating material is provided in the present application, wherein using a polypropylene in-reactor alloy resin as a composite material skeleton can endow the high-voltage cable polypropylene insulating material with excellent heat resistance; and a thermoplastic polyolefin elastomer can induce interface shear bands or crazes, and therefore by means of the shear bands or crazes, can dissipate the energy acted by the external force, so that the high-voltage cable polypropylene insulating material can hold an excellent mechanical strength even at a high temperature. In addition, the polypropylene in-reactor alloy resin and the thermoplastic polyolefin elastomer in said insulating material have good compatibility, and thus enable the high-voltage cable polypropylene insulating material to have relatively low bending modulus and relatively high breakdown field strength. Therefore, said insulating material has excellent toughness and electrical properties, thereby satisfying application conditions of high-voltage cable polypropylene insulating materials.

IPC Classes  ?

• C08L 23/10 - Homopolymers or copolymers of propene
• C08L 23/12 - Polypropene

Abstract

A method for detecting the leakage of a submarine oil substance, the method comprising: mounting a solid-liquid separator on an underwater detector to obtain a detection device (S1); using the detection device to collect water samples at different depths and locations in a water area, and testing the water samples at different depths and locations by using a solid-liquid separation element of the detection device, so as to obtain corresponding water sample feature peaks (S2); extracting from the water sample feature peaks an oil substance type and an oil substance concentration which correspond to each water sample (S3); and performing analysis on the basis of oil substance types and oil substance concentrations which correspond to all the water samples, so as to determine whether oil substances are leaking in the water area (S4). An apparatus for detecting the leakage of a submarine oil substance, and a device are provided. By means of a detection device, water sample feature peaks corresponding to water samples at different depths and locations are obtained, and different types of oil substances and oil substance concentrations are obtained from the water sample feature peaks, thereby improving the accuracy and sensitivity of detection; and analysis is performed on the basis of the oil substance concentrations to determine whether oil substances are leaking in a water area, such that the detection of the leakage of oil substances in water samples is realized.

IPC Classes  ?

• G01M 3/28 - Investigating fluid tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables, or tubesInvestigating fluid tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipe joints or sealsInvestigating fluid tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for valves
• G01M 3/20 - Investigating fluid tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
• G01M 3/22 - Investigating fluid tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables, or tubesInvestigating fluid tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipe joints or sealsInvestigating fluid tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for valves
• G01M 3/02 - Investigating fluid tightness of structures by using fluid or vacuum

Abstract

An oil-filled cable inspection method and apparatus for a sea surface insulation medium, and a device, relating to the technical field of oil-filled submarine cable inspection. The method comprises: obtaining relationship curve data between a fluorescence intensity and an insulation medium concentration in seawater; inspecting seawater at different positions on a sea surface by using a fluorescence signal of an oil-filled cable inspection apparatus to obtain a fluorescence signal intensity corresponding to the seawater at each position; analyzing the fluorescence signal intensity on the basis of the relationship curve data, to obtain an insulation medium concentration of the seawater corresponding to each position; and performing analysis on the basis of all of the insulation medium concentrations and all of the fluorescence signal intensities, to determine a leakage point position of a cable insulation medium in the seawater. According to the method, rapid inspection of leakage of the oil-filled submarine cable is implemented by inspecting the seawater at the different positions on the sea surface by means of the fluorescence signal of the oil-filled cable inspection apparatus, and the leakage point position of the cable insulation medium in the seawater is determined on the basis of the fluorescence signal intensities and the insulation medium concentrations obtained through analysis, so that the rapid and accurate positioning of the leakage point position of the oil-filled submarine cable is implemented, and the inspection cost is low.

IPC Classes  ?

• G01M 3/28 - Investigating fluid tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables, or tubesInvestigating fluid tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipe joints or sealsInvestigating fluid tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for valves

Abstract

A fault ride-through method and apparatus for a new energy transmission system, and an electronic apparatus, relating to the technical field of new energy grid connection and flexible direct-current power transmission. The method comprises: acquiring a voltage parameter of a grid-connected inverter and a voltage of an alternating-current system, the voltage parameter comprising at least one of the following: an alternating-current voltage of the grid-connected inverter, a direct-current voltage of the grid-connected inverter, and a direct-current voltage change rate; on the basis of at least one of the voltage parameter and the voltage of the alternating-current system, determining whether a low-voltage fault has occurred in a new energy transmission system; and when a low-voltage fault has occurred in the new energy transmission system, adjusting the new energy transmission system at least according to a preset adjustment method, so that the new energy transmission system carries out fault ride-through within a preset duration, the preset adjustment method comprising at least one of the following: adjusting the active current of the grid-connected inverter and adjusting the integral element of a flexible direct-current system. The problem of lack of a fault ride-through method suitable for a large-scale new energy flexible direct-current transmission system is solved.

IPC Classes  ?

• H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers

Abstract

A lattice-based proxy signature method, apparatus and device, a lattice-based proxy signature verification method, apparatus and device, and a storage medium. Polynomials are randomly selected in rings to calculate public and private keys of nodes, and the magnitudes of proxy public and private keys are the same as the magnitudes of public and private keys of an original signer. Therefore, compared with existing proxy signature schemes, the present application has smaller lengths of public and private keys and higher storage efficiency. Proxy signature information generated in the present application shows a signature of the original signer and also shows a signature of a proxy signer. Once a proxy signature is created, the proxy signature cannot be repudiated by the proxy signer, and has strong non-repudiation and strong unforgeability. The proxy signature method has the advantage of resisting quantum computer attack.

IPC Classes  ?

• H04L 9/30 - Public key, i.e. encryption algorithm being computationally infeasible to invert and users' encryption keys not requiring secrecy
• H04L 9/32 - Arrangements for secret or secure communicationsNetwork security protocols including means for verifying the identity or authority of a user of the system

Abstract

A water droplet collision coefficient determination method for icing of wind turbine blades. The method comprises: calculating influence coefficients and disturbance potential data of wind turbine blade boundaries on the basis of a coordinate set of the wind turbine blade boundaries in combination with a boundary element algorithm; calculating an airflow speed of a boundary outfield area point; on the basis of an initialized water droplet and the airflow speed and by means of a Lagrange algorithm, determining the stress state of the water droplet; tracking a motion trajectory of the water droplet, and when the water droplet collides with the surface of a wind turbine blade, determining the collision position and collision speed of the water droplet; and obtaining a local collision coefficient of the collision position of the water droplet on the basis of the collision speed, a normal vector of the collision position, and the airflow speed.

IPC Classes  ?

• G06F 30/20 - Design optimisation, verification or simulation
• G06F 119/14 - Force analysis or force optimisation, e.g. static or dynamic forces
• G06F 113/06 - Wind turbines or wind farms

Abstract

A vibrating reed structure for vibration deicing, comprising a keel and fin groups. Each fin group comprises a plurality of fins; the fins are of a rose curve shape; and the plurality of fins are linearly and evenly arranged on the keel at intervals and are symmetrically arranged in the length direction of the keel. According to the solution, by means of the plurality of fins linearly and symmetrically arranged along the keel, most areas of the edges of blades can be covered, and the vibration amplitude is increased, thereby improving the deicing effect, facilitating engineering application, and effectively solving the problem that existing solutions to the icing problem of blades of a wind driven generator cannot give consideration to the good deicing effect, convenient engineering application and large covered deicing area.

IPC Classes  ?

• F03D 80/40 - Ice detectionDe-icing means

Abstract

A method, apparatus, and device for calculating lifecycle carbon footprints of an electric reactor, relating to the field of carbon footprint assessment. The method comprises: dividing the life cycle of an oil-immersed reactor into a material acquisition link, an oil-immersed reactor production link, an on-site assembly link, an oil-immersed reactor operation link, an oil-immersed reactor maintenance link, and a decommissioning disposal link; calculating a material acquisition carbon footprint of the material acquisition link, a production carbon footprint of the oil-immersed reactor production link, an assembly carbon footprint of the on-site assembly link, an operation carbon footprint of the oil-immersed reactor operation link, a maintenance carbon footprint of the oil-immersed reactor maintenance link, and a decommissioning carbon footprint of the decommissioning disposal link; and gathering the material acquisition carbon footprint, the production carbon footprint, the assembly carbon footprint, the operation carbon footprint, the maintenance carbon footprint, and the decommissioning carbon footprint to form lifecycle carbon footprints of the oil-immersed reactor. The carbon footprints in all links are calculated to complete calculation of the lifecycle carbon footprints of the oil-immersed reactor.

IPC Classes  ?

• G06Q 50/06 - Energy or water supply

Abstract

A method, apparatus and device for calculating an overhaul carbon footprint of a transformer, and a readable storage medium, which relate to the field of carbon footprint calculation. The method comprises: determining a target oil-immersed power transformer, and determining each maintenance link during an overhaul process of the target oil-immersed power transformer; and acquiring maintenance parameters of each maintenance link during the overhaul process of the target oil-immersed power transformer, and calculating a carbon footprint of each maintenance link according to the maintenance parameters. In this way, an overhaul process is divided into a plurality of links, a carbon footprint of each link is calculated in a targeted manner, and compared with direct calculation of a carbon footprint of the whole overhaul process, the method is more accurate, and simplifies the difficulty in calculation; and carbon footprints of maintenance links are aggregated to form an overhaul carbon footprint of a target oil-immersed power transformer. It can be seen that by means of the method, a complex overhaul process can be split into a plurality of maintenance links, and a carbon footprint of each maintenance link is calculated according to maintenance parameters of each maintenance link, thereby completing the calculation of an overhaul carbon footprint.

IPC Classes  ?

• G06Q 50/06 - Energy or water supply
• G06Q 10/20 - Administration of product repair or maintenance
• G06Q 10/10 - Office automationTime management

Abstract

A photovoltaic fault ride-through control method and apparatus, a storage medium, and a computer device, relating to the technical field of pure new energy flexible-direct-current-based island output systems. The method comprises: acquiring the voltage of a photovoltaic end and the voltage of a photovoltaic direct-current side; if the voltage of the photovoltaic end is less than a low-voltage ride-through entry threshold or the voltage of the photovoltaic direct-current side is greater than a direct-current voltage threshold, triggering low-voltage ride-through; on the basis of a reactive current instruction value before a fault and a reactive current injection coefficient, determining a reactive current instruction value during the fault; on the basis of the smaller value among an active current instruction limiting value and an active current instruction value before the fault, determining an active current instruction value during the fault; performing power reduction control on a photovoltaic side; acquiring the voltage of the photovoltaic end and the voltage of the photovoltaic direct-current side in real time; and if the voltage of the photovoltaic end is greater than a low-voltage ride-through exit threshold and the voltage of the photovoltaic direct-current side is not greater than the direct-current voltage threshold, performing a fault recovery process. The present application can improve the transient stability of a photovoltaic flexible-direct-current-based island output system.

IPC Classes  ?

• H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers
• H02J 3/50 - Controlling the sharing of the out-of-phase component
• H02J 3/48 - Controlling the sharing of the in-phase component
• H02J 3/36 - Arrangements for transfer of electric power between ac networks via a high-tension dc link

Abstract

A flexible direct-current fault ride-through control method and apparatus, a storage medium, and a device, which relate to the technical field of power system control. The method comprises: acquiring an alternating-current side terminal voltage of a converter valve and an externally transmitted power of a flexible direct-current converter station; if the alternating-current side terminal voltage is lower than a low-voltage ride-through threshold, triggering low-voltage ride-through, and acquiring an active power instruction value during a fault period; determining a second integrator coefficient during the fault period according to the difference between the active power instruction value and the externally transmitted power; switching an integrator coefficient of a voltage outer-loop controller from a pre-fault first integrator coefficient to the second integrator coefficient; the difference between the active power instruction value during the fault period and the externally transmitted power having a negative correlation relationship with the second integrator coefficient; acquiring an alternating-current side terminal voltage in real time; and if the real-time value of the alternating-current side terminal voltage is higher than the low-voltage ride-through threshold, executing fault recovery, and switching the integrator coefficient of the voltage outer-loop controller to the first integrator coefficient. The present application can improve the stability of an isolated island system that transmits new energy by means of flexible direct current.

IPC Classes  ?

• H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers
• H02J 3/48 - Controlling the sharing of the in-phase component
• H02J 13/00 - Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the networkCircuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
• H02J 3/36 - Arrangements for transfer of electric power between ac networks via a high-tension dc link

Abstract

A manufacturing method for a heavy-load 10kV lightning arrester having a large flowing current, the method comprising: performing a direct-current reference voltage test on valve blocks to be selected, so as to obtain a target valve block, the target valve block meeting the following conditions: the large-current surge tolerance capacity is greater than or equal to 100kA, the flowing current capacity is greater than 600A, the residual voltage under a 10kA flowing current is less than or equal to 45kV, and the repeat transfer charge capacity is greater than or equal to 0.8C; and assembling a fiberglass epoxy resin layer and an electrode pair into a sealed housing, such that the target valve block is located in a chamber of the sealed housing, and the target valve block is separately and electrically connected to a first electrode of the electrode pair and a second electrode of the electrode pair so as to form a heavy-load 10kV lightning arrester having a large flowing current. The problems of frequent faults of lightning arresters in the prior art are solved.

IPC Classes  ?

• H01C 17/02 - Apparatus or processes specially adapted for manufacturing resistors adapted for manufacturing resistors with envelope or housing

Abstract

A method and apparatus for calculating the electric arc radiation energy of an electric power switch device, and a device. The method comprises: constructing a two-dimensional electric arc simulation model for an electric power switch device according to a fundamental equation of two-dimensional magnetohydrodynamics; performing iterative calculation in the two-dimensional electric arc simulation model according to the initial temperature and initial pressure of the electric power switch device, so as to obtain temperature data that meets iterative constraint conditions; and according to the temperature data and the electric arc radius of the electric power switch device, calculating the electric arc radiation energy of the electric power switch device. Radiation calculations of different regions of an electric arc are taken into consideration, such that a calculated radiation energy result has a high accuracy and a rational physical mechanism, the existing need to solve a radiation transport equation is avoided, the radiation calculation time is greatly reduced, the calculation efficiency is improved, and the method is more suitable for simulation calculation of electric arcs in the field of electric power industry. The technical problem of the results of electric arc calculations of existing circuit breakers obtained by means of using existing radiation transport equations being inaccurate due to the dependency of radiation of the circuit breakers on space and spectra is solved.

IPC Classes  ?

• G06F 30/28 - Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
• G06F 111/04 - Constraint-based CAD
• G06F 113/08 - Fluids
• G06F 119/14 - Force analysis or force optimisation, e.g. static or dynamic forces
• G06F 119/08 - Thermal analysis or thermal optimisation

Abstract

A link library universal system, and a control method and apparatus for the link library universal system. The system comprises: a work station (10), used to store multiple link libraries (11), wherein each link library (11) is a set of library files used in a link process; multiple simulators (12), used to realize hardware simulation; and a universal apparatus (13), in communication connection with the work station (10) and the multiple simulators (12), wherein the universal apparatus (13) is used for calling any link library (11) and sending the called link library (11) to any simulator (12). The multiple link libraries (11) are combined, and the multiple simulators (12) are also combined; any link library (11) is called by means of using the universal apparatus (13), and each called link library (11) is sent to any simulator (12), so that the link libraries and simulation platforms can be arranged in multiple pairs. In other words, the link libraries are shared, so that users can perform simulation by means of using different platforms and different link libraries, thereby improving user experience.

IPC Classes  ?

• G06F 30/20 - Design optimisation, verification or simulation

Abstract

An electric power stability control simulation model construction method and apparatus, and an electric power stability control simulation system. According to an external interface function extracted from a stability control device program, a corresponding callback interface function is generated by using the external interface function, and an electric power stability control simulation model is constructed by means of the callback interface function in combination with the correspondence between the callback interface function and the external interface function. When the electric power stability control simulation model is executed to perform a simulation test, the corresponding external interface function can be called by means of the callback interface function, so that the function simulation of the corresponding stability control device program can be realized.

IPC Classes  ?

• G06F 30/20 - Design optimisation, verification or simulation

Abstract

Disclosed are a simulation check method and apparatus for short-circuit current setting calculation, and a storage medium, which relate to the technical field of relay protection. First, full instantaneous values of three-phase currents of branch currents at all protection mounting positions of a target power system are accurately calculated by using electromagnetic transient simulation; by using algorithms such as fault component extraction, power-frequency component extraction, and positive-, negative- and zero-sequence extraction, amplitudes and phase angles of sequence components of branch current power-frequency fault components, effective values of the branch current power-frequency fault components, and phase angles of the branch current power-frequency fault components are then extracted; and an electromagnetic transient simulation check is performed on a short-circuit current setting calculation result by means of defined relative errors of checked quantities. Thus, a simulation check for short-circuit current setting calculation is implemented, and the advantages of high accuracy, flexible use and strong applicability are achieved.

IPC Classes  ?

• G01R 35/00 - Testing or calibrating of apparatus covered by the other groups of this subclass

Abstract

A response interaction system for intelligently interacting with a low-voltage user includes: a distribution network and system master station, an intelligent electric meter, a mobile APP, an intelligent interaction terminal, an intelligent gateway, and a low-voltage user load. In the process of the low-voltage user participating in the demand response, the distribution network and system master station publishes a demand response plan and a demand response notification through the mobile APP, the low-voltage user receives the demand response plan and the demand response notification through the mobile APP, the low-voltage user is connected to the intelligent interaction terminal through the mobile APP and controls a load to operate or not operate through the intelligent gateway, to perform the demand response task.

IPC Classes  ?

• H02J 3/14 - Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
• H02J 13/00 - Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the networkCircuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network

Abstract

A method and a system for determining a direct current (DC) loop impedance are provided. The method includes: establishing an impedance model for a DC loop of a high-voltage direct current (HVDC) system; scanning parameters in the HVDC system based on the impedance model, to obtain a feasible region of each of the parameters; substituting, for each of the parameters, the parameter in the feasible region into a DC loop impedance equation, to obtain an impedance corresponding to the parameter, the DC loop impedance equation being obtained by transforming the impedance model; and comparing, for each of the parameters, the impedance corresponding to the parameter with a target impedance value, and determining the impedance that meets the target impedance value and the parameter corresponding to the impedance as an optimal impedance and an optimal parameter of the DC loop.

IPC Classes  ?

• G06F 30/373 - Design optimisation
• G06F 111/06 - Multi-objective optimisation, e.g. Pareto optimisation using simulated annealing [SA], ant colony algorithms or genetic algorithms [GA]

Abstract

Disclosed in the present invention are a method and apparatus for determining a winding state of a transformer, and a transformer. The method comprises: performing de-noising processing on a vibration signal of a transformer, so as to obtain a de-noised vibration signal; performing feature extraction on the de-noised vibration signal in a plurality of feature extraction dimensions, so as to obtain a plurality of feature values of the vibration signal; and inputting the plurality of feature values into a winding state assessment model, so as to process the plurality of feature values by using the winding state assessment model to obtain a winding state of the transformer, wherein the winding state assessment model is obtained by means of training by machining learning using a plurality of groups of training data, and each of the plurality of groups of training data comprises: a feature value and a winding state corresponding to the feature value. The present invention solves the technical problem, in the related art, of it being impossible to comprehensively and accurately reflect an operation state of a winding by means of feature extraction and analysis on the basis of a single mode during winding state assessment of a transformer.

IPC Classes  ?

• G06F 18/10 - Pre-processingData cleansing
• G06F 18/213 - Feature extraction, e.g. by transforming the feature spaceSummarisationMappings, e.g. subspace methods
• G06F 18/24 - Classification techniques
• G06F 18/214 - Generating training patternsBootstrap methods, e.g. bagging or boosting
• G06F 18/2411 - Classification techniques relating to the classification model, e.g. parametric or non-parametric approaches based on the proximity to a decision surface, e.g. support vector machines
• G06N 20/10 - Machine learning using kernel methods, e.g. support vector machines [SVM]
• G01H 17/00 - Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the other groups of this subclass

Abstract

Provided is an electric power safety authentication device, including a front casing, a rear casing, a sealing element, and a fastener connection structure. A sealing groove that matches the sealing element is provided at connection between the front and rear casings. The fastener connection structure comprises a first connector, a second connector, a first fastener, a second fastener, a first spring, and second springs. The first fastener is arranged on the front casing, and the second fastener is arranged on the rear casing. The first fastener and the second fastener each comprise a first clamp and a second clamp. The first connector is fit in and fastened to the first fastener, and the second connector is fit in and fastened to the second fastener.

IPC Classes  ?

• H02B 1/28 - CasingsParts thereof or accessories therefor dustproof, splashproof, drip-proof, waterproof or flameproof
• H02B 1/16 - Earthing arrangements
• H02B 1/46 - BoxesParts thereof or accessories therefor

Abstract

A trusted anonymous voting method includes: performing a hash operation on original voting content to obtain a hash output including a commitment value cvi; blinding the commitment value cvi based on information of other voters to obtain commitment value tuples {tilde over (c)} and {tilde over (x)}; signing the commitment value tuple {tilde over (c)} by using an ESDSA to obtain a signature tuple {tilde over (s)}; and establishing a vote tuple ({tilde over (c)}, {tilde over (s)}, {tilde over (d)}) based on the commitment value tuple {tilde over (c)}, the signature tuple {tilde over (s)} and a signature tuple {acute over (d)} of other voters, and uploading the vote tuple (ć, ś, {acute over (d)}) and the commitment value tuple {tilde over (x)} to the blockchain, where signature tuple {tilde over (d)} is generated in a case that other voters verify the signature tuple {tilde over (s)} and the signature tuple {tilde over (s)} passes the verification, and the commitment value tuple {tilde over (x)} is used to decrypt the vote tuple.

IPC Classes  ?

• G06Q 50/06 - Energy or water supply

Abstract

A timestamp generation method and apparatus, and an electronic device and a storage medium, which are used for solving the technical problem of recorded information being easily leaked because a trusted third party is usually needed as a timestamp authority for recording in a traditional trusted timestamp generation method. In the present invention, the method comprises: acquiring a file record; calculating a hash value of the file record; sending the hash value to a random issuer, and receiving a signature result returned by the random issuer, wherein the signature result is generated after the random issuer signs the hash value and a receiving time, and the receiving time is the time when the random issuer receives the hash value; and storing the signature result in a blockchain as a timestamp of the file record.

IPC Classes  ?

• H04L 9/08 - Key distribution
• H04L 9/30 - Public key, i.e. encryption algorithm being computationally infeasible to invert and users' encryption keys not requiring secrecy
• H04L 9/32 - Arrangements for secret or secure communicationsNetwork security protocols including means for verifying the identity or authority of a user of the system

Abstract

A blockchain-based interconnected vehicle authentication system and method. During message signature process, a registered vehicle verifies a driver, and broadcasts a message. During a message verification process, a registered vehicle checks the message authentication code from a received message based on the system key, and verifies the message based on a public key of a sender of the message. During a block generation and verification process, the first local trust authority broadcasts a block, and share the block to the second local trust authorities after the block passes verification. During a block confirmation process, second local trust authority makes confirmation with regard to the block and send a confirmation result to the root trust authority, to allow the root trust authority link the block into the blockchain in response to receiving confirmation results from second local trust authorities in a quantity exceeding a predetermined number.

IPC Classes  ?

• H04L 9/32 - Arrangements for secret or secure communicationsNetwork security protocols including means for verifying the identity or authority of a user of the system
• H04L 9/00 - Arrangements for secret or secure communicationsNetwork security protocols

Abstract

A low-voltage user demand response interaction apparatus and an operation method therefor. The apparatus comprises an electrical loop, a mechanical switch, a protection module, a data collection module, a control processor, a power supply module, a communication module, a load identification module, a blockchain module and a demand response module, wherein the mechanical switch is connected to the electrical loop; the protection module is connected to the mechanical switch; the control processor is connected to the protection module; the load identification module, the blockchain module and the demand response module are respectively connected to the control processor; the data collection module is connected to the electrical loop, and transmits data to the control processor; and the communication module and the power supply module are respectively connected to the control processor.

IPC Classes  ?

• H02J 3/14 - Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
• H04L 9/00 - Arrangements for secret or secure communicationsNetwork security protocols

Abstract

The present invention provides a polypropylene cable protective layer and a preparation method thereof. The polypropylene cable protective layer sequentially includes a dielectric layer, a buffer layer and an insulating layer from the inside to the outside, and the thickness of the dielectric layer accounts for 5%˜12% of the thickness of the polypropylene cable protective layer; the thickness of the buffer layer accounts for 17%˜25% of the thickness of the polypropylene cable protective layer; the dielectric layer, the buffer layer and the insulating layer are respectively obtained by the wrapping of a polypropylene film A, a polypropylene film B and a polypropylene film C. The polypropylene cable protective layer of the present invention forms a dielectric gradient, and realizes the improvement of the insulation strength and voltage level of the power cable, and the increase of the transmission capability.

IPC Classes  ?

• H01B 3/44 - Insulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances plasticsInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances resinsInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances waxes vinyl resinsInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances plasticsInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances resinsInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances waxes acrylic resins
• H01B 7/02 - Disposition of insulation

Abstract

The present disclosure provides a parameter design method for a series passive impedance adapter applicable to a VSC-HVDC transmission system, to resolve the technical problem that high-frequency resonance may occur when impedance of a VSC-HVDC transmission system is mismatched with that of a sending-end or receiving-end grid. A parameter design goal of the present disclosure is that reactive power consumed by a series passive impedance adapter is not more than A times rated power of a converter, and a loss of the series passive impedance adapter in a fundamental wave is B times the rated power of the converter. The parameter design method for a series passive impedance adapter applicable to a VSC-HVDC transmission system in the present disclosure can realize a positive impedance characteristic within a concerned frequency band and completely eliminate a risk of harmonic resonance.

IPC Classes  ?

• H02J 3/01 - Arrangements for reducing harmonics or ripples
• H02J 3/18 - Arrangements for adjusting, eliminating or compensating reactive power in networks
• H02J 3/34 - Arrangements for transfer of electric power between networks of substantially different frequency
• H02J 3/36 - Arrangements for transfer of electric power between ac networks via a high-tension dc link
• H02M 1/00 - Details of apparatus for conversion
• H02M 1/12 - Arrangements for reducing harmonics from AC input or output
• H02M 7/483 - Converters with outputs that each can have more than two voltage levels

Abstract

A current sharing control system and method for a current source type converter, relating to the technical field of new energy. A first conversion module performs dq conversion on a three-phase grid-connected voltage of a current source type modular multilevel converter, and a phase-locked loop generates a conversion phase; then, a second conversion module generates a first current signal and a second current signal according to a three-phase grid-connected current of the current source type modular multilevel converter and the conversion phase, a direct-current outer loop generates a third current signal, an alternating-current inner loop generates a second voltage signal and a third voltage signal, and a third conversion module generates a modulation signal according to the conversion phase, the second voltage signal and the third voltage signal; and finally, a second control module generates a pulse wave according to the modulation signal, a total output current actual value and a direct-current side current of a target sub-module so as to perform current sharing control on the target sub-module, thereby implementing the current sharing control of the simple and low-cost current source type modular multilevel converter.

IPC Classes  ?

• H02M 7/23 - Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only arranged for operation in parallel

Abstract

Provided are a direct-current energy consumption apparatus, a control method and device therefor, and a storage medium. The direct-current energy consumption apparatus comprises an energy consumption resistor (1), power modules (2), an inductor (3), and a control module (4); the inductor (3) is arranged on a series branch formed by connecting the energy consumption resistor (1) and the power modules (2) in series; the control module (4) is configured to switch off all the power modules (2) when detecting that the voltage at two ends of the direct-current energy consumption apparatus is greater than a first voltage threshold, and to switch on all the power modules (2) when the voltage at the two ends is less than a second voltage threshold, wherein the two voltage thresholds are set on the basis of a rated voltage of a corresponding direct-current power transmission system. By means of the addition of the inductor (3) on the branch of the direct-current energy consumption apparatus, the optimization of main loop parameters of the direct-current energy consumption apparatus, and the strategy of simultaneously switching on/off the power modules (2), the current change rate of the energy consumption resistor (1) is reduced, the impact on a direct-current bus is reduced, the use amount of capacitance can be significantly reduced, and the advantages of high performance, high reliability and low cost are achieved.

IPC Classes  ?

• H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers
• H02J 3/36 - Arrangements for transfer of electric power between ac networks via a high-tension dc link

Abstract

A method and a device for controlling grid configuration of a flexible direct current electric power transmission system, and a computer-readable storage medium are provided. The active power reference value is modified based on the frequency deviation of the alternating current grid. The reactive power reference value is modified based on the voltage deviation of the alternating current grid. The outputted active power and the outputted reactive power are controlled based on the active power reference value and the reactive power reference value, respectively. The grid voltage is further configured and controlled through power control, so that the system is capable of self-synchronization, frequency regulation and voltage regulation. In addition, the virtual synchronous machine technology is introduced into control of the reactive power, so that the system can provide inertia support for the grid voltage amplitude.

IPC Classes  ?

• H02J 3/16 - Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power

Abstract

A method, an apparatus and a device for suppressing a first HVDC commutation failure under an AC system fault are provided. The method includes: obtaining a three-phase voltage of a converter bus, and calculating a zero-sequence component amplitude and an αβ component amplitude; calculating a first trigger-angle command for a single-phase fault and a second trigger-angle command for a three-phase fault; selecting a smaller one of the first trigger angle command and the second trigger angle command as a trigger-angle command for an extinction-angle controller; and adjusting a trigger angle of the HVDC transmission system by using the trigger-angle command as an upper limit value for an output of the extinction-angle controller of the HVDC transmission system.

IPC Classes  ?

• H02J 3/36 - Arrangements for transfer of electric power between ac networks via a high-tension dc link
• H02J 3/00 - Circuit arrangements for ac mains or ac distribution networks
• H02M 7/48 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Abstract

The present application relates to a method and apparatus for identifying a scorching phenomenon of a semi-conductive shielding material of a high-voltage cable, and a computer device, a storage medium and a computer program product. The method comprises: determining an initial processing temperature of a screw extrusion device, wherein the screw extrusion device is used for performing extrusion processing on a semi-conductive shielding material to be tested; in the process of the screw extrusion device extruding said semi-conductive shielding material, after a screw torque corresponding to the screw extrusion device reaches a balance, determining a fluctuation amplitude of the screw torque; when the fluctuation amplitude of the screw torque is less than a preset fluctuation threshold value, determining the highest processing temperature of the screw extrusion device in the process of the screw extrusion device extruding said semi-conductive shielding material; and when the temperature difference between the highest processing temperature and the initial processing temperature meets a preset difference condition, determining that no scorching phenomenon occurs in said semi-conductive shielding material during an extrusion processing process. By using the method, the accuracy of identifying a scorching phenomenon of a semi-conductive shielding material can be improved.

IPC Classes  ?

• G01N 25/00 - Investigating or analysing materials by the use of thermal means

Abstract

A silicone rubber insulator shed material, and a silicone rubber insulator and a preparation method therefor and an application thereof. The components of the silicone rubber insulator shed material comprise silicone rubber, iron oxide, nano-montmorillonite, fumed silica, aluminum hydroxide, a silane coupling agent, a vulcanizing agent, and hydroxy silicone oil, wherein the iron oxide and the nano-montmorillonite can slow down the thermal oxidation decomposition of the silicone rubber, thus improving the hydrophobicity, hydrophobic mobility and hydrophobic recovery of the silicone rubber composite insulator, thereby solving the technical problem in the prior art that the aging decomposition resistance of silicone rubber needs to be improved.

IPC Classes  ?

• C08L 83/06 - Polysiloxanes containing silicon bound to oxygen-containing groups
• C08K 3/34 - Silicon-containing compounds
• C08L 83/04 - Polysiloxanes
• C08K 13/02 - Organic and inorganic ingredients
• C08K 3/36 - Silica

Abstract

aaSaXSS.

IPC Classes  ?

• G01N 3/24 - Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
• G01N 3/04 - Chucks
• G01N 11/10 - Investigating flow properties of materials, e.g. viscosity or plasticityAnalysing materials by determining flow properties by moving a body within the material
• G01N 1/36 - Embedding or analogous mounting of samples

Abstract

A heat dissipation apparatus used in a gas-liquid mixed medium and a preparation method therefor, relating to the field of heat dissipation. The heat dissipation apparatus comprises a heat dissipation plate and a plurality of supporting structures. One side of the heat dissipation plate in the vertical direction is in contact with a heat source; the plurality of supporting structures are provided on the side of the heat dissipation plate opposite to the heat source; the plurality of supporting structures are evenly arranged in the horizontal direction of the heat dissipation plate, and the area of each supporting structure in the horizontal direction is equal; the areas of the plurality of supporting structures gradually increase from top to bottom in the vertical direction; and the heat dissipation plate, the supporting structures and the heat source are all located in a gas-liquid mixed medium. By reasonably setting the positions and sizes of the supporting structures, the heat dissipation areas of different regions can be accurately controlled, thereby improving the pressure distribution consistency and heat dissipation uniformity of the heat dissipation apparatus.

IPC Classes  ?

• H01L 23/367 - Cooling facilitated by shape of device
• H01L 21/48 - Manufacture or treatment of parts, e.g. containers, prior to assembly of the devices, using processes not provided for in a single one of the groups or
• H01L 23/427 - Cooling by change of state, e.g. use of heat pipes
• H01L 23/473 - Arrangements for cooling, heating, ventilating or temperature compensation involving the transfer of heat by flowing fluids by flowing liquids

Abstract

The present application relates to a temperature measurement method and device for submarine cable factory joints. The method comprises: obtaining measured temperature values of key reference areas of a reference submarine cable factory joint, wherein the main body structure of the reference submarine cable factory joint is the same as that of a target submarine cable factory joint, the environment where the reference submarine cable factory joint is located is the same as the environment where the target submarine cable factory joint is located, and the reference submarine cable factory joint and the target submarine cable factory joint are spaced apart from each other by a preset distance and then placed side by side (S201); and determining the measured temperature values of the key reference areas as measured temperature values of corresponding key measurement areas in the target submarine cable factory joint (S202).

IPC Classes  ?

• G01K 7/02 - Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat using thermoelectric elements, e.g. thermocouples
• G01K 7/16 - Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat using resistive elements
• G01K 11/32 - Measuring temperature based on physical or chemical changes not covered by group , , , or using changes in transmittance, scattering or luminescence in optical fibres
• H01R 43/16 - Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for manufacturing contact members, e.g. by punching and by bending

Abstract

An antioxidant addition device for a 500 kV cross-linked polyethylene insulating material, comprising: a heating hopper module and a heat insulation pipeline module, the heating hopper module comprising a feeding port, a heating jacket, a material bin and a filter screen, and the heat insulation pipeline module comprising a liquid metering pump, a stainless steel liquid pipe and a discharging port. An antioxidant is added into the material bin via the feeding port, and is heated in the material bin by means of the heating jacket to form a liquid-phase antioxidant; then same is filtered by means of the filter screen, is metered by the liquid metering pump and then enters the stainless steel liquid pipe; and finally via the discharging port, same is put into use. The liquid-phase addition mode enables the antioxidant and polyethylene resin to be fully mixed, thereby avoiding non-uniform material particles and uneven insulation performance caused by inaccurate addition of solid materials. In addition, raw materials are metered by using high-precision devices, such that the proportion of a produced cross-linked polyethylene material better follows a design formula. Therefore, the flexibility of selecting additives during formula designing processes of cross-linked polyethylene insulating materials is improved.

IPC Classes  ?

• B29C 48/29 - Feeding the extrusion material to the extruder in liquid form
• B29C 48/92 - Measuring, controlling or regulating
• B29B 13/10 - Conditioning or physical treatment of the material to be shaped by grinding, e.g. by trituratingConditioning or physical treatment of the material to be shaped by sievingConditioning or physical treatment of the material to be shaped by filtering

Abstract

A TEE-based smart home remote control method and a related apparatus, which relate to the technical field of smart homes. The method comprises: when a TEE is enabled, performing a user legitimacy check by means of a user terminal and according to preset login information and login information which is stored in the TEE; if the user legitimacy check is passed, sending to a remote sensor a randomly generated timestamp and identity verification information by means of the user terminal; respectively performing, by means of the remote sensor, replay attack verification and identity legitimacy verification according to the timestamp and the identity verification information, and if the two instances of verification are passed, generating a first shared key, and sending verification success information to the user terminal; and after the verification success information is received, generating a second shared key by means of the user terminal, and performing instruction interaction control with the remote sensor on the basis of the first shared key and the second shared key. The present application solves the technical problem whereby existing smart home remote control technology cannot meet the requirements for both attack resistance and high efficiency.

IPC Classes  ?

• G05B 15/02 - Systems controlled by a computer electric
• H04L 9/40 - Network security protocols

Abstract

A method for detecting abnormal direct current voltage measurement in a modular multilevel converter high voltage direct current transmission system is provided. In the method, a valve group voltage at a detection pole is obtained, voltages at voltage measurement points at the detection pole are collected, and comparison and determination are performed based on the actual arrangement of the voltage measurement points, and then whether an abnormal measurement occurs at each of the voltage measurement points is determined.

IPC Classes  ?

• H02H 7/26 - Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occurred
• G01R 31/08 - Locating faults in cables, transmission lines, or networks
• H02J 3/36 - Arrangements for transfer of electric power between ac networks via a high-tension dc link

Abstract

An insulating device used in a gas-liquid mixed medium, which belongs to the field of high-voltage insulation. The insulating device comprises a first insulator section, a second insulator section and a third insulator section, wherein the first insulator section and the second insulator section are both in the shape of a circular truncated cone; the third insulator section is cylindrical; an upper bottom face of the first insulator section is connected to a high-potential metal body, and a lower bottom face thereof is fixed to a lower bottom face of the second insulator section; one bottom face of the third insulator section is connected to a low-potential metal body, and the other bottom face thereof is fixed to an upper bottom face of the second insulator section; and a side face of the first insulator section, a side face of the second insulator section and a side face of the third insulator section are each in the shape of a sine function curve in an axial direction. The problem of a reduction in the insulation performance caused by accumulation of a gas-liquid mixed medium on a surface of the insulating device is avoided, thereby improving the insulation performance of the insulating device in the gas-liquid mixed medium.

IPC Classes  ?

• H01B 17/48 - Means for obtaining improved distribution of voltageProtection against arc discharges over chains or other serially-arranged insulators
• H01B 17/00 - Insulators or insulating bodies characterised by their form

Abstract

1222 (step 7); and the controller adjusts process parameters of the melt extrusion system, adjusts the shear viscosity η to obtain an adjusted shear viscosity η', and causes η' to be within a suitable processing viscosity interval of the melt (step 8).

IPC Classes  ?

• B29B 9/06 - Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
• B29C 48/00 - Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired formApparatus therefor
• B29C 48/32 - Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles

Abstract

The present disclosure relates to a cable semi-conductive shielding material made of ionic liquid modified conductive carbon black, comprising a base material, conductive carbon black, a cross-linking agent, an antioxidant, a lubricant, and an ionic liquid. The parts by weight of the components are as follows: 58-64 parts of the base material, 27-35 parts of the conductive carbon black, 1-5 parts of the ionic liquid, 1-2 parts of the lubricant, 0.3-0.7 parts of the antioxidant, and 0.4-2.2 parts of the cross-linking agent.

IPC Classes  ?

• C08L 23/08 - Copolymers of ethene
• C08K 3/04 - Carbon
• C08K 9/06 - Ingredients treated with organic substances with silicon-containing compounds

Abstract

The present application relates to a formula design and optimization method for an XLPE insulating material of a high-voltage alternating-current cable, comprising the following steps: Step 1, determining initial formula elements, comprising types of base resins, antioxidants and cross-linking agents; Step 2, testing a sample prepared by performing hot press molding on a pure base resin, and preferably selecting on the basis of a qualitative evaluation index I and a quantitative evaluation index I sequentially to obtain a preferred base resin; Step 3, preparing a plurality of groups of cross-linking agent/antioxidant/base resin blends, and preferably selecting on the basis of a qualitative evaluation index II and a quantitative evaluation index II sequentially to obtain an optimized cross-linking agent formula; Step 4, preparing a plurality of groups of cross-linking agent/antioxidant/base resin blends, and preferably selecting on the basis of a qualitative evaluation index III and a quantitative evaluation index III sequentially to obtain an optimized antioxidant formula; and Step 5, verifying electrical performance, and when test result parameters all satisfy requirements, taking the material formula as an optimized formula, or otherwise returning to test alternative materials under test.

IPC Classes  ?

• G01D 21/02 - Measuring two or more variables by means not covered by a single other subclass

Abstract

The present disclosure relates to a peel strength-improved semi-conductive shielding material, a preparation method, an article, and a cable. The peel strength-improved semi-conductive shielding material is prepared from the following raw materials in parts by mass: 58-68 parts of a matrix resin, 27-34 parts of conductive carbon black, 1-5 parts of maleic anhydride grafted polyethylene, and 0.4-2.2 parts of a cross-linking agent. Low-density polyethylene resin and ethylene-acrylic resin in the matrix resin have good interfacial compatibility under the proportioning of the raw materials, and the conductive carbon black has good dispersibility in the resin. When the semi-conductive shielding material is used in a cable for preparing a semi-conductive shielding layer, the adhesive force between the semi-conductive shielding layer and an insulating layer can be effectively increased, the peel strength between the semi-conductive shielding layer and the insulating layer is improved, and the service life of the cable is prolonged.

IPC Classes  ?

• C08L 51/06 - Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bondsCompositions of derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
• H01B 7/17 - Protection against damage caused by external factors, e.g. sheaths or armouring
• H01B 7/18 - Protection against damage caused by external factors, e.g. sheaths or armouring by wear, mechanical force or pressure
• C08K 3/04 - Carbon
• C08K 5/14 - Peroxides
• C08L 23/06 - Polyethene
• C08L 23/08 - Copolymers of ethene

Abstract

A photoacoustic spectrometry-based gas testing apparatus, provided with a laser emitting assembly, a first photoacoustic cell, an acoustic signal detection assembly, a signal amplification assembly, a phase detection assembly and a visible light emitting assembly. An output end of the laser emitting assembly is aligned with an incident end of the first photoacoustic cell. The sound signal detection assembly is accommodated in the first photoacoustic cell, and an output end of the sound signal detection assembly is connected to an input end of the signal amplification assembly. An output end of the signal amplification assembly is connected to an input end of the phase detection assembly. An output end of the phase detection assembly is connected to the laser emitting assembly. The visible light emitting assembly is used for emitting visible light to an emergent end of the first photoacoustic cell. The visible light emitting assembly emits visible light to the emergent end of the first photoacoustic cell; after transmitting through the first photoacoustic cell, the visible light is propagated to the laser emitting assembly to form a calibration light path; and the positions of the laser emitting assembly and the first photoacoustic cell are adjusted according to the calibration light path, thus achieving calibration of a testing light path.

IPC Classes  ?

• G01N 21/17 - Systems in which incident light is modified in accordance with the properties of the material investigated
• G01N 21/3504 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
• G01N 21/39 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
• G01N 21/01 - Arrangements or apparatus for facilitating the optical investigation

Abstract

The present application relates to a design and optimization method and system for a high-voltage alternating-current cable semi-conductive shielding material formula. Said method comprises: acquiring a high-voltage alternating-current cable semi-conductive shielding material formula, comprising the types of matrix resins, conductive carbon black, dispersing agents, lubricants, antioxidants and cross-linking agents (step 1); obtaining a target matrix resin by means of a type analysis index I (step 2); obtaining target conductive carbon black by means of a type analysis index II and a usage amount analysis index II (step 3); preparing a plurality of groups of blends of the matrix resins, the conductive carbon black, the dispersing agents, coupling agents, the lubricants, the antioxidants and the cross-linking agents, and performing selection by means of a type analysis index III and a usage amount analysis index III (step 4); preparing a plurality of groups of blends of the matrix resins, the conductive carbon black, the dispersing agents, the lubricants, the antioxidants and the cross-linking agents, and performing selection by means of a type analysis index IV and a usage amount analysis index IV (step 5); and performing formula performance verification on an obtained material formula, so as to obtain an optimized formula or perform selection again (step 6).

IPC Classes  ?

• G01D 21/02 - Measuring two or more variables by means not covered by a single other subclass
• C08L 23/08 - Copolymers of ethene

Abstract

A semi-conductive shielding material based on a compound resin. Raw materials for the preparation of the semi-conductive shielding material comprise the following components in parts by mass: 55-65 parts of a compound resin, 20-30 parts of a conductive filler, and 0.9-2 parts of a cross-linking agent, wherein the compound resin is formed by compounding a low-density polyethylene resin and an ethylene-acrylic resin, and the ethylene-acrylic resin is at least one of an ethylene-ethyl acrylate resin and an ethylene-butyl acrylate resin.

IPC Classes  ?

• C08L 23/08 - Copolymers of ethene
• C08L 23/06 - Polyethene
• C08K 3/04 - Carbon
• C08K 5/14 - Peroxides

Abstract

A method for evaluating the scorching resistance of a crosslinkable polyethylene insulating material used for an electrical cable. The method comprises: obtaining a target parameter value of a crosslinkable polyethylene insulating material containing a same amount of antioxidant, wherein the target parameter value comprises the actual measured value of a number average molecular weight; based on the actual measured value of a number average molecular weight and a preset parameter value, obtaining a first comparison result, wherein the preset parameter value comprises a preset value of a number average molecular weight and a preset value of a polydispersity coefficient; and based on the first comparison result, evaluating the scorching resistance of the crosslinkable polyethylene insulating material. The method for evaluating the scorching resistance of the crosslinkable polyethylene insulating material used for an electrical cable can avoid to a certain extent a pre-crosslinking phenomenon from occurring in the production process of the crosslinkable polyethylene insulating material, thereby improving production efficiency.

IPC Classes  ?

• G01N 30/02 - Column chromatography
• G01N 30/06 - Preparation
• G01N 30/04 - Preparation or injection of sample to be analysed

Abstract

A reliability evaluation method and apparatus for a shared tower base station power supply system. The method comprises: determining whether the power supply mode of a base station power supply system is a direct mains-electricity supply mode; if not, analyzing an external power supply line of the base station power supply system, the voltage of the external power supply line, the average number of faults per month, a fault duration and a remote power supply distance, and determining whether a first-stage DC-DC power supply is installed, to obtain a reliability level; and if yes, analyzing whether a special transformer and an uninterrupted power supply are installed on the base station power supply system, and calculating the residual capacity of a storage battery after a preset operation duration, to obtain a reliability level, so as to determine whether the base station power supply system is reliable. In this way, by analyzing various reliability influence factors of the base station power supply system, the reliability of the base station power supply system is effectively evaluated, and the risk of power failure of the base station power supply system can be accurately analyzed, such that the operation safety of the base station power supply system can be improved, and stable operation of the base station power supply system is guaranteed.

IPC Classes  ?

• G06Q 10/06 - Resources, workflows, human or project managementEnterprise or organisation planningEnterprise or organisation modelling

Abstract

The present application relates to a shielding material based on carbon nanofiber modification, which shielding material is prepared from the following components, in parts by mass: 55-65 parts of a base resin, 20-30 parts of conductive carbon black, 1-10 parts of carbon nanofibers, 0.5-2 parts of a dispersant, 3-6 parts of a functional auxiliary agent and 0.9-2 parts of a cross-linking agent.

IPC Classes  ?

• C08L 23/08 - Copolymers of ethene
• C08K 3/04 - Carbon
• C08K 7/06 - Elements

Abstract

A method for evaluating the lightning protection performance of a shared tower. The method comprises: acquiring an information set corresponding to a shared tower, wherein the shared tower comprises a communication base station and an electric pole and tower, and the information set comprises a grounding mode of a shared tower grounding grid, the relative position between the communication base station and the electric pole and tower in the shared tower, the soil resistivity at the position where the shared tower is located, and the grounding resistance of the shared tower; and evaluating the lightning protection performance of the shared tower according to the information set. On this basis, the method can accurately complete the evaluation of the lightning protection performance of the shared tower by means of the comprehensive consideration of information such as the grounding mode of the shared tower grounding grid, the relative position between the communication base station and the electric pole and tower in the shared tower, the soil resistivity at the position where the shared tower is located, and the grounding resistance of the shared tower.

IPC Classes  ?

• G06F 30/20 - Design optimisation, verification or simulation

Abstract

An insulation aging life prediction method, apparatus and device for a high-voltage submarine cable. The method comprises: acquiring environment data and cable breakdown time of a cable sample, wherein the environment data comprises an electric field, temperature and mechanical stress, which are applied to the cable sample by an environment (S100); according to the cable breakdown time of the cable sample, calculating, by means of Weibull distribution, a feature breakdown time corresponding to the cable sample (S200); establishing an insulation aging life prediction model of a high-voltage submarine cable by means of the environment data and the feature breakdown time of the cable sample (S300); and acquiring environment data, in an actual application environment, of a cable to be subjected to prediction, and calculating the insulation aging life of said cable by means of the prediction model (S400).

IPC Classes  ?

• G01R 31/08 - Locating faults in cables, transmission lines, or networks
• G01R 31/12 - Testing dielectric strength or breakdown voltage
• G06Q 10/04 - Forecasting or optimisation specially adapted for administrative or management purposes, e.g. linear programming or "cutting stock problem"
• G06F 30/20 - Design optimisation, verification or simulation

Abstract

A transformer health state assessment method, apparatus, and device, and a readable storage medium. The method comprises: acquiring, in real time, a one-dimensional time domain vibration signal of a transformer to be tested (S101); converting the one-dimensional time domain vibration signal of the transformer to be tested into a first two-dimensional time-frequency domain distribution map (S102); preprocessing the first two-dimensional time-frequency domain distribution map to obtain a target two-dimensional time-frequency domain distribution map (S103); and inputting the target two-dimensional time-frequency domain distribution map into a preset multi-channel prediction model for prediction, so as to obtain a health state of the transformer to be tested (S104). When the transformer starts aging, the vibration signal of the transformer generally shows a non-stationary characteristic, and all degradation information of the transformer cannot be extracted only by means of time domain analysis, however, the preset multi-channel prediction model is used for analyzing the two-dimensional time-frequency domain distribution map of the transformer to be tested, so that the health state of the transformer to be tested can be acquired. Therefore, the operation and maintenance level and the maintenance efficiency of the transformer can be improved, and the fault probability of the transformer is reduced.

IPC Classes  ?

• G06Q 10/04 - Forecasting or optimisation specially adapted for administrative or management purposes, e.g. linear programming or "cutting stock problem"
• G06Q 10/00 - AdministrationManagement
• G06Q 50/06 - Energy or water supply
• G06K 9/00 - Methods or arrangements for reading or recognising printed or written characters or for recognising patterns, e.g. fingerprints
• G06K 9/62 - Methods or arrangements for recognition using electronic means
• G06N 3/04 - Architecture, e.g. interconnection topology
• G06N 3/08 - Learning methods

Abstract

A frequency response check method and system for a common-path optical fiber ultrasonic sensing system. The method comprises: building a partial discharge sound simulation platform, which is used for checking a frequency response of a common-path optical fiber ultrasonic sensing system, wherein the partial discharge sound simulation platform comprises a reference sensing system and the common-path optical fiber ultrasonic sensing system, and the reference sensing system is a piezoelectric ceramic sensing system (101); acquiring voltages, which are applied to sound sources of the reference sensing system and the common-path optical fiber ultrasonic sensing system under a unit signal-to-noise ratio, so as to obtain a first voltage corresponding to the reference sensing system and a second voltage corresponding to the common-path optical fiber ultrasonic sensing system (102); and according to the first voltage, the second voltage and a frequency response of the reference sensing system, calculating the frequency response of the common-path optical fiber ultrasonic sensing system according to a preset formula (103).

IPC Classes  ?

• G01R 31/12 - Testing dielectric strength or breakdown voltage
• G01H 9/00 - Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means

Abstract

A method, apparatus and system for monitoring the earthing resistance of an earthing pole, and a medium. In the solution provided in the present application, during monopole earth operation, a direct-current project is used to obtain the voltage of a direct-current neutral bus of a converter station and a monopole earth operation current, and the impact of a temperature rise on the resistance of an earthing pole line is also taken into consideration to deduct the line resistance of the earthing pole line, such that a final earthing resistance is obtained; and no auxiliary pole needs to be provided at a far end of an earthing pole, and an obtained earthing resistance result is then transmitted back to a back-end monitoring center, such that remote monitoring over the earthing resistance of the earthing pole can be realized, thereby solving the technical problem in the prior art of it being difficult to realize online monitoring over the earthing resistance of an earthing pole after a direct-current project is put into use.

IPC Classes  ?

• G01R 27/20 - Measuring earth resistanceMeasuring contact resistance of earth connections, e.g. plates

Abstract

A photoacoustic cell for photoacoustic spectroscopy detection. A resonant chamber (3) is transversely provided at the tops of a first buffer chamber (1) and a second buffer chamber (7) which are vertically arranged in parallel, and the interiors of the resonant chamber (3), the first buffer chamber (1), and the second buffer chamber (7) are communicated, so that the resonant chamber (3) and the two buffer chambers form a Π-shaped structure; when infrared light passes through a first optical window piece (2) and a second optical window piece (8), the first optical window piece (2) and the second optical window piece (8) can generate a light scattering phenomenon to cause noise; because an included angle of 45° is formed between the first optical window piece (2) and a horizontal direction, and an included angle of 135° is formed between the second optical window piece (8) and the horizontal direction, reflected light can be as perpendicular as possible to the resonant chamber (3) to enter the first buffer chamber (1) and the second buffer chamber (7), thereby greatly reducing the window noise, improving the detection sensitivity, and solving the technical problem that the sensitivity of photoacoustic spectroscopy detection of a trace gas is reduced due to relatively large noise signals at windows of existing photoacoustic cells.

IPC Classes  ?

• G01N 21/01 - Arrangements or apparatus for facilitating the optical investigation
• G01N 21/03 - Cuvette constructions
• G01N 21/17 - Systems in which incident light is modified in accordance with the properties of the material investigated

Abstract

An electromagnetic transient modeling method and system for a high-efficiency synchronous machine, and, a device. The method comprises: predicting, of a synchronous machine, a first rotor angular velocity, a first rotor angle, and a first current q component of and a first current d component of an armature current, establishing a first Norton circuit for simulating the synchronous machine, and solving at the same time a second Norton circuit after equivalent transformation and a network conductance matrix so as to obtain a three-phase voltage of a synchronous machine port; according to the three-phase voltage, obtaining a second current q component, a second current d component, a second rotor angular velocity and a second rotor angle; and by means of error-controlled iterative solving, determining an electromagnetic transient simulation calculation result of the synchronous machine. Rotation potential historical amounts and current amounts of a synchronous machine are avoided, so that the precision of a simulation calculation result is improved; and the calculation result can maintain the calculation efficiency of a dq0 model while achieving the precision of a phase domain model. Therefore, the method is suitable for use in power system electromagnetic transient simulation in practical engineering calculation.

IPC Classes  ?

• H02P 21/14 - Estimation or adaptation of machine parameters, e.g. flux, current or voltage

Abstract

A saturation effect-based synchronous machine electromagnetic transient modeling method, system and device. In the method, by predicting a first rotor angular velocity, a first rotor angle, a first current q component, a first current d component, a first flux linkage turning point d component, a first flux linkage turning point q component and flux linkage turning data of a synchronous machine, analysis processing is performed to obtain a corresponding second current q component, second current d component, second rotor angular velocity, second rotor angle, stator flux linkage d component and stator flux linkage q component. Thus, a historical amount and a current amount of a rotational potential of the synchronous machine are avoided, and the precision of a simulation calculation result is improved, the calculation result keeping the calculation efficiency of a dq0 model while achieving the precision of a phase-domain model, such that the method has high simulation precision and high calculation efficiency. The saturation effect-based synchronous machine electromagnetic transient modeling method can be suitable for development of electromagnetic transient simulation software of a power system for practical engineering calculation.

IPC Classes  ?

• H02J 3/00 - Circuit arrangements for ac mains or ac distribution networks
• H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers
• G06F 17/11 - Complex mathematical operations for solving equations
• G06F 17/16 - Matrix or vector computation

Abstract

A method and structure for connecting a diversion center terminal support of a grounding electrode to a drain cable. In the present invention, with regard to a grounding electrode for which a diversion center terminal support is connected to a drain cable by means of a main cable, stripping is performed layer by layer from an outer protection layer to an inner insulation layer at one end of the main cable, such that a step-shaped section is formed; and a conductor layer exposed at the step-shaped section is connected to a metal connecting plate that is connected to the drain cable, and the other end of the main cable is connected to the diversion center terminal support. By means of the present invention, the structure for connecting the diversion center terminal support of the grounding electrode to the drain cable is improved, the direct surface insulation capability of an armor layer and the main cable is improved, and the problem of circulating currents in the armor layer of the main cable of the grounding electrode is effectively solved.

IPC Classes  ?

• H01R 43/28 - Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for wire processing before connecting to contact members, not provided for in groups

Abstract

A pulse width modulation power supply method, and an electronic high-voltage energy extraction and sampling apparatus and method. The apparatus uses a high-voltage energy extraction module composed of a high voltage-side element and a low voltage-side element, so that the electronic high-voltage energy extraction and sampling apparatus can achieve the purpose of high-efficiency voltage energy extraction, and implement the characteristics of high power factor and high conversion efficiency. A waveform characteristic of a voltage of a high-voltage power supply is indirectly reflected by means of a current in the low voltage-side element of a low-voltage arm, so that the purpose of monitoring the voltage of the high-voltage power supply is achieved. The electronic high-voltage energy extraction and sampling apparatus has a simple circuit structure, and also has a small volume, enabling the electronic high-voltage energy extraction and sampling apparatus to be used in a scenario involving a narrow space, and the electronic high-voltage energy extraction and sampling apparatus can meet the requirements of both high-voltage energy extraction and voltage monitoring, thereby solving the technical problems of existing high-voltage energy extraction elements having low power factors, low conversion efficiency, complex circuit structures and large volumes.

IPC Classes  ?

• H02M 7/06 - Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
• H02M 3/156 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators

Abstract

The present application relates to a liquid phase impregnation-based reinforcement method and device for a repair interface of a flexible joint of a high-voltage cable. The method comprises the following steps: step 1, forming a surface of a reversed stress cone; step 2, wrapping the surface of the reversed stress cone with dust-free cloth, heating the outer side of the dust-free cloth, and treating the surface of the reversed stress cone using a liquid-phase impregnation method; step 3, preheating a joint, subjecting an insulation-restored cross-linked polyethylene material to extrusion molding or lapping, and cross-linking restored insulation in a preset temperature range and a preset pressure range; and step 4, polishing the surface of the restored insulation, manufacturing a stress cone, and restoring an outer shielding layer.

IPC Classes  ?

• H02G 15/08 - Cable junctions
• H02G 1/16 - Methods or apparatus specially adapted for installing, maintaining, repairing, or dismantling electric cables or lines for repairing insulation or armouring of cables

Abstract

A horn-shaped photoacoustic cell for photoacoustic spectroscopy gas detection. The horn-shaped photoacoustic cell of the present invention comprises a photoacoustic cell housing, an air inlet, an air outlet, horn-shaped buffer cavities, a resonant cavity, a sound sensor, a light inlet and a light outlet. Two horn-shaped buffer cavities arranged symmetrically with respect to the longitudinal symmetry axis of the photoacoustic cell housing are provided in the photoacoustic cell housing; the central axis of each horn-shaped buffer cavity and the transverse symmetry axis of the photoacoustic cell are located on the same straight line; the horn-shaped buffer cavity on one side is connected to the air inlet; the horn-shaped buffer cavity on the other side is connected to the air outlet; the resonant cavity is communicated between the two horn-shaped buffer cavities; the sound sensor is close to the resonant cavity; and the light inlet and the light outlet are respectively formed at two ends of the photoacoustic cell housing. According to the present invention, the structure of a resonant photoacoustic cell is optimized, the horn-shaped photoacoustic cell is designed, and through experimental tests, the sensitivity of the horn-shaped photoacoustic cell is higher than the sensitivity of existing cylindrical, T-shaped and H-shaped resonant photoacoustic cells.

IPC Classes  ?

• G01N 21/17 - Systems in which incident light is modified in accordance with the properties of the material investigated
• G01N 21/03 - Cuvette constructions

Abstract

An online monitoring system and method for hydraulic oil of a power aerial work vehicle, and a device. A microprocessor receives a monitoring instruction, and the microprocessor sends an oil extraction signal to a gear pump; then, the gear pump is started after responding to the oil extraction signal, extracts hydraulic oil from a hydraulic oil tank, and conveys same to the hydraulic oil tank by means of a pipeline, wherein the hydraulic oil in the hydraulic oil tank is cyclically extracted; a detection module detects the hydraulic oil in the pipeline in real time, generates oil quality parameters and sends the oil quality parameters to the microprocessor; and the microprocessor compares the received oil quality parameters with preset parameter threshold values, and finally generates oil quality state information and displays same. By means of a microprocessor, a gear pump and a detection module, online monitoring can be performed on the oil quality state of hydraulic oil in real time, oil quality state information is fed back in real time, and whether to replace or filter the hydraulic oil can be determined according to the displayed oil quality state information, so as to maintain the hydraulic oil in a healthy state, and avoid a fault caused by the deterioration of the oil quality state.

IPC Classes  ?

• F15B 19/00 - Testing fluid-pressure actuator systems or apparatus, so far as not provided for elsewhere

Abstract

A lattice-based proxy signature method, apparatus and device, a lattice-based proxy signature verification method, apparatus and device, and a storage medium. Polynomials are randomly selected in rings to calculate public and private keys of nodes, and the magnitudes of proxy public and private keys are the same as the magnitudes of public and private keys of an original signer. Therefore, compared with existing proxy signature schemes, the present application has smaller lengths of public and private keys and higher storage efficiency. Proxy signature information generated in the present application shows a signature of the original signer and also shows a signature of a proxy signer. Once a proxy signature is created, the proxy signature cannot be repudiated by the proxy signer, and has strong non-repudiation and strong unforgeability. The proxy signature method has the advantage of resisting quantum computer attack.

IPC Classes  ?

• H04L 9/32 - Arrangements for secret or secure communicationsNetwork security protocols including means for verifying the identity or authority of a user of the system

Abstract

vivivi to obtain promise value tuples c ̃ and x ̃; signing the promise value tuple c ̃ by means of ESDSA to obtain a signature tuple s ̃; and, on the basis of the promise value tuple c ̃, the signature tuple s ̃, and the signature tuple d ̃ of the other voters, constructing a voting tuple (c ̃,s ̃,d ̃) and putting the voting tuple (c ̃,s ̃,d ̃) and the promise value tuple x ̃ on-chain, the voting tuple (c ̃,s ̃,d ̃) being used as voting content of a voting stage, wherein the signature tuple d ̃ is generated after the other voters verify the signature tuple s ̃ and the verification is passed, and the promise value tuple x ̃ is used for decrypting the voting tuple. By means of the processes, the voting content is hidden and voting is anonymous and verifiable.

IPC Classes  ?

• H04L 9/32 - Arrangements for secret or secure communicationsNetwork security protocols including means for verifying the identity or authority of a user of the system
• G07C 13/00 - Voting apparatus

Abstract

A timestamp generation method and apparatus, and an electronic device and a storage medium, which are used for solving the technical problem of recorded information being easily leaked because a trusted third party is usually needed as a timestamp authority for recording in a traditional trusted timestamp generation method. In the present invention, the method comprises: acquiring a file record; calculating a hash value of the file record; sending the hash value to a random issuer, and receiving a signature result returned by the random issuer, wherein the signature result is generated after the random issuer signs the hash value and a receiving time, and the receiving time is the time when the random issuer receives the hash value; and storing the signature result in a blockchain as a timestamp of the file record.

IPC Classes  ?

• H04L 9/32 - Arrangements for secret or secure communicationsNetwork security protocols including means for verifying the identity or authority of a user of the system

Abstract

A cross-linked polyethylene cable insulation material reliability prediction method comprises the following steps: step 1, carrying out cross-linking reaction on a plurality of groups of crosslinkable materials, so as to obtain a plurality of groups of cross-linked polyethylene and enthalpy values of the plurality of groups of crosslinkable materials at exothermic peaks of the crosslinking reaction; step 2, carrying out a thermal extension experiment on the plurality of groups of cross-linked polyethylene, so as to obtain load elongations of the plurality of groups of cross-linked polyethylene; step 3, on the basis of the enthalpy values of the plurality of groups of crosslinkable materials at the exothermic peaks of the crosslinking reaction and the load elongations of the plurality of groups of cross-linked polyethylene, establishing a cross-linked polyethylene cable insulation material reliability prediction curve; step 4, carrying out cross-linking reaction on a crosslinkable material to be predicted, so as to obtain an enthalpy value of said crosslinkable material at an exothermic peak of the crosslinking reaction; and step 5, comparing the enthalpy value of said crosslinkable material at the exothermic peak of the crosslinking reaction and a standard enthalpy value, the crosslinkable material being a cross-linking agent and polyethylene.

IPC Classes  ?

• G01N 25/48 - Investigating or analysing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on solution, sorption, or a chemical reaction not involving combustion or catalytic oxidation

Abstract

A low-voltage user intelligent interaction response exchange system, comprising a power distribution network and system master station, an intelligent electric meter, a mobile phone APP, an intelligent exchange terminal, an intelligent gateway and a low-voltage user load. In the present disclosure, during a process in which a low-voltage user participates in a demand response, the power distribution network and system master station issues in the mobile phone APP a demand response plan and a notification, the low-voltage user acquires the demand response plan and the notification by means of the mobile phone APP and accesses the intelligent exchange terminal by means of the mobile phone APP, and the load is turned on or turned off by means of the intelligent gateway, thereby completing a demand response task. The convenience for a low-voltage user to participate in a demand response policy is improved and the participation can be completed simply by means of the mobile phone APP, and a low-voltage user failing to realize demand response and even causing an electrical accident due to a misoperation is avoided.

IPC Classes  ?

• H02J 13/00 - Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the networkCircuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
• H04L 12/28 - Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
• H04B 3/54 - Systems for transmission via power distribution lines

Abstract

A low-voltage user demand response interaction apparatus and an operation method therefor. The apparatus comprises an electrical loop, a mechanical switch, a protection module, a data collection module, a control processor, a power supply module, a communication module, a load identification module, a blockchain module and a demand response module, wherein the mechanical switch is connected to the electrical loop; the protection module is connected to the mechanical switch; the control processor is connected to the protection module; the load identification module, the blockchain module and the demand response module are respectively connected to the control processor; the data collection module is connected to the electrical loop, and transmits data to the control processor; and the communication module and the power supply module are respectively connected to the control processor. The low-voltage user demand response interaction apparatus provided in the present disclosure has the advantages of being small in size and being intelligent. An effective channel is provided for a low-voltage user to participate in demand response, and the safety and reliability of demand response service data are ensured.

IPC Classes  ?

• H02J 3/14 - Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading

Abstract

Disclosed are a passive triggered-power electronic tap-changer device and a contact device. The power electronic tap-changer device comprises: two taps, a main contact, two auxiliary contacts, two trigger contacts, an output terminal, two thyristors, and four voltage divider resistors, which can achieve the passive triggering of a power electronic switch by means of controlling the auxiliary contacts and the trigger contacts. Provided in the present invention is a contact device for the passive triggered-power electronic tap-changer, comprising: at least two stationary contacts, a main contact, two thyristor trigger contacts, two thyristor auxiliary contacts, and a drive shaft, wherein the main contact, the thyristor trigger contacts, and the thyristor auxiliary contacts are fixed to the drive shaft, the contact device can switch the power electronic switch to different stationary contacts by means of controlling the rotation of the drive shaft, and maintains the switching time sequence of passive triggering.

IPC Classes  ?

• H01H 9/00 - Details of switching devices, not covered by groups
• H01H 19/12 - Contact arrangements for providing make-before-break operation, e.g. for on-load tap-changing

Abstract

A DC voltage measurement anomaly detection method for a VSC-HVDC system, comprising: obtaining the valve group voltage of a detection pole, collecting the voltage value of each voltage measurement point of the detection pole, performing comparative judgment according to the actual arrangement condition of the voltage measurement points, and determining the anomaly of each voltage measurement point. According to the actual structure of the VSC-HVDC system, the problem of abnormal measurement of voltage measurement points is solved in a measurement point replacement mode, and the problem in the prior art of mainly focusing on a conventional DC voltage measurement abnormal fault positioning method and a rapid diagnosis method is solved. The method is not suitable for the technical problem of single measurement abnormity detection of the VSC-HVDC system.

IPC Classes  ?

• H02H 7/26 - Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occurred

Abstract

An air-cooled cooling garment, comprising a breathable bottom plate (1), a breathable shell (2), a power supply, a fan (3) and buckling devices (4). The breathable bottom plate (1) is a 3D material bottom plate; the 3D material bottom plate is uniformly distributed in the breathable shell (2); bottom plate recesses are symmetrically formed in the left side and the right side of the breathable bottom plate (1) for placing fans (3); fan openings (31) are formed in the positions of the outer side of the breathable shell (2) corresponding to the bottom plate recesses, and are used for air suction of the fans (3); the fans (3) are fixedly connected to the breathable shell (2) around the fan openings (31); the power supply and the fans (3) are integrally designed; the buckling devices (4) are fixedly connected to the breathable shell (2) for fixing the cooling garment onto a human body. The cooling garment generates a uniformly diffused mild airflow on the surface of a human body, heat on the surface of the human body is taken away by means of the airflow, so that the effect of effectively cooling a human body is achieved, and the cooling garment is light in weight and uniform in weight distribution, so that the wearing comfort is improved in multiple aspects.

IPC Classes  ?

• A41D 13/005 - Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches with controlled internal environment with controlled temperature

Abstract

Disclosed are a voltage source converter based high voltage direct current (VSC-HVDC) high-frequency resonance suppression method, system, and device. The method includes: when an effective value of an actually input alternating current (AC) voltage is reduced from a normal value to meet a preset condition, making the virtual electrical quantity completely equal to the actual electrical quantity, and performing full real-time tracking for the actual electrical quantity to improve dynamic characteristics of a power system at the moment of a fault; and after performing the full tracking for a period of time, if the effective value of the actual AC voltage is less than a preset threshold, performing adaptive tracking until the actual electrical quantity recovers to a stable value. The present disclosure can reduce a risk of high-frequency resonance of a VSC-HVDC, avoid deteriorating dynamic characteristics of the VSC-HVDC, and improve safety of fault ride-through of the VSC-HVDC.

IPC Classes  ?

• H02J 3/24 - Arrangements for preventing or reducing oscillations of power in networks
• H02J 3/00 - Circuit arrangements for ac mains or ac distribution networks
• H02J 3/06 - Controlling transfer of power between connected networksControlling sharing of load between connected networks
• H02J 3/36 - Arrangements for transfer of electric power between ac networks via a high-tension dc link

Abstract

Disclosed are a method and apparatus for calculating space charge distribution in an insulating layer of a direct-current cable, and a device. The method comprises: constructing a direct-current cable geometric model; setting an electronic charge injection process at an interface of an insulating layer of the direct-current cable geometric model; setting an impurity molecule dissociation process inside the insulating layer of the direct-current cable geometric model; setting simulation boundary conditions and simulation model parameters of the direct-current cable geometric model; and on the basis of the direct-current cable geometric model, simulating the space charge distribution in the insulating layer of the direct-current cable to obtain a space charge distribution result in the insulating layer of the direct-current cable. In the present invention, the dissociation process of impurity molecules generated in a cross-linking reaction of an insulating core of the direct-current cable is fully considered, such that the accuracy of solving the space charge distribution result in the insulating layer of the direct-current cable is improved, and theoretical guidance is provided for the design and operation of a cross-linked polyethylene direct-current cable.

IPC Classes  ?

• G06F 30/23 - Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
• G06F 30/25 - Design optimisation, verification or simulation using particle-based methods
• G06F 111/10 - Numerical modelling
• G06F 113/16 - Cables, cable trees or wire harnesses

Abstract

Disclosed in the present invention is a method for simulating an electric field distribution of a direct current cable, comprising: establishing a geometric model of a direct current cable; setting injection and extraction modes of charge carriers in an insulating layer under different electric fields on the basis of a preset electric field threshold; setting a transport characteristic mechanism of the charge carriers; setting a material performance parameter of the direct current cable; setting a polarity reversal operation voltage signal; and simulating the electric field distribution of the direct current cable to obtain electric field distribution characteristics of the direct current cable under a polarity reversal voltage. Further disclosed in the present invention are an apparatus, system, and device for simulating an electric field distribution of a direct current cable. In embodiments of the present invention, the electric field distribution of a direct current cable under the polarity reversal voltage can be obtained by means of a simulation test, and theoretical guidance is provided for design and operation of a high-voltage direct current cable.

IPC Classes  ?

• G06F 30/23 - Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
• G06F 30/25 - Design optimisation, verification or simulation using particle-based methods
• G06F 111/10 - Numerical modelling
• G06F 113/16 - Cables, cable trees or wire harnesses

Abstract

A measurement sample and a measurement method for the tensile strength of an interface surface between epoxy composite material and aluminum. The measurement sample comprises an epoxy composite material structural member (3), a first aluminum structural member (1), and a second aluminum structural member (2), wherein the epoxy composite material structural member (3) is in casting connection with the first aluminum structural member (1), and is in casting connection with the second aluminum structural member (2), and the surface area of the connection between the first aluminum structural member (1) and the epoxy composite material structural member (3) is greater than the surface area of the connection between the second aluminum structural member (2) and the epoxy composite structural member (3); a first connecting structure is arranged on the first aluminum structural member (1), and a second connecting structure is arranged on the second aluminum structural member (2). The connection between the first aluminum structural member (1) and the epoxy composite structural member (3) and between the second aluminum structural member (2) and the epoxy composite structural member (3) simulate connection modes between an epoxy composite material and aluminum, facilitating tension transmission. In addition, the interface surface between the second aluminum structural member (2) and the epoxy composite material structural member (3) is first to break, improving the accuracy of the measurement results, and providing a new way of testing to ensure the overall performance of a GIS/GIL insulating member.

IPC Classes  ?

• G01N 3/02 - Investigating strength properties of solid materials by application of mechanical stress Details
• G01N 3/08 - Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces

Abstract

A device and method for detecting a surface state of a basin-type insulator. In the device, a detection device can reach any circumferential direction of a basin-type insulator by means of a first transmission mechanism, and a second transmission mechanism works in conjunction with a third transmission mechanism to enable the detection unit to move on an arc in any circumferential direction of the basin-type insulator, so that the detection unit detects the surface state of any point of the basin-type insulator; the detection of any point on the surface of the basin-type insulator is implemented by means of the first transmission mechanism, the second transmission mechanism, and the third transmission mechanism. According to a calculated motion trajectory program, the three transmission mechanisms are controlled to move, so that the detection unit successively moves to the position of each point to be detected, and the detection unit is controlled to obtain detection data of the point to be detected. Thus, surface state detection is quickly completed, and the detection efficiency and accuracy are high.

IPC Classes  ?

• G01B 21/30 - Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring roughness or irregularity of surfaces

Abstract

A wave absorption net structure of a shared iron tower for mounting a 5G antenna, and a geometric dimension determination method, which belong to the technical field of communication base stations. The wave absorption net structure is arranged on an iron tower at the rear side of an antenna; the wave absorption net structure comprises a plurality of layers of metal nets, which are sequentially arranged in a staggered manner from top to bottom; each metal net is of a square structure; the meshes of the metal nets are square; and loss absorption of electromagnetic waves that are radiated by the antenna is achieved by using an eddy current, thereby reducing the scattering of the electromagnetic waves by the iron tower.

IPC Classes  ?

• H01Q 17/00 - Devices for absorbing waves radiated from an antenna Combinations of such devices with active antenna elements or systems

Abstract

A method for evaluating rheological properties of a cross-linked semiconductive shielding material, relating to the technical field of cable shielding material performance testing, and comprising: under a set initial test temperature, testing a shielding material sample to be tested to obtain a torque value corresponding to each rotating speed value; and screening and supplementing obtained test data points, and performing linear regression fitting on the rotating speed value and the torque value on the basis of an improved rheological model to successively obtain a parameter-containing yield stress, parameter-containing apparent viscosity, an offset index, and a flow index corresponding to the shielding material sample to be tested. The problems that existing cross-linked semiconductive shielding material evaluation methods are not comprehensive, the influence degree of a filler of a composite material cannot be reflected, the pseudoplasticity or dilatancy of the material cannot be reflected, and the shearing force effect cannot be reflected are solved. The method for evaluating the rheological properties of the cross-linked semiconductive shielding material ensures the reliability of an obtained data result as much as possible while ensuring that the test temperature is closer to the actual production and processing temperature, and improves the accuracy of material rheological property evaluation.

IPC Classes  ?

• G01N 25/04 - Investigating or analysing materials by the use of thermal means by investigating changes of state or changes of phaseInvestigating or analysing materials by the use of thermal means by investigating sintering of melting pointInvestigating or analysing materials by the use of thermal means by investigating changes of state or changes of phaseInvestigating or analysing materials by the use of thermal means by investigating sintering of freezing pointInvestigating or analysing materials by the use of thermal means by investigating changes of state or changes of phaseInvestigating or analysing materials by the use of thermal means by investigating sintering of softening point
• G01N 5/00 - Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
• G01N 33/44 - ResinsPlasticsRubberLeather

Abstract

Disclosed is a method for evaluating a degassing effect of a cross-linked polyethylene cable, comprising: acquiring a cable sample to be detected; heating the cable sample to be detected, so as to obtain a transparent cable sample to be detected in which an insulating layer of the cable sample to be detected is in a transparent state; under a darkroom condition, acquiring at least one light spot image of said transparent cable sample under irradiation of a monochromatic laser light source; extracting light intensity data of the at least one light spot image in a preset light spot image range; normalizing the light intensity data, and obtaining the maximum value and an average value of normalized light intensity coefficients of said transparent cable sample in a preset thickness range of the insulating layer; calculating a degassing uniformity coefficient according to the maximum value and the average value; and obtaining an evaluation result of the degassing effect of the cross-linked polyethylene cable according to the maximum value, the average value, and the degassing uniformity coefficient. By means of embodiments of the present invention, the degassing effect of the cross-linked polyethylene cable can be efficiently and quickly evaluated, and the accuracy is relatively high.

IPC Classes  ?

• G01N 21/84 - Systems specially adapted for particular applications

Abstract

A cooling garment, comprising: a cooling garment body (1), a pipeline assembly (2), an air passage assembly (3), an air nozzle assembly (4), and a fan (5). The air passage assembly (3) is locked with the air nozzle assembly (4); the air passage assembly (3) is mounted at the back of the cooling garment body (1); the pipeline assembly (2) is fixed in the cooling garment body (1); the pipeline assembly (2) is connected to the air nozzle assembly (4), and comprises a first air pipe set extending from an air nozzle to the left sleeve of the cooling garment body (1), a second air pipe set extending from the air nozzle to the right sleeve of the cooling garment body (1), and a third air pipe set extending from the air nozzle to the collar of the cooling garment body (1); all air pipes are provided with air holes (6); the end of each air pipe away from the air nozzle is in a closed state; a cavity is provided in the air passage assembly (3); and the fan (5) is provided at the cavity. The technical problem of reduction of use experience of a user due to unreasonable structural layout of existing air conditioning garments is solved.

IPC Classes  ?

• A41D 13/005 - Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches with controlled internal environment with controlled temperature

Abstract

An epoxy filler uniformity measurement method based on image detection. The method comprises: polishing and flattening the surface of an epoxy filler without changing the microstructure thereof; randomly determining a plurality of observation positions on the surface of the epoxy filler, acquiring image information of the structure of the surface of the epoxy filler on the basis of SEM microscopic detection, and converting the image information into a grayscale matrix; performing calculation on the basis of the grayscale matrix to obtain a grayscale co-occurrence matrix corresponding to each image, and calculating a corresponding feature value according to the grayscale co-occurrence matrix to obtain a feature value vector; comparing the feature value vector of each grayscale co-occurrence matrix with a feature value of a grayscale co-occurrence matrix of a pure epoxy filler, so as to preliminarily determine the distribution uniformity of the epoxy filler; and compiling variance statistics on feature value vectors of the different observation positions of the same epoxy filler, wherein the larger the variance, the poorer the uniformity of the epoxy filler.

IPC Classes  ?

• G06T 7/60 - Analysis of geometric attributes
• G06V 10/44 - Local feature extraction by analysis of parts of the pattern, e.g. by detecting edges, contours, loops, corners, strokes or intersectionsConnectivity analysis, e.g. of connected components
• G06T 7/00 - Image analysis

Abstract

A sand table simulation system for the intelligent operation and maintenance of a power cable, a simulation method, a computer device and a storage medium. The system comprises: a sand table (1), outdoor cable terminal heads (2) that are respectively provided at two ends of the sand table (1), at least two switching cabinets (3) that are provided between the outdoor cable terminal heads (2), and a cable arrangement area that is provided under the sand table (1). The outdoor cable terminal heads (2) are used for connecting a detection device; the switching cabinets (3) are used for switching the length of a miniature cable and a defect short sample; and the cable arrangement area is provided with a plurality of miniature cables (4), and the miniature cables (4) are used for connecting the outdoor cable terminal heads (2) and the switching cabinets (3).

IPC Classes  ?

• G09B 23/18 - Models for scientific, medical, or mathematical purposes, e.g. full-sized device for demonstration purposes for physics for electricity or magnetism
• H02B 1/24 - Circuit arrangements for boards or switchyards
• H02J 13/00 - Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the networkCircuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
• G01R 31/08 - Locating faults in cables, transmission lines, or networks

Abstract

A method for detecting a storage life of a pre-crosslinked material is provided. Tableting is performed on an unaged pre-crosslinked material to obtain crosslinked polyethylene. A crosslinking degree and a mechanical property of the crosslinked polyethylene are measured to obtain reference data. The pre-crosslinked material is heated to obtain a fast-aged pre-crosslinked material. The crosslinking degree and mechanical property of crosslinked polyethylene obtained from the fast-aged pre-crosslinked material are measured to obtain measurement results, which are compared with the reference data. If comparison results all fall within corresponding ranges, the time period of heating is increased by a step to repeat the above steps until the comparison results do not all fall within the corresponding ranges. A result obtained by subtracting the step from the time period of heating is converted into a time period of storage at the room temperature.

IPC Classes  ?

• G01N 25/02 - Investigating or analysing materials by the use of thermal means by investigating changes of state or changes of phaseInvestigating or analysing materials by the use of thermal means by investigating sintering
• G01N 17/00 - Investigating resistance of materials to the weather, to corrosion or to light

Abstract

Disclosed in the present invention is a method for preparing a semi-conductive shielding material used for a high-voltage cable from low-impurity conductive carbon black. The semi-conductive shielding material is prepared from the following raw material components in parts by weight: 55-65 parts of a polar polyolefin copolymer, 26-35 parts of conductive carbon black, 1-3 parts of a dispersing agent, 0.5-2 parts of a cross-linking agent, 1-2 parts of a lubricating agent and 0.5-1 part of an antioxidant. The conductive carbon black is conductive carbon black with the content of 325-mesh sieve residues of less than 7 ppm obtained by reducing the content of sieve residues in the post-treatment stage of carbon black by means of staged treatments. The method comprises the following preparation steps: mixing a conductive carbon black, a dispersing agent, a lubricating agent, an antioxidant and a polar polyolefin copolymer until uniform; subjecting the resulting mixture to melt extrusion in a double-screw extruder, and subjecting same to underwater bracing, pelletizing and drying to obtain granules; and heating the granules to 65ºC, then mixing same with a cross-linking agent until uniform, and placing the resulting mixture in an oven at 65ºC for 8 hours to obtain a semi-conductive shielding material. The semi-conductive shielding material prepared in the present invention has good mechanical and electrical properties and extremely high extrusion surface smoothness, and can meet the use requirements of high-voltage cables.

IPC Classes  ?

• H01B 3/44 - Insulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances plasticsInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances resinsInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances waxes vinyl resinsInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances plasticsInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances resinsInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances waxes acrylic resins

Abstract

Disclosed are a high-voltage cable semi-conductive shielding material featuring high-efficiency dispersion of conductive carbon black and a preparation method therefor, said material comprising the following components in parts by weight: 55-65 parts of a matrix resin, 28-35 parts of conductive carbon black, 0.5-2.5 parts of a dispersant, and 4-7 parts of a functional additive; the dispersant is polyvinylpyrrolidone. In the present invention, by means of the selection of the matrix resin, the dispersant and an antioxidant, as well as the synergistic effect of the dosage ratios of the components, the semi-conductive shielding material has a smooth surface and the conductive carbon black is uniformly dispersed in the matrix resin. In addition, the obtained semi-conductive shielding material has excellent mechanical properties and electrical properties.

IPC Classes  ?

• C08L 23/08 - Copolymers of ethene
• C08L 39/06 - Homopolymers or copolymers of N-vinyl-pyrrolidones
• C08K 3/04 - Carbon
• C08K 5/134 - Phenols containing ester groups
• C08K 5/526 - Esters of phosphorous acids, e.g. of H3PO3 with hydroxyaryl compounds

Abstract

The present application provides a full-link simulation system for use in a flexible direct-current converter valve control system, comprising a simulation background, a CPU simulation machine, and a power fault simulation device, wherein the flexible direct-current converter valve control system comprises a pulse distribution screen, a valve control host screen, a pole control screen, a monitoring background, and a merging unit; the monitoring background is separately communicationally connected to the pulse distribution screen, the valve control host screen, and the pole control screen; the pulse distribution screen is communicationally connected to the valve control host screen; the valve control host screen is communicationally connected to the pole control screen; the power fault simulation device comprises an FPGA simulation machine and a first pulse interface screen, or the power fault simulation device is a second pulse interface screen having an MMC simulation calculation function. The present application can perform complete simulation test on the valve control full link of a flexible direct-current converter valve by arranging the pulse interface screen, so as to obtain a more accurate simulation result.

IPC Classes  ?

• G05B 17/02 - Systems involving the use of models or simulators of said systems electric

Abstract

Provided is an electric energy safety authentication apparatus, comprising a front casing (500), a rear casing (600), a sealing ring (400), and a fastener connection structure (100); a sealing groove (410) is provided at a connection between the front casing (500) and the rear casing (600); the fastener connection structure comprises a first connecting member (110), a second connecting member (120), a first fastener member (210), a second fastener member (200), a first spring (310), and a second spring (320); the first spring (310) is disposed in the sealing ring (400); the first connecting member (110) and the second connecting member (120) are disposed at two ends of the first spring (310), respectively, both penetrating through the sealing ring (400), and both being provided with annular clamping grooves (130); the first fastener member (210) is disposed on the front casing (500), and the second fastener member (220) is disposed on the rear casing (600); each fastener member comprises a first clamping member (231) and a second clamping member (232); each clamping member is connected to the front casing (500) or the rear casing (600) by means of a second spring (320); the first clamping member (231) and the second clamping member (232) jointly form a clamping space mating with the annular clamping groove (130). The technical problems of poor sealing and inconvenient installation in the prior art can be effectively solved.

IPC Classes  ?

• H02B 1/28 - CasingsParts thereof or accessories therefor dustproof, splashproof, drip-proof, waterproof or flameproof
• H02B 1/46 - BoxesParts thereof or accessories therefor