Abstract

The present disclosure provides an amplitude limiting system of insulated aerial work platform, including an insulated aerial work platform having a telescopic arm, an insulated folding arm and retractable supporting legs, a luffing cylinder, a first pressure sensor, a balance valve, a selector valve, a flow meter, and a controller; the luffing cylinder is installed between the telescopic arm and the insulated folding arm and includes a hydraulic pressure chamber; the first pressure sensor is connected to the hydraulic pressure chamber of the luffing cylinder and is electrically connected to the controller; the balancing valve is arranged on the luffing cylinder; the selector valve is connected to the balance valve; the flow meter is connected in between the selector valve with the balance valve and is electrically connected to the controller.

IPC Classes  ?

• B66F 17/00 - Safety devices, e.g. for limiting or indicating lifting force
• B66F 11/04 - Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations

Abstract

Disclosed is a cross-network segment message forwarding method for a dispatching automation system,characterized in that: message forwarding servers of a transmitting end system and a receiving end system both adopt a dual-computer redundancy configuration, and the two computers are operated in a mode of a master computer and a slave computer; a wide area dual-network redundancy configuration is adopted between the transmitting end system and the receiving end system, and each of the message forwarding servers is connected to a wide area dual-network; and when the transmitting end system performs one-way message forwarding to the receiving end system, the receiving end system does not transmit a feedback packet to the transmitting end system. The method satisfies the high-performance and high-reliability real-time requirements for message forwarding of a dispatching automation system between different network segments, and further ensures the uniqueness of a message.

IPC Classes  ?

• H04L 12/58 - Message switching systems
• H04L 12/707 - Route fault prevention or recovery, e.g. rerouting, route redundancy, virtual router redundancy protocol [VRRP] or hot standby router protocol [HSRP] using path redundancy
• H04L 29/06 - Communication control; Communication processing characterised by a protocol
• G06Q 50/06 - Energy or water supply

Abstract

An in-place vertical lifting device in a large-sized transformer bell cover chamber. Left and right double scissor fork lifting devices (3, 4) pushed by left and right pneumatic cylinders (11, 12) are respectively arranged on left and right bases (1, 2); a cross beam (5) is arranged at the tops of the left and right double scissor fork lifting devices (3, 4); lifting hooks are arranged on the cross beam (5); a displacement sensor (6) for detecting whether lifting heights of the left and right double scissor fork lifting devices (3, 4) are consistent is arranged on the cross beam (5); the displacement sensor (6) is connected with a control system; the cross beam (5) comprises left and right groups of longitudinal rods and front and rear cross bars; one of the left and right groups of longitudinal rods consists of two longitudinal rods; each longitudinal rod is fixedly connected to the top of one scissor fork lifting part of the double scissor fork lifting devices (3, 4); and four cross bars which are parallel to one another are fixedly connected to the left and right groups of longitudinal rods. The lifting device adopts a double scissor fork type gantry structure, and has the maximum lifting height of 8 meters and the maximum lifting weight of 10 tons.

IPC Classes  ?

• B66F 7/08 - Lifting frames, e.g. for lifting vehiclesPlatform lifts with platforms supported by levers for vertical movement hydraulically or pneumatically operated
• B66C 19/00 - Cranes comprising trolleys or crabs running on fixed or movable bridges or gantries
• B66C 13/20 - Control systems or devices for non-electric drives

Abstract

Disclosed is an amplitude limiting system of an insulated aerial work platform. The insulated aerial work platform (1) comprises a telescopic arm (11), an insulated foldable arm (12) and a telescopic supporting leg (13); an amplitude-variable oil cylinder (2) is installed between the telescopic arm (11) and the insulated foldable arm (12); a first pressure sensor (3) is connected to an oil pressure cavity (21) of the amplitude-variable oil cylinder (2), and is electrically connected to a controller (8) through signals; a balance valve (4) is provided on the amplitude-variable oil cylinder (2); a reversing valve (5) is connected to the balance valve (4); and a flow meter (6) is connected in series between a directional control valve (5) and the balance valve (4), and is electrically connected to the controller (8) through signals. The amplitude limiting system of the insulated aerial work platform is capable of precisely limiting the amplitude without the need for placing electrical components on the telescopic arm of the insulated aerial work platform, thereby improving the safety of aerial work.

IPC Classes  ?

• B66F 11/04 - Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
• B66F 17/00 - Safety devices, e.g. for limiting or indicating lifting force

Abstract

A power quality disturbance source locating system and locating method thereof. The locating system comprises: a power quality management primary station and power quality online-monitoring devices (PQMD) connected to the primary stations via an Ethernet connection. The PQMDs are placed at each monitoring point of a transmission line of a radial power distribution system, and connected together via the Ethernet connection. When an actual disturbance event occurs in the system and is detected, the PQMD is configured to record a point in time at which a disturbance source is detected, and notify, over the Ethernet by broadcasting, the other PQMDs in the network to set the point in time as a reference to activate an disturbance wave recording system, wherein the disturbance wave recording system is configured to record sampled data of N cycles of waves before the point in time and N cycles of waves after the point in time, and transmit the sampled data in real time to the power quality management primary station, thereby establishing a system coverage matrix and a system direction matrix by mutual cooperation among the PQMDs, and locating the disturbance source.

IPC Classes  ?

• G01R 31/08 - Locating faults in cables, transmission lines, or networks

Abstract

smart power distribution system and a method to progressively dispatch the power is described. The method steps are all automatic and self-adaptive. The method can be executed in an unattended manner to automatically correlate real time data vs. historical data, planning data vs. operation data. Based on a long cycle periodical variation and short-term random variations in load, and taking into account the temporary load power supply and maintenance needs, a multi-stage progressive multiple time scales optimal dispatching method is developed, including the distributed power, micro-grids, energy storage devices, electric vehicles charge-discharge facility and other elements of the Intelligent power distribution systems, to achieve coordinated operation of the network, power, load resources to ensure a continuous safe and reliable smart power distribution system operated at high quality and efficiency.

IPC Classes  ?

• G05D 3/12 - Control of position or direction using feedback
• G05D 5/00 - Control of dimensions of material
• G05D 9/00 - Level control, e.g. controlling quantity of material stored in vessel
• G05D 11/00 - Control of flow ratio
• G05D 17/00 - Control of torqueControl of mechanical power
• G05D 23/00 - Control of temperature
• G05F 1/66 - Regulating electric power
• G06Q 10/04 - Forecasting or optimisation specially adapted for administrative or management purposes, e.g. linear programming or "cutting stock problem"
• G06Q 10/06 - Resources, workflows, human or project managementEnterprise or organisation planningEnterprise or organisation modelling
• G06Q 50/06 - Energy or water supply
• G05B 15/02 - Systems controlled by a computer electric

Abstract

A method for graphics interaction between a grid production management system and a scheduling automation system. The method comprises: acquiring an SVG file and a CIM file of a substation primary system diagram of a standard format which are provided by an OPEN3000 system; loading a graphics library of a VG file, so as to parse the specific attribute of a graphicss primitive; parsing the SVG file, so as to acquire layer information; parsing the CIM file, so as to acquire ledger information about a device; and associating a drawing device with a ledger, so as to generate the substation primary system diagram. The interaction and interoperation of graphics data are achieved through a sharing and exchanging mechanism of the substation primary system diagram of a grid graphics system and the OPEN3000 system, so that the flowing and sharing of graphics topology data are achieved, thereby reducing the complexity and workload of data maintenance.

IPC Classes  ?

• G06Q 10/06 - Resources, workflows, human or project managementEnterprise or organisation planningEnterprise or organisation modelling
• G06Q 50/06 - Energy or water supply
• G06F 17/30 - Information retrieval; Database structures therefor

Abstract

The present invention provides a power-cable ground current self-adaptive monitoring method. The steps including configuring a sample baseline, determining an impact factor set of the sample data, sampling real-time data of ground current by a power-cable ground current monitoring system, perform digital filtering on the sampled real-time data of ground current, applying a self-adaptive method to process the filtered sample data, and uploading the processed sample data to a backend monitoring device for real-time monitoring. The present invention may solve high energy loss and low information amount problems. The power consumption of monitoring device may be reduced by more than 50%, and server resource occupancy percentage may be lowered by about 20%. Efficiencies of evaluating external insulation status of the are enhanced. The present invention provides a novel grade ranking criterion, which may be dynamically corrected based on actual power-line operations, and reduces objective interferences during value determination process.

IPC Classes  ?

• G01R 31/02 - Testing of electric apparatus, lines, or components for short-circuits, discontinuities, leakage, or incorrect line connection
• G01R 19/25 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques

Abstract

A smart electric meter capable of measuring residual current comprises a housing (1), a wiring terminal base (2), a phase line (5), a null line (6), a relay (3), a phase line current sampling resistor (4), a residual current transformer (7) and a circuit device (8). The relay (3), the phase line current sampling resistor (4) and the residual current transformer (7) are disposed in the housing (1). The phase line (5) and the null line (6) pass through the residual current transformer (7). The circuit device (8) comprises a voltage sampling module (81), a signal processing module (82), an A/D conversion module (83), an electric energy metering module (83), a single-chip microcomputer processing module (85), a relay control module (86), a communication module (87), an LCD display module (88), a button module (89) and a power supply module (80). The smart electric meter can perform real-time measurement and recording of the residual current in a user line and has residual-current over-limit alarm event and event recording functions. The smart electric meter only needs to be improved on the basis of an existing smart electric meter, is not high in the improvement cost, does not affect the functions and the outline dimensions of the existing electric energy meter, and is convenient to popularize in large scale.

IPC Classes  ?

• G01R 22/10 - Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
• G01R 19/25 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques

Abstract

A diagnostic method for ferromagnetic resonance in a 10 kV neutral ungrounded system, the method comprising: when a voltage at two triangular ends of a PT opening exceeds a preset limit value, capturing a voltage A relative to ground, a voltage B relative to ground, a voltage C relative to ground, a neutral point voltage, and a neutral point frequency; according to the three-phase voltage A-B-C, first classifying a fault as a fractional frequency resonance/high frequency resonance fault type or a fundamental resonance/single-phase-to-ground fault type; classifying the fault as a fractional frequency resonance or a high frequency resonance according to the frequency thereof, and respectively processing the fundamental resonance/single-phase-to-ground fault type according to an energy method and a loop ground current method; firstly obtaining a result via the energy method, and then verifying the same via the circuit ground current method, and if the two methods produce the same result, it indicates that the determination is correct, thereby distinguishing the fault as a fundamental resonance fault or a single-phase-to-ground fault; transmitting the classified faults or a result indicating a non-ferromagnetic resonance single-phase-to-ground fault to a terminal for display, so as to assist maintenance personnel in processing a corresponding fault in a timely manner.

IPC Classes  ?

• G01R 31/08 - Locating faults in cables, transmission lines, or networks
• 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

Disclosed are an electric power communication network mobile operation and maintenance system and method, the electric power communication network mobile operation and maintenance system comprising a handheld terminal (1) and a remote background server (2); the handheld terminal (1) communicates with the remote background server (2) over a 3G or 4G wireless public network; the handheld terminal (1) comprises a smartphone (3), an external memory (4) and a data gathering terminal (5), the external memory (4) comprising a static random access memory (SRAM) and a flash memory (Flash), and the smartphone (3) and the external memory (4) communicate with each other. The electric power communication network mobile operation and maintenance method use a process of "store-gather-store-compare-display-gather-compare-store-transmit back", finally realizing guiding onsite operation and maintenance and displaying results.

IPC Classes  ?

• H04L 12/24 - Arrangements for maintenance or administration
• G06Q 50/06 - Energy or water supply

Abstract

An optical cable splicing method, comprising the following steps: (1) selecting an optical cable with an appropriate length and winding the end surface of the optical cable with adhesive tape; (2) peeling the optical cable, when one person peels the optical cable, another person performs the preparation work for an optical cable splice closure, an optical cable fusing device and tools and materials needed by fusing; (3) performing the fiber core splicing process; (4) during the optical cable splicing process, performing real-time measurement at the other end of an optical fiber while fusing is carried out by another worker, and instantly notifying the worker to perform fusing again when it is found that fusing losses exceed the standard. By adopting the method, the optical cable splicing process is more reasonable, the optical cable fusing losses are small, time is saved, and the optical cable splicing quality is improved.

IPC Classes  ?

• G02B 6/255 - Splicing of light guides, e.g. by fusion or bonding
• G02B 6/44 - Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables

Abstract

The present invention provides a portable single-phase air bypass switch for live power distribution network, including a housing member, a positioning member, a conductive circuit member, a clutch member, a switch-closing member and a switch-opening member. The positioning member includes a positioning nut, positioning frames, and a positioning column. The conductive circuit member includes a conductive end cover, an upper conductive rod, a pressing sleeve, a coupling nut, a conductive sleeve pipe, a stationary contact, a movable contact, and a lower conductive rod. The switch-closing member includes a switch-closing energy-storage rod, a switch-closing energy-storage ring, a switch-closing spring, a switch-closing positioning pin, a switch-closing release ring, and an inner sleeve pipe. The switch-opening member includes a small shaft, a switch-opening spring, a stopping block, a switch-opening energy-storage shaft, a connection rod, a switch-opening energy-storage pressing head, a switch-opening positioning pin, and a switch-opening release ring.

IPC Classes  ?

• H01H 33/73 - Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid having stationary parts for directing the flow of arc-extinguishing fluid, e.g. arc-extinguishing chamber wherein the break is in air at atmospheric pressure, e.g. in open air
• H01H 3/30 - Power arrangements internal to the switch for operating the driving mechanism using spring motor
• H01H 31/00 - Air-break switches for high tension without arc-extinguishing or arc-preventing means

Abstract

The present invention provides an intelligent calibration system for backup-power automatic switching devices, including a power supply module, a control module for logic controls, a voltage output module and a current output module for outputting simulated voltage and current, a signal feedback module for sampling outputted voltage and current signals, a simulated circuit-breaker group, an auxiliary relay, a USB interface for communication, a keyboard for information input, a display module for information interaction and real-time panel presentation, an interface module to facilitate plug-in wires, an indicator light for indicating operation status and a computer for controlling the testing globally. The present invention facilitates easy and fast wiring, and conveniently displays operation interface and related information. The operation is intuitive and simple, overall test efficiency is improved. Further, comprehensive tests for BAS devices can be performed with high measurement accuracy, while avoiding influences of human operations to the test results.

IPC Classes  ?

• G01R 31/327 - Testing of circuit interrupters, switches or circuit-breakers
• G01R 31/319 - Tester hardware, i.e. output processing circuits
• G01R 35/00 - Testing or calibrating of apparatus covered by the other groups of this subclass
• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

A magnetizing inrush current restraining method and device. According to the method, the state of a transformer before no-load closing is considered comprehensively, and different control strategies are adopted according to different states; during local manual opening or distant remote-control opening, an angle identical to an opening phase angle is selected for closing; during tripping caused by short-circuit faults, magnetizing inrush currents at the moments of different closing phase angles in the range of 0-360 degrees are estimated according to three-phase voltage information at the moment of opening to obtain a closing phase angle corresponding to the minimum magnetizing inrush current; and during man-made demagnetization after opening, the angle of any of three phases is selected as 90 degrees for closing. The method and the device have the capability of automatically recognizing the state of the transformer before no-load closing and executing the corresponding control strategy and the capability of automatically learning the time needed by switch closing and automatically adjusting closing exit triggering moments; the device also has a complete set of functions for protecting electric quantity of the transformer.

IPC Classes  ?

• H02P 13/00 - Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output
• H02H 7/04 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers

Abstract

A winding state evaluation method under an external fault of a transformer. Current flows through a winding wire of a transformer, the magnitude of the electromagnetic force received by the winding is proportional to the square of the passing current, and in the condition of high fault current, the electromagnetic force received by the winding is hundred times of that in a normal condition, winding deformation occurs when the winding strength is insufficient, and the elastic deformation is partly recovered after fault elimination; however, the cumulative effect of the winding deformation causes a large accident in the next fault condition. The collected voltage and current data on two sides of the transformer before and in the fault are used and an appropriate numerical algorithm is utilized to identify and obtain the values of leakage inductance of the transformer before and in the fault, the deviation of the leakage inductance of the winding at each moment in the fault is calculated and analyzed, and a tendency chart of the deviation is made with time as the horizontal coordinates. The impact of the fault to the winding of the transformer and the state of the winding are evaluated according to the tendency chart of the deviation.

IPC Classes  ?

• G01R 31/06 - Testing of electric windings, e.g. for polarity
• G06F 19/00 - Digital computing or data processing equipment or methods, specially adapted for specific applications (specially adapted for specific functions G06F 17/00;data processing systems or methods specially adapted for administrative, commercial, financial, managerial, supervisory or forecasting purposes G06Q;healthcare informatics G16H)

Abstract

Disclosed is an encryption transmission and verification method for power communication network field operation and maintenance data. By using a data transmission technology, a data encryption transmission and field data remote verification feedback technology is introduced into field operation and maintenance of a power communication network, and secure transmission and remote verification on field operation and maintenance data are conducted by an intelligent means. The data encryption transmission and verification method of the present invention comprises a process of binding, collection, encryption, transmission, decryption, verification, encryption, backhaul and decryption; it is ensured that a communication network of a power enterprise operates safely and stably, field operation and maintenance are standardized, a remote technical support function is achieved, and field data support is provided for a work decision.

IPC Classes  ?

• H04L 29/06 - Communication control; Communication processing characterised by a protocol

Abstract

A method for suppressing a low frequency oscillation of a resonance mechanism of an electric power system, comprising: performing signal collection on a system in a measurement step, and performing sequential processing including a blocking step, a proportional resonant control step, a phase compensation step and an amplitude limiting step on a bus power signal therein to obtain an output control signal (Up); superposing the output control signal (Up) and a reference value (Pref) corresponding to a unified power flow controller, and performing a difference operation on the superposed value and the bus power signal; performing difference operations on a bus reactive power signal (Q), a direct current side capacitance voltage signal (Vdc) and a bus voltage signal (Vs) obtained in the measurement step and corresponding reference values thereof respectively; performing sequential processing including a first-order inertial step and a proportional-integral step on each difference signal to obtain currents (Iq, Ip) and voltages (Vq, Vp) corresponding to an output axis q and an output axis p; and injecting the voltages and the currents into the electric power system, thereby increasing damping for suppressing the low frequency oscillation of the resonance mechanism in the system. By means of the method, a resonance oscillation amplitude can be effectively decreased, and the low frequency oscillation of the resonance mechanism is suppressed.

IPC Classes  ?

• H02J 3/24 - Arrangements for preventing or reducing oscillations of power in networks

Abstract

Disclosed is an electronic map hierarchical management method, the method comprising: establishing an electronic map hierarchical model; determining the plane conversion relationship between a map photo and a ground coordinate in a basic map layer, and the relationship between screen offset and proportion; if the screen is scaled or translated, respectively searching and displaying a new map photo. The present invention employs a fuzzy hierarchical management algorithm to facilitate partial modification and changing of a map without any special maintenance management tool, thus being suitable for a small-scale electronic map; when only a portion of a certain map layer needs to be displayed, only said portion rather than a complete picture is saved, thus greatly reducing the map creation and maintenance workload.

IPC Classes  ?

• G06T 3/40 - Scaling of whole images or parts thereof, e.g. expanding or contracting

Abstract

Disclosed is a sound-light alarm apparatus for transformer substation fault tripping. The apparatus comprises a power source module, a control circuit module, a signal acquisition module, an LED display module, an alarm module and a heat dissipation module. The signal acquisition module is provided with a signal receiving end (Uin), a current limiting resistor (R20) and a photoelectric coupler. A tripping signal flows through the photoelectric coupler via the current limiting resistor, so that a triode conduction potential of the photoelectric coupler changes. A main control apparatus acquires the change in the signal, and the words "fault tripping" are displayed via the LED display module. The alarm module triggers an alarm apparatus to give an alarm. The staff is reminded to pay attention, so that the staff performs resetting and alarm pause operations on a device via a man-machine interface apparatus. Even though the working position of overhaul is far from a main control room, the field staff also can effectively obtain an alarm signal. Prompt information is timely and effectively sent, and the working efficiency of the staff is improved.

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

Abstract

A system and method for judging interior looseness of a power transformer. The system for judging and initially positioning interior looseness of a power transformer comprises a signal conditioning circuit, a data collection device and a data analysis module that are sequentially connected, and further comprises three vibration sensors. The three vibration sensors are connected to the data collection device through the signal conditioning circuit, and measure vibration signals of three phases of the power transformer correspondingly. The vibration signals are amplified, filtered and denoised by the signal conditioning circuit and then transmitted to the data collection device. The data collection device transmits the collected vibration signals to the data analysis module. The data analysis module stores and processes the vibration signals and carries out fault judgment. By means of the solution, the looseness fault of the transformer is judged through 100 Hz signals in the vibration signals according to the characteristic of the change of the vibration signals along with the looseness degree.

IPC Classes  ?

• G01R 31/06 - Testing of electric windings, e.g. for polarity
• G01H 17/00 - Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the other groups of this subclass
• G01M 13/00 - Testing of machine parts

Abstract

An intelligent polarity detection apparatus and method for a four-star type voltage transformer. The apparatus comprises a primary side unit (1) and a secondary side unit (2). The primary side unit (1) comprises an excitation power module (11), a control module (12) and a wireless communication module (13). The excitation power module (11) outputs a pulse voltage when used. The secondary side unit (2) comprises a subtracter (21), an operational amplifying module (22), an amplitude limiting circuit module (23), an AD acquisition module (24), a first single-chip microcomputer processing module (25), a first RS232 communication module (26), a second wireless communication module (27) and a handheld terminal (28). The handheld terminal (28) comprises a touch screen (28-1) and a second single-chip microcomputer processing module (28-2). The detection method mainly includes that wires are connected at a time and electrified, the touch screen (28-1) is operated so that a detection command is sent, the primary side unit (1) receives the command and outputs the pulse voltage, and the secondary side unit (2) acquires the secondary side output voltage of the four-star type voltage transformer, makes a judgment according to a set duty ratio criterion and displays a result. The technical solution is simple in structure, convenient to operate, high in adaptability, simple in criterion logic and high in reliability of the judgment result.

IPC Classes  ?

• G01R 31/06 - Testing of electric windings, e.g. for polarity

Abstract

A closed loop test system for a monitoring host of an intelligent substation comprises an IEC61850 protection measurement and control simulation device, a monitoring host, a station level switch, an IEC61850 network packet recording analyzer and a test workstation. The IEC61850 protection measurement and control simulation device, the monitoring host and the IEC61850 network packet recording analyzer are connected to the station level switch; and the test workstation is connected to the IEC61850 protection measurement and control simulation device. In a test method of the system, the test workstation compares a test strategy, an analysis brief report and an export file, and automatically generates a test report according to the comparison result. Therefore, a test on the monitoring host is conducted in an accurate, reliable and fast manner, the problem of lack of a test system with perfect functions and an excellent test method for the monitoring host to realize a comprehensive and quantitative test is solved, and the demand for testing an intelligent substation is met.

IPC Classes  ?

• G05B 23/02 - Electric testing or monitoring

Abstract

The present invention relates to the field of solar cell material. Provided are a solar cell device based on strain type heterojunction quantum dots and manufacturing method thereof. The solar cell device comprises at least two Ge/Si quantum dot structural layers grown on a doped silica-based substrate (1); the Ge/Si quantum dot structural layers comprise Si film layers (3) having Ge quantum dots (2) of 2-7 nm in diameter, the innermost Si film layer (3) being 2-4 nm, and increasing incrementally therefrom; the outermost quantum dot structural layer is SiO2 cover film layer (4) filling gaps between quantum dots, forming a multi-layer structure of quantum dot array filling film; a silicon doped layer protective film (5) of 10-20 nm in thickness is grown on the cover film layer (4); electrodes (7) are grown on the outer surfaces of the silicon doped layer (5) and the silica-based substrate (1). The energy band ranges from 0.4 eV to 0.22 eV and the corresponding conversion efficiency is 55%-57%, an increase of more than 7% compared to the prior art, significantly improving the photoelectric conversion efficiency of a solar cell.

IPC Classes  ?

• H01L 31/0725 - Multiple junction or tandem solar cells
• H01L 31/074 - SEMICONDUCTOR DEVICES NOT COVERED BY CLASS - Details thereof adapted as photovoltaic [PV] conversion devices characterised by at least one potential-jump barrier or surface barrier the potential barriers being only of the PN heterojunction type comprising a heterojunction with an element of Group IV of the Periodic System, e.g. ITO/Si, GaAs/Si or CdTe/Si solar cells
• H01L 31/18 - Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof

Abstract

The present invention relates to a method for positioning a space of an ultra-high-frequency partial discharge signal, and in particular, to a method for distinguishing an initial time point of an ultra-high-frequency partial discharge signal. The method comprises the following steps: a, triggering signal collection: setting a triggering level Vi of a signal, and when it is detected that a real-time voltage exceeds the triggering level Vi, triggering a signal collection system to start signal collection; and b, setting a triggering threshold of four-path waveforms: using the triggering level Vi as a threshold and a signal collection initial point, searching for a first peak value of the waveforms backwards, and further, searching for a first zero crossing point backwards as a wavefront time point of signals. By using a threshold method, the four-way waveforms are allowed to be not fully consistent with each other, which accords with a result of onsite detection of partial discharge signals. The threshold method is concise in computing, and does not need to reprocess the waveform signals, so that the initial time point is distinguished more accurately. In addition, when the zero crossing point is computed, the zero crossing point is gradually approached by performing quadratic interpolation for multiple times, and the accuracy of the time point of the zero crossing point is improved.

IPC Classes  ?

• G01R 31/12 - Testing dielectric strength or breakdown voltage
• G01R 31/08 - Locating faults in cables, transmission lines, or networks

Abstract

A line connector with a spring arc-extinguishing device, comprising an arc-extinguishing tube (1), a pressure relief cap (3) and a fuse (7), wherein the upper end of the arc-extinguishing tube is connected to an upper contact (2); the pressure relief cap is connected to the upper end of the upper contact; the lower end of the arc-extinguishing tube is connected to a spring seat (6); through holes in communication with the arc-extinguishing tube are respectively provided on the spring seat and the upper contact; a spring (5) and a sliding contact (4) are also sheathed on an outer wall of the arc-extinguishing tube, the spring is located between the spring seat and the sliding contact, and a fuse fixing device (8) is provided on the sliding contact (4); the upper end of the fuse is fixed to the upper end of the upper contact by extrusion through the pressure relief cap; after penetrating downwards through the upper contact, the arc-extinguishing tube and the spring seat in sequence, the lower end of the fuse is folded back upwards and is connected to the fuse fixing device; and the length of the fuse enables the spring to be in a compressed state. When the fuse is fused into two sections, the spring enables the distance between the two sections of the fuse to be lengthened rapidly, so as to achieve arc extinguishing, such that the reliability is high. The structure is simple, the maintenance is convenient, the costs are low, and the practicality is strong.

IPC Classes  ?

• H01H 85/54 - Protective devices wherein the fuse is carried, held, or retained by an intermediate or auxiliary part removable from the base, or used as sectionalisers
• H01H 85/38 - Means for extinguishing or suppressing arc

Abstract

Disclosed are a method and system for searching a cross-regional power supply range based on a CIM model, the method comprising: creating a hash function according to the size of a power grid of the power supply voltage; mapping identification numbers of all devices in the power grid to a discrete hash table according to the hash function, using a chain address to resolve a conflict, and using the discrete hash table to form a hash topological graph of the power grid; and using the hash topological graph to search the power supply range of a specific device. The method and system can quickly locate devices within a power supply range by establishing a discrete hash table for all device resources, thus greatly reducing the amount of computation and improving the efficiency of searching within the power supply range.

IPC Classes  ?

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

Abstract

An intelligent transformer substation warning message reporting method, comprising: adding a data quality bit attribute to an interval object in a substation monitoring system, and marking whether the interval object is in a maintenance state by changing the value of the data quality bit; when a warning signal is generated in an interval, a direct-transfer warning module, before composing a direct-transfer warning text message, finds the interval object generating a warning signal, and determines according to the value of the data quality bit whether the interval object is in a maintenance state; if it is not, then the direct-transfer warning module composes the direct-transfer warning text message and forwards same to a main scheduling station; if it is, then the direct-transfer warning module does not compose the direct-transfer warning text message. A substation end preprocesses the direct-transfer warning text message before reporting same to a scheduling center. By means of such techniques as configuring in a backend monitoring platform a warning message direct transmission maintenance shield, erroneous warning messages generated by an interval in maintenance state are prevented from being reported to the scheduling center, thus reducing interference to duty staff and greatly increasing work efficiency.

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

Abstract

A method for viewing a single line diagram of an electric power system on a mobile terminal in real time, comprising: loading a mobile terminal of a WebView control, and a power grid GIS platform and an intermediate server of an electric power system, wherein the WebView control contains an SVG viewer; generating, by the power grid GIS platform, an SVG file and a CIM file of a single line diagram and transmitting same to the intermediate server; when the intermediate server parses the CIM file to obtain ID codes of devices, reconstructing the SVG file through the ID codes; obtaining and parsing, by the mobile terminal, the CIM file and the reconstructed SVG file, acquiring file generation time, the ID codes of the devices required to respond to click events and relative coordinates of these devices in the SVG file, and establishing a database, to conduct local persistence. On-site staff can view a single line diagram through a mobile terminal in real time, so that the construction speed and the working efficiency are effectively increased, thereby having great significance for power grid rush-repair work.

IPC Classes  ?

• G06F 9/445 - Program loading or initiating
• G06Q 50/06 - Energy or water supply

Abstract

A transformer noise suppression method, belonging to the technical field of electric power supply. The noise suppression method of individual active noise reduction system comprises the steps that: (1) initial noise digital signals are received and converted to serve as input signals of a BP neural network; (2) the input signals are processed to generate secondary digital signals; (3) the secondary digital signals are output to a loudspeaker and secondary noise is generated; (4) remained noise digital signals obtained by overlapping the initial noise and the secondary noise are received; whether remained noise digital signals is continuously constant for the set times is judged; if yes, the secondary digital signals are kept outputting; (5)if not, BP neural network parameters are optimized and adjusted with the amplitude of the remained noise digital signals being minimum as the optimality principle; remained noise digital signals of previous step are served as new input signals and the step (2) is executed again. At proper position about oil boxes of transformers multi individual path noise reduction systems are arranged in order to constitute the multi-path suppression system of transformer noise. The transformer noise suppression method can quickly suppress the noise within a certain range of noise sources such as transformers; an ideal noise reduction effect can be achieved and the problems of high cost, poor effect and poor portability with traditional noise reduction methods are solved.

IPC Classes  ?

• H01F 27/33 - Arrangements for noise damping
• G06N 3/02 - Neural networks

Abstract

A mechanical energy and electric energy conversion device. The device comprises a semiconductor substrate (1) provided with a nanoscale fluid passage. The semiconductor substrate is installed in a cavity full of electrolytes (3). The cavity is provided with a first surface (6) and a second surface (4) that are opposite to two sides of the semiconductor substrate respectively and are movable relative to the semiconductor substrate after being pressed. The cavity is divided by the two sides of the semiconductor substrate, and the first surface and the second surface are fixedly connected with a positive external electrode plate (7) and a negative external electrode plate (5) that are connected with a positive electrode and a negative electrode of a power source (10) respectively. The mechanical energy and electric energy conversion device has the advantages of being simple in structure and high in conversion efficiency, and can convert clean resources into electric energy.

IPC Classes  ?

• H02N 11/00 - Generators or motors not provided for elsewhereAlleged perpetua mobilia obtained by electric or magnetic means

Abstract

An adaptive monitoring method for a grounding current of a power cable. The method comprises the steps of: setting a sampling reference; determining an impact factor set of sampled data; sampling a grounding current by a monitoring system for a grounding current of a power cable in real time; conducting digital filtering on data of the grounding current which is sampled in real time; processing the filtered sampled data using an adaptive algorithm; and uploading the processed sampled data to a background monitoring device for real-time monitoring. The method is different from an existing method in which a monitoring time interval is directly taken as a data sampling frequency. By means of the method, the problems that the energy loss is large and the amount of data monitoring information is small in a monitoring process can be solved, so that more than 50% of power consumption of a monitoring device can be effectively reduced, about 20% of resource occupancy of a server can be reduced, and the efficiency of external insulation state evaluation for a cable can be improved. Proposed is a new magnitude dividing standard, which can be combined with an actual operation line to conduct dynamic correction, and can effectively reduce objective interference in a process of weight determination, thus having higher monitoring accuracy.

IPC Classes  ?

• G01R 19/00 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof

Abstract

A power cable intelligent grounding box comprises: a cable sheath crossed interconnection protection grounding box; a signal collection terminal (2) mounted in the grounding box; a current transformer (3, 4, 5) on each of a phase line A, a phase line B, and a phase line C; an antenna (6); and an energy-obtaining current transformer (7) for power supply. The signal collection terminal (2) comprises an over-current protection module (21), a current sampling module (22), a temperature sensor (23), a humidity sensor (24), a signal processing module (25), a GPRS module (26) and a power module (27). The signal collection terminal (2) receives and processes current sampling information processed by three current transformers (3, 4, 5) by means of the over-current protection module (21) and the current sampling module (22), and temperature and humidity information transmitted by the temperature sensor (23) and the humidity sensor (24), and sends related information to a background monitoring system of the power supply department wirelessly. The power cable intelligent grounding box is convenient to implement, low in cost and easy to popularize. In use, the power cable intelligent grounding box can effectively improve validity and accuracy of cable online monitoring and ensure the safety of a power supply grid.

IPC Classes  ?

• G01R 31/08 - Locating faults in cables, transmission lines, or networks
• G01R 19/00 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof

Abstract

Disclosed is an online real-time loop closing method based on integration of a main network and a distribution network. The online real-time loop closing method is characterized by comprising the following steps: S01: conducting network modeling; S02: conducting main network and distribution network measuring and reading and acquiring initial section data of loop closing load flow calculation; S03: conducting loop searching and phase verification; S04: conducting loop closing load flow calculation; and S05: conducting loop closing risk evaluation. Models and real-time data are online acquired in an EMS and a DMS respectively, calculation results are interacted through an information exchange bus, and then loop closing load flow calculation units or programs running on a PAS server of the DMS and a PAS server of the energy management system can simultaneously acquire the models and the data of the main network and the distribution network for alternate iterative calculation, so that calculation accuracy is greatly improved, and the loop closing load flow calculation units or programs can conveniently run and can be conveniently maintained.

IPC Classes  ?

• H02J 3/00 - Circuit arrangements for ac mains or ac distribution networks

Abstract

A method for managing and controlling a system configuration document (SCD) in an intelligent substation comprises: a user presentation module performing integrity check on an SCD document, and submitting the SCD to a management and control kernel; the management and control kernel parsing the SCD to check the SCD; the management and control kernel returning a result to the user presentation module, and continuing with the following steps when the check succeeds; the user presentation module invoking a CRC check digit computation module to return the result to the user presentation module; the user presentation module invoking a virtual terminal graphic generation module, and returning the result to the user presentation module; and the user presentation module generating release information of the SCD, and storing and filing the SCD, the CRC check digit, a virtual terminal graphic document together. The method can accomplish uploading, checking, generation of release information, and storage and filing for an SCD, thereby implementing global management and control of an SCDof an intelligent substation.

IPC Classes  ?

• G06Q 50/06 - Energy or water supply

Abstract

An automatic direct-current magnetic bias compensation device of a measurement winding of a current transformer. Two independent windings, i.e. a measurement winding and a compensation winding, are provided on a measurement iron core of a current transformer, and the compensation winding is connected to the direct-current magnetic bias compensation device. The automatic direct-current magnetic bias compensation device is used for detecting the size and phase of even harmonic components in output signals of a secondary side measurement winding of the current transformer, and therefore a direct-current source is controlled to inject a reverse direct-current current of a corresponding amount into the secondary side compensation winding of the current transformer as the compensation current, the compensation current generates a magnetic field in the compensation winding, and the magnetic field generated by a primary side direct current is offset, so that automatic on-line compensation of the direct-current magnetic bias of the current transformer is realized. This device has an obvious automatic compensation effect on the direct-current magnetic bias of a current transformer.

IPC Classes  ?

• G01R 35/02 - Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating

Abstract

A dynamic recognition method for a network device topology of an intelligent transformer substation network device based on MAC address matching, comprising: obtaining a table of a corresponding relationship between an IP address of an intelligent electronic device/a multicast address of an IED and an IED name by parsing an intelligent transformer substation configuration file, and obtaining a table of a corresponding relationship between an IP address of the IED/the multicast address of the IED and a MAC address by parsing a section data packet; acquiring a MAC address forwarding table of a switch through a simple network management protocol; and matching a two-dimensional table by taking the MAC address as a foreign key to generate a switch port-IED name table, completing the topology recognition on the switch and the IED connected thereto, and conducting patterning display.

IPC Classes  ?

• H04L 29/12 - Arrangements, apparatus, circuits or systems, not covered by a single one of groups characterised by the data terminal
• H04L 12/24 - Arrangements for maintenance or administration

Abstract

A method for intelligently comparing information about primary and standby channels of an electric power scheduling automation system. The method comprises the following steps: step 1, acquiring information about primary and standby channels in the same set time period in a manner of network mirroring port monitoring; step 2, conducting protocol analysis on the acquired information about the primary and standby channels in real time, forming events of the primary and standby channels and saving the events of the primary and standby channels in a database; and step 3, automatically comparing the events of the primary and standby channels to generate a comparison result, and if the comparison result is exceptional, triggering to generate an alarm event, saving the alarm event in the database, and displaying the alarm event in real time. By means of the method, the usability of channel data can be greatly increased, and exceptional channel data can be found in time, so that the thermal standby state of a standby channel is actually a state capable of being used at any time, thereby providing a powerful guarantee for increasing the secure and stable operation of the electric power scheduling automation system.

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 12/24 - Arrangements for maintenance or administration

Abstract

Disclosed is a method for testing a station level of an intelligent substation. The method comprises the following steps: (1) matching, by means of a matching module, an operation mode and a test mode of an intelligent electronic device from an operation mode bank according to a model file of the bay level intelligent electronic device, storing information about the operation mode and the test mode into a mode memory, and notifying a simulation device operation module and a test management and control module; (2) the simulation device operation module constructing a simulation device conforming to an IEC 61850 communication specification by loading the operation model; and (3) the test management and control module implementing standardized output of test data of a station level simulation device by loading the test mode, and generating a corresponding test report. The method for testing a station level of an intelligent substation in the present invention can greatly reduce the workload of manual check and can strongly ensure the normalization of a test process and the correctness of a test result.

IPC Classes  ?

• H04L 12/26 - Monitoring arrangements; Testing arrangements

Abstract

A device applied to coordination control over an SVG and an APF comprises an industrial personal computer. The industrial personal computer is connected with a three-phase voltage collecting device and a three-phase current collecting device through a PCI slot respectively; the three-phase current collecting device is connected to a power grid through a voltage regulating circuit and a PT in sequence; the three-phase current collecting device is connected to the power grid through a current regulating circuit and a CT in sequence; the industrial personal computer is connected with the SVG and the APF. The device applied to coordination control over an SVG and an APF can be used for performing coordination control over various DFACTS devices such as the SVG and the APF, the problem of function matching of various DFACTS devices can be effectively solved, the working performance of each device is improved, and a comprehensive compensation effect on the electric power quality problems such as instantaneous voltage interruption, harmonic voltage and current, voltage fluctuation and flickering, and voltage unbalance is improved.

IPC Classes  ?

• H02J 3/18 - Arrangements for adjusting, eliminating or compensating reactive power in networks

Abstract

A method for on-line calculation of a power flow of a power distribution network. Decoupling is performed on calculation of a power flow of a power distribution network, a node voltage is broken up into a positive-sequence voltage, a negative-sequence voltage, and a zero-sequence voltage, then the positive-sequence voltage, the negative-sequence voltage, and the zero-sequence voltage are replaced with a positive-sequence excitation source, a negative-sequence excitation source, and a zero-sequence excitation source, and positive-sequence power flow calculation, negative-sequence power flow calculation, and zero-sequence power flow calculation are performed in sequence; nodes of the power distribution network are classified, and node numbering is performed on the classified nodes; and power flow calculation is performed on the entire power distribution network; a distribution transformer intelligent terminal acquires a voltage on a 10 kV side of a power transformer, a voltage on a low-voltage side of the distribution transformer, a voltage of an installation point of a 10 kV line capacitor, and a voltage on a wire outlet side of a 10 kV series transformer by using a wireless GPRS, and on-line real-time calculation is performed on the power flow of the power distribution network. By using the method, on-line calculation is implemented and an accurate calculation result can be obtained, problems are solved that three-phase asymmetry exists in a 10 kV power distribution network and both a three-phase three-wire system and a three-phase four-wire system exist for a 10 kV distribution transformer, and problems of difficulties in a large sampling area and a large sampling amount are avoided.

IPC Classes  ?

• H02J 3/00 - Circuit arrangements for ac mains or ac distribution networks

Abstract

A relay protection control method for a serial connection between a reactor and a 35 kV transformer at a 500kV substation, comprising the following control steps: step 1, adding a 35 kV impedance protective device to a backup protective device at the 35 kV side of the 500 kV transformer, the impedance protective device comprising direction/deviation phase-to-phase distance protection and direction/deviation grounding distance protection; step 2, the direction/deviation phase-to-phase distance protection and the direction/deviation grounding distance protection point to the impedance of the 35kV bus, and are adjusted according to the sensitivity required by various types of inter-phase short circuits after the 35 kV transformer is connected to a reactor in series; step 3, when inter-phase short circuit occurs after the 35 kV transformer is connected to a reactor in series, a breaker at the 35 kV side or other sides of the 500 kV transformer trips for a preset time delay to remove the fault. The method can provide relay protection against various types of inter-phase short circuits after the 35 kV transformer is connected to a reactor in series at a 500 kV substation.

IPC Classes  ?

• H02H 7/04 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers

Abstract

Disclosed is a method for forecasting residential quarter short-term load, characterized by comprising: step 1: reading history sample data, and performing data screening on the history sample data; step 2: obtaining a load influencing factor coefficient set; step 3: constructing a training sample set and a forecasting sample set for neural network load forecasting; step 4: performing influencing factor separating processing on the training sample set to obtain a trained neural network; step 5: performing influencing factor separating processing on the forecasting sample set, and using a result obtained after processing as input of the trained neural network, to obtain a corresponding output result; and step 6: performing influencing factor adding processing on the output result to obtain load forecasting data of a week in the future. The present invention solves problems that residential quarter load data is small, has large fluctuation, and has lots of influencing factors, and improves the accuracy and operation speed of residential quarter load forecasting.

IPC Classes  ?

• G06F 17/30 - Information retrieval; Database structures therefor

Abstract

A GIS field oscillation type impulse withstand voltage test waveform adjustment system and a method. The method comprises the following steps: calculating a capacitance value of a tested GIS (S101); determining a test waveform parameter value (S102); calculating a test loop parameter based on the capacitance value of the tested GIS and the required test waveform parameter value (S103); establishing a test line based on the loop parameter obtained from calculation (S104); and using the established test line to perform an oscillation type impulse withstand voltage test on the GIS (S105). The waveform adjustment method can obtain a parameter of the test waveform before performing a formal high voltage test, avoiding blindness of the test; and a numerical calculation method is used to calculate the test loop parameter, providing advantages of high calculation accuracy and facilitating implementation. The system has advantages of easy to use and facilitating field implementation.

IPC Classes  ?

• G01R 31/12 - Testing dielectric strength or breakdown voltage
• G01R 1/28 - Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform

Abstract

A progressive scheduling method for an intelligent power distribution system. Automated and self-adaptive characteristics are provided from collection and analysis of data to generation of scheduling measures. Without any human intervention, real-time data, historic data, planning data, and operational data are coordinated automatically. Based on long-term regular variations and short-term random variations of a load, and taking into account temporary load power supply and repair needs, a multistage-progressive and multiple-time-scale optimized scheduling method is formed for scheduling an intelligent power distribution system comprising elements such as a distributed power supply, a micro-grid, an energy storage apparatus, and an electric vehicle charging/discharging facility. This implements coordinated operation of a grid, a power supply, and a load resource and ensures continued safeness and reliability and optimal and highly efficient operation of the intelligent power distribution system.

IPC Classes  ?

• G06Q 10/04 - Forecasting or optimisation specially adapted for administrative or management purposes, e.g. linear programming or "cutting stock problem"

Abstract

A global optimization scheduling strategy library based on a timescale, which is guided by an indicator system and a scheduling mode, and which relies on research results of various sub-projects, respectively gives out the adjustment and optimization means of long term, medium term, short term, ultra short term and real-time optimization sub-objectives according to the time scale, and comprehensively applies new elements of a grid such as a distributed energy source, a micro-grid, an energy storage device and a nonlinear load in a power distribution network, so that the operating efficiency of an intelligent power distribution network can be increased.

IPC Classes  ?

• H02J 3/00 - Circuit arrangements for ac mains or ac distribution networks

Abstract

The invention relates to a detection method for communication states of an IEC104 protocol of a dispatching automation system. The detection method comprises: (1). in the dispatching automation system, when the IEC104 protocol is used for communication, determining states of IP addresses of an opposite party, automatically selecting an IP address in a normal state to initiate establishment of a TCP/IP link; (2). determining whether a monitor service of a 2404 network port is started for each IP address in the normal state; (3) sending a testing frame message of the IEC104 protocol in each normal TCP/IP network link with a network port number being 2404, and determining, according to a response packet of the opposite party, whether each communication link of the IEC104 protocol is normal; and (4). storing the foregoing states in a database, and the dispatching automation system comprehensively determining, according to the states, an operation state of each IEC104 communication link. The present invention provides a unified and complete system platform for a user, so that the user can comprehensively learn various communication states of the IEC104 protocol on any node of the dispatching automation system, and the system platform is easy to maintain and convenient to operate.

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

Abstract

Disclosed is an automatic modeling analysis method for an over-voltage level of a switching reactor of a vacuum circuit breaker. The automatic modeling analysis method comprises: 1) establishing an analysis model for an over-voltage level of a switching reactor of a vacuum circuit breaker; 2) managing the analysis model; 3) calculating the over-voltage level; and 4) outputting and displaying. In the automatic modeling analysis method for an over-voltage level of a switching reactor of a vacuum circuit breaker of the present invention, a small number of parameters are set and a calculation condition is selected, so that an analysis model can be established automatically, and an analysis platform is provided for an over-voltage level of a switching reactor of a vacuum circuit breaker. The automatic modeling analysis method has a desirable man-machine interaction interface, is convenient to operate, plays a major role in the calculation and analysis of an over-voltage level of a switching reactor of a vacuum circuit breaker, and has promising application prospects.

IPC Classes  ?

• G06F 17/50 - Computer-aided design

Abstract

The invention provides an automatic mapping method for a distribution network based on logical layout. The method includes: (1) pretreating a model of the distribution network model by analyzing it, and partitioning and striping the distribution network model to generate a plurality of partial models; (2) analyzing an automatic mapping algorithm to be utilized by comparing a distribution network graph obtained by the algorithm with the distribution network model; (3) achieving automatic layout of the partial models or the whole distribution network model on the basis of analysis of the automatic mapping algorithm to be utilized; and (4) analyzing and treating the automatic layout to achieve the generation of the distribution network graph with a desired practical effect.

IPC Classes  ?

• G06F 17/50 - Computer-aided design
• H02J 3/00 - Circuit arrangements for ac mains or ac distribution networks

Abstract

A method for waveform-analysis-based vacuum circuit breaker chopping current suppression, comprising: extracting a waveform generated when a vacuum circuit breaker switches off a reactor, using a Kaiser window to analyze and process the wave filtration, calculating equivalent capacitance from the waveform oscillation period, and calculating capacitance parameters and resistance parameters of a resistance-capacitance suppression device, effectively suppressing vacuum circuit breaker chopping current and restriking overvoltage, thus avoiding violent electromagnetic oscillation of the equivalent loop within a shunt reactor.

IPC Classes  ?

• H02H 9/04 - Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage

Abstract

Disclosed is a heavy AC current calibration system based on the self-calibration principle of the coefficient of mutual induction of a hollow coil, the heavy AC current calibration system comprising a current carrying wire, a heavy current sensing unit featured by use of an iron core coil and a hollow coil as standard current sensors, a bypass device for cutting off the iron core coil in case of a heavy current, a signal conditioning unit, a data acquisition unit, and a calibration platform; the input end of the current carrying wire is provided with a connection terminal A while the output end is provided with a connection terminal B, and an electric connection hole is arranged between the input end and the output end; the iron core coil is sleeved on the current carrying wire and located between the connection terminal A and the electric connection hole; the hollow coil is sleeved on the current carrying wire and located between the electric connection hole and the connection terminal B, the outer side of the hollow coil is covered with a shield, and meanwhile, the signal conditioning unit is also located inside the shield. The system is capable of realizing heavy AC current calibration with high precision.

IPC Classes  ?

• G01R 35/02 - Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating

Abstract

A digital power source based on an IEC61850-9 sampling value and an implementation method thereof. The digital power source comprise a central processing unit, a temperature-compensation crystal oscillator, a packet sending module, and a pulse receiving module, wherein the central processing unit comprises a standard calculation module, a packet control module, and an error calculation module. Standard electric energy and electrical measurement parameters are obtained for a packet sent by the packet sending module through the standard calculation module, and are compared with electric energy obtained by the pulse receiving module or another electrical parameter receiving module to obtain a measurement value error. The digital power source can accurately simulate the field situation, provide a function of simulating and testing packets of various types on field, provide good detection means for a digital electric energy meter or other digital secondary measurement devices to complete detection for the digital electric energy meter or other digital secondary measurement devices under the actual working conditions, thereby ensuring measurement accuracy and reliability of the digital electric energy meter or other digital secondary measurement devices under the actual working condition.

IPC Classes  ?

• G01R 35/04 - Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
• G01R 22/10 - Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques

Abstract

An intelligent checking system for a backup power supply automatic switching apparatus comprises: a power supply module (1); a control module (2) used for logical control; a voltage output module (3) used for outputting an analogue voltage and a current output module (4) used for outputting an analogue current; a signal feedback module (5) used for sampling output voltage and current signals; a simulated circuit breaker group (6); an auxiliary relay (7); a USB interface (8) used for communication; a keyboard (9) used for information input; a display module (10) used for information interaction and real-time interface display; an interface module (11) used for facilitating the plugging and connection of a wire; an indicating lamp (12) used for displaying an working state; and a computer (13) used for providing an operation interface, being provided with a checking database, and controlling overall checking. The wiring of the system is convenient and efficient, the system can conveniently display an operation interface and related information, the operation is visual, simple and efficient, and the overall checking efficiency is increased; the system can more comprehensively check a to-be-checked backup power supply automatic switching apparatus, the test precision is high, and the impact of an artificial operation on a test result is avoided.

IPC Classes  ?

• G01R 31/00 - Arrangements for testing electric propertiesArrangements for locating electric faultsArrangements for electrical testing characterised by what is being tested not provided for elsewhere
• H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over

Abstract

A portable single-phase air bypass switch for live line work in a distribution network, comprising a shell assembly (1), a locating assembly (2), a conductive loop assembly (3), a clutch assembly (4), a switch-on assembly (5) and a switch-off assembly (6). The shell assembly (1) comprises a main sleeve barrel (11), an insulating sleeve pipe (12), a flange sleeve (13) and a bottom cover (14); the locating assembly (2) comprises a locating nut (21), a locating frame (22) and a locating column (23); the conductive loop assembly (3) comprises a conductive end cover (31), an upper conductive rod (32), a pressing sleeve (33), a connecting nut (34), a conductive sleeve pipe (35), a fixed contact (36), a moving contact (37) and a lower conductive rod (38); the clutch assembly (4) comprises a clutch (41), a clutching ring (42) and a clutching sleeve pipe (43); the switch-on assembly (5) comprises a switch-on energy-storage draw rod (51), a switch-on energy-storage draw ring (52), a switch-on spring (53), a switch-on locating pin (54), a switch-on release draw ring (55) and an inner sleeve pipe (56); and the switch-off assembly (6) comprises a small shaft (61), a switch-off spring (62), a stop block (63), a switch-off energy-storage shaft (64), a connecting rod (65), a switch-off energy-storage pressing head (66), a switch-off locating pin (67) and a switch-off release draw ring (68). The present invention integrates a quick switch-off function and a quick switch-on function into a whole, thereby solving the technical problem of instantaneous arc extinguishing in the operation of an overhead line, a power cable and a hybrid line bypass in a distribution network, so that the coverage rate of live line work is increased, and the security is good.

IPC Classes  ?

• H01H 3/30 - Power arrangements internal to the switch for operating the driving mechanism using spring motor

Abstract

Disclosed are a method and device for an automatic test of a relay protection function of an intelligent substation. The test of the relay protection function of the intelligent substation is divided into a plurality of minimum test modules, and a test sequence is generated. In the test process, voltage and current data are output to a tested device in sequence in accordance with the test sequence; then, a response of the tested device is monitored; and the entire test process is recorded for checking the performance of the tested device, simplifying the test process and improving the automation degree of the test. The present invention has a good application prospect.

IPC Classes  ?

• G01R 31/00 - Arrangements for testing electric propertiesArrangements for locating electric faultsArrangements for electrical testing characterised by what is being tested not provided for elsewhere

Abstract

Provided are a system and a method for controlling an Ethernet interface. The system comprises: a frame data control interface module (5): adaptively opening a data buffer and storing corresponding data information according to different data types of a sampling value frame data or another common frame data; an adaptive μS-level high-precision hardware time-sequence control module (6): adaptively generating a frame publishing time-sequence logic control mechanism according a packet type, content and a high-precision time-sequence requirement configured by a system, and selecting and sending the published frame data content to an IP core-based Ethernet MAC controller by using a high-precision timed interruption-based method of "timed interruption of triggering by hardware, parallel operation of multiple tasks, hardware time delay, and packet frame published"; and a high-speed Ethernet communications interface module (10): publishing an Ethernet packet frame in a high-speed way according to content of a packet assembly of an Ethernet MAC controller. By means of the present invention, the problem is solved that a time interval, a jitter and time delay of sending a sampling value frame of an intelligent substation are great.

IPC Classes  ?

• H04L 12/70 - Packet switching systems

Abstract

A method for detecting residual magnetism of a current transformer (CT) based on small-signal slope mapping. The derivative (I) of a magnetic flux (Øb) of an initial operating point (iµ=0) to an exciting current (iµ) is calculated by secondarily (S1, S2) applying a small voltage (u) signal to the current transformer (CT), and the residual magnetism (Ør) of the iron core of the current transformer (CT) is determined by using a current transformer (CT) iron-core magnetization curve (Øb-iµ) to perform slope mapping. The method enables a current transformer (CT) to generate residual magnetism of different magnitudes by magnetizing an actual current transformer (CT). The validity of the present residual-magnetism detection method and theory and the practicability of a detection system platform are evaluated, and the detection result shows that the magnitude of the residual magnetism (Ør) of an iron core of a tested current transformer (CT) can be rapidly and accurately reflected by using the detection platform.

IPC Classes  ?

• G01R 33/12 - Measuring magnetic properties of articles or specimens of solids or fluids

Abstract

A measurement device and a measurement method compatible with an electric energy meter and an electricity consumption information collection terminal. Each detection position of the measurement device can automatically adjust a test wiring position and an electric signal property according to an object to be detected, which is flexibly configured according to a test requirement. The wiring adopts an automatic crimping means. The device can effectively improve the rate of device utilization and reduce production costs.

IPC Classes  ?

• G01R 35/04 - Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current

Abstract

摘要本发明涉及—种智能配电网高效运行评估方法，包括下述步骤：(1)确定边界条件；(2)明确服务对象；(3)构建评估指标体系；所述评估指标体系包括配电网安全性指标、配电网可靠性指标、配电网经济性指标、配电网运行优质性指标和配电网智能性指标五个指标；(4)确定单项评估指标数值；(5)单项评估指标评分：(6)评估指标体系综合评分；(7)根据步骤(6)的评估指标体系综合评分，判断配电网是否达到高效运行。本发明的智能配电网高效运行评估方法具有较广的适用范围，能够全面评估智能配电网的运行状态，评估结果将为电网调度、规划以及运行管理人员的决策工作提供重要的依据。

IPC Classes  ?

• G06Q 10/00 - AdministrationManagement

Abstract

The present invention relates to a method for detecting an island of a distributed energy source of a safety automatic control system, including: a control terminal mounted at a distributed power supply side performing synchronous frequency measurement on a distributed power supply, making a time mark, and sending the synchronous frequency measurement data to a utility grid side via a 3G network; a control terminal mounted at the utility grid side performing synchronous frequency measurement on a utility grid, and making a time mark, while receiving the synchronous frequency measurement data sent from the distributed power supply side; the control terminal mounted at the utility grid side calculating a frequency difference of the utility grid side and the distributed power supply side according to the time marks, and if the frequency difference exceeds a set operating value, sending a trip command to the distributed power supply side after a specified time delay; if the frequency difference exceeds a set start value but does not exceed the set operating value, calculating a frequency difference energy integral value Kdf; and if the Kdf exceeds a frequency difference energy integral set value, sending a trip command to the distributed power supply side.

IPC Classes  ?

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

Abstract

Disclosed are a heat shield and a method for live-working on a heat-resistant conductor with the heat shield, the heat shield comprising a heat shield main body (1) of a "U"-shaped cross section, and a pair of "U"-shaped hooks (2) provided on the inner wall of two ends of the heat shield main body, wherein insulation handles (4) are connected at the lower end of the hooks. When the live-working on the heat-resistant conductor is carried out, a thermally insulating protection can be provided for an operator so as to prevent the operator under the influence of high temperature and keep the electric potentials of the operator and the high temperature conductor equal, so that no harm comes to the human body. The heat shield has a simple structure and good safety performance. The method for carrying out live-working on a heat-resistant conductor utilizing the heat shield has simple operation, and the working processes and working time can be saved.

IPC Classes  ?

• H02G 1/02 - Methods or apparatus specially adapted for installing, maintaining, repairing, or dismantling electric cables or lines for overhead lines or cables

Abstract

Disclosed are a passive optical fiber switch of an intelligent transformer substation and a safety measure isolating method thereof. A passive optical fiber switch comprises an optical fiber collimator. At two ends of the optical fiber collimator, two optical fiber adapters are partially embedded in the optical fiber collimator. The optical fiber adapters are connected to optical fibers. A blocking plate is arranged in the optical fiber collimator. The blocking plate divides the optical fiber collimator into a left part and a right part, and a trigger switch is connected to the blocking plate. The present invention overcomes the defect of poor visibility of a soft pressing plate in safety measure isolation, and eliminates a risk of error wiring caused by plugging and pulling optical fibers for safety measure isolation and a hidden risk of damage to an optical fiber interface. No operation of an electronic device is needed, so as to eliminate the influence of interference from an external electromagnetic field, and provide high reliability. Same as a safety measure method of a conventional transformer substation, an obvious disconnection point is provided. The safety measure isolating method is simple and convenient to implement and restore, satisfies safety requirements of conventional repair and maintenance, and improves working efficiency, reliability and safety.

IPC Classes  ?

• G02B 6/35 - Optical coupling means having switching means

Abstract

A power transformer iron core looseness fault diagnosis and preliminary fault location system and method, which belong to the technical field of intelligent diagnosis of power transformer faults. The fault diagnosis and preliminary fault location system consists of a vibration sensor, a signal acquisition instrument and a computer system. The fault diagnosis and preliminary fault location method measures a vibration signal using three vibration sensors which are mounted on the top surface of a transformer, and performs Fourier transform analysis on the signal to obtain iron core looseness fault characteristic quantities, which are a 50 Hz component, a 150 Hz component and a 300 Hz component, respectively, with the 300 Hz component as a main characteristic quantity. When the amplitudes of these components at some location are increased to a fixed value, it suggests that an iron core looseness fault occurs at that location, and by comparing the difference among the three location signal characteristic quantities, fault location can be carried out. The system can accurately reflect the fault characteristics of iron core looseness and can effectively detect a power transformer iron core looseness fault.

IPC Classes  ?

• G01H 17/00 - Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the other groups of this subclass

Abstract

Disclosed is a real-time online monitoring device for an electromagnetic environment, which comprises a main controller (5), an acquisition unit (1) for power frequency electromagnetic data, a time synchronization unit (2), a data processing unit (3) and a power system (4); the acquisition unit (1) for power frequency electromagnetic data comprises a high-accuracy power frequency electromagnetic sensor (101), a high-capacity battery (102), a power managing module (103) which comprises a DC/DC converter (103-1) and a unilateral diode (103-2), and at least two physical isolators (104); the physical isolators (104) are connected successively, with an input end thereof connected to the power system (4) and an output end connected to the positive pole of the unilateral diode (103-2). The negative pole of the unilateral diode (103-2) is connected to the DC/DC converter (103-1) and the high-capacity battery (102), and the output end of the DC/DC converter (103-1) is connected to a power input end of the high-accuracy power frequency electromagnetic sensor (101), which high-accuracy power frequency electromagnetic sensor (101) is also connected to the main controller (5) and the high-capacity battery (102). The device can achieve a long-period power supply and automatic charging for the high-accuracy power frequency electromagnetic sensor, and can effectively shield the effect on the measuring result of the switching-in of power lines.

IPC Classes  ?

• G01R 29/08 - Measuring electromagnetic field characteristics
• H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Abstract

Disclosed is an IEEE1588-based sampled value multi-interface synchronization system, comprising a universal IEEE1588 clock interface, having a communication receiving module with multiple IEEE1588 slave clock interfaces, wherein the number of slave clocks may be automatically increased according to the number of master clocks. The universal multiple sampled value synchronization interface comprises a communication interface capable of being networking connected to a combination unit, and comprises an Ethernet data receiving module, a software sampling interpolation module, a phase-lock loop (PLL) module, a frequency tracking module and a multi-interface sampled value synchronization module. The present invention is applicable to a digital relay protection device, a power meter, a power quality monitoring device and other electronic apparatuses that require sampling synchronization, so as to provide a convenient solution to the problem of the dependence of current sampled value networking transmission on a global sampling synchronization source.

IPC Classes  ?

• H04L 7/00 - Arrangements for synchronising receiver with transmitter

Abstract

A harmonic wave protecting method for a capacitor bank, which uses a harmonic wave protecting device for the capacitor ban including: a CPU unit (20), a current and voltage sampling unit (21) and a protecting device (23). The CPU unit (20) obtains the effective value of fundamental current It and the effective value of harmonic wave current In in the capacitor bank, and then calculates the true effective value of current I in the capacitor bank according the following equation (I), wherein kn is the nth harmonic wave factor, n is the harmonic order. The CPU unit (20) controls the protecting device (23) to cut off the capacitor bank when ≤1.3IN, wherein IN is the rated current of the capacitor bank.

IPC Classes  ?

• H02H 7/16 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for capacitors