Abrégé

The invention relates to a method for classifying electrical sheet that is used to produce an electrical machine and that is available in the form of a strip roll (1), characterized in that: a magnetic flux that changes over time and that causes a shape change of the strip roll (1) and magnetic losses is produced in the strip roll (1) by means of an excitation winding (2) fed by a feeding device (5); the shape change and/or the magnetic losses are measured by means of a measuring device (3, 6, 23) and the measurement signal (21, 22, 24) obtained is fed to an evaluation device (4); and the evaluation device (4) categorizes the electrical sheet in regard to noise emission and/or magnetic losses using the measurement signal (21, 22, 24).

Classes IPC  ?

• G01R 33/04 - Mesure de la direction ou de l'intensité de champs magnétiques ou de flux magnétiques en utilisant le principe du déclenchement périodique de flux
• G01N 27/90 - Recherche ou analyse des matériaux par l'emploi de moyens électriques, électrochimiques ou magnétiques en recherchant des variables magnétiques pour rechercher la présence des criques en utilisant les courants de Foucault
• G01N 29/14 - Recherche ou analyse des matériaux par l'emploi d'ondes ultrasonores, sonores ou infrasonoresVisualisation de l'intérieur d'objets par transmission d'ondes ultrasonores ou sonores à travers l'objet utilisant des techniques d'émission acoustique
• B06B 1/08 - Procédés ou appareils pour produire des vibrations mécaniques de fréquence infrasonore, sonore ou ultrasonore utilisant l'énergie électrique fonctionnant par magnétostriction

Abrégé

The invention relates to a method for reducing the noise emission of a transformer, the transformer tank of which is filled with liquid and the tank wall of which vibrates during operation, characterized by the sequence of the following method steps: a.) detecting natural frequency values of the tank wall for at least one excitation frequency; b.) determining at least one eigenmode for which the vibration of the tank wall is composed at an excitation frequency, from the natural frequency values, wherein areas of large curvature are determined on the tank wall; c.) arranging at least one vibration loading device in at least one of said areas; d.) controlling the at least one vibration loading device by means of a control device in order to counteract the vibration of the tank wall.

Classes IPC  ?

• H01F 27/33 - Dispositions pour amortissement du bruit
• G10K 11/16 - Procédés ou dispositifs de protection contre le bruit ou les autres ondes acoustiques ou pour amortir ceux-ci, en général
• G10K 11/178 - Procédés ou dispositifs de protection contre le bruit ou les autres ondes acoustiques ou pour amortir ceux-ci, en général utilisant des effets d'interférenceMasquage du son par régénération électro-acoustique en opposition de phase des ondes acoustiques originales

Abrégé

The invention relates to a device for disassembling a fitting (1) attached to a connecting port (11) of a tank (12), particularly a transformer tank filled with transformer oil, comprising: a drain stopper (2) made of an elastic material; an actuating device (17) by means of which the drain stopper (2) can be inserted through the fitting, opposite an outflow direction, when the fitting is opened, and can be brought into a closure position (19) in an inserted position, in which the drain opening (21) of the connecting port (11) is tightly closed.

Classes IPC  ?

• F16K 7/10 - Dispositifs d'obturation à diaphragme, p. ex. dont un élément est déformé, sans être déplacé entièrement, pour fermer l'ouverture à élément gonflable
• F16K 7/20 - Dispositifs d'obturation à diaphragme, p. ex. dont un élément est déformé, sans être déplacé entièrement, pour fermer l'ouverture à organe de fermeture solide compressible
• F16K 43/00 - Moyens de fermeture auxiliaire des soupapes, pouvant prendre à leur compte, en cas de réparation de la soupape, p. ex. un regarnissage des rondelles, la fonction des moyens normaux de fermetureDispositifs pour le remplacement temporaire des parties de soupapes dans le même but
• F16L 55/134 - Moyens pour arrêter l'écoulement dans les tuyaux ou manches en introduisant dans le tuyau un élément expansible in situ introduits axialement dans le tuyau ou la manche l'obturateur étant un bouchon fixé par déformation radiale du joint d'étanchéité au moyen d'une garniture gonflable

Abrégé

The invention relates to a winding arrangement for a transformer or for a throttle, having an annular winding cover part (6) disposed on the front face of a winding (5), wherein a side surface (22) of the winding cover part (6) overlaps a front surface (10) of the winding (5), wherein the annular winding cover part (6) is designed to be magnetically conductive at least in a partial area (21) and comprises a convex side surface (23) facing away from the winding (5).

Classes IPC  ?

• H01F 27/36 - Blindages ou écrans électriques ou magnétiques

Abrégé

The invention relates to a continuously transposed conductor for a winding of an electric machine, particularly for a transformer winding, formed of individual, flat strands (20) insulated from each other and stacked in adjacently disposed strand stacks (3, 4), wherein strands (21) at one end (5, 6) of a strand stack (3, 4) are offset in an offset segment (22, 23), producing a change of the strand (21) from one strand stack to the other strand stack, wherein an insulating element (11, 12) is disposed in each offset segment (22, 23) between adjacent wide surfaces of the strand (21) and the strand stack (3, 4).

Classes IPC  ?

• H02K 3/14 - Enroulements caractérisés par la configuration, la forme ou le genre de construction du conducteur, p. ex. avec des conducteurs en barre disposés dans des encoches avec des conducteurs transposés, p. ex. des conducteurs torsadés
• H01F 27/32 - Isolation des bobines, des enroulements, ou de leurs éléments

Abrégé

The invention relates to a transformer core having a stray field shield, comprising at least one core leg (2', 2'', 2''') carrying a winding arrangement (13) and formed from a laminate stack (3), said laminate stack (3) being sealed by end plates (7', 7''), each end plate (7', 7'') being associated with a stray field shield (4', 4'') that comprises coated laminate plates (40', 40''), the layer planes (15) of which are disposed perpendicular to the layer planes (14) of the laminate stack (3), characterized in that the laminate plates (40', 40'') are disposed with laminate plate faces (9', 9'') pointing toward the laminate stack (3) to abut an exterior width surface (8', 8'') of an associated end plate (7', 7'').

Classes IPC  ?

• H01F 27/245 - Noyaux magnétiques fabriqués à partir de tôles, p. ex. à grains orientés
• H01F 27/36 - Blindages ou écrans électriques ou magnétiques

Abrégé

Electrical transformer with unidirectional flux compensation, characterized by the following features: a) the transformer (20) has a soft-magnetic core (4), on which, in addition to a primary and a secondary winding arrangement (1, 2), a compensation winding arrangement (3) is arranged, b) the compensation winding arrangement (3) is connected to a current control device (12, 13), which feeds a compensation current (16, 17) into the compensation winding arrangement (3) in accordance with a control signal (14, 15), which a magnetic field measurement device (30) provides from a measurement of a flux which is interlinked with a current in the primary or secondary winding arrangement, in such a way that the effect of said compensation current in the core (4) is in the opposite direction to a magnetic unidirectional flux (5).

Classes IPC  ?

• H01F 27/34 - Moyens particuliers pour éviter ou réduire les effets électriques ou magnétiques indésirables, p. ex. pertes à vide, courants réactifs, harmoniques, oscillations, champs de fuite
• H01F 27/38 - Organes de noyaux auxiliairesBobines ou enroulements auxiliaires

Abrégé

Electrical transformer with falling protection for maintenance personnel who are located on an area (6), which can be walked on, of the transformer tank cover (11) while carrying out maintenance work, with the falling protection being in the form of a protection device (2) and being produced from an electrically non-conductive polymer material.

Classes IPC  ?

• H01F 27/02 - Enveloppes
• E04F 11/18 - BalustradesMains courantes

Abrégé

Insulating material for electrical machines for insulating coiled windings, having a carrier material and adhesive coatings on the front and back of the carrier material, the adhesive coatings being mounted and aligned on the front and back of the carrier material in such a way that in the carrier material in the insulation state a direct frictional connection is developed between the adhesive coatings on the front and back.

Classes IPC  ?

• C09J 7/02 - sur supports

Abrégé

Electric transformer (1,19) in a transformer tank (2) with electric contacts and an outer shell (3) enclosing the transformer tank (2), filled with a coolant (4). The coolant (4) in the outer shell (3) can be cooled by a cooling system (20) and coupled to further components (21) in the cooling system (20). The transformer (1,19) is particularly suitable for use (10) in ocean current and tidal power stations.

Classes IPC  ?

• H01F 27/02 - Enveloppes
• H01F 27/12 - Refroidissement par huile
• H01F 27/16 - Refroidissement par eau