Wire and foil mixedly winding coil grounding transformer

Abstract

The invention belongs to the field of dry type reactor, in particular to a wire and foil mixedly winding coil grounding transformer, comprising an iron core, a high pressure coil and a support frame, wherein, the high pressure coil comprises an inner coil and an outer coil; an airway is arranged between the inner coil and the outer coil; the inner coil adopts an enameled flat type copper wire as a conductor to wind in separated layers; a vacuum dipping glass grating plate is arranged between each layer; an inner connecting terminal which is used for coating a high pressure shrinkable tube is arranged respectively at two ends of the inner coil; the outer coil adopts copper foil to serve as the conductor to wind in separated layers; an electric insulating basal membrane is arranged between each circle; the two ends of the outer coil are provided with outer connecting terminals; the middle part is provided with a tapping terminal; and the inner side of the inner coil, the inner side and the outer side of the outer coil are respectively wound with an insulating layer. In the invention, the interturn capacitance of the transformer is distributed in equalization; and the invention has excellent electric insulating performance of no partial discharge and thunder impact resistance and is mainly applied to a 10-35 kV power grid grounding protection system.

Description

technical field [0001] The invention belongs to the field of dry-type reactors, in particular to a wire-foil mixed-wound coil grounding transformer. Background technique [0002] The grounding transformer, also known as the neutral point coupler, is a three-phase transformer (or three-phase reactor), which is used to provide an artificial, loadable neutral point for the ungrounded point of the grid system for system grounding. . The high-voltage coils of the key structure of the existing dry-type grounding transformers are all wound with copper wires. The high-voltage coils wound with copper wires have the disadvantages of uneven capacitance distribution on the coils and weak lightning impact resistance. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a wire-foil mixed-wound coil grounding transformer. The inter-turn capacitance of the transformer is evenly distributed, and has excellent ...

AI Technical Summary

Problems solved by technology

The high-voltage coils of the key structure of the existing dry-type grounding transformers are all wound with copper wires. The high-voltage coils wound with copper wires have the disadvantages of uneven capacitance distribution on the coil and weak lightning impact resistance.

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