A shielding wire grounding structure of an impregnated dry-type transformer coil

Abstract

The invention discloses a shielding wire grounding structure of an impregnated dry-type transformer coil, which includes a metal clip, a fastener combination, a coil shielding wire, an insulating T-shaped pad and an insulating flat pad. The metal clip and the fastener The combination is fixedly connected, and the coil shielding wire is fixedly connected to the fastener combination; an insulating T-shaped pad and an insulating flat pad are provided between the fastener combination and the metal clip; the fastener combination is also fixed Connected with a user ground connection; the fastener combination includes a screw rod and a plurality of nuts, and the shielded wire grounding structure of the immersed dry-type transformer coil of the present invention increases insulation between the metal clip and the fastener combination. The T-shaped pad and the insulating flat pad completely separate the fastener assembly from the metal clamp, improve the reliability of the grounding of the coil shielding wire, and ensure the safety of the immersed dry-type transformer in use.

Description

technical field [0001] The invention relates to a shielding wire grounding structure, in particular to a shielding wire grounding structure used for dipped dry-type transformer coils. Background technique [0002] Dry-type transformers rely on air convection for cooling, and are generally used in transformers such as local lighting, electronic circuits, and mechanical equipment. The current dry-type transformers mainly include impregnated and epoxy resin types. Among them, the advantages of impregnated dry-type transformers It does not need pouring equipment and molds, the production cost is low, and the flexibility of product design is also large. [0003] In actual production, in order to increase the withstand voltage strength between the primary and secondary coils of the dry-type transformer, and avoid or reduce the capacitance discharge interference between the primary and secondary coils, a shielding layer is designed to be placed between the primary and secondary coi...

AI Technical Summary

Problems solved by technology

[0004] However, for impregnated dry-type transformers, after vacuum impregnation, the surface of the metal clamp will adhere to the impregnated insulating varnish, so the insulating varnish must be completely removed, otherwise it will affect the reliability of shielding and grounding, and the removal of insulating varnish will also corrode The coating on the surface of the metal clip will cause damage to the impregnated dry-type transformer, and there will be safety hazards during use

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