Epoxy resin dipping fibre high voltage insulation core body

Abstract

A high-voltage insulating core of epoxy resin-impregnated fiber contains a conductor set up in the center of the insulator core whose peripheral surface is wrapped alternately by an epoxy resin-impregnated fiber layer and a capacity polar plate. The epoxy resin fiber-impregnated insulator is wrapped by an umbrella shaped sheath and the capacity polar plate is made of metal mesh or carbon fiber non-woven fabric having good adhesive strength to the epoxy resin-imprengated fibre layer seldom appearing seams of separation in-between. The metal mesh or carbon fiber non-woven fabric has the performance of high-low temperature resistance and keeps stable in long term operation, avoiding carbon powder dropping or mixing into the liquid epoxy resin to guarantee its isolation ability when they are used as the condense screen in the operation of wet process winding.

Description

Technical field: [0001] The invention relates to a high-voltage insulating core body impregnated with epoxy resin, which is a main part of high-voltage electrical appliances and is mainly used as an insulating core body for passing high-voltage electricity through grounding parts, such as wall bushings and transformer bushings. , switch bushings, etc., insulation cores of transformer primary windings, cable terminals and cable intermediate heads, etc. Background technique: [0002] There are several types of insulating cores for high-voltage electrical appliances in the prior art: (1) oil-paper insulating cores. For example, traditional wall bushings, transformer bushings, current transformers, etc. mostly use oil-paper insulating cores, and the paper with metal plates in the middle is wrapped around the carrier fluid, and the insulating cores formed are packed into a tank filled with insulating oil. (2) SF6 gas-filled insulating core; (3) rubber insulating core; (4) polyte...

AI Technical Summary

Problems solved by technology

The product composed of oil-paper insulation core and gas-filled insulation core has leakage problems, which not only pollutes the environment, increases a lot of maintenance workload, but also poses hidden dangers to the safety of the power system

The stress cone of the cable terminal head can be regarded as a rubber insulating core. Although it can improve the electric field, the distribution of the electric field is not uniform enough. For many years, accidents of the cable head explosion caused by the breakdown of the stress cone have often occurred.

The PTFE film insulation core has made great progress, with good safety performance and small maintenance workload, but the material price is high, which is not conducive to vigorous promotion

[0003] At present, there is a pure dry wall bushing on the market, which uses a capacitor core insulator composed of glass fiber dipped in epoxy resin and semi-conductive tape alternately wound. Due to the poor wettability of the semi-conductive tape, it is different from The combination of epoxy glass filaments is not tight enough, and it is easy to have a layer gap between adjacent epoxy glass fiber layers; moreover, when using a semi-conductive tape as a capacitive screen, during the wet winding process, sometimes carbon powder falls or mixes In the liquid epoxy resin, the insulation level of the epoxy glass fiber layer is reduced, which affects the electrical performance of the equipment

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