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 resin-impregnated fiber high-voltage insulating core, which is a main part of a high-voltage electrical appliance and is mainly used as an insulating core for passing high-voltage electricity through a grounding body, such as a wall bushing, a transformer bushing, a switch Insulation core body of casing, etc., insulation core body of primary winding of transformer, insulation core body of cable terminal head and cable intermediate head, etc. Background technique: [0002] The insulating cores of high-voltage electrical appliances in the prior art include the following types: (1) oil-paper insulating cores. For example, traditional wall bushings, transformer bushings, current transformers, etc., mostly use oil-paper insulating cores, and paper or paper with metal plates in the middle are wrapped on the carrier fluid, and the insulating cores formed are filled with (2) SF6 gas-filled insulating core; (3) Rubber insulating cor...

AI Technical Summary

Problems solved by technology

The oil-paper insulation core and the insulation core of the gas-filled medium have leakage problems, which not only pollute the environment, increase a lot of maintenance workload, but also pose 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, the accident of the cable head explosion has often been caused by the breakdown of the stress cone.

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

[0003] At present, there is a pure dry wall bushing on the market, which uses a capacitive 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, The combination with epoxy glass fiber 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 Mixed into the liquid epoxy resin, resulting in a decrease in the insulation level of the epoxy glass fiber layer, affecting the electrical performance of the device

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