Epoxy resin dipping fibre high voltage insulation core body

An epoxy resin fiber, high-voltage insulation technology, applied in the direction of insulators, transformer/inductor coils/windings/connections, etc., can solve the problems of high material prices, cable head explosion, carbon powder falling, etc., to improve the yield and Effect of service life, good electrical properties, good bond strength

Inactive Publication Date: 2003-04-09
BEIJING RUIHENG XINYUAN INVESTMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Epoxy resin dipping fibre high voltage insulation core body
  • Epoxy resin dipping fibre high voltage insulation core body
  • Epoxy resin dipping fibre high voltage insulation core body

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0038] Taking the high-voltage insulating core body of 110kV, 1000A wall bushing as an example, the manufacturing steps of the epoxy resin fiber-impregnated high-voltage insulating core body of the present invention are illustrated:

[0039] a. Select a conductive rod with a diameter of φ30 and put it into a high-resistance metal tube with an outer diameter of φ49 and an inner diameter of φ42. One end is fixed with a metal conductive ring, and the other end is fixed with a spacer made of insulating material;

[0040] b. Heat-shrink the semi-conductive heat-shrinkable tube outside the metal tube or wrap the semi-conductive self-adhesive tape;

[0041] c. The above-mentioned workpieces are mounted on automatic special machine tools;

[0042] d. Automatically wrap the glass fiber layer with a thickness of about 3mm impregnated with epoxy resin in a clean room or in a vacuum state;

[0043] e. Wrap the capacitor plate with a thickness of about 0.15mm in the purification room. The...

example 2

[0051] Taking the high-voltage insulating core body of 110kV, 600A cable terminal head as an example again, illustrate the manufacturing steps of the high-voltage insulating core body impregnated with epoxy resin fiber of the present invention:

[0052] a. Fix the rubber tube with tires;

[0053] b. Wrap the semi-conductive self-adhesive tape on the surface of the rubber tube.

[0054] The following are the same as steps c-h of Example 1.

[0055] i. The constant force spring clamps the copper braided wire and the wire mesh of the last screen is tightly connected, and the other end of the copper braided wire is connected to the cable grounding protection box.

[0056] j. Select the part with high field strength to install the non-linear resistance paint along the axial direction.

[0057] k. Glue the silicone rubber shed on the surface of the high-voltage insulation core not covered by the connecting cylinder.

[0058] l. Take out the mold in the rubber tube, press the powe...

example 3

[0060] Taking the high-voltage insulating core body of 110kV, 600A current transformer as an example again, illustrate the manufacturing steps of the high-voltage insulating core body impregnated with epoxy resin fiber of the present invention:

[0061] a. Bend the φ50 stainless steel tube passing through the conductive rod or insulating cable into a U shape with a mould, one end of the conductive rod or insulating cable is electrically connected to the stainless steel tube, and the other end is insulated;

[0062] b. Semi-conductive heat-shrinkable tube with a thickness of 2 mm outside the metal tube;

[0063] c. Install the above-mentioned workpiece on a special machine tool. The wrapping head of this machine tool can rotate around the workpiece and can be adjusted arbitrarily in three-dimensional space.

[0064] d. The following steps are the same as in Example 1.

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B17/56H01F27/29
Inventor 黄维枢
Owner BEIJING RUIHENG XINYUAN INVESTMENT
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