Hollow composite insulator for 500-kV gas current transformer

Abstract

The invention relates to a hollow composite insulator for a 500-kV gas current transformer, in particular for a 500-kV inverted sulfur hexafluoride (SF6) gas insulating current transformer, and belongs to the technical field of transformers. The invention adopts the technical scheme that: the hollow composite insulator comprises aluminum alloy flanges (1), a silicon rubber umbrella skirt (2) and an epoxy glass silk pipe (3), wherein the epoxy glass silk pipe is wound into a cylinder by using a wet method; methyl vinyl silicone rubber is poured on the whole exterior of the cylinder and then vulcanized at a high temperature into the silicon rubber umbrella skirt; the aluminum alloy flanges are poured at the upper and lower ends of the cylinder; the silicon rubber umbrella skirt is in a shape of large and small umbrellas; a creepage distance is not less than 20,460 mm; and a flash-over distance is not less than 5,115 mm. The pollution resistance capacity of the hollow composite insulator is improved, the using requirement of the hollow composite insulator in heavily-polluted areas is met, and the hollow composite insulator is convenient to assemble and disassemble.

Description

technical field [0001] The invention relates to a hollow composite insulator for a 500kV gas current transformer, especially a 500kV inverted SF 6 A hollow composite insulator for a gas-insulated current transformer belongs to the technical field of transformers. Background technique [0002] At present, the 500kV inverted SF of the background technology 6 The maximum creepage distance of hollow composite insulators for gas insulated current transformers is 17050mm, and the maximum arc flash distance is 4263mm. Since the average diameter of the hollow composite insulator is greater than φ500mm, the diameter is relatively large, and the anti-pollution ability will be reduced. Therefore, when the user requires the creepage distance to be multiplied by a factor of 1.2 on the basis of 17050mm, the creepage distance becomes 17050×1.2= 20460mm, the arc flash distance becomes 20460 / 4=5115mm, and the hollow composite insulator in the background technology cannot meet the above req...

AI Technical Summary

Problems solved by technology

Since the average diameter of the hollow composite insulator is greater than φ500mm, the diameter is relatively large, and the anti-pollution ability will be reduced. Therefore, when the user requires the creepage distance to be multiplied by a factor of 1.2 on the basis of 17050mm, the creepage distance becomes 17050×1.2= 20460mm, the arc flash distance becomes 20460 / 4=5115mm, the hollow composite insulator of the background technology cannot meet the above needs

In addition, the hollow composite insulator in the background technology is sealed with a sealing ring and a sealant between the shell and the base. Because the sealant is a strong sealant, it has a strong bonding ability, and it is very inconvenient if it needs to be disassembled.

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