Air-buffer-chamber-included explosion-proof bushing for ultra/high-voltage gas insulated transformer

Abstract

The invention, which belongs to the field of the electrical appliance insulation structure design and optimization design of ultra / extra-high-voltage AC and DC power transmission equipment, particularly relates to an air-buffer-chamber-included explosion-proof bushing for an ultra / high-voltage gas insulated transformer. The explosion-proof bushing comprises a gas insulated bushing, an isolated airbuffer chamber connecting the gas insulated bushing with a transformer oil tank, and a shielding ring arranged at the end portion of the bushing. Insulating isolated supports are installed at the twoends of the isolated air buffer chamber. When the insulating isolated supports at the bushing side are damaged due to internal discharging of the bushing, the isolated air buffer chamber plays a rolein buffering so as to prevent the gas from entering the transformer; and entrance of the transformer oil into the faulty bushing is prevented, so that the probability of combustion and explosion of the bushing and the transformer is reduced and the safety and reliability of the bushing and the transformer are enhanced.

Description

technical field [0001] The invention belongs to the field of electrical insulation structure design and optimization design of super / ultra-high voltage AC and DC power transmission equipment, and in particular relates to an explosion-proof bushing of an ultra / ultra-high voltage gas-insulated transformer with a buffer gas chamber. Background technique [0002] Bushing failure is one of the important causes of transformer fires. Although the probability of transformer bushing fires is low, once a fire occurs for some reason, it often causes great damage to the transformer, and even causes damage to adjacent transformers and other electrical equipment. damage, seriously endangering the safe and stable operation of the substation. In the previous cases of transformer fire accidents, the discharge of the bushing tie rod system, the discharge of the porcelain bushing under the bushing, and the discharge of the outlet device in the raised seat are all typical sources of discharge. ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems existing in the existing design, and to provide an explosion-proof bushing for EHV / UHV gas-insulated transformers with a buffer gas chamber. When the internal discharge of the tube causes damage to the insulating isolation support of the tapered insulator on the bushing side, the insulating isolation support on the transformer side can effectively prevent the transformer oil from flowing into the gas chamber, and at the same time prevent the gas in the bushing from entering the transformer, reducing the risk of the arc igniting the transformer oil. Possibility, reduce the probability of bushing and transformer explosion due to internal discharge of the bushing, thereby improving the safety and reliability of EHV / UHV AC and DC bushings and transformers in operation

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