High-pressure large-current dry compressed air insulated metal closed switch equipment

Abstract

The invention relates to high-pressure large-current dry compressed air insulated metal closed switch equipment, solving the problems of environment pollution and poor heat dissipation property when SF6 gas is used as an insulation medium. The switch equipment is characterized in that an upper seal plate, a left seal plate, a right seal plate and a back seal plate of a gas tank are provided with radiating fins; a three-station switch is connected with a solid sealed pole post through a copper connecting piece; a copper connecting radiating fin is installed outside the copper connecting piece; a radiating through hole is processed on the outlet end of the moving contact of the solid sealed pole post; the front part of the epoxy resin insulation shell of the solid sealed pole post is provided with a convection notch; an anti-cracking gap is reserved between the epoxy resin shell and the static contact end outlet seat of the solid sealed pole post; and a U-shaped radiating bus is mounted at the tail end of the solid sealed pole post. The equipment disclosed by the invention has the beneficial effects of improving the distribution of electric fields while realizing radiation, meeting the requirement of dry compressed air insulated metal closed equipment which takes clean and dry compressed air as an insulation medium and has the voltage of 40.5kV and current of more than 2000A and realizing energy conservation and environment protection.

Description

technical field [0001] The invention belongs to the technical field of high-voltage electrical appliances, and in particular relates to a high-voltage and high-current dry compressed air insulated metal-enclosed switchgear with a voltage of 40.5kV and a current of more than 2000A using clean and dry compressed air as an insulating medium. Background technique [0002] In the prior art, high-voltage and high-current gas-insulated metal-enclosed switchgear with a voltage of 40.5kV and a current of more than 2000A generally adopts SF 6 (sulfur hexafluoride) gas as an insulating medium, while SF 6 The gas is one of the greenhouse effect gases restricted by the "Kyoto Protocol" and its greenhouse effect is 29,000 times that of carbon dioxide. At the same time, SF 6 Under the action of the arc, the gas will produce toxic and harmful gas, which is seriously harmful to metals and people. Therefore, clean and dry compressed air is used as the insulating medium to replace SF 6 Gas i...

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Problems solved by technology

[0002] In the prior art, high-voltage and high-current gas-insulated metal-enclosed switchgear with a voltage of 40.5kV and a current of more than 2000A generally adopts SF 6 (sulfur hexafluoride) gas as an insulating medium, while SF 6 The gas is one of the greenhouse effect gases restricted by the "Kyoto Protocol" and its greenhouse effect is 29,000 times that of carbon dioxide. At the same time, SF 6 Under the action of the arc, the gas will produce toxic and harmful gas, which is seriously harmful to metals and people. Therefore, clean and dry compressed air is used as the insulating medium to replace SF 6 Gas is an important measure to achieve energy saving, emission reduction and environmental protection. However, the insulation performance of clean and dry compressed air is far worse than that of SF 6 Gas, the structure of the existing gas-insulated metal-enclosed switchgear has poor heat dissipation performance. If clean and dry compressed air is used as the insulating medium in the structure of the existing gas-insulated metal-enclosed switchgear with poor heat dissipation performance, it will Some phase-to-phase and phase-to-ground discharges and breakdowns occur, and the problem of temperature rise is also a gap that is difficult to bridge. Therefore, the existing structure cannot be applied to high voltages with a voltage of 40.5kV and a current of more than 2000A using clean and dry compressed air as the insulating medium. High-current gas-insulated metal-enclosed switchgear

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