Vacuum isolation arc extinguishing device

Abstract

The invention discloses a vacuum isolation arc extinguishing device. The device comprises a switch base, a moving end insulating sleeve, a static end insulating sleeve, a static contact, a moving contact, a wire incoming terminal, a wire outgoing terminal, a grounding conductor, a corrugated pipe and an operating mechanism, wherein the moving end insulating sleeve, the static end insulating sleeve, the static contact, the moving contact, the wire incoming terminal, the wire outgoing terminal, the grounding conductor, the corrugated pipe and the operating mechanism are arranged on the switch base. According to the vacuum isolation arc extinguishing device of the invention, the static contact and the moving contact are arranged in a vacuum sealing switch tube formed by the static end insulating sleeve, the moving end insulating sleeve and the corrugated pipe, so that opening and closing are realized, and corrosion of the contacts is avoided; furthermore, the static contact and the moving contact are connected with a metal lantern ring arranged in the middle of the vacuum sealing switch tube through the static end insulating sleeve and the moving end insulating sleeve and then are conducted to the ground, so that no through solid insulating material exists in the fracture of the moving contact and the static contact, and leakage current between the fractures is avoided; and finally, one vacuum switch tube is adopted for arc extinguishing and insulation of the switch, so that the reliability requirements of switching on, switching off and safety isolation of a circuit are met, the opening distance of the switch fracture is increased, and the requirements of various types of vacuum switch equipment can be met.

Description

Technical field [0001] The present invention relates to the field of electricity switches, and in particular, to a vacuum isolation arc extinguishing device. Background technique [0002] At present, there is mostly air insulating or SF6 gas insulation. Air insulation performance is general, requiring the fracture of the fracture and the inner insulation distance size, the SF6 gas insulation performance is better but the environment is more serious, and the two types of isolation switch is mostly used by isolation knife or spring ties. Connection and isolation, the sliding friction in the contact surface will cause contact surface wear, affect the conductive contact performance, and the mechanical life is also limited. [0003] Vacuum circuit breakers and load switches use a vacuum arc interruption to perform circuitry and interruption, the arc extinguishing performance is good, but the fracture shortage is small, and the safety distance required for the circuit isolation fractur...

AI Technical Summary

Problems solved by technology

The air insulation performance is average, and the opening distance of the fracture and the insulation distance between the charged body and the ground are required to be relatively large. The SF6 gas insulation performance is relatively good, but it is relatively harmful to the environment. Most of these two types of isolating switches use isolating knives or spring contacts to carry out the circuit. The connection and isolation of the switch, the sliding friction of the contact during the switch operation will cause the contact surface to wear, affect the conductive contact performance, and the mechanical life is also limited

[0003] Vacuum circuit breakers and load switches use a vacuum interrupter to close and break the circuit. The arc extinguishing performance is good, but the opening distance of the fracture is relatively small, which cannot reach the safety distance required for the circuit isolation fracture, and the distance between the fractures after the switch is broken There is a leakage current, so it can only be used as a circuit breaker and load switch, and cannot be used as an isolating switch; due to the relatively small opening distance of the vacuum circuit breaker, it is easy to cause accidents due to re-ignition when switching capacitor banks

[0004] The vacuum switch tube cannot withstand the impact of operation, and it needs to be insulated and poured to make a solid-sealed pole or an additional insulating support. The manufacturing process is relatively cumbersome, and poor interface handling during pouring will cause partial discharge and insulation breakdown.

[0005] Vacuum circuit breakers and load switches must be connected in series with isolating switches to form a multi-fracture combination switch to meet the requirements for circuit on-off and safety isolation; outdoor vacuum circuit breakers on poles cannot have built-in isolating switches, and the isolating switches are exposed to the air and are affected by the environment. Relatively large, the switch contacts are easy to corrode, resulting in poor contact of the contacts and stagnation of the opening and closing operation. Poor contact of the contacts will cause the switch to burn out, and the stagnation of the contacts will cause the operation to refuse to move and the electric operation cannot be performed; The size of the combination switch is relatively large, and two operating mechanisms are required to operate separately. The operation is cumbersome, and an interlock device is required to prevent misoperation. Conducive to the intelligentization of power switchgear and the development of power Internet of Things

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