Vacuum arc-extinguishing chamber with built-in isolation and vacuum circuit breaker

Abstract

A vacuum arc-extinguishing chamber with built-in isolation comprises a vacuum arc-extinguishing chamber and is characterized by further comprising an isolation component, a conjunction component and apull rod component. The vacuum arc-extinguishing chamber and the isolation component are connected in series. The pull rod component is connected to an operating mechanism. The pull rod component operates and drives the isolation component and the isolation component to operate by the conjunction assembly. During switching off, the vacuum arc-extinguishing chamber first performs a switching-off operation and then the isolation component performs a switching-off operation. During switching on, the isolation component first performs a switching-on operation, and the vacuum arc-extinguishing chamber performs a switching-on operation. The vacuum arc-extinguishing chamber includes an arc-extinguishing chamber static contact and an arc-extinguishing chamber movable contact. The isolation component comprises an isolating blade and an isolating static contact. The conjunction component comprises a bracket, a crank arm, an arc extinguishing chamber driving plate, an isolating driving plate, afirst driving pin and a second driving pin. The vacuum arc-extinguishing chamber with built-in isolation has the advantages of compact structure, convenient operation, and good safety and reliability.

Description

technical field [0001] The invention relates to the technical field of power transmission and distribution, in particular to a pole-mounted vacuum circuit breaker. Background technique [0002] In order to improve the reliability of distribution network power supply and strengthen the safety management of distribution network, the State Grid Corporation of China began to vigorously promote the primary and secondary integration projects of power distribution equipment in 2016. Among them, the vacuum circuit breaker on the column is the main equipment in the primary circuit. However, since the breaking distance of the vacuum interrupter is generally only 8 to 10 mm, the distance between the breaking points is relatively small. In the opening state, when a high overvoltage or lightning impact occurs on the power supply line, the vacuum breaking point is likely to be hit. Wear, so that the other side of the switch is charged again, causing an accident. On trunk lines, this unr...

AI Technical Summary

Problems solved by technology

However, most of the mainstream pole-mounted vacuum circuit breakers currently on the market are external isolation blades.

This kind of external isolating knife needs to be operated separately, and an interlocking device with the circuit breaker needs to be added. At the same time, the external isolating knife is greatly affected by the external environment, and its contact knife is easily oxidized, resulting in hidden dangers such as increased contact resistance and heat generation.

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