Disconnecting switch and vacuum circuit breaker composite system

Abstract

The invention discloses a disconnecting switch and vacuum circuit breaker composite system. A disconnecting switch and a vacuum circuit breaker are connected in series to constitute a composite switch system in which a disconnecting break is associated with a vacuum interrupter break, wherein the disconnecting beak is a spacing zone between a disconnecting link of the disconnecting switch and the tail end of a moving contact of the vacuum circuit breaker, and the vacuum interrupter break is the other break between the moving contact and a static contact of the vacuum circuit breaker. The disconnecting break provides a visible electric spacing section for the vacuum interrupter break. By implementation of the composite system scheme disclosed by the invention, the disconnecting switch and the vacuum circuit breaker are associated mutually so that the composite system is free from electric-mechanical interlocking and is compact in volume, simple and reliable in structure and increased in safety; and particularly, a vacuum interrupter of the vacuum circuit breaker only needs to bear lower power frequency recovery voltage and transient recovery voltage, so that the insulation requirement for the vacuum interrupter is reduced and the cost is reduced.

Description

technical field [0001] The invention relates to a high-voltage air circuit breaker system, in particular to a composite switch system with the functions of isolation and arc extinguishing. Background technique [0002] Isolation switch: It is a control electrical appliance without an arc extinguishing device. Its main function is to isolate the power supply to ensure the safe maintenance of other electrical equipment, so it is not allowed to operate with load. But under certain conditions, small power circuits are allowed to be switched on or off. The isolation fracture provided by the isolating switch must ensure that the fracture will not be broken down in the air and cause discharge. [0003] Vacuum circuit breaker: It can switch on and off the circuit under load through the vacuum interrupter, and can quickly cut off the short-circuit current when the system has a short-circuit fault. It can also automatically cut off the short-circuit fault under the action of the pro...

AI Technical Summary

Problems solved by technology

[0005] It can be seen that the traditional technology has two deficiencies: one isolating switch and the circuit breaker are independent of each other, the isolating switch provides a visible isolation fracture, and the circuit breaker provides the fracture of the dynamic and static contacts of the vacuum interrupter. , resulting in bulky switchgear and high cost; the disconnector and the circuit breaker need to be electrically and mechanically interlocked to ensure that the disconnector cannot operate when the circuit breaker is closed

And increasing the interlock will increase the cost accordingly, and when the interlock fails, there is still a risk of misoperation in theory, and the reliability is poor

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