Five-proof interlocking device for bypass center cabinet

Abstract

The invention discloses a five-prevention interlocking device in a bypass centrally-arranged cabinet. The five-prevention interlocking device has a mechanical interlocking function and an electrical auxiliary interlocking function. When an outgoing cabinet circuit breaker needs maintenance or fails and requires bypass power supplying, at first charging test is performed on a bypass bus; a bypass cabinet circuit breaker is disconnected; when a bypass circuit breaker is switched off, and a requirement for the electrification of an electromagnetic lock of a bypass isolation switch when an earthing switch is in a separation position is satisfied, the electromagnetic lock is switched on, and the switch-on operation is performed on the bypass isolation switch; and after the switch-on operation of the bypass isolation switch is finished, switch-on operation is performed on the bypass switch cabinet circuit breaker; an outgoing cabinet and a bypass cabinet simultaneously supply power for an outgoing load loop; and finally, switch-off operation is performed on the outgoing cabinet circuit breaker, and the outgoing cabinet circuit breaker is pulled to a test position, and the bypass cabinet and a bypass isolation switch loop can continuously supply power for an outgoing load. With the five-prevention interlocking device in the bypass centrally-arranged cabinet of the invention adopted, uninterrupted power supplying can be realized; the isolation switch, the circuit breakers, the earthing switch can be in interactive interlocking with each other, which enables safety and stable operation; no sequence errors occur in an operation process; and a requirement for five-prevention can be realized.

Description

technical field [0001] The invention relates to the field of complete sets of electrical switchgear technical equipment, in particular to a five-proof interlocking device with a bypass central cabinet in a high-voltage switchgear anti-misoperation operating system. Background technique [0002] In high-voltage complete sets of electrical equipment, in order to ensure the reliable operation of metal-enclosed switchgear and the personal safety of operators, the central cabinet with bypass in the high-voltage cabinet is mainly composed of vacuum circuit breakers, disconnectors, grounding switches and other operating elements, as well as mutual inductance. Devices and other measuring and protection components form a power supply circuit. In order to avoid short circuit, electric shock, and equipment damage caused by misoperation, the "five prevention" interlock requirements must be met in accordance with national regulations, that is, the bypass central cabinet should have perfe...

AI Technical Summary

Problems solved by technology

[0003] In the traditional high-voltage switchgear, the anti-misoperation of the isolating switch and the conjoined vacuum circuit breaker generally adopts a movable program lock. The selective insertion and cooperation of multiple holes and pins is also easy to get stuck and unreliable; also because the movable parts sometimes shift, causing it to get stuck, etc., which makes it inconvenient to use

The existing bypass high-voltage cabinet circuit breaker is fixed and difficult to replace, and the busbar is not closed and easy to touch the live parts, etc., which have obvious structural defects. In order to improve the reliability and continuity of power supply, in order to improve the unfavorable factors such as the fixed installation of the circuit breaker of the original bypass high-voltage cabinet, which is not easy to replace, and the busbar is not closed and easy to touch the live parts, etc., in recent years, the high-voltage switch cabinet with bypass central cabinet has an anti-malfunction operation system. In order to meet the market demand, its "five-proof" interlocking mechanism has been continuously improved. Although it overcomes some disadvantages of the original high-voltage cabinet, the five-proof interlocking mechanism in the more scientific and reasonable high-voltage switchgear anti-malfunction operating system Institutions still need to improve the design

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