Electrical interlocking circuit for high-voltage switchgear

Abstract

The invention discloses an electrical interlocking circuit of a high-voltage switchgear, comprising an electrical interlocking circuit of an incoming circuit breaker cabinet, an electrical interlocking circuit of a feeder circuit breaker cabinet, an electrical interlocking circuit of a bus tie circuit breaker cabinet, and an electrical interlocking circuit of a bus tie isolation cabinet. Interlock circuit and voltage transformer cabinet electrical interlock circuit. The invention is reasonable in design, simple in structure, safe and reliable, perfects the electric interlocking circuit of the switchgear, can realize the requirement of "five defenses", and guarantees personal safety.

Description

technical field [0001] The invention relates to the technical field of high-voltage switchgear, in particular to an electrical interlock circuit of high-voltage switchgear. Background technique [0002] The interlocking of high-voltage switchgear is an important measure to ensure the safe operation of the power grid, ensure equipment and personal safety, and prevent misoperation. GB3906 "3-35kV AC metal-enclosed switchgear" has also made clear regulations on this. Interlocking is generally described as: preventing mis-opening and closing of circuit breakers; preventing load opening and closing of isolating switches; preventing charged from hanging (closing) grounding wires (grounding switches); : To prevent accidental entry into the electrified interval, the above five items to prevent electrical misoperation are referred to as "five preventions". The "five defenses" devices can generally be divided into three categories: mechanical, electrical and comprehensive. [0003]...

AI Technical Summary

Problems solved by technology

[0003] At present, the 10kV complete switchgear is widely used in the power system. Although the complete switchgear itself has a certain mechanical error prevention function, in terms of its function, it cannot fully realize the five-proof function. There are still many high-voltage switchgear interlocks. In particular, the electrical interlock is still not perfect, and it cannot fully meet the requirements of "five preventions", which brings safety hazards to operators. In the secondary circuit, the anti-jump circuit of the circuit breaker mainly uses the circuit breaker mechanism to prevent jump

However, there are certain design flaws in the anti-jump circuit used for high-voltage circuit breakers in the prior art, especially in cooperation with the microcomputer relay protection device, the anti-jump circuit is prone to parasitic circuit problems, and even after the fault is eliminated, the anti-jump relay contacts still remain. It cannot be reset, causing the circuit breaker to fail to close again after tripping, which brings great inconvenience to users

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