Circuit breaker switching-on/off control loop broken line monitoring warning circuit

Abstract

The application discloses a circuit breaker switching-on / off control loop broken line monitoring warning circuit. The circuit comprises a DC power supply, a microcomputer protection measurement and control device, a circuit breaker auxiliary normal-close contact, a circuit breaker auxiliary normal-open contact, a switching-off coil, a switching-on coil, a switching off monitoring red light and a tripping monitoring green light; the microcomputer protection measurement and control device comprises a switching off location relay coil, a tripping location relay coil, a switching off location relay auxiliary normal-open contact, a switching off location relay auxiliary normal-close contact, a tripping location relay auxiliary normal-open contact and a tripping location relay auxiliary normal-close contact; a duty officer can judge whether the switching-on / off loop of the circuit breaker is complete and reliable by checking the switching off monitoring red light, the tripping monitoring green light and the warning information displayed on a liquid crystal panel of the microcomputer protection measurement and control device at field, and timely adopts an effective measure, thereby improving the switching-off efficiency of the circuit breaker, quickly eliminating the switching-off loop fault of the circuit breaker and ensuring the safe and reliable running of the circuit breaker.

Description

technical field [0001] The application relates to the technical field of circuit breaker opening and closing circuit fault monitoring, in particular to a circuit breaker opening and closing control circuit disconnection monitoring and alarm circuit. Background technique [0002] The circuit breaker is a very important power supply equipment in the power system. After the maintenance of the circuit breaker and other high-voltage equipment is completed, the closing electrical control circuit of the circuit breaker should be complete before the circuit breaker is powered on. Electricity drives the closing operating mechanism to complete the closing of the circuit breaker; similarly, in the normal operation of the circuit breaker, the electrical control circuit of the opening of the circuit breaker should be complete and can be opened normally. , The circuit breaker protection trip outlet relay acts, its contacts are closed, the circuit breaker opening coil is energized, and the...

AI Technical Summary

Problems solved by technology

[0003] If the external conditions for closing the circuit breaker before power transmission are not met, the effective alarm and monitoring in advance will not be effective, which will reduce the efficiency of the closing operation and affect the user's power transmission on time, or if the circuit breaker's opening circuit is incomplete during operation, in case of When the line is short-circuited, the circuit breaker protection will refuse to operate, and the fault point can only be disconnected by leapfrog tripping, which will cause a large-area power loss accident on the busbar

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