Multi-stroke realizing circuit and multi-stroke control method for circuit breakers

Abstract

The invention discloses a multi-stroke realizing circuit and a multi-stroke control method for circuit breakers. The multi-stroke realizing circuit comprises a microprocessor, a positive control bus +KM, a negative control bus -KM, a current relay HBJ, a circuit breaker auxiliary normally closed contact DL, a closing coil HQ and a manual closing operation switch KK, and further comprises a switching device HZ. First, the microprocessor controls the switching device and further controls on-off of the closing coil so as to make the circuit breaker auxiliary normally closed contact do stroke movement repeatedly when the circuit breaker auxiliary normally closed contact fails to be closed in the first stroke of the closing coil, thus avoiding the situation in which a circuit breaker is burned out when the circuit breaker receives a closing instruction but fails to be closed; and then, the microprocessor makes the closing coil of the circuit breaker do stroke movement repeatedly, which can improve the success rate of circuit breaker closing under emergency conditions and guarantee the electric safety of production and life to a greater extent.

Description

technical field [0001] The invention relates to the protection field of distribution substation devices, in particular to a circuit breaker multi-stroke realization circuit and a control method. Background technique [0002] In order to prevent damage to the contacts of the opening and closing relays during the process of disconnecting the operating current, the traditional opening and closing control circuits are equipped with current self-holding coils. Since the principles of the opening and closing control circuits are the same, we use the closing circuit As an example to explain the principle; figure 1 The closing circuit shown includes microprocessor, positive control bus +KM, negative control bus -KM, current self-holding coil HBJ, circuit breaker auxiliary normally closed contact DL, closing relay HJ, manual closing operation switch KK and closing Brake coil HQ, the output terminal of the microprocessor is connected with the closing relay HJ, which is used to contro...

AI Technical Summary

Problems solved by technology

[0004] The invention discloses a circuit breaker multi-stroke realization circuit and a control method, which solves the problem that the closing / opening coil of the circuit breaker is easily burned due to the failure of a single action of the traditional circuit breaker control circuit

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