Circuit breaker operation loop

Abstract

The invention discloses a circuit breaker operation loop, for tripping switching-off and switching-on control and loop monitoring. An operation power source controlling a circuit breaker is generally applied to alternating currents or direct currents; the circuit breaker operation loop comprises multiple parallel-connected branches; at least one of the branches is provided with a direct current relay and a rectifier bridge connected in series with the loop of the direct current relay; and the circuit breaker operation loop further comprises a self-adaptive loop. By using the circuit breaker operation loop, switching-off and switching-on current self-adaptive and voltage type relays can be converted to current relays, and the problem of difficulty in selecting the model of switching-off and switching-on loop current relays is solved. According to the circuit breaker operation loop, through reasonable structural design of a circuit, the circuit breaker operation loop can be generally applied to both an alternating current power source and a direct current power source, and self-adaptation of switching-off and switching-on currents is realized.

Description

technical field [0001] The invention relates to the technical field of circuit components, in particular to a circuit breaker operating circuit. Background technique [0002] The circuit breaker is an important component of the power system. It is mainly used to switch on and off the load current of the high-voltage circuit and cut off the fault current. The operation circuit is a secondary device to realize the circuit breaker tripping control and status monitoring. The circuit breaker operating circuit is mainly used in power plants, substations and other power supply and consumption systems to realize circuit breaker tripping control and status monitoring. [0003] In the prior art, the circuit breaker generally adopts a DC operating power supply, and common operating circuits are designed according to the DC power supply. In order to save investment, some power supply systems are not equipped with a DC system. The circuit breaker needs to use an AC operating power suppl...

AI Technical Summary

Problems solved by technology

Because the welding quality is difficult to control, the reliability of the operating circuit is reduced

[0006] Ordinary operating circuits often encounter the problem of circuit breaker jumping. When the external closing contact is connected to close the circuit breaker to the faulty high-voltage equipment, the relay protection device of the high-voltage equipment will operate to trip the circuit breaker. If the external The closing contact has not been disconnected, the circuit breaker will close again, and the relay protection device will trip again, and so on, causing the problem of circuit breaker jumping

When the circuit breaker jumps, it is easy to damage the operating mechanism, and the circuit breaker will explode due to repeated opening and closing of the fault current.

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