Self-power transmission device of universal circuit breaker

Abstract

A self-power transmission device of a universal circuit breaker of the present invention comprises a first voltage relay, a second voltage relay, an intermediate relay, a closing relay and a time relay, a three-phase sampling power supply at the incoming line side of the circuit breaker separately accesses the coils of the first and second voltage relays, and the normally-open contacts of the first and second voltage relay and the normally-closed contacts of the closing relay and the circuit breaker are connected in series one by one and then access the coil of the time relay. The normally-open contact of the time relay is in series connection with the coil of the intermediate relay, the normally-open contacts of the closing relay and the circuit breaker are connected in parallel and then are in series connection with the coil of the closing relay, and the normally-open contact of the intermediate relay and the normally-closed contact of the closing relay are connected in series and then the two ends of the series connected structure are in parallel connection with a closing button of the circuit breaker. The device is small in size and convenient in wiring, accelerates the power consumption recovery speed after the non-fault power-off, saves the labor force of the power supply workers, and solves the defect that the circuit breaker can not transmit power by itself.

Description

technical field [0001] The invention belongs to the technical field of electrical equipment and electrical engineering, and relates to a self-power transmission device, in particular to a self-power transmission device of a universal circuit breaker. Background technique [0002] At present, in the 0.4KV low-voltage power distribution system, the main circuit breaker, such as the DW15 type, DW17 type and other universal circuit breakers, has the function of voltage loss protection, that is, when the circuit is lower than the rated voltage or the superior power is cut off, the circuit breaker will automatically Trip to avoid safety accidents. [0003] The existing universal circuit breaker has a voltage loss protection function, although it will automatically trip in the event of a fault and loss of voltage, which effectively avoids the occurrence of safety accidents. However, in the case of undervoltage tripping in non-fault power outages, or when the line has returned to n...

AI Technical Summary

Problems solved by technology

For this reason, some users find it troublesome and directly remove the voltage-loss release of the circuit breaker. However, the circuit breaker loses the function of voltage-loss protection, which can easily cause accidents.

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