Protection circuit of high voltage circuit breaker energy storage drive motor

Abstract

The invention provides a protective circuit for an energy storage driving motor of a high-voltage circuit-breaker. The protective circuit comprises an air switch KK, an energy storage limiting normally-closed contact C, an energy storage driving motor M, a background monitoring system and a time relay SJ1, wherein the time relay SJ1 is provided with a time-delayed disconnected normally-closed contact SJ1-1 and a normally-opened contact SJ1-2; one end of the air switch KK is electrically connected with one end of the energy storage limiting normally-closed contact C; the other end of the energy storage limiting normally-closed contact C is collinear with the line terminal of the coil of the time relay SJ1 and one end of the time-delayed disconnected normally-closed contact SJ1-1 of the time relay SJ1; the other end of the time-delayed disconnected normally-closed contact SJ1-1 is electrically connected with one end of the coil of the energy storage driving motor M; the normally-opened contact SJ1-2 of the time relay SJ1 is in signal electric connection with the background monitoring system. According to the invention, the protective circuit can prevent the energy storage driving motor from being burned out, and is simple in structure, easy to carry out, and low in cost.

Description

Technical field [0001] The invention relates to a protection device for a high-voltage circuit breaker in an electric power system, in particular to a protection circuit for a high-voltage circuit breaker energy storage drive motor. Background technique [0002] At present, the operating mechanism of high-voltage circuit breakers in the power system generally adopts the operating mechanism of closing and storing energy. The stored energy spring automatically releases energy when the circuit breaker is closed successfully, and the stored energy spring that has lost the stored energy needs to be recharged for next use. The energy storage spring is generally used to recharge the energy storage drive motor. In the normal energy storage process of the existing energy storage spring of the high-voltage circuit breaker, when the energy of the energy storage spring is released, a limit contact of the high-voltage circuit breaker spring energy storage arm contact is turned on, and the li...

AI Technical Summary

Problems solved by technology

[0003] At present, the energy storage mechanism of high-voltage circuit breakers, especially capacitor interval circuit breakers with capacitor combinations that are automatically switched according to reactive power optimization, will cause frequent temporary faults on the line due to lightning and other reasons. At this time, relay protection and automatic devices Frequent opening and closing operations of the circuit breaker will cause failure or abnormality of the energy storage mechanism of the circuit breaker, especially the failure of the energy storage mechanism and its limit contacts, which will cause energy storage After the energy storage of the spring is completed, the limit contact cannot be disconnected. If the limit contact cannot be disconnected, the energy storage drive motor will keep idling

The energy storage drive motor will burn out if it idles for a long time

However, after the energy storage drive motor burns out, the circuit breaker will not be able to store energy for the energy storage spring after the next closing, which will affect the normal operation of the circuit breaker and cause equipment power outages.

Since the energy storage drive motor is usually installed inside the circuit breaker, it is difficult and cumbersome to replace

Moreover, the replacement of the energy storage drive motor requires the disassembly and assembly of the switch mechanism of the circuit breaker, which is likely to cause new faults to the circuit breaker due to misoperation.

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