The automatic circuit breaker is an electrical equipment used for control and protection in the power system. Its main functions are:

①Control function. According to the needs of operation, use circuit breakers to put part of the power equipment and lines into or out of operation

②Protection function. When the power equipment or line fails, the circuit breaker is automatically disconnected through the opening signal sent by the current transformer and the relay protection system, and the faulty part is quickly removed.

Ensure the normal operation of the trouble-free part of the power system.