智能型塑壳断路器中接地故障保护功能设计

Functional Design of Earth-Fault Protection in Intelligent Moulded Case Circuit Breaker

接地故障保护作为低压配电线路中一项重要保护要求,在万能式断路器中已经得到广泛的应用,而对于塑壳断路器中接地故障保护功能的设计,我国仍处于起步阶段。针对接地故障特点,介绍了实现塑壳断路器接地故障保护功能的三相电流相量和的设计方法,实现了接地故障的有效保护,为低压电网的可靠运行提供了保障。

The earth-fault protection as one of the most important protection requirements in the low voltage distribution lines has been widely used in the air circuit breaker.The design of earth-fault protection function in moulded case circuit breaker（MCCB） was lacked in China.According to the characteristics of the earth-fault protection,a design method was described that how to realize the earth-fault protection function in the intelligent MCCB through the three-phase current vector sum,the method achieved effective protection of earth-fault,a guarantee reliable operation for low voltage power grid was provided.