低压断路器几种特殊的短路保护

Several Kinds of Special Short-Circuit Protection for Low-Voltage Circuit Breakers

介绍了级联保护、能量脱扣保护、区域选择性连锁保护以及接通电流脱扣和高设定值瞬时短路(MCR&HSISC)保护的基本原理,给出了级联保护示意图、区域选择性连锁保护逻辑图、MCR&HSISC保护单元功能结构与脱扣原理图。对于级联保护和能量脱扣保护必须以生产厂家提供的配合表或配合原则进行选择,当故障电流超大达到预期短路电流的极限或断路器本身的极限,MCR&HSISC保护采用最快的脱扣方式进行短路分断,而不再考虑保护的选择性,避免配电系统和自身致命的伤害。

Introduction was made to basic principles of cascading protection, energy tripping protection, zone-selective interlocking protection, making current release and high setting instantaneous short circuit （MCR＆HSISC） protection. This paper gave cascading protection schematic diagram, zone selective interlocking protection logic diagram, MCR＆HS1SC protection unit function structure and tripping sche- matic diagram. Cascading protection and energy tripping protection selection must be carried out according to the matching table or matching principle provided by the manufacturer. When the fault current was up to the maximum of predicated short-circuit current or the maximum of the circuit breaker, MCR＆HSISC protection adopted the fastest tripping method to carry out short-circuit breaking-off to avoid harm for distribution system and itself without any consideration for selective protection.