浅谈电气隔离和四极开关的应用

Brief discussion on the application of electrical isolation and four-pole switch

简要介绍了电气隔离和四极开关的用途和功能,分析了三相断电后中性线带危险电压的原因,阐述了单电源不同类型接地系统对开关极数的不同要求和滥用四极开关的后果等内容,以期指导电气维修和安装时正确选用四极开关。

It briefly introduces the uses and functions of the electrical isolation and four-pole switch, analyzes the reason why neutral wire car- ries dangerous voltage after the three-phase current is cut off, illustrates the single power with different types of grounded systems have differ- ent requirement for the pole number of the switch, and illuminate the effect of the abu~ of four-pole switch and other related contents, so as to direct people to choose the four-pole switch correctly during the maintenance and installation of electrical equipments.