低压配电单相接地故障保护的设计与应用

Design and Application of Single Line-to-ground Fault Protection in Low-voltage Power Distribution

在低压配电系统中,单相接地故障是一种因电气绝缘失效引起的临时性故障,必须及时排除,否则将产生严重后果,而设置单相接地故障保护是常用方法。结合工程实际,分析了需要设置单相接地故障保护的几种应用情况,列出了低压配电设计中几种不同的配电形式,提出了根据不同形式设置单相接地故障保护的办法,总结出实际应用中的几种可行办法,用户可根据需求选择最优设计方案。

In low-voltage distribution system, single-phase ground fault is a kind of temporary fault caused by electrical insulation failure, which must be eliminated in time, otherwise it will have serious consequences, and setting up single-phase ground fault protection is a common method. Combined with engineering practice, several application situations of single-phase ground fault protection were analyzed, several different distribution forms in low-voltage distribution design were listed, the methods of setting single-phase ground fault protection according to different forms was put forward, and several feasible methods in practical application was summarized, users could choose the optimal design scheme according to their needs.