金属外壳结构的电气设备地线过流分析和对策

The Metal Structure of Ground Flow Analysis and Countermeasures of Electric Equipment

本文分析了国内城镇低压电网接地系统类型、地线带电的主要原因和特征,再通过建立电路模拟图形分析地线带电导致金属外壳电器设备地线过流的根本原因和危害。最后提出预防地线带电导致地线过流引起火灾的对策。

This paper analyzes the type of grounding system of low-voltage power network in domestic cities and towns,the main reasons and characteristics of ground wire electrification,and then through the establishment of circuit simulation graphics analysis of ground wire electrification leads to metal enclosure electrical equipment ground wire overcurrent root cause and harm.At last,the countermeasures to prevent fire caused by ground wire overcurrent caused by ground wire electrification are put forward.