电气设备外壳带电原因分析及对策

对现行的低压配电系统中的电气设备外壳带电原因进行了分析，认为在不接地的配电网中，没有采取保护接地措施和设备接地电阻过大是设备带电的主要原因；另外，混淆和混用接地和接零、错误的接线、三相负荷不平衡、高次谐波的影响以及零线断线都能导致电气设备外壳带电。根据原因分析，最后给出了相应的对策和措施。

Analysis of Electriferous Effect on the Metallic Shell Surfaces for Electric Equipment

The paper analyzes the current problems of electrification on the metallic shell surfaces of electric equipment in actual Low Voltage Distribution System, and then regards no grounding protection and larger grounding resistance as the main causes for these problems in the earth free main line. Besides, such factors as misuse of grounding protection and returning circuit, false connection, imbalance in three phase load, high order harmonic interference, and breakage of the neutral line and so on are also causes of electrification on the metallic shell surfaces. Based on the above analysis, the paper proposes corresponding measures for solving these problems.