站用400 V交流系统中性线多点接地影响分析  

Influence analysis of multi point grounding of neutral line in 400 V AC station system

作　　者：吴江雄 徐超 李河 龙登其 吴文健 Wu Jiangxiong;Xu Chao;Li He;Long Dengqi;Wu Wenjian(Guilin Power Supply Bureau of Guangxi Power Grid Co.,Ltd.,Guilin 541000,China;Guangzhou Qianshun Electronic Equipment Co.,Ltd.,Guangzhou 510000,China)

机构地区：[1]广西电网公司桂林供电局,广西桂林541000 [2]广州市仟顺电子设备有限公司,广东广州510000

出　　处：《无线互联科技》2021年第15期15-16,共2页Wireless Internet Technology

摘　　要：低压交流配电系统接地方式有IT,TT,TN 3种方式,其中TN方式分为TN-S,TN-C和TN-C-S 3种方式;不管是哪种方式,其中性线均是要求一点接地。但也因交流配电系统为接地系统,中性线在变压器端接地;若供电网络重复接地,对供电负荷没有明显实际影响,所以人们并不太关注。在引入交流系统绝缘监测后,中性线多点接地会对绝缘监测造成干扰。文章从原理上分析中性线多点接地的影响,提出故障监测方法。Low voltage AC distribution system grounding methods are:it,TT,TN three ways,TN way is divided into TN-S,TN-C and TN-C-S three ways;no matter which way,the ground wire is required to be grounded at one point.But also because the AC distribution system is grounded system,the neutral line is grounded at the transformer end;if the power supply network is repeatedly grounded,there is no obvious practical impact on the power supply load,so people do not pay much attention to it.After the introduction of AC system insulation monitoring,multi-point grounding of neutral line will cause interference to insulation monitoring.This paper analyzes the influence of multi-point grounding of neutral line in principle,and puts forward the fault monitoring method.

关 键 词：中性线多点接 多点接地故障 泄漏电流 

分 类 号：TM862[电气工程—高电压与绝缘技术]