小电流接地系统单相接地故障选线方法的分析 

何绍洋，叶楠 
河源供电局，广东 河源 517000 
 

摘 要：介绍了单相接地时电流及电压的变化及目前站内接地装置的选线方式，分析了单相故障接地选线方法的原理并对选线方法进行改进，即将原有的补偿方式改为采用并联中电阻进行选线。经现场试验验证，采用并联中电阻的选线方式不仅可准确选线，且减少接地点残流，限制弧光接地过电压，合理补偿电容电流，提高了供电可靠性。
关键词：小电流接地方式；消弧线圈；单相接地故障；中电阻
中图分类号：TM711 文献标识码：A 文章编号：1007-3175(2015)04-0038-04

Analysis of Fault Line Selection Method for Single Phase in Small Current Earthing System 

HE Shao-yang, YE Nan 
Heyuan Power Supply Bureau, Heyuan 517000, China 
 

Abstract: Introduction was made to the change of current and voltage at single phase earthing condition, and the line selection mode of the earthing device in substation. Analysis was made to the principle of line selection mode during single phase fault earthing and the line selection method was improved. In this way, the former compensation method should be altered and parallel resistor line selection mode was adopted. Through on-site test verification, the adopted parallel resistor line selection mode would not only contribute to the accurate line selection but also decrease the residual current of earthing point, so as to limit the over-voltage of arc grounding and to compensate the capacitive current reasonably, which improve the reliability of power supply.
Key words: small current earthing mode; arc suppression coil; single phase earthing fault; medium resistance

参考文献
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