小电阻接地系统的方案设计及应用.pdf

第27卷第2期
电力科学与技术学报
2012年6月
JOURNAL OF EIECTRIC POWER SCIENCE AND TECHNOLOGY
Jun,2012
小电阻接地系统的方案设计及应用
杨俊,许加柱2,车红卫1,罗隆福2,张志文2
1.湖南省电力公司长沙电业局,湖南长沙410015;2.湖南大学电气与信息工程学院,溯南长沙410082)
摘要:随着电力电缆在城市配电网中的广泛采用,中性点经消弧线圈接地系统已暴露出其存在的不足,针对目
前长沙市配电网的运行状况,对比小电阻接地系统和消弧线接地系统各自的优缺点,以罗家嘴变电站10kV系
统为对象,研究10kV配电网采用中性点经小电阻接地系统的总体方案,主要分析小电阻阻值的选取、接地变压器
容量的确定;重点实测和计算分析小电阻接地系统单相接地故障情况下故障点的跨步电压.目前该接地系统运行
状况良好,为小电阻接地系统在长沙市配电网中的推广应用起到了重要的理论和工程实践指导作用
关键词;小电阻接地系统;消弧线圈;接地变压器;电力电缆;跨步电压;弧光过电压
中图分类号:TM83
文獻标识码:A
文章编号:1673-9140(2012)02-0081-05
Schematic design and application study on
low resistance grounding system
YANG Jun, XU Jia-zhu', CHE Hong-we, LUO Long-fu', ZHANG Zhi-wen?
(. Changsha Electric Power Bureau of Hunan Electrical Company, Changsha 410015, China
2. College of Electrical and Information Engineering, Hunan University, Changsha 410082, China)
Abstract: With the widely use of power cable in distribution networks, the grounding system via
arc suppression coil has exposed some limitation. According to the current operation state of
Changsha distribution network, the advantages and disadvantages of the low resistance grounding
system and arc suppression coil grounding system were analyzed in the paper. The novel sche-
matic design was researched by using 10 kv Luojiazui power station model, which was adopted
the low resistance grounding system to substitute the arc suppression coil grounding system. The
selection of low resistance quantity and the earthing transformers capacity was presented. The
fault point step voltage on the condition of single phase fault was also calculated and analyzed
The new grounding system was realized and normal operation. Therefore, the research has im-
portant theoretical and project practical values to the low resistance grounding system populariza-
tion application in the Changsha city distribution power networks
收稿日期:2012-01-09
基金项目:湖南省电力公司科技项目(2009)
通讯作者:杨俊(1977-),女,工程师,主要从事电网生产技术、高压电气设备和继电保护运行检修以及智能变电站技术的管理研究
E-mailsshanshuitai@sohu.com