中性点经消弧线圈接地系统单相接地故障数据分析  

Statistics of single-phase grounding faults with arc suppression coil grounding systems

作　　者：刘健 王毅钊 张小庆 李石 张志华 陈洁羽 LIU Jian;WANG Yizhao;ZHANG Xiaoqing;LI Shi;ZHANG Zhihua;CHEN Jieyu(State Grid Shaanxi Electric Power Research Institute,Xi'an 710100,China;State Grid Shaanxi Electric Power Company,Xi'an 710032,China)

机构地区：[1]国网陕西省电力公司电力科学研究院,陕西西安710100 [2]国网陕西省电力有限公司,陕西西安710032

出　　处：《供用电》2022年第4期40-44,共5页Distribution & Utilization

基　　金：国家自然科学基金重点支持项目“城市智能配电网保护与自愈控制关键技术”(U1766208)。

摘　　要：单相接地故障是配电网中最为常见的故障,为了掌握中性点经消弧线圈接地系统单相接地故障的特性,对已经完成了单相接地保护改造的西安供电公司市区18座110 kV变电站的单相接地故障处理记录进行了统计分析。分析结果表明:补偿良好的消弧线圈具有很强的熄弧能力,自熄弧故障的比率在80%左右;单相接地故障中单次持续接地占比约90%,多次间歇性接地占比约10%;80.92%的自熄弧故障的熄弧时间在1 s内。上述统计分析结果对于科学选择中性点接地方式和设置单相接地保护参数具有参考价值。Single-phase grounding faults are the most common faults in distribution networks.In order to make clear the behavior of single-phase grounding faults with arc suppression coil grounding systems,the single-phase grounding fault records of eighteen substations in Xi'an city that have completed single-phase grounding protection transformation are statistically analyzed.According to the results,a well compensated arc extinguishing coil has strong arc extinguishing ability.Over eighty percent arcs were extinguished by the arc suppression coils.About ninety percent of arc extinguished faults are with continuous grounding,while nearly ten percent of arc extinguished faults are intermittent.More than eighty percent of arcs of temporary faults may be extinguished within one second.Above information may have reference value for scientific selection of neutral grounding modes and setting for single-phase grounding fault protection parameters.

关 键 词：中性点经消弧线圈接地系统 变电站 配电网 单相接地故障 消弧线圈 统计分析 

分 类 号：TM72[电气工程—电力系统及自动化]