基于相间电流突变特征的可调消弧线圈接地系统选线方法  

A faulty feeder selection method for adjustable arc-suppression coil system based on phase-to-phase current mutation feature

作　　者：陈桥山 王媛媛[1] 方涛 韦根 黄跃 CHEN Qiaoshan;WANG Yuanyuan;FANG Tao;WEI Gen;HUANG Yue(Hunan Provincial Engineering Research Center of Electric Transportation and Smart Distributed Network, Changsha University of Science & Technology, Changsha 410114, China;Jiangmen Power Supply Bureau, Guangdong Power Grid Co.,Ltd., Jiangmen 529200, China;Nanning Power Supply Bureau, Guangxi Power Grid Co.,Ltd., Nanning 530029, China;Changsha Power Supply Bureau,State Grid Hunan Electric Power Co.,Ltd., Changsha 410015, China)

机构地区：[1]长沙理工大学湖南省电动交通与智能配网工程技术研究中心,湖南长沙410114 [2]广东电网有限责任公司江门供电分公司,广东江门529000 [3]广西电网有限责任公司南宁供电分公司,广西南宁530000 [4]国网湖南省电力有限公司长沙供电分公司,湖南长沙410015

出　　处：《电力科学与技术学报》2022年第2期47-53,共7页Journal of Electric Power Science And Technology

基　　金：国家自然科学基金(51777014);湖南省重点研发项目(2018GK2057);湖南省教育厅重点项目(18A124);长沙市科技计划项目(kq1901104)。

摘　　要：为提高中性点经消弧线圈接地系统故障选线的准确性,详细分析单相接地故障时故障线路与非故障线路相间电流分布特征。发现过渡电阻不大时故障线路相间电流在故障前、后变化量与非故障线路相间电流变化量差别较大,但在高阻接地故障时差别不明显;故障后主动调整消弧线圈补偿度,发现高阻接地故障时故障线路相间暂态电流突变量等于零序电感电流变化量,特征表现明显。为此,提出综合利用故障发生与补偿度调整后的相间电流突变特征的无整定故障选线方法,并借助欧式距离定义各线路故障特征距离,故障线路表征出最大值。大量仿真结果表明,所提新判据具有免整定、耐高过渡电阻和小故障角故障等优点。In order to improve the accuracy of faulty feeder selection when the single-phase-grounding fault occurs in a resonant earthed system,the distribution features of phase-to-phase current in both faulty lines and non-faulty lines are analyzed in detail.It is found that in a small fault resistance rather than a high fault resistance,there is a significant difference between the variation of phase-to-phase current in faulty feeder and non-faulty feeder.If the compensation degree of arc-suppression coil is adjusted after the occurrence of the fault,the mutation of phase-to-phase transient current would be equal to the change of zero-sequence inductor current,which is more overt in the case of high impedance grounding faults.Therefore,a non-setting faulty line selection method is proposed,which integrates the mutation features of phase-to-phase current mutation in each line with compensation adjustment after the fault.The fault feature distance can also be defined by Euclidean distance so that the line with maximum value can be distinguished as the faulty line.Simulation results show that the proposed criteria requires no setting,and can fit in the scenarios with high transition resistance orsmall inception angle fault.

关 键 词：故障选线 谐振接地系统 单相接地故障 相间电流变化量 

分 类 号：TM862[电气工程—高电压与绝缘技术]