含同母线环路的配电网单相接地故障特征及选线
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摘要
现有小电流接地故障选线方法均以辐射状线路为基础,特定情况时将出现同母线环路供电情况,接地故障特征将发生变化,已有选线方法需要重新审视。文中建立了含环路配电网单相接地故障复合网络,推导了环路两端出口稳态与暂态零序电流的分布特征,分析了已有选线方法的适应性。结果表明,环路接地时,随线路参数和故障位置不同,环路两端出口电气量并非始终表现为故障线路特征,已有稳态量和暂态量选线方法将可能出现误选与漏选。可通过增加备选线路条数并利用环路中一条出口线路切除前后其余各线路零序导纳的变化辨识故障线路或将环路两端出口零序电流之和参与选线比较的方法解决该问题。仿真与现场数据验证了故障特征的正确性及所提选线措施的有效性。
The existing line selection technologies of small current grounding fault are all based on radiating lines.However,the case of bus line loop will appear under certain circumstances,and then the characteristics of the grounding fault will change,which means the existing line selection methods need to be updated.In this paper,a compound network of single-phase grounding fault in distribution network with loop is established.After then,the distribution characteristics of the steady and transient zero-sequence currents at the end of the loop are derived,and the adaptability of the existing line selection methods is analyzed.The results show that,in the case of loop grounding,with the difference of the line parameters and the location of the fault,the electrical quantity at the two ends of the loop does not always appear as the characteristics of the fault line.In the situation,existing steady and transient line selection techniques may cause mistake in line selection.The problem can be solved by increasing the number of alternative lines and using the change of each remaining line's zero-sequence admittance,before and after the resection of an exit line in the loop,to identify the fault line.And it can also be solved by taking the sum of the zero-sequence currents at both ends of the loop into the line selection comparison.Simulation and field data verify the correctness of the fault characteristics and the effectiveness of the line selection methods.
The existing line selection technologies of small current grounding fault are all based on radiating lines.However,the case of bus line loop will appear under certain circumstances,and then the characteristics of the grounding fault will change,which means the existing line selection methods need to be updated.In this paper,a compound network of single-phase grounding fault in distribution network with loop is established.After then,the distribution characteristics of the steady and transient zero-sequence currents at the end of the loop are derived,and the adaptability of the existing line selection methods is analyzed.The results show that,in the case of loop grounding,with the difference of the line parameters and the location of the fault,the electrical quantity at the two ends of the loop does not always appear as the characteristics of the fault line.In the situation,existing steady and transient line selection techniques may cause mistake in line selection.The problem can be solved by increasing the number of alternative lines and using the change of each remaining line's zero-sequence admittance,before and after the resection of an exit line in the loop,to identify the fault line.And it can also be solved by taking the sum of the zero-sequence currents at both ends of the loop into the line selection comparison.Simulation and field data verify the correctness of the fault characteristics and the effectiveness of the line selection methods.
引文
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[12]薛永端,冯祖仁,徐丙垠,等.基于暂态零序电流比较的小电流接地选线研究[J].电力系统自动化,2003,27(9):48-53.XUE Yongduan,FENG Zuren,XU Bingyin,et al.Earth fault protection in non-solidly earthed network based on transient zero sequence current comparison[J].Automation of Electric Power Systems,2003,27(9):48-53.
[13]束洪春,朱梦梦,黄文珍,等.基于暂态零序电流时频特征量的配网故障选线方法[J].电力自动化设备,2013,33(9):1-6.SHU Hongchun,ZHU Mengmeng,HUANG Wenzhen,et al.Faulty line selection based on time-frequency characteristics of transient zero-sequence current[J].Electric Power Automation Equipment,2013,33(9):1-6.
[14]薛永端.基于暂态特征信息的配电网单相接地故障检测研究[D].西安:西安交通大学,2003.XUE Yongduan.Earth fault detection based on characteristic transient information in non-solidly earthed network[D].Xi’an:Xi’an Jiaotong University,2003.
[15]曾祥君,尹项根,张哲,等.零序导纳法馈线接地保护的研究[J].中国电机工程学报,2001,21(4):5-10.ZENG Xiangjun,YIN Xianggen,ZHANG Zhe,et al.Study on feeder grounding fault protection based on zero sequence admittance[J].Proceedings of the CSEE,2001,21(4):5-10.
[16]易东,李群湛,黄彦全.零序导纳法接地选线保护原理[J].电力自动化设备,2002,22(10):40-42.YI Dong,LI Qunzhan,HUANG Yanquan.Principle of selective grounding fault protection based on zero sequence admittance[J].Electric Power Automation Equipment,2002,22(10):40-42.
[2]卢国辉.10kV配电线路环网现状及应用分析[J].科技创新导报,2016(27):7-8.LU Guohui.Status and application analysis of 10 kV loop networks[J].Science and Technology Innovation Herald,2016(27):7-8.
[3]LI Xingchen,LI Lin,WU Han.Analysis on the failure of distribution network loop[C]//Proceedings of the 2011International Conference on Frontiers in Computer Education(ICFCE 2011),December 1-2,2011,Sanya,China:5p.
[4]葛乐,陆文涛,袁晓冬,等.背靠背柔性直流互联的有源配电网合环优化运行[J].电力系统自动化,2017,41(6):135-141.DOI:10.7500/AEPS20160608008.GE Le,LU Wentao,YUAN Xiaodong,et al.Back-to-back VSC-HVDC based loop closed optimal operation for active distribution network[J].Automation of Electric Power Systems,2017,41(6):135-141.DOI:10.7500/AEPS20160608008.
[5]齐郑,杨以涵.中性点非有效接地系统单相接地选线技术分析[J].电力系统自动化,2004,28(14):1-5.QI Zheng,YANG Yihan.Analysis of technology of fault line selection for single-phase-to-earth faults in neutral point noneffectively grounded system[J].Automation of Electric Power Systems,2004,28(14):1-5.
[6]ZAMORA I,MAZON A J,SAGASTABEITIA K J,et al.New method for detecting low current faults in electrical distribution systems[J].IEEE Transactions on Power Delivery,2007,22(4):2072-2079.
[7]WELFONDER T,LEITLOFF V,FENILLET R,et al.Location strategies and evaluation of detection algorithms for earth faults in compensated MV distribution systems[J].IEEETransactions on Power Delivery,2002,17(4):1121-1128.
[8]齐郑,庄舒仪,刘自发,等.基于并联电阻扰动信号的配电网故障定位方法分析[J].电力系统自动化,2018,42(9):195-200.DOI:10.7500/AEPS20170817005.QI Zheng,ZHUANG Shuyi,LIU Zifa,et al.Analysis on distribution network fault location method based on parallel resistance disturbed signal injection[J].Automation of Electric Power Systems,2018,42(9):195-200.DOI:10.7500/AEPS20170817005.
[9]薛永端,徐丙垠,冯祖仁,等.小电流接地故障暂态方向保护原理研究[J].中国电机工程学报,2003,23(7):51-56.XUE Yongduan,XU Bingyin,FENG Zuren,et al.The principle of directional earth fault protection using zero sequence transients in non-solid earthed network[J].Proceedings of the CSEE,2003,23(7):51-56.
[10]配电网技术导则:Q/GDW 10370-2016[S].北京:中国电力出版社,2017.Technical guidelines for distribution network:Q/GDW10370-2016[S].Beijing:China Electric Power Press,2017.
[11]小电流接地选线装置技术规范:Q/CSG 10040-2012[S].北京:中国电力出版社,2013.Specification for fault line selection device in neutral point ineffectively grounded system:Q/CSG 10040-2012[S].Beijing:China Electric Power Press,2013.
[12]薛永端,冯祖仁,徐丙垠,等.基于暂态零序电流比较的小电流接地选线研究[J].电力系统自动化,2003,27(9):48-53.XUE Yongduan,FENG Zuren,XU Bingyin,et al.Earth fault protection in non-solidly earthed network based on transient zero sequence current comparison[J].Automation of Electric Power Systems,2003,27(9):48-53.
[13]束洪春,朱梦梦,黄文珍,等.基于暂态零序电流时频特征量的配网故障选线方法[J].电力自动化设备,2013,33(9):1-6.SHU Hongchun,ZHU Mengmeng,HUANG Wenzhen,et al.Faulty line selection based on time-frequency characteristics of transient zero-sequence current[J].Electric Power Automation Equipment,2013,33(9):1-6.
[14]薛永端.基于暂态特征信息的配电网单相接地故障检测研究[D].西安:西安交通大学,2003.XUE Yongduan.Earth fault detection based on characteristic transient information in non-solidly earthed network[D].Xi’an:Xi’an Jiaotong University,2003.
[15]曾祥君,尹项根,张哲,等.零序导纳法馈线接地保护的研究[J].中国电机工程学报,2001,21(4):5-10.ZENG Xiangjun,YIN Xianggen,ZHANG Zhe,et al.Study on feeder grounding fault protection based on zero sequence admittance[J].Proceedings of the CSEE,2001,21(4):5-10.
[16]易东,李群湛,黄彦全.零序导纳法接地选线保护原理[J].电力自动化设备,2002,22(10):40-42.YI Dong,LI Qunzhan,HUANG Yanquan.Principle of selective grounding fault protection based on zero sequence admittance[J].Electric Power Automation Equipment,2002,22(10):40-42.