考虑系统不对称的小电流接地故障相识别
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摘要
针对存在不对称情况的不接地系统与谐振接地系统,分析了接地故障前、后三相电压幅值的变化规律,提出可适应系统不对称的接地相识别方法:故障后若只有一相电压幅值相较于故障前降低,则此相为故障相;若有两相电压幅值降低,则中性点不接地系统中电压幅值升高相的滞后相为故障相,谐振接地系统过补偿状态下电压幅值升高相的超前相为故障相。所提方法简单实用,只需接地故障前、后三相电压幅值信息即可准确识别不对称状态下的接地故障相,且不受电压互感器测量误差的影响,在过渡电阻较大时也可准确识别故障相。数字仿真验证了理论分析和所提方法的正确性。
Aiming at ungrounding system and resonant grounded system with asymmetry,the magnitude variation rule of three-phase voltage before and after fault is analyzed. A grounding phase identification method suitable for asymmetric system is proposed. If there is only one phase whose voltage magnitude decreases after grounding fault compared with that before fault,this phase can be judged as fault phase. If two phase voltage magnitudes decrease,there are two possibilities:for neutral ungrounding system the lag phase of the phases whose voltage magnitude increase will be the fault phase;for the resonant grounded system,the lead phase of the phases whose voltage magnitude increase will be the fault phase. The proposed method is simple and practical,which can accurately identify the fault phase under asymmetrical state only by using the magnitude information of three-phase voltage before and after ground fault. Moreover,it can avoid the effect of measurement error of voltage transformer and accurately identify the fault phase when the transition resistance is large. The accuracy of the theoretical analysis and proposed method is verified by simulation.
Aiming at ungrounding system and resonant grounded system with asymmetry,the magnitude variation rule of three-phase voltage before and after fault is analyzed. A grounding phase identification method suitable for asymmetric system is proposed. If there is only one phase whose voltage magnitude decreases after grounding fault compared with that before fault,this phase can be judged as fault phase. If two phase voltage magnitudes decrease,there are two possibilities:for neutral ungrounding system the lag phase of the phases whose voltage magnitude increase will be the fault phase;for the resonant grounded system,the lead phase of the phases whose voltage magnitude increase will be the fault phase. The proposed method is simple and practical,which can accurately identify the fault phase under asymmetrical state only by using the magnitude information of three-phase voltage before and after ground fault. Moreover,it can avoid the effect of measurement error of voltage transformer and accurately identify the fault phase when the transition resistance is large. The accuracy of the theoretical analysis and proposed method is verified by simulation.
引文
[1]要焕年,曹梅月.电力系统谐振接地[M].北京:中国电力出版社,2004:34-47.
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[12]刘玉友,姚金霞,任万彬,等.35 kV海底电缆电压异常原因分析及对策[J].山东电力技术,2008(2):56-58.LIU Yuyou,YAO Jinxia,REN Wanbin,et al.Analysis and countermeasure on abnormal voltage in 35 kV submarine cable[J].Shandong Dianli Jishu,2008(2):56-58.
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[14]谢菁,薛永端,徐丙垠.小电流接地系统不对称电压有源补偿控制方法[J].电力系统自动化,2015,39(5):115-121.XIE Jing,XUE Yongduan,XU Bingyin.An active compensation and control method of asymmetrical voltage in non-solidly grounded system[J].Automation of Electric Power Systems,2015,39(5):115-121.
[15]何锡祺,齐郑,杨以涵,等.并联电抗器组合式消弧线圈的研究[J].电力系统自动化,2008,32(3):92-96.HE Xiqi,QI Zheng,YANG Yihan,et al.Research on combined arc suppression coil with shunt reactor[J].Automation of Electric Power Systems,2008,32(3):92-96.
[16]束洪春,徐亮,彭仕欣,等.谐振接地电网故障选线相关分析法[J].电力自动化设备,2008,28(9):6-9.SHU Hongchun,XU Liang,PENG Shixin,et al.Correlation analysis for faulty feeder detection in resonant earthed system[J].Electric Power Automation Equipment,2008,28(9):6-9.
[17]曾祥君,易文韬,刘张磊,等.注入信号精确谐振测量配电网电容电流新技术[J].电力系统自动化,2008,32(4):77-80.ZENG Xiangjun,YI Wentao,LIU Zhanglei,et al.A novel technique of capacitive current resonance measurement with signal injected for distribution networks[J].Automation of Electric Power Systems,2008,32(4):77-80.
[18]麦瑞坤,何正友,符玲,等.基于电流行波能量和小波变换的输电线路故障选相研究[J].电网技术,2007,31(3):38-43.MAI Ruikun,HE Zhengyou,FU Ling,et al.Study on faulty phase selection based on energy of current traveling wave and wavelet transform[J].Power System Technology,2007,31(3):38-43.
[19]陈怡,蒋平,万秋兰,等.电力系统分析[M].北京:中国电力出版社,2005:7-9.
[2]王崇林.中性点接地方式与消弧线圈[M].徐州:中国矿业大学出版社,1999:9-38.
[3]吴乐鹏,黄纯,林达斌,等.基于暂态小波能量的小电流接地故障选线新方法[J].电力自动化设备,2013,33(5):70-75.WU Lepeng,HUANG Chun,LIN Dabin,et al.Faulty line selection based on transient wavelet energy for non-solid-earthed network[J].Electric Power Automation Equipment,2013,33(5):70-75.
[4]朱珂,王怡轩,倪建.主动干扰技术在消弧线圈接地系统故障选线中的应用[J].电力自动化设备,2017,37(10):189-196.ZHU Ke,WANG Yixuan,NI Jian.Application of active disturbance technology in faulty line selection of arc suppression coil grounding system[J].Electric Power Automation Equipment,2017,37(10):189-196.
[5]徐玉琴,陈志业,李鹏.晶闸管投切电容式消弧线圈的设计与应用研究[J].电力系统自动化,2001,25(13):38-41.XU Yuqin,CHEN Zhiye,LI Peng.Design and application research on arc suppression coil with thyristor series capacitors[J].Automation of Electric Power Systems,2001,25(13):38-41.
[6]张毅,薛永端,宋华茂,等.低阻接地故障有源电压消弧算法性能分析和改进[J].电网技术,2017,41(1):314-321.ZHANG Yi,XUE Yongduan,SONG Huamao,et al.Performance analysis and improvement of active voltage arc-suppression algorithm about low resistance grounding fault[J].Automation of Electric Power Systems,2017,41(1):314-321.
[7]XU Yao,ZENG Xiangjun,LIU Zhanglei,et al.Novel control techniques of petersen-coil[C]∥IEEE International Conference on Industrial Technology.Chengdu,China:IEEE,2008:1-4.
[8]秦光培.单相接地时电网各电压变化规律及其应用[J].昆明理工大学学报,1998,23(5):11-16.QIN Guangpei.Each voltage variable law and it's application of the network when single phase-ground[J].Journal of Kunming University of Science and Technology,1998,23(5):11-16.
[9]徐波,张建文,蔡旭,等.电网不对称条件下小电流接地系统接地相辨识[J].电工技术学报,2011,26(12):175-182.XU Bo,ZHANG Jianwen,CAI Xu,et al.Grounding phase determination in non-effective grounding systems in case of unsymmetrical voltage[J].Transactions of China Electrotechnical Society,2011,26(12):175-182.
[10]刘宝稳,王崇林,李晓波.不对称电网不完全接地故障零序电压轨迹及应用[J].中国电机工程学报,2014,34(28):4959-4967.LIU Baowen,WANG Chonglin,LI Xiaobo.Analysis and application of zero-sequence voltage of single-phase ground fault asymmetrical system[J].Proceedings of the CSEE,2014,34(28):4959-4967.
[11]杨耿杰.电力系统不对称计算[M].北京:中国电力出版社,2008:22-27.
[12]刘玉友,姚金霞,任万彬,等.35 kV海底电缆电压异常原因分析及对策[J].山东电力技术,2008(2):56-58.LIU Yuyou,YAO Jinxia,REN Wanbin,et al.Analysis and countermeasure on abnormal voltage in 35 kV submarine cable[J].Shandong Dianli Jishu,2008(2):56-58.
[13]汤放奇,李景禄,曾祥君,等.补偿电网中性点电压异常的原因及对策[J].高电压技术,2005,31(4):12-13.TANG Fangqi,LI Jinglu,ZENG Xiangjun,et al.Analysis of abnormal displacement voltage of neutral points in compensated electric network and its control measure[J].High Voltage Engineering,2005,31(4):12-13.
[14]谢菁,薛永端,徐丙垠.小电流接地系统不对称电压有源补偿控制方法[J].电力系统自动化,2015,39(5):115-121.XIE Jing,XUE Yongduan,XU Bingyin.An active compensation and control method of asymmetrical voltage in non-solidly grounded system[J].Automation of Electric Power Systems,2015,39(5):115-121.
[15]何锡祺,齐郑,杨以涵,等.并联电抗器组合式消弧线圈的研究[J].电力系统自动化,2008,32(3):92-96.HE Xiqi,QI Zheng,YANG Yihan,et al.Research on combined arc suppression coil with shunt reactor[J].Automation of Electric Power Systems,2008,32(3):92-96.
[16]束洪春,徐亮,彭仕欣,等.谐振接地电网故障选线相关分析法[J].电力自动化设备,2008,28(9):6-9.SHU Hongchun,XU Liang,PENG Shixin,et al.Correlation analysis for faulty feeder detection in resonant earthed system[J].Electric Power Automation Equipment,2008,28(9):6-9.
[17]曾祥君,易文韬,刘张磊,等.注入信号精确谐振测量配电网电容电流新技术[J].电力系统自动化,2008,32(4):77-80.ZENG Xiangjun,YI Wentao,LIU Zhanglei,et al.A novel technique of capacitive current resonance measurement with signal injected for distribution networks[J].Automation of Electric Power Systems,2008,32(4):77-80.
[18]麦瑞坤,何正友,符玲,等.基于电流行波能量和小波变换的输电线路故障选相研究[J].电网技术,2007,31(3):38-43.MAI Ruikun,HE Zhengyou,FU Ling,et al.Study on faulty phase selection based on energy of current traveling wave and wavelet transform[J].Power System Technology,2007,31(3):38-43.
[19]陈怡,蒋平,万秋兰,等.电力系统分析[M].北京:中国电力出版社,2005:7-9.