小电流接地故障无功功率分析及选线新方法
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摘要
对于谐振接地系统的单相接地故障,由于现场普遍存在电压互感器(PT)和电流互感器(CT)极性反接的现象,当仅仅利用故障的暂态无功功率方向进行选线时极易发生误选。分析了PT、CT极性反接对故障暂态和工频无功功率的影响,提出一种利用故障的工频无功功率对暂态无功功率进行修正再选线的新方法。即:修正后的暂态无功功率为负值的线路为故障线路,如果所有出线修正后的暂态无功功率都是正值则为母线接地。该方法可以忽略PT和CT的极性反接影响,扩大了选线适用范围。仿真和现场的数据证明了该方法的可行性。
Because of the incorrect polarity connection of voltage transformer and current transformer in field, faulty feeder selection based on transient reactive power direction leads to wrong easily when there is a single-phase earth fault in resonant grounding system. In this paper, the effect of the incorrect polarity connection of voltage transformer and current transformer on transient reactive power and power-frequency reactive power is analyzed. A novel method using the power-frequency reactive power to correct the transient reactive power for faulty feeder selection is proposed. The faulty feeder is the one which the corrected transient reactive power is negative. If all of the corrected transient reactive powers are positive, it is bus fault. The proposed method is independent of polarity connection of voltage transformer and current transformer, which enlarges the selection scope. The feasibility of the new method is verified by digital simulation and field fault data.
Because of the incorrect polarity connection of voltage transformer and current transformer in field, faulty feeder selection based on transient reactive power direction leads to wrong easily when there is a single-phase earth fault in resonant grounding system. In this paper, the effect of the incorrect polarity connection of voltage transformer and current transformer on transient reactive power and power-frequency reactive power is analyzed. A novel method using the power-frequency reactive power to correct the transient reactive power for faulty feeder selection is proposed. The faulty feeder is the one which the corrected transient reactive power is negative. If all of the corrected transient reactive powers are positive, it is bus fault. The proposed method is independent of polarity connection of voltage transformer and current transformer, which enlarges the selection scope. The feasibility of the new method is verified by digital simulation and field fault data.
引文
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[9]陈博博,屈卫锋,杨宏宇,等.小电流接地系统单相接地综合电弧模型与选线方法的研究[J].电力系统保护与控制,2016,44(16):1-7.CHEN Bobo,QU Weifeng,YANG Hongyu,et al.Research on single phase grounding arc model and line selection for neutral ineffective grounding system[J].Power System Protection and Control,2016,44(16):1-7.
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[12]毕见广,董新洲,周双喜.基于两相电流行波的接地选线方法[J].电力系统自动化,2004,28(19):17-22.BI Jianguang,DONG Xinzhou,ZHOU Shuangxi.Fault line selection based on two-phase current traveling wave[J].Automation of Electric Power Systems,2004,28(19):17-22.
[13]简金宝,王媛媛,曾祥君,等.基于系统聚类分析的馈线接地保护[J].电力系统自动化,2013,37(5):111-116.JIAN Jinbao,WANG Yuanyuan,ZENG Xiangjun,et al.Earth fault feeder detection based on hierarchical clustering analysis[J].Automation of Electric Power Systems,2013,37(5):111-116.
[14]高志鹏,张慧芬,孙旭娜.注入半波直流的小电流接地故障选线定位方法[J].电力系统保护与控制,2013,41(13):139-145.GAO Zhipeng,ZHANG Huifen,SUN Xuna.A method of fault line selection and fault point location with half-wave DC injection in distribution network[J].Power System Protection and Control,2013,41(13):139-145.
[15]明志强,许虎.经消弧线圈接地系统的中电阻快速选线方法[J].电网技术,2009,33(12):112-114.MING Zhiqiang,XU Hu.Method of fast grounding fault line selection with arc-suppression coil and median resistor[J].Power System Technology,2009,33(12):112-114.
[16]邹浩斌,胡少强,刘利平,等.基于小扰动原理的单相接地选线装置[J].继电器,2007,35(2):20-24.ZOU Haobin,HU Shaoqiang,LIU Liping,et al.Singlephase grounding selected-line equipment based on small disturbance theory[J].Relay,2007,35(2):20-24.
[17]薛永端,张秋凤,颜廷纯,等.综合暂态与工频信息的谐振接地系统小电流接地故障选线[J].电力系统自动化,2014,38(24):80-85.XUE Yongduan,ZHANG Qiufeng,YAN Tingchun,et al.Faulty feeder identification based on combined transient and power-frequency components in resonant grounded system[J].Automation of Electric Power Systems,2014,38(24):80-85.
[2]束洪春.配电网络故障选线[M].北京:机械工业出版社,2008.
[3]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.
[4]薛永端,徐丙垠,冯祖仁.基于Hilbert变换的非正弦电路无功及瞬时无功功率定义[J].电力系统自动化,2004,28(12):35-39.XUE Yongduan,XU Bingyin,FENG Zuren.Average and instantaneous reactive power of non-sinusoidal circuit based on Hilbert transformation[J].Automation of Electric Power Systems,2004,28(12):35-39.
[5]刘谋海,方涛,姜运,等.基于暂态主频分量相关性分析的故障选线方法[J].电力系统保护与控制,2016,44(2):74-79.LIU Mouhai,FANG Tao,JIANG Yun,et al.A new correlation analysis approach to fault line selection based on transient main-frequency components[J].Power System Protection and Control,2016,44(2):74-79.
[6]王铭,王宏伟,赵义明.模极大值均方根比在配网暂态接地故障选线中的应用研究[J].电力系统保护与控制,2014,42(17):50-54.WANG Ming,WANG Hongwei,ZHAO Yiming.Application research for the root mean square ratio of modulus maxima in the distribution network transient fault line selection[J].Power System Protection and Control,2014,42(17):50-54.
[7]闫光太,梁甲文,王新涛,等.利用暂态幅值故障测度的谐振电网故障选线[J].电力系统保护与控制,2015,43(8):64-68.YAN Guangtai,LIANG Jiawen,WANG Xintao,et al.A fault selection method for resonant grounding system based on transient amplitude fault measure[J].Power System Protection and Control,2015,43(8):64-68.
[8]张姝,何正友,王玘,等.暂态零序电荷-电压特征与支持向量机结合的谐振接地系统故障选线研究[J].电力系统保护与控制,2013,41(12):71-78.ZHANG Shu,HE Zhengyou,WANG Qi,et al.Fault line selection of resonant grounding system based on the characteristics of charge-voltage in the transient zero sequence and support vector machine[J].Power System Protection and Control,2013,41(12):71-78.
[9]陈博博,屈卫锋,杨宏宇,等.小电流接地系统单相接地综合电弧模型与选线方法的研究[J].电力系统保护与控制,2016,44(16):1-7.CHEN Bobo,QU Weifeng,YANG Hongyu,et al.Research on single phase grounding arc model and line selection for neutral ineffective grounding system[J].Power System Protection and Control,2016,44(16):1-7.
[10]赖平,周想凌,邱丹.小电流接地系统暂态电流频率特性分析及故障选线方法研究[J].电力系统保护与控制,2015,43(4):51-57.LAI Ping,ZHOU Xiangling,QIU Dan.Research on transient-current frequency analysis and faulty line detecting method in indirectly grounding power system[J].Power System Protection and Control,2015,43(4):51-57.
[11]穆世霞,田青,曹苒,等.线路综合故障电磁暂态建模与仿真[J].陕西电力,2015,43(5):5-49.MU Shixia,TIAN Qing,CAO Ran,et al.Electromagnetic transient modeling and simulation for line integrated fault[J].Shaanxi Electric Power,2015,43(5):45-49.
[12]毕见广,董新洲,周双喜.基于两相电流行波的接地选线方法[J].电力系统自动化,2004,28(19):17-22.BI Jianguang,DONG Xinzhou,ZHOU Shuangxi.Fault line selection based on two-phase current traveling wave[J].Automation of Electric Power Systems,2004,28(19):17-22.
[13]简金宝,王媛媛,曾祥君,等.基于系统聚类分析的馈线接地保护[J].电力系统自动化,2013,37(5):111-116.JIAN Jinbao,WANG Yuanyuan,ZENG Xiangjun,et al.Earth fault feeder detection based on hierarchical clustering analysis[J].Automation of Electric Power Systems,2013,37(5):111-116.
[14]高志鹏,张慧芬,孙旭娜.注入半波直流的小电流接地故障选线定位方法[J].电力系统保护与控制,2013,41(13):139-145.GAO Zhipeng,ZHANG Huifen,SUN Xuna.A method of fault line selection and fault point location with half-wave DC injection in distribution network[J].Power System Protection and Control,2013,41(13):139-145.
[15]明志强,许虎.经消弧线圈接地系统的中电阻快速选线方法[J].电网技术,2009,33(12):112-114.MING Zhiqiang,XU Hu.Method of fast grounding fault line selection with arc-suppression coil and median resistor[J].Power System Technology,2009,33(12):112-114.
[16]邹浩斌,胡少强,刘利平,等.基于小扰动原理的单相接地选线装置[J].继电器,2007,35(2):20-24.ZOU Haobin,HU Shaoqiang,LIU Liping,et al.Singlephase grounding selected-line equipment based on small disturbance theory[J].Relay,2007,35(2):20-24.
[17]薛永端,张秋凤,颜廷纯,等.综合暂态与工频信息的谐振接地系统小电流接地故障选线[J].电力系统自动化,2014,38(24):80-85.XUE Yongduan,ZHANG Qiufeng,YAN Tingchun,et al.Faulty feeder identification based on combined transient and power-frequency components in resonant grounded system[J].Automation of Electric Power Systems,2014,38(24):80-85.