谐振接地系统单相断线故障分析
|
摘要
配电线路断线故障逐年增加,缺乏简单有效的检测手段。针对谐振接地系统,建立了单相断线故障模型。考虑断线位置、故障线路对地电容占系统对地电容的比例和负载阻抗大小的影响,分析了断口前后中性点电压、各相电压与线电压的变化特征。结果表明:断口前后故障相电压变化有明显差异,而非故障相电压变化相同;断口前方线电压没有变化,后方故障相与两健全相之间的线电压幅值之和等于两健全相电压之间的线电压,且相位相反或相同。用MATLAB仿真验证了理论分析的正确性。研究成果可为谐振接地系统单相断线故障的检测与定位提供理论依据。
The number of open faults on distribution lines is increasing year by year;however,simple and effective detection methods are scarce.In this paper,based on a resonant grounded system,a model of single-phase open fault is established,which takes into account the location of break points,the ratio of fault line grounding capacitance to system grounding capacitance,and the magnitude of load impedance.Moreover,the changing characteristic of voltage at neutral point,phase voltages,and line voltages on the supply and load sides are analyzed.Results show that there is a significant difference in the fault phase voltage,but the voltage changes in healthy phases are identical;the line voltages on the supply side are almost unchanged,while on the load side,the sum of amplitude of line voltages between the fault phase and two healthy phases is equal to that of the line voltage between two healthy phases,with phases being opposite or identical.Finally,the theoretical analysis is verified by MATLAB simulation.The research results in this paper can provide a theoretical basis for the detection and location of single-phase open fault in the resonant grounded system.
The number of open faults on distribution lines is increasing year by year;however,simple and effective detection methods are scarce.In this paper,based on a resonant grounded system,a model of single-phase open fault is established,which takes into account the location of break points,the ratio of fault line grounding capacitance to system grounding capacitance,and the magnitude of load impedance.Moreover,the changing characteristic of voltage at neutral point,phase voltages,and line voltages on the supply and load sides are analyzed.Results show that there is a significant difference in the fault phase voltage,but the voltage changes in healthy phases are identical;the line voltages on the supply side are almost unchanged,while on the load side,the sum of amplitude of line voltages between the fault phase and two healthy phases is equal to that of the line voltage between two healthy phases,with phases being opposite or identical.Finally,the theoretical analysis is verified by MATLAB simulation.The research results in this paper can provide a theoretical basis for the detection and location of single-phase open fault in the resonant grounded system.
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,2009.
[2]梁睿,杨学君,彭楠,等(Liang Rui,Yang Xuejun,Peng Nan,et al).基于广域零序分布电压特征的小电流接地选线方法(A method for single-line-to-ground fault feeder selection based on the characteristic of wide area zero sequence voltage)[J].电网技术(Power System Technology),2016,40(10):3236-3242.
[3]郭丽伟,薛永端,张林利,等(Guo Liwei,Xue Yongduan,Zhang Linli,et al).含分布式电源的小电阻接地方式配电网单相接地故障分析(Analysis of single-phase earth fault in low resistance grounded distribution network containing DG)[J].电力系统自动化(Automation of Electric Power Systems),2015,39(20):116-123.
[4]薛太林,张建新(Xue Taili,Zhang Jianxin).基于零序特征量的小电流接地系统单相接地故障仿真分析(Simulation analysis of single phase toground fault in small current neutral grounding system based on zero sequence characteristic)[J].自动化技术与应用(Techniques of Automation and Applications),2018,37(6):79-84.
[5]潘本仁,管廷龙,桂小智,等(Pan Benren,Guan Tinglong,Gui Xiaozhi,et al).不接地系统高阻接地故障特征及选线适用性分析(Characteristics of high-resistance grounding fault in isolated neutral systems and the adaptability analysis of fault line selection)[J].电力系统及其自动化学报(Proceedings of the CSU-EPSA),2017,29(10):52-59.
[6]王庆华(Wang Qinghua).配电线路断线故障的分析(Analysis of distribution line break failure)[J].广西水利水电(Guangxi Water Resources&Hydropower Engineering),2011(6):57-60.
[7]王琦,杨梅(Wang Qi,Yang Mei).小电流接地系统线路断线分析(An analysis of line breaking in undercurrent earthed system)[J].电力学报(Journal of Electric Power),2007,22(1):121-124.
[8]张慧芬,潘贞存,桑在中(Zhang Huifen,Pan Zhencun,Sang Zaizhong).小电流接地系统单相断线加接地故障的分析(Analysis of complex line breaking and grounding fault in the power system with neutral point indirectly grounded)[J].继电器(Relay),2004,32(18):6-9.
[9]张慧芬,桑在中(Zhang Huifen,Sang Zaizhong).架空线单相断线接地复故障分析(Analysis of single-phase grounding fault with line-broken on overhead transmission lines)[J].中国电力(Electric Power),2013,46(2):65-71.
[10]孙旭娜,张慧芬,田质广(Sun Xuna,Zhang Huifen,Tian Zhiguang).接地点在变电站侧断线接地复故障分析(Analysis of single-phase line-broken with earth fault at substation side)[J].济南大学学报:自然科学版(Journal of University of Jinan:Science and Technology),2013,27(1):26-33.
[11]韩凤玲,王毅,许承斌,等(Han Fengling,Wang Yi,Xu Chengbin,et al).树型分支电网单相断线兼接地故障特征(Fault features of line break with short-circuit for treetype distribution line)[J].哈尔滨工业大学学报(Journal of Harbin Institute of Technology),1998,30(2):16-20.
[12]马腾(Ma Teng).10 kV配电线路断线故障检测与定位研究(Line-break Fault Detection and Location of 10 kVDistribution Line)[D].济南:山东大学电气工程学院(Jinan:College of Electrical Engineering,Shandong University),2013.
[13]李志远,曹丽丽,薛永端,等(Li Zhiyuan,Cao Lili,Xue Yongduan,et al).不接地系统单相断线兼电源侧接地故障分析(Analysis of single-phase grounding faults with line-broken on supply side in ungrounded system)[J].供用电(Distribution&Utilization),2018,35(5):7-13.
[14]朱玲玲,李长凯,张华中,等(Zhu Lingling,Li Changkai,Zhang Huazhong,et al).配电网单相断线故障负序电流分析及选线(Negative sequence current distributing and single-phase open-line fault protection in distribution network)[J].电力系统保护与控制(Power System Protection and Control),2009,37(9):35-38,43.
[15]朱玲玲,张华中,王正刚,等(Zhu Lingling,Zhang Huazhong,Wang Zhenggang,et al).基于小波神经网络单相断线故障选线和定位(Single-phase open-line fault selection and location based on wavelet neural networks)[J].电力系统保护与控制(Power System Protection and Control),2011,39(4):12-17.
[16]尤毅,刘东,李亮,等(You Yi,Liu Dong,Li Liang,et al).基于负荷监测仪的10 kV架空线单相断线不接地故障区域判定(Detection method based on load monitoring for10 kV overhead line single-phase ungrounded open fault area)[J].电力系统保护与控制(Power System Protection and Control),2012,40(19):144-149.
[17]屈刚,李长凯(Qu Gang,Li Changkai).配电网架空线路断线故障定位(Fault locating of non-grounding line break in distribution network)[J].电力自动化设备(Electric Power Automation Equipment),2005,25(12):35-38.
[18]谢菁,薛永端,徐丙垠(Xie Jing,Xue Yongduan,Xu Bingyin).小电流接地系统不对称电压有源补偿控制方法(An active compensation and control method of asymmetrical voltage in non-solidly grounded system)[J].电力系统自动化(Automation of Electric Power Systems),2015,39(5):115-121.
[19]陈忠仁,吴维宁,陈家宏,等(Chen Zhongren,Wu Weining,Chen Jiahong,et al).补偿电网阻尼率及脱谐度问题研究(Study on damping rate and out-of-resonance degree of power compensation network)[J].继电器(Relay),2005,33(4):36-39,44.
[20]王艳松.电力工程[M].青岛:中国石油大学出版社,2012.
[21]李福寿.中性点非有效接地电网的运行[M].北京:水利电力出版社,1993.--------
[2]梁睿,杨学君,彭楠,等(Liang Rui,Yang Xuejun,Peng Nan,et al).基于广域零序分布电压特征的小电流接地选线方法(A method for single-line-to-ground fault feeder selection based on the characteristic of wide area zero sequence voltage)[J].电网技术(Power System Technology),2016,40(10):3236-3242.
[3]郭丽伟,薛永端,张林利,等(Guo Liwei,Xue Yongduan,Zhang Linli,et al).含分布式电源的小电阻接地方式配电网单相接地故障分析(Analysis of single-phase earth fault in low resistance grounded distribution network containing DG)[J].电力系统自动化(Automation of Electric Power Systems),2015,39(20):116-123.
[4]薛太林,张建新(Xue Taili,Zhang Jianxin).基于零序特征量的小电流接地系统单相接地故障仿真分析(Simulation analysis of single phase toground fault in small current neutral grounding system based on zero sequence characteristic)[J].自动化技术与应用(Techniques of Automation and Applications),2018,37(6):79-84.
[5]潘本仁,管廷龙,桂小智,等(Pan Benren,Guan Tinglong,Gui Xiaozhi,et al).不接地系统高阻接地故障特征及选线适用性分析(Characteristics of high-resistance grounding fault in isolated neutral systems and the adaptability analysis of fault line selection)[J].电力系统及其自动化学报(Proceedings of the CSU-EPSA),2017,29(10):52-59.
[6]王庆华(Wang Qinghua).配电线路断线故障的分析(Analysis of distribution line break failure)[J].广西水利水电(Guangxi Water Resources&Hydropower Engineering),2011(6):57-60.
[7]王琦,杨梅(Wang Qi,Yang Mei).小电流接地系统线路断线分析(An analysis of line breaking in undercurrent earthed system)[J].电力学报(Journal of Electric Power),2007,22(1):121-124.
[8]张慧芬,潘贞存,桑在中(Zhang Huifen,Pan Zhencun,Sang Zaizhong).小电流接地系统单相断线加接地故障的分析(Analysis of complex line breaking and grounding fault in the power system with neutral point indirectly grounded)[J].继电器(Relay),2004,32(18):6-9.
[9]张慧芬,桑在中(Zhang Huifen,Sang Zaizhong).架空线单相断线接地复故障分析(Analysis of single-phase grounding fault with line-broken on overhead transmission lines)[J].中国电力(Electric Power),2013,46(2):65-71.
[10]孙旭娜,张慧芬,田质广(Sun Xuna,Zhang Huifen,Tian Zhiguang).接地点在变电站侧断线接地复故障分析(Analysis of single-phase line-broken with earth fault at substation side)[J].济南大学学报:自然科学版(Journal of University of Jinan:Science and Technology),2013,27(1):26-33.
[11]韩凤玲,王毅,许承斌,等(Han Fengling,Wang Yi,Xu Chengbin,et al).树型分支电网单相断线兼接地故障特征(Fault features of line break with short-circuit for treetype distribution line)[J].哈尔滨工业大学学报(Journal of Harbin Institute of Technology),1998,30(2):16-20.
[12]马腾(Ma Teng).10 kV配电线路断线故障检测与定位研究(Line-break Fault Detection and Location of 10 kVDistribution Line)[D].济南:山东大学电气工程学院(Jinan:College of Electrical Engineering,Shandong University),2013.
[13]李志远,曹丽丽,薛永端,等(Li Zhiyuan,Cao Lili,Xue Yongduan,et al).不接地系统单相断线兼电源侧接地故障分析(Analysis of single-phase grounding faults with line-broken on supply side in ungrounded system)[J].供用电(Distribution&Utilization),2018,35(5):7-13.
[14]朱玲玲,李长凯,张华中,等(Zhu Lingling,Li Changkai,Zhang Huazhong,et al).配电网单相断线故障负序电流分析及选线(Negative sequence current distributing and single-phase open-line fault protection in distribution network)[J].电力系统保护与控制(Power System Protection and Control),2009,37(9):35-38,43.
[15]朱玲玲,张华中,王正刚,等(Zhu Lingling,Zhang Huazhong,Wang Zhenggang,et al).基于小波神经网络单相断线故障选线和定位(Single-phase open-line fault selection and location based on wavelet neural networks)[J].电力系统保护与控制(Power System Protection and Control),2011,39(4):12-17.
[16]尤毅,刘东,李亮,等(You Yi,Liu Dong,Li Liang,et al).基于负荷监测仪的10 kV架空线单相断线不接地故障区域判定(Detection method based on load monitoring for10 kV overhead line single-phase ungrounded open fault area)[J].电力系统保护与控制(Power System Protection and Control),2012,40(19):144-149.
[17]屈刚,李长凯(Qu Gang,Li Changkai).配电网架空线路断线故障定位(Fault locating of non-grounding line break in distribution network)[J].电力自动化设备(Electric Power Automation Equipment),2005,25(12):35-38.
[18]谢菁,薛永端,徐丙垠(Xie Jing,Xue Yongduan,Xu Bingyin).小电流接地系统不对称电压有源补偿控制方法(An active compensation and control method of asymmetrical voltage in non-solidly grounded system)[J].电力系统自动化(Automation of Electric Power Systems),2015,39(5):115-121.
[19]陈忠仁,吴维宁,陈家宏,等(Chen Zhongren,Wu Weining,Chen Jiahong,et al).补偿电网阻尼率及脱谐度问题研究(Study on damping rate and out-of-resonance degree of power compensation network)[J].继电器(Relay),2005,33(4):36-39,44.
[20]王艳松.电力工程[M].青岛:中国石油大学出版社,2012.
[21]李福寿.中性点非有效接地电网的运行[M].北京:水利电力出版社,1993.--------
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |