基于基波电势分布特征的大型发电机定子接地故障定位方法
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摘要
提出一种基于基波电势分布特征的定子接地故障定位方法,该方法按各相各分支定子线圈的实际连接关系,确定发电机中性点至接地故障点的基波电势,建立了该基波电势、机端三相基波电压、基波零序电压、接地过渡电阻阻值之间的数学关系,准确定位定子接地故障,并对波绕组发电机故障定位中的特殊情况进行了分析。采用基于准分布电容参数的定子接地故障仿真模型验证了所提方法的有效性。最后对现场实际故障案例进行分析,进一步验证了所提方法的准确性,其可大幅缩短现场故障检修的时间。
A stator grounding fault location method based on potential distribution characteristics of fundamental wave is proposed. The fundamental wave potential between the neutral point of the generator and the grounding fault point is determined according to the actual connection relationship of the stator coils of each branch of each phase. The mathematical relationship of the fundamental wave potential,three-phase fundamental wave voltage of the machine terminal,fundamental wave zero-sequence voltage and grounding transition resistance is established,by which,the stator grounding fault is accurately located. The special situation in the fault location of the wave winding generator is analyzed. Then,a stator grounding fault simulation model based on quasi-distributed capacitance parameters is used to verify the effectiveness of the proposed method. Finally,the actual fault cases in the field are analyzed,and the results further verify the accuracy of the proposed method and that it can greatly shorten the on-site trouble shoo-ting time.
A stator grounding fault location method based on potential distribution characteristics of fundamental wave is proposed. The fundamental wave potential between the neutral point of the generator and the grounding fault point is determined according to the actual connection relationship of the stator coils of each branch of each phase. The mathematical relationship of the fundamental wave potential,three-phase fundamental wave voltage of the machine terminal,fundamental wave zero-sequence voltage and grounding transition resistance is established,by which,the stator grounding fault is accurately located. The special situation in the fault location of the wave winding generator is analyzed. Then,a stator grounding fault simulation model based on quasi-distributed capacitance parameters is used to verify the effectiveness of the proposed method. Finally,the actual fault cases in the field are analyzed,and the results further verify the accuracy of the proposed method and that it can greatly shorten the on-site trouble shoo-ting time.
引文
[1] 王维俭.电气主设备继电保护原理与应用[M].2版.北京:中国电力出版社,2002:223-245.
[2] 毕大强.大型水轮发电机定子绕组单相接地故障及保护方案的研究[D].北京:清华大学,2003.BI Daqiang.Studies on stator ground fault and its protection for large-sized hydro-generators[D].Beijing:Tsinghua University,2003.
[3] 贾文超.发电机定子单相接地保护及故障定位的研究[D].北京:华北电力大学,2017.JIA Wenchao.Research on protection and fault location of generator stator single-phase earth fault[D].Beijing:North China Electric Power University,2017.
[4] 毕大强,王祥珩,李德佳,等.发电机定子绕组单相接地故障的定位方法[J].电力系统自动化,2004,28(22):55-57,94.BI Daqiang,WANG Xiangheng,LI Dejia,et al.Location detection for the stator single-phase ground fault of a generator[J].Automa-tion of Electric Power Systems,2004,28(22):55-57,94.
[5] 陈俊,刘梓洪,王明溪,等.不依赖注入式原理的定子单相接地故障定位方法[J].电力系统自动化,2013,37(4):104-107.CHEN Jun,LIU Zihong,WANG Mingxi,et al.Location method for stator single-phase ground fault independent of injection type principle[J].Automation of Electric Power Systems,2013,37(4):104-107.
[6] 贾文超,黄少锋.水轮发电机定子单相接地故障定位新方法[J].电力自动化设备,2017,37(2):134-139.JIA Wenchao,HUANG Shaofeng.Stator single-phase grounding fault location for hydro-generator[J].Electric Power Automation Equipment,2017,37(2):134-139.
[7] 黄少锋,贾文超.大型汽轮发电机定子单相接地故障定位新方法[J].电力系统保护与控制,2017,45(9):35-40.HUANG Shaofeng,JIA Wenchao.A new fault location method for stator single-phase ground fault in large turbine generator[J].Power System Protection and Control,2017,45(9):35-40.
[8] 党晓强,刘俊勇,杨可,等.水轮发电机定子单相接地故障行波定位[J].电力系统自动化,2006,30(23):74-78.DANG Xiaoqiang,LIU Junyong,YANG Ke,et al.Location for stator single phase to ground of hydro-generators based on fault traveling waves[J].Automation of Electric Power Systems,2006,30(23):74-78.
[9] 桂林,铎良,杨忠国,等.反思低转速大型水轮发电机定子绕组形式的选择[J].大电机技术,2013(4):30-33,37.GUN Lin,DUO Liang,YANG Zhongguo,et al.Reconsideration of the selection of stator winding type for large-sized hydraulic generator with low rotational speed[J].Large Electric Machine and Hydraulic Turbine,2013(4):30-33,37.
[10] 桂林,王祥珩,孙宇光,等.巨型水轮发电机定子绕组设计建议——由发电机主保护定量化设计引出的反思[J].电力系统自动化,2009,33(4):45-48,81.GUN Lin,WANG Xiangheng,SUN Yuguang,et al.Suggestions on stator winding design of large hydraulic generator-reconsideration on quantitative design method of main protection for generator[J].Automation of Electric Power Systems,2009,33(4):45-48,81.
[11] 张琦雪,席康庆,陈佳胜,等.大型发电机注入式定子接地保护的现场应用及分析[J].电力系统自动化,2007,31(11):103-107.ZHANG Qixue,XI Kangqing,Chen Jiansheng,et al.Field application and analysis of the stator earth fault protection with voltage injection for large-sized generator[J].Automation of Electric Power Systems,2007,31(11):103-107.
[12] 陈佳胜,张琦雪,郭自刚,等.核电机组注入式定子接地保护若干问题探讨[J].电力自动化设备,2016,36(10):172-175.CHEN Jiasheng,ZHANG Qixue,GUO Zigang,et al.Discussion on injection-type stator grounding protection of nuclear power generator[J].Electric Power Automation Equipment,2016,36(10):172-175.
[13] 李汝良,李义翔,王祥珩.大型发电机定子中性点接地暂态研究[J].电力自动化设备,1999,19(4):3-7.LI Ruliang,LI Yixiang,WANG Xiangheng.The transient state research of generator stator neutral grounding schemes[J].Electric Power Automation Equipment,1999,19(4):3-7.
[14] 王育学,尹项根,张哲,等.基于接地电流的大型发电机定子接地保护及其精确定位方法[J].中国电机工程学报,2013,33(31):147-154.WANG Yuxue,YIN Xianggen,ZHANG Zhe,et al.A novel protection and precise location method based on grounding currents for stator ground faults of large generators[J].Proceedings of the CSEE,2013,33(31):147-154.
[15] WANG Y,YIN X,ZHANG Z.The fault-current-based protection scheme and location algorithm for stator ground fault of a large gene-rator[J].IEEE Transactions on Energy Conversion,2013,28(4):871-879.
[16] 贾文超,黄少锋.基于零序电压故障分量相位特征的发电机定子单相接地故障选相[J].电力自动化设备,2016,36(5):116-121.JIA Wenchao,HUANG Shaofeng.Phase selection based on zero sequence voltage fault component phase characteristics for generator stator single-phase ground fault[J].Electric Power Automation Equipment,2016,36(5):116-121.
[17] 桑建斌,包明磊,李玉平,等.大型汽轮发电机3次谐波电压定子接地保护方案的研究与改进[J].电力自动化设备,2017,37(10):177-183.SANG Jianbin,BAO Minglei,LI Yuping,et al.Research and im-provement of stator grounding protection based on third-harmonic voltage for large-scale turbine generator[J].Electric Power Automation Equipment,2017,37(10):177-183.
[2] 毕大强.大型水轮发电机定子绕组单相接地故障及保护方案的研究[D].北京:清华大学,2003.BI Daqiang.Studies on stator ground fault and its protection for large-sized hydro-generators[D].Beijing:Tsinghua University,2003.
[3] 贾文超.发电机定子单相接地保护及故障定位的研究[D].北京:华北电力大学,2017.JIA Wenchao.Research on protection and fault location of generator stator single-phase earth fault[D].Beijing:North China Electric Power University,2017.
[4] 毕大强,王祥珩,李德佳,等.发电机定子绕组单相接地故障的定位方法[J].电力系统自动化,2004,28(22):55-57,94.BI Daqiang,WANG Xiangheng,LI Dejia,et al.Location detection for the stator single-phase ground fault of a generator[J].Automa-tion of Electric Power Systems,2004,28(22):55-57,94.
[5] 陈俊,刘梓洪,王明溪,等.不依赖注入式原理的定子单相接地故障定位方法[J].电力系统自动化,2013,37(4):104-107.CHEN Jun,LIU Zihong,WANG Mingxi,et al.Location method for stator single-phase ground fault independent of injection type principle[J].Automation of Electric Power Systems,2013,37(4):104-107.
[6] 贾文超,黄少锋.水轮发电机定子单相接地故障定位新方法[J].电力自动化设备,2017,37(2):134-139.JIA Wenchao,HUANG Shaofeng.Stator single-phase grounding fault location for hydro-generator[J].Electric Power Automation Equipment,2017,37(2):134-139.
[7] 黄少锋,贾文超.大型汽轮发电机定子单相接地故障定位新方法[J].电力系统保护与控制,2017,45(9):35-40.HUANG Shaofeng,JIA Wenchao.A new fault location method for stator single-phase ground fault in large turbine generator[J].Power System Protection and Control,2017,45(9):35-40.
[8] 党晓强,刘俊勇,杨可,等.水轮发电机定子单相接地故障行波定位[J].电力系统自动化,2006,30(23):74-78.DANG Xiaoqiang,LIU Junyong,YANG Ke,et al.Location for stator single phase to ground of hydro-generators based on fault traveling waves[J].Automation of Electric Power Systems,2006,30(23):74-78.
[9] 桂林,铎良,杨忠国,等.反思低转速大型水轮发电机定子绕组形式的选择[J].大电机技术,2013(4):30-33,37.GUN Lin,DUO Liang,YANG Zhongguo,et al.Reconsideration of the selection of stator winding type for large-sized hydraulic generator with low rotational speed[J].Large Electric Machine and Hydraulic Turbine,2013(4):30-33,37.
[10] 桂林,王祥珩,孙宇光,等.巨型水轮发电机定子绕组设计建议——由发电机主保护定量化设计引出的反思[J].电力系统自动化,2009,33(4):45-48,81.GUN Lin,WANG Xiangheng,SUN Yuguang,et al.Suggestions on stator winding design of large hydraulic generator-reconsideration on quantitative design method of main protection for generator[J].Automation of Electric Power Systems,2009,33(4):45-48,81.
[11] 张琦雪,席康庆,陈佳胜,等.大型发电机注入式定子接地保护的现场应用及分析[J].电力系统自动化,2007,31(11):103-107.ZHANG Qixue,XI Kangqing,Chen Jiansheng,et al.Field application and analysis of the stator earth fault protection with voltage injection for large-sized generator[J].Automation of Electric Power Systems,2007,31(11):103-107.
[12] 陈佳胜,张琦雪,郭自刚,等.核电机组注入式定子接地保护若干问题探讨[J].电力自动化设备,2016,36(10):172-175.CHEN Jiasheng,ZHANG Qixue,GUO Zigang,et al.Discussion on injection-type stator grounding protection of nuclear power generator[J].Electric Power Automation Equipment,2016,36(10):172-175.
[13] 李汝良,李义翔,王祥珩.大型发电机定子中性点接地暂态研究[J].电力自动化设备,1999,19(4):3-7.LI Ruliang,LI Yixiang,WANG Xiangheng.The transient state research of generator stator neutral grounding schemes[J].Electric Power Automation Equipment,1999,19(4):3-7.
[14] 王育学,尹项根,张哲,等.基于接地电流的大型发电机定子接地保护及其精确定位方法[J].中国电机工程学报,2013,33(31):147-154.WANG Yuxue,YIN Xianggen,ZHANG Zhe,et al.A novel protection and precise location method based on grounding currents for stator ground faults of large generators[J].Proceedings of the CSEE,2013,33(31):147-154.
[15] WANG Y,YIN X,ZHANG Z.The fault-current-based protection scheme and location algorithm for stator ground fault of a large gene-rator[J].IEEE Transactions on Energy Conversion,2013,28(4):871-879.
[16] 贾文超,黄少锋.基于零序电压故障分量相位特征的发电机定子单相接地故障选相[J].电力自动化设备,2016,36(5):116-121.JIA Wenchao,HUANG Shaofeng.Phase selection based on zero sequence voltage fault component phase characteristics for generator stator single-phase ground fault[J].Electric Power Automation Equipment,2016,36(5):116-121.
[17] 桑建斌,包明磊,李玉平,等.大型汽轮发电机3次谐波电压定子接地保护方案的研究与改进[J].电力自动化设备,2017,37(10):177-183.SANG Jianbin,BAO Minglei,LI Yuping,et al.Research and im-provement of stator grounding protection based on third-harmonic voltage for large-scale turbine generator[J].Electric Power Automation Equipment,2017,37(10):177-183.
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