适用于同塔混压线路跨电压故障的距离保护新方法
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摘要
跨线故障是同塔多回输电线路的典型故障类型。同塔混压多回线路的跨线阻抗计算需考虑不同电压等级线路阻抗参数的差异性。本文提出了适用于同塔混压双回线路和典型同塔混压四回线路的跨电压等级的跨线阻抗计算方法。此方法将阻抗参数不同的两回线路的跨线阻抗用其中一回线的正序阻抗表示,同时考虑了线间零序互感的影响,并据此提出了基于跨电压等级跨线阻抗的距离保护I段的应用新方法。EMTP仿真表明,采用所提出方法计算的跨线阻抗可以正确反映故障点到保护安装处的距离。
Cross-line fault is a typical type of fault for multi-circuit transmission lines on the same tower. The calculation of cross-line impedance of multi-voltage multi-circuit lines on the same tower needs to take the differences between impedance parameters of lines at different voltage levels into account. In this paper,a calculation method for cross-voltage cross-line impedance,which is suitable for multi-voltage double-circuit lines and typical multi-voltage four-circuit lines on the same tower,is proposed. This method uses the positive-sequence impedance of one circuit to represent the cross-line impedance of two circuits with different impedance parameters;meanwhile,it considers the influence of zerosequence mutual inductance between lines. On this basis,a novel application method for the first-zone distance protection is proposed based on cross-voltage cross-line impedance. Simulation results with EMTP show that the cross-line impedance calculated by the proposed method can reflect the distance from the fault location to the installation position of protection.
Cross-line fault is a typical type of fault for multi-circuit transmission lines on the same tower. The calculation of cross-line impedance of multi-voltage multi-circuit lines on the same tower needs to take the differences between impedance parameters of lines at different voltage levels into account. In this paper,a calculation method for cross-voltage cross-line impedance,which is suitable for multi-voltage double-circuit lines and typical multi-voltage four-circuit lines on the same tower,is proposed. This method uses the positive-sequence impedance of one circuit to represent the cross-line impedance of two circuits with different impedance parameters;meanwhile,it considers the influence of zerosequence mutual inductance between lines. On this basis,a novel application method for the first-zone distance protection is proposed based on cross-voltage cross-line impedance. Simulation results with EMTP show that the cross-line impedance calculated by the proposed method can reflect the distance from the fault location to the installation position of protection.
引文
[1]贺家李,李永丽,李斌,等.特高压交直流输电保护与控制技术[M].北京:中国电力出版社,2014.
[2]毕天姝,李伟,徐振宇,等(Bi Tianshu,Li Wei,Xu Zhenyu,et al).基于单端单回线电气量的同杆双回线单相接地距离保护(Single-phase grounding distance protection of parallel transmission lines on same poles based on electric quantities data from single terminal and single line)[J].电力系统自动化(Automation of Electric Power Systems),2013,37(7):88-93.
[3]周春霞,余越,赵寒,等(Zhou Chunxia,Yu Yue,Zhao Han,et al).特高压同塔双回线路零序电流补偿系数整定对接地距离保护的影响研究(Influence of zero-sequence current compensation coefficient setting on earthfault distance protection for double circuit UHVAC transmission lines on the same tower)[J].电网技术(Power System Technology),2012,36(12):106-111.
[4]姜宪国,刘宇,周泽昕,等(Jiang Xianguo,Liu Yu,Zhou Zexin,et al).同塔双回线接地距离保护零序电流补偿系数分析及整定方法改进(Analysis of zero-sequence current compensation coefficient and improvement of setting method for grounding distance protection of dual-loop lines on same tower)[J].电力自动化设备(Electric Power Automation Equipment),2015,35(8):9-14,30.
[5]张颖,邰能灵(Zhang Ying,Tai Nengling).同塔四回线接地距离保护的分析(Analysis of ground distance protection for quadruple-circuit transmission lines on the same tower)[J].电力系统保护与控制(Power System Protection and Control),2010,38(12):1-6.
[6]赵凯超,周泽昕,杜丁香(Zhao Kaichao,Zhou Zexin,Du Dingxiang).不同电压等级同塔四回输电线路不同运行方式下零序互感对接地距离保护的影响(Influence of zero-sequence mutual inductance on earth-fault distance protection for four-circuit transmission lines belonging to different voltage classes on same tower under different operation modes)[J].电网技术(Power System Technology),2010,34(12):193-197.
[7]马晓明,范春菊,刘玲(Ma Xiaoming,Fan Chunju,Liu Ling).跨电压等级同杆四回线接地距离保护的研究(Ground distance protection for four joint transmission lines with different voltage grades on the same tower)[J].电力系统保护与控制(Power System Protection and Control),2011,39(24):28-34.
[8] Li Bin,Guo Fengrui,Li Xuebin,et al. Circulating unbalanced currents of EHV/UHV untransposed double-circuit lines and their influence on pilot protection[J]. IEEE Trans on Power Delivery,2014,29(2):825-833.
[9]李斌,廖惠琴,戴冬康,等(Li Bin,Liao Huiqin,Dai Dongkang,et al).局部同塔输电线路的接地距离保护影响及对策(Effect on ground distance protection and measures for transmission lines partially on the same tower)[J].电力系统及其自动化学报(Proceedings of the CSU-EPSA),2017,29(12):1-7,13.
[10]陈桥平,蔡泽祥,刘为雄,等(Chen Qiaoping,Cai Zexiang,Liu Weixiong,et al).同杆线路跨线故障及其对距离保护的影响分析(Analysis on parallel lines inter-line fault and its influence on distance protection)[J].电力系统自动化(Automation of Electric Power Systems),2010,34(5):72-76,90.
[11] Bi Tianshu,Li Wei,Xu Zhenyu,et al. First-zone distance relaying algorithm of parallel transmission lines for crosscountry grounded faults[J]. IEEE Trans on Power Delivery,2012,27(4):2185-2192.
[12]黄少锋,刘欣,王洪敏,等(Huang Shaofeng,Liu Xin,Wang Hongmin,et al).混压同塔四回线跨电压故障的短路计算(Cross-voltage short-circuit calculation on mixed-voltage four-circuit lines system)[J].中国电机工程学报(Proceedings of the CSEE),2016,36(4):993-1001.
[13]黄少锋,刘欣,张鹏,等(Huang Shaofeng,Liu Xin,Zhang Peng,et al).混压同塔线路跨电压接地故障对距离保护的影响分析(Influence on distance protection caused by earthed cross-voltage fault in multi-circuit transmission lines system)[J].电力系统自动化(Automation of Electric Power Systems),2016,40(1):96-101.
[14]朱晓彤,郑玉平,张俊洪,等(Zhu Xiaotong,Zheng Yuping,Zhang Junhong,et al).同杆并架双回线跨线不接地故障的距离保护(Distance protection of double-circuit line on the same pole when phase to phase fault occurs)[J].电力系统自动化(Automation of Electric Power Systems),2003,27(19):61-64,68.
[15]朱声石(Zhu Shengshi).超高压同杆并架双回线路的距离保护(Distance protection of UHV double circuit lines on the same tower)[J].电力系统自动化(Automation of Electric Power Systems),1980,4(4):1-10.
[16]李博通,李永丽,陈莉,等(Li Botong,Li Yongli,Chen Li,et al).同塔四回线参数解耦及故障分析方法(Method for parameter decoupling and fault analysis of four-circuit transmission lines on the same tower)[J].电力系统保护与控制(Power System Protection and Control),2010,38(19):1-9.
[17]朱声石.高压电网继电保护原理与技术[M].北京:中国电力出版社,2014.
[18] DL/T 5092-1999,110-500 kV架空送电线路设计技术规程[S].
[2]毕天姝,李伟,徐振宇,等(Bi Tianshu,Li Wei,Xu Zhenyu,et al).基于单端单回线电气量的同杆双回线单相接地距离保护(Single-phase grounding distance protection of parallel transmission lines on same poles based on electric quantities data from single terminal and single line)[J].电力系统自动化(Automation of Electric Power Systems),2013,37(7):88-93.
[3]周春霞,余越,赵寒,等(Zhou Chunxia,Yu Yue,Zhao Han,et al).特高压同塔双回线路零序电流补偿系数整定对接地距离保护的影响研究(Influence of zero-sequence current compensation coefficient setting on earthfault distance protection for double circuit UHVAC transmission lines on the same tower)[J].电网技术(Power System Technology),2012,36(12):106-111.
[4]姜宪国,刘宇,周泽昕,等(Jiang Xianguo,Liu Yu,Zhou Zexin,et al).同塔双回线接地距离保护零序电流补偿系数分析及整定方法改进(Analysis of zero-sequence current compensation coefficient and improvement of setting method for grounding distance protection of dual-loop lines on same tower)[J].电力自动化设备(Electric Power Automation Equipment),2015,35(8):9-14,30.
[5]张颖,邰能灵(Zhang Ying,Tai Nengling).同塔四回线接地距离保护的分析(Analysis of ground distance protection for quadruple-circuit transmission lines on the same tower)[J].电力系统保护与控制(Power System Protection and Control),2010,38(12):1-6.
[6]赵凯超,周泽昕,杜丁香(Zhao Kaichao,Zhou Zexin,Du Dingxiang).不同电压等级同塔四回输电线路不同运行方式下零序互感对接地距离保护的影响(Influence of zero-sequence mutual inductance on earth-fault distance protection for four-circuit transmission lines belonging to different voltage classes on same tower under different operation modes)[J].电网技术(Power System Technology),2010,34(12):193-197.
[7]马晓明,范春菊,刘玲(Ma Xiaoming,Fan Chunju,Liu Ling).跨电压等级同杆四回线接地距离保护的研究(Ground distance protection for four joint transmission lines with different voltage grades on the same tower)[J].电力系统保护与控制(Power System Protection and Control),2011,39(24):28-34.
[8] Li Bin,Guo Fengrui,Li Xuebin,et al. Circulating unbalanced currents of EHV/UHV untransposed double-circuit lines and their influence on pilot protection[J]. IEEE Trans on Power Delivery,2014,29(2):825-833.
[9]李斌,廖惠琴,戴冬康,等(Li Bin,Liao Huiqin,Dai Dongkang,et al).局部同塔输电线路的接地距离保护影响及对策(Effect on ground distance protection and measures for transmission lines partially on the same tower)[J].电力系统及其自动化学报(Proceedings of the CSU-EPSA),2017,29(12):1-7,13.
[10]陈桥平,蔡泽祥,刘为雄,等(Chen Qiaoping,Cai Zexiang,Liu Weixiong,et al).同杆线路跨线故障及其对距离保护的影响分析(Analysis on parallel lines inter-line fault and its influence on distance protection)[J].电力系统自动化(Automation of Electric Power Systems),2010,34(5):72-76,90.
[11] Bi Tianshu,Li Wei,Xu Zhenyu,et al. First-zone distance relaying algorithm of parallel transmission lines for crosscountry grounded faults[J]. IEEE Trans on Power Delivery,2012,27(4):2185-2192.
[12]黄少锋,刘欣,王洪敏,等(Huang Shaofeng,Liu Xin,Wang Hongmin,et al).混压同塔四回线跨电压故障的短路计算(Cross-voltage short-circuit calculation on mixed-voltage four-circuit lines system)[J].中国电机工程学报(Proceedings of the CSEE),2016,36(4):993-1001.
[13]黄少锋,刘欣,张鹏,等(Huang Shaofeng,Liu Xin,Zhang Peng,et al).混压同塔线路跨电压接地故障对距离保护的影响分析(Influence on distance protection caused by earthed cross-voltage fault in multi-circuit transmission lines system)[J].电力系统自动化(Automation of Electric Power Systems),2016,40(1):96-101.
[14]朱晓彤,郑玉平,张俊洪,等(Zhu Xiaotong,Zheng Yuping,Zhang Junhong,et al).同杆并架双回线跨线不接地故障的距离保护(Distance protection of double-circuit line on the same pole when phase to phase fault occurs)[J].电力系统自动化(Automation of Electric Power Systems),2003,27(19):61-64,68.
[15]朱声石(Zhu Shengshi).超高压同杆并架双回线路的距离保护(Distance protection of UHV double circuit lines on the same tower)[J].电力系统自动化(Automation of Electric Power Systems),1980,4(4):1-10.
[16]李博通,李永丽,陈莉,等(Li Botong,Li Yongli,Chen Li,et al).同塔四回线参数解耦及故障分析方法(Method for parameter decoupling and fault analysis of four-circuit transmission lines on the same tower)[J].电力系统保护与控制(Power System Protection and Control),2010,38(19):1-9.
[17]朱声石.高压电网继电保护原理与技术[M].北京:中国电力出版社,2014.
[18] DL/T 5092-1999,110-500 kV架空送电线路设计技术规程[S].