含同杆双回线的输电网零序反时限过流保护加速配合方案
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摘要
分析了同杆双回线内部发生接地故障时故障线路及相邻线路上零序反时限过流保护的动作特性。分析结果表明当故障位置与两侧系统参数满足特定条件时,双回线相邻线路上的零序反时限保护可能误动,故障线路两端保护的灵敏度配合可能存在问题。提出一种改变相邻线路保护时间整定系数的方法来避免可能出现的保护误动,该方法通过增加相邻线路保护动作延时来保证双回线保护优先动作,但也给相邻线路保护的速动性带来不利影响。此外故障线路两端保护的动作时间可能相差较大,不利于故障的快速切除。为此设计了基于零序电流变化和零序功率方向的加速方案,无论双回线故障还是双回线相邻线路故障,均能确保故障线路保护优先动作,从而保证各处保护的选择性和速动性。算例仿真验证了分析结论的正确性和所提加速方案的可行性。
The operating characteristics of zero-sequence inverse-time overcurrent protections of the faulty and adjacent lines during the internal grounding fault of double-circuit lines on same tower are analyzed and results show that,when the fault location and the system parameters of both sides meet some conditions,the zero-sequence inverse-time overcurrent protections of the adjacent lines may malfunction and the protection sensitivities of two ends of the faulty line may mismatch. It is proposed to change the protection TDS(Time Dial Setting) of adjacent line to avoid the possible malfunction,which ensures the protections of doublecircuit lines function first by increasing the time-delay of the protections of adjacent lines,but also reduces their sensitivity. Besides,the protections at both sides of faulty line may have quite different operating times,unfavourable for the rapid fault removal. Therefore,acceleration schemes respectively based on zero-sequence power direction and zero-sequence current variation are put forward,which ensures the protections of faulty line function first,either double-circuit lines or adjacent lines. The selectivity and sensitivity of all the protections are ensured. Simulative results prove the validity of the analytical results and the feasibility of the proposed acceleration scheme.
The operating characteristics of zero-sequence inverse-time overcurrent protections of the faulty and adjacent lines during the internal grounding fault of double-circuit lines on same tower are analyzed and results show that,when the fault location and the system parameters of both sides meet some conditions,the zero-sequence inverse-time overcurrent protections of the adjacent lines may malfunction and the protection sensitivities of two ends of the faulty line may mismatch. It is proposed to change the protection TDS(Time Dial Setting) of adjacent line to avoid the possible malfunction,which ensures the protections of doublecircuit lines function first by increasing the time-delay of the protections of adjacent lines,but also reduces their sensitivity. Besides,the protections at both sides of faulty line may have quite different operating times,unfavourable for the rapid fault removal. Therefore,acceleration schemes respectively based on zero-sequence power direction and zero-sequence current variation are put forward,which ensures the protections of faulty line function first,either double-circuit lines or adjacent lines. The selectivity and sensitivity of all the protections are ensured. Simulative results prove the validity of the analytical results and the feasibility of the proposed acceleration scheme.
引文
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[2]郭煜华,姜军,范春菊,等.改进的配电网反时限过电流保护[J]电力自动化设备,2015,35(10):45-50.GUO Yuhua,JIANG Jun,FAN Chunju,et al.Improved inverse time over-current for distribution network[J].Electric Power Auto mation Equipment,2015,35(10):45-50.
[3]张旭俊,上官帖,唐建洪,等.采用零序功率绝对值构成反时限零序电流保护的方案探讨[J].电力系统保护与控制,2009,37(23):41-44.ZHANG Xujun,SHANGGUAN Tie,TANG Jianhong,et al.Research on inverse time current relay based on absolute value of zerosequence power[J].Power System Protection and Control,2009,37(23):41-44.
[4]林军.超高压同杆双回线多重故障的计算[J].中国电机工程学报,2010,30(13):89-93.LIN Jun.Multi-fault calculation of EHV double circuits transmission lines[J].Proceedings of the CSEE,2010,30(13):89-93.
[5]曾耿晖,蔡泽祥,陈桥平,等.同塔双回线路接地故障零序电流分布特性分析[J].电网技术,2011,35(11):212-217.ZENG Genghui,CAI Zexiang,CHEN Qiaoping,et al.Analysis on zero sequence current distribution characteristic of grounding faults occurred in double-circuit transmission lines on the same tower[J].Power System Technology,2011,35(11):212-217.
[6]臧睿,廖晓玉,张予鄂.对输电线反时限零序电流保护选择性的分析[J].继电器,2006,34(22):12-13.ZANG Rui,LIAO Xiaoyu,ZHANG Yu’e.Analysis of inverse time zero sequence current relay and its selectivity[J].Relay,2006,34(22):12-13.
[7]吴麟琳,黄少锋.平行双回线对反时限零序电流保护选择性的分析[J].电网技术,2013,37(3):708-712.WU Linlin,HUANG Shaofeng.Influence of parallel doublecircuit transmission lines on inverse-time zero-sequence current protection and its improved algorithm[J].Power System Technology,2013,37(3):708-712.
[8]李欧.引入变速因子的反时限零序电流保护[D].北京:华北电力大学,2015.LI Ou.Research of inverse time zero sequence current protection with introduction of speed-changing factor[D].Beijing:North China Electric Power University,2015.
[9]邹东霞,梁海宁,苏毅,等.通用反时限特性在微机保护中的实现方法[J].电力系统自动化,2007,31(5):80-83.ZOU Dongxia,LIANG Haining,SU Yi,et al.Realization of the universal inverse time lag characteristic in microprocessor based protection[J].Automation of Electric Power Systems,2007,31(5):80-83.
[10]徐厚东.微机反时限过流保护算法[J].清华大学学报(自然科学版),2006,46(1):1-4.XU Houdong.Microprocessor-based inverse time over-current protection algorithm[J].Journal of Tsinghua University(Science and Technology),2006,46(1):1-4.
[11]董新洲,李幼仪,薄志谦.双回线无通道保护(一)故障分析和保护原理[J].电力系统自动化,2004,28(11):53-56.DONG Xinzhou,LI Youyi,BO Zhiqian.Non-communication protection of double-circuit line systems part one fault analysis and protection principle[J].Automation of Electric Power Systems,2004,28(11):53-56.
[12]李幼仪,董新洲,孙元章,等.双回线无通道保护研究(二)仿真试验[J].电力系统自动化,2004,28(12):56-59.LI Youyi,DONG Xinzhou,SUN Yuanzhang,et al.Non-communication protection of double-circuit line systems part two simulation[J].Automation of Electric Power Systems,2004,28(12):56-59.