基于暂态相电流特征分析的故障选线新方法
|
摘要
为解决小电流接地系统单相接地故障时选线效果不佳的问题,详细分析了故障线路与非故障线路各相电流突变量及故障相电流频率分布特征。可知故障线路故障相与非故障相突变量波形差别较大,故障相暂态信号集中的频段较低;而非故障线路各相突变量幅值相同,波形一致,故障相暂态信号集中频段较高。为此,提出了综合利用相电流突变量及重心频率双重判据的故障选线方法,并借助故障特征距离将二者有效地结合起来,两种判据相互补充,进一步提高了选线的裕度。大量仿真分析表明,该方法在经高阻接地、故障初始角较小时均有较好的效果,具有适用性好、选线可靠、抗干扰能力强的特点。
In order to solve the problem of poor effect of fault line selection when a single-phase grounding fault occursin the neutral indirect ground system,the distribution characteristics of fault component of current in every phase on thefault lines and non-fault lines and the phase-current frequency are analyzed in detail. It is shown that the difference be-tween waveforms of fault components in fault phase and non-fault phase on the fault line are obvious,and the frequencyband where transient signals gather is lower for fault phase. However,the amplitudes of fault components in every phaseon the non-fault line are the same,their waveforms agree with each other,and the frequency band where transient sig-nals gather is higher for fault phase. Therefore,a method of fault line selection is proposed in this paper,which usesfault components of phase-current and the frequency of gravity center as two criterions. With fault characteristic dis-tance,these two criterions can complement with each other,which can further improve the margin. Simulation resultsshow that the method has better effects when a high-resistance grounding fault occurs in the context of small initial an-gle. Moreover,it has good applicability,reliable selection and strong anti-interference ability.
In order to solve the problem of poor effect of fault line selection when a single-phase grounding fault occursin the neutral indirect ground system,the distribution characteristics of fault component of current in every phase on thefault lines and non-fault lines and the phase-current frequency are analyzed in detail. It is shown that the difference be-tween waveforms of fault components in fault phase and non-fault phase on the fault line are obvious,and the frequencyband where transient signals gather is lower for fault phase. However,the amplitudes of fault components in every phaseon the non-fault line are the same,their waveforms agree with each other,and the frequency band where transient sig-nals gather is higher for fault phase. Therefore,a method of fault line selection is proposed in this paper,which usesfault components of phase-current and the frequency of gravity center as two criterions. With fault characteristic dis-tance,these two criterions can complement with each other,which can further improve the margin. Simulation resultsshow that the method has better effects when a high-resistance grounding fault occurs in the context of small initial an-gle. Moreover,it has good applicability,reliable selection and strong anti-interference ability.
引文
[1]郭清滔,吴田(Guo Qingtao,Wu Tian).小电流接地系统故障选线方法综述(Survey of the methods to select fault line in neutral point ineffectively grounded power system)[J].电力系统保护与控制(Power System Protection and Control),2010,38(2):146-152.
[2]曾祥君,尹项根,张哲,等(Zeng Xiangjun,Yin Xianggen,Zhang Zhe,et al).零序导纳法馈线接地保护的研究(Study on feeder grounding fault protection based on zero sequence admittance)[J].中国电机工程学报(Proceedings of the CSEE),2001,21(4):5-10.
[3]牟龙华(Mu Longhua).零序电流有功分量方向接地选线保护原理(Principle of selective grounding fault protection based on active component direction of zero-sequence current)[J].电网技术(Power System Technology),1999,23(9):60-62.
[4]樊淑娴,徐丙垠,张清周(Fan Shuxian,Xu Bingyin,Zhang Qingzhou).注入方波信号的经消弧线圈接地系统故障选线方法(A new method for fault line selection in distribution system with arc suppression coil grounding with square-wave signal injection)[J].电力系统自动化(Automation of Electric Power Systems),2012,36(4):91-95.
[5]高志鹏,张慧芬,孙旭娜(Gao Zhipeng,Zhang Huifen,Sun Xuna).注入半波直流的小电流接地故障选线定位方法(A method of fault line selection and fault point location with half-wave DC injection in distribution network)[J].电力系统保护与控制(Power System Protection and Control),2013,41(13):139-145.
[6]王铭,王宏伟,赵义明(Wang Ming,Wang Hongwei,Zhao Yiming).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(Application research for the root mean square ratio of modulus maximum in the distribution network transient fault line selection)[J].电力系统保护与控制(Power System Protection and Control),2014,42(17):50-54.
[7]彭湃,周羽生,高云龙,等(Peng Pai,Zhou Yusheng,Gao Yunlong,et al).GA优化LVQ网络的配电网接地故障选线方法(Ground fault line selection method in distribution network using GA optimal LVQ network)[J].电力系统及其自动化学报(Proceedings of the CSU-EPSA),2015,27(10):64-69.
[8]薛永端,冯祖仁,徐丙垠(Xue Yongduan,Feng Zuren,Xu Bingyin).基于暂态零序电流比较的小电流接地选线研究(Earth fault protection in non-solidly earthed network based on transient zero sequence current comparison)[J].电力系统自动化(Automation of Electric Power Systems),2003,27(9):48-53.
[9]李也白,唐克义,张霄霄,等(Li Yebai,Tang Keyi,Zhang Xiaoxiao,et al).小波包原理小电流接地选线装置的研发与应用(Research and application of small current grounding line selection device based on wavelet packet principle)[J].电力系统及其自动化学报(Proceedings of the CSU-EPSA),2013,25(2):159-162.
[10]赖平,周想凌,邱丹(Lai Ping,Zhou Xiangling,Qiu Dan).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(Research on transient-current frequency analysis and faulty line detecting method in indirectly grounding power system)[J].电力系统保护与控制(Power System Protection and Control),2015,43(4):51-57.
[11]李森,宋国兵,康小宁,等(Li Sen,Song Guobing,Kang Xiaoning,et al).基于时域下相关分析法的小电流接地故障选线(Time-domain fault line selection based on correlation analysis in neutral indirect ground system)[J].电力系统保护与控制(Power System Protection and Control),2008,36(13):15-20.
[2]曾祥君,尹项根,张哲,等(Zeng Xiangjun,Yin Xianggen,Zhang Zhe,et al).零序导纳法馈线接地保护的研究(Study on feeder grounding fault protection based on zero sequence admittance)[J].中国电机工程学报(Proceedings of the CSEE),2001,21(4):5-10.
[3]牟龙华(Mu Longhua).零序电流有功分量方向接地选线保护原理(Principle of selective grounding fault protection based on active component direction of zero-sequence current)[J].电网技术(Power System Technology),1999,23(9):60-62.
[4]樊淑娴,徐丙垠,张清周(Fan Shuxian,Xu Bingyin,Zhang Qingzhou).注入方波信号的经消弧线圈接地系统故障选线方法(A new method for fault line selection in distribution system with arc suppression coil grounding with square-wave signal injection)[J].电力系统自动化(Automation of Electric Power Systems),2012,36(4):91-95.
[5]高志鹏,张慧芬,孙旭娜(Gao Zhipeng,Zhang Huifen,Sun Xuna).注入半波直流的小电流接地故障选线定位方法(A method of fault line selection and fault point location with half-wave DC injection in distribution network)[J].电力系统保护与控制(Power System Protection and Control),2013,41(13):139-145.
[6]王铭,王宏伟,赵义明(Wang Ming,Wang Hongwei,Zhao Yiming).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(Application research for the root mean square ratio of modulus maximum in the distribution network transient fault line selection)[J].电力系统保护与控制(Power System Protection and Control),2014,42(17):50-54.
[7]彭湃,周羽生,高云龙,等(Peng Pai,Zhou Yusheng,Gao Yunlong,et al).GA优化LVQ网络的配电网接地故障选线方法(Ground fault line selection method in distribution network using GA optimal LVQ network)[J].电力系统及其自动化学报(Proceedings of the CSU-EPSA),2015,27(10):64-69.
[8]薛永端,冯祖仁,徐丙垠(Xue Yongduan,Feng Zuren,Xu Bingyin).基于暂态零序电流比较的小电流接地选线研究(Earth fault protection in non-solidly earthed network based on transient zero sequence current comparison)[J].电力系统自动化(Automation of Electric Power Systems),2003,27(9):48-53.
[9]李也白,唐克义,张霄霄,等(Li Yebai,Tang Keyi,Zhang Xiaoxiao,et al).小波包原理小电流接地选线装置的研发与应用(Research and application of small current grounding line selection device based on wavelet packet principle)[J].电力系统及其自动化学报(Proceedings of the CSU-EPSA),2013,25(2):159-162.
[10]赖平,周想凌,邱丹(Lai Ping,Zhou Xiangling,Qiu Dan).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(Research on transient-current frequency analysis and faulty line detecting method in indirectly grounding power system)[J].电力系统保护与控制(Power System Protection and Control),2015,43(4):51-57.
[11]李森,宋国兵,康小宁,等(Li Sen,Song Guobing,Kang Xiaoning,et al).基于时域下相关分析法的小电流接地故障选线(Time-domain fault line selection based on correlation analysis in neutral indirect ground system)[J].电力系统保护与控制(Power System Protection and Control),2008,36(13):15-20.
© 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 |