用于绝缘子污秽度预测的泄漏电流分形特征
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摘要
污秽放电的极端结果是污闪,为提取反映绝缘子污秽放电发展的有效特征量,在实验室反复试验的基础上,利用分形理论提取绝缘子污秽放电过程中泄漏电流波形的分形维数和多重分形特征量,分析了4种不同污秽度下泄漏电流分形维数和多重分形谱的变化特性。结果表明污秽放电过程中分形维数的变化特征明显,分形维数的大小随污秽的加重呈整体下降的趋势;多重分形谱的谱宽Δa随污秽度的增大而增大。试验验证了泄漏电流的分形特征能有效预测绝缘子污秽的轻重,为污闪预警提供了新方法和新特征量。
The extreme result of insulators contamination discharge is contamination flashover,in order to obtain effective characteristics of contamination discharge,we used the fractal theory to extract fractal dimension and multi-fractal characteristics of leakage current waveform by performing a number of experiments in the laboratory,and analyzed the change features of fractal dimension and multi-fractal spectrum of leakage current under four kinds of contamination degrees.It is found that variation characteristics of fractal dimension during contamination discharge are obvious,besides,fractal dimension values decrease integrally and spectrum width of multi-fractal spectrum increases as contamination degrees increase.The results show that fractal characteristics of leakage current can estimate insulator contamination degrees effectively.It is proved that the new methods can effectively predict the characteristic volume to contamination flashover.
The extreme result of insulators contamination discharge is contamination flashover,in order to obtain effective characteristics of contamination discharge,we used the fractal theory to extract fractal dimension and multi-fractal characteristics of leakage current waveform by performing a number of experiments in the laboratory,and analyzed the change features of fractal dimension and multi-fractal spectrum of leakage current under four kinds of contamination degrees.It is found that variation characteristics of fractal dimension during contamination discharge are obvious,besides,fractal dimension values decrease integrally and spectrum width of multi-fractal spectrum increases as contamination degrees increase.The results show that fractal characteristics of leakage current can estimate insulator contamination degrees effectively.It is proved that the new methods can effectively predict the characteristic volume to contamination flashover.
引文
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[15]中华人民国家标准化管理委员会.GB/T 4585—2004/IEC60507交流系统用高压绝缘子的人工污秽试验[S].北京:中国标准出版社,1991.Standardization Administration of China.GB/T 4585-2004/IEC60507 Artificial pollution tests on high-voltage to be usedon a.c.systems[S].Beijing,China:Standards Press of China,1991.
[16]Chen Weigen,Yao Chenguo,Sun Caixin,et al.A new broad-band micro-current transducer for insulator leakage currentmonitoring system[J].IEEE Transactions on Power Delivery,2008,23(1):355-361.
[2]An Ling,Jiang Xiuchen,Han Zhendong.Measurements of e-quivalent salt deposit density(ESDD)on a suspension insulator[J].IEEE Transactions on Dielectrics and Electrical Insulation,2002,9(4):562-568.
[3]石岩,蒋兴良,黄欢.污秽瓷绝缘子泄漏电流的估算方法[J].高电压技术,2009,35(6):1350-1355.SHI Yan,JIANG Xing-liang,HUANG Huan.Method of evalu-ating leakage current of contaminated porcelain insulators[J].High Voltage Engineering,2009,35(6):1350-1355.
[4]李?延,姚陈果,胡建林,等.染污绝缘子放电发展区段与污闪预警的实验研究[J].中国电机工程学报,2008,28(13):8-14.LI Jing-yan,YAO Chen-guo,HU Jian-lin,et al.Experimentalresearch on discharge development zones of contamination insu-lators and contamination flashover pre-warning[J].Proceedingsof the CSEE,2008,28(13):8-14.
[5]Suda T.Frequency characteristics of leakage current waveformsof an artificially polluted suspension insulator[J].IEEE Trans-actions on Dielectrics and Electrical Insulation,2001,8(4):705-710.
[6]陈伟根,夏青,李?延,等.绝缘子污秽预测新特征量的泄漏电流时频特性分析[J].高电压技术,2010,36(5):1107-1112.CHEN Wei-gen,XIA Qing,LI Jing-yan,et al.Time-frequencycharacteristic analysis of leakage current for new characteristicsof insulators contamination prediction[J].High Voltage Engi-neering,2010,36(5):1107-1112.
[7]Suda T,MEMBER S.Frequency characteristics of leakage cur-rent waveforms of a string of suspension insulators[J].IEEETransactions on Power Delivery,2005,20(1):481-488.
[8]毛颖科,关志成,王黎明,等.基于BP人工神经网络的绝缘子泄漏电流预测[J].中国电机工程学报,2007,27(27):7-12.MAO Ying-ke,GUAN Zhi-cheng,WANG Li-ming,et al.Predic-tion of leakage current of outdoor insulators based on BP artifi-cial neural network[J].Proceedings of the CSEE,2007,27(27):7-12.
[9]惠阿丽,林辉.高压绝缘子泄漏电流的分形特征[J].高电压技术,2008,34(6):1271-1276.HUI A-li,LIN Hui.Fractal characteristics of leakage current onHV insulators[J].High Voltage Engineering,2008,34(6):1271-1276.
[10]赵健,雷蕾,蒲小勤.分形理论及其在信号处理中的应用[M].北京:清华大学出版社,2008.ZHAO Jian,LEI Lei,PU Xiao-qin.Fractal theory and its ap-ply in signal processing[M].Beijing,China:Tsinghua Univer-sity Press,2008.
[11]孙才新,许高峰,唐炬,等.以盒维数和信息维数为识别特征量的GIS局部放电模式识别方法[J].中国电机工程学报,2005,25(3):100-103.SUN Cai-xin,XU Gao-feng,TANG Ju,et al.PD pattern recog-nition method using box dimension and information dimensionas discriminating features in GIS[J].Proceedings of the CSEE,2005,25(3):100-103.
[12]汪刘应,王汉功,华绍春,等.用分形理论研究超音速电弧喷涂PS45涂层结合强度与喷涂电压的关系[J].稀有金属材料与工程,2006,35(2):291-294.WANG Liu-ying,WANG Han-gong,HUA Shao-chun,et al.Study of the bond strength of PS45 alloy coatings prepared byhigh velocity arc spray and processing parameters on fractaltheory[J].Rare Metal Materials and Engineering,2006,35(2):291-294.
[13]解文荣,张莉.地震波形的分形判别与特征提取[J].华北地震科学,2004,22(4):22-24.XIE Wen-rong,ZHANG Li.The fractal identification of seis-mic wave and the extraction for its characteristics[J].NorthChina Earthquake Sciences,2004,22(4):22-24.
[14]孙霞,吴自勤,黄畇.分形原理及其应用[M].合肥:中国科学技术大学出版社,2003.SUN Xia,WU Zi-qin,HUANG Yun.Fractal principle and ap-ply[M].Hefei,China:University of Science and Technologyof China Press,2003.
[15]中华人民国家标准化管理委员会.GB/T 4585—2004/IEC60507交流系统用高压绝缘子的人工污秽试验[S].北京:中国标准出版社,1991.Standardization Administration of China.GB/T 4585-2004/IEC60507 Artificial pollution tests on high-voltage to be usedon a.c.systems[S].Beijing,China:Standards Press of China,1991.
[16]Chen Weigen,Yao Chenguo,Sun Caixin,et al.A new broad-band micro-current transducer for insulator leakage currentmonitoring system[J].IEEE Transactions on Power Delivery,2008,23(1):355-361.
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