电涌保护器中漏电流阻性分量的监测及提取方法
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摘要
电涌保护器漏电流的阻性分量是表征其老化的重要参数,监测阻性分量的变化趋势并提取其基波和三次谐波的峰值,对电涌保护器的老化监测具有重要意义。从等效模型出发,推导出利用漏电流计算电涌保护器相关系数k的表达式,分析验证了k值与阻性分量特别是三次谐波的峰值负相关,可通过k值监测阻性电流的变化。进一步,针对容性电流补偿法提取阻性分量受谐波干扰、移相电流法不适用于阻性分量较小的情况等问题,提出一种改进方法。将漏电流进行过零检测、低通滤波和相位测量,确定基波频率和移相角度,利用各分量的相位关系求解容性电流并提取阻性分量。将该方法应用到仿真和实际数据中,对提取的阻性电流进行快速傅里叶变换(FFT)分析比对,结果表明,阻性电流基波和谐波的提取精度得到改善。
The resistive component of the leakage current in surge protectors is an important parameter to characterize its aging.Monitoring the trend of resistive components and extracting the fundamental and third harmonic peaks is of great significance for monitoring the aging of surge protectors. Starting from the equivalent model,the expression of the correlation coefficient k of the surge protector is calculated by using the leakage current. The analysis verifies that the k value is negatively correlated with the resistive component,especially the third harmonic,and that the change of the resistive current can be monitored by the k value. Furthermore,an improved method is proposed to solve the problems,for example,capacitive current compensation method to extract resistive components by harmonic interference,phase-shift current method is not applicable to the case of small resistive components. The improved method determines the fundamental frequency and phase shift angle by performing zero-crossing detection,low-pass filtering,and phase measurement on the leakage current. The phase relationship among the components is used to solve for capacitive currents and to extract resistive components. This method is applied to the simulation and actual data,and FFT analysis of the extracted resistive currents is performed. The results show that the extraction accuracy of the fundamental and harmonic wave of the resistive current is improved.
The resistive component of the leakage current in surge protectors is an important parameter to characterize its aging.Monitoring the trend of resistive components and extracting the fundamental and third harmonic peaks is of great significance for monitoring the aging of surge protectors. Starting from the equivalent model,the expression of the correlation coefficient k of the surge protector is calculated by using the leakage current. The analysis verifies that the k value is negatively correlated with the resistive component,especially the third harmonic,and that the change of the resistive current can be monitored by the k value. Furthermore,an improved method is proposed to solve the problems,for example,capacitive current compensation method to extract resistive components by harmonic interference,phase-shift current method is not applicable to the case of small resistive components. The improved method determines the fundamental frequency and phase shift angle by performing zero-crossing detection,low-pass filtering,and phase measurement on the leakage current. The phase relationship among the components is used to solve for capacitive currents and to extract resistive components. This method is applied to the simulation and actual data,and FFT analysis of the extracted resistive currents is performed. The results show that the extraction accuracy of the fundamental and harmonic wave of the resistive current is improved.
引文
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[16]刘振莉,郭洁,金青,等.交流Zn O电阻片小电流区阻性、容性电流与电压关系研究[J].电瓷避雷器,2012(5):70-73.LIU ZH L,GUO J,JIN Q,et al.Research on the relationship between the voltage and the resistive current,capacitive current in low current of MOV[J].Insulators&Surge Arresters,2012(5):70-73.
[17]杨仲江,曹洪亮,李鹏飞,等.基于遗传算法的金属氧化物避雷器在线监测[J].高电压技术,2015,41(9):3104-3109.YANG ZH J,CAO H L,LI P F,et al.On-line monitoring of metal oxide arrester using genetic algorithm[J].High Voltage Engineering,2015,41(9):3104-3109.
[18]王永强,律方成,张柯,等.考虑电网谐波影响的MOA在线检测方法[J].高电压技术,2003,29(9):24-25.WANG Y Q,LV F CH,ZHANG K,et al.On-line monitoring of MOA considering the influence of humorous voltage in power system[J].High Voltage Engineering,2003,29(9):24-25.
[19]杨德友,王博,蔡国伟.基于改进自适应局部迭代滤波的谐波检测方法研究[J].仪器仪表学报,2016,37(10):2274-2281.YANG D Y,BO W,CAI G W.Study on the harmonic detection method based on improved adaptive local iterative filtering[J].Chinese Journal of Scientific Instrument,2016,37(10):2274-2281.
[20]陈炯,徐璐琪,徐广鹦.基于三次谐波法的避雷器阻性电流测量方法研究[J].电测与仪表,2016,53(23):34-37.CHEN J,XU L Q,XU G Y.Research on detection method of MOA resistance leakage current based on third harmonic component[J].Electrical Measurement&Instrumentation,2016,53(23):34-37.
[2]孟鹏飞,胡军,邬锦波,等.氧化锌压敏电阻综合性能的多元掺杂综合调控[J].高电压技术,2018,44(1):241-247.MENG P F,HU J,WU J B,et al.Comprehensive performances of Zn O varistors tailored by multi-elements doping[J].High Voltage Engineering,2018,44(1):241-247.
[3]周宏伟,肖扬.氧化锌压敏电阻变温率及拐点效应研究[J].电瓷避雷器,2017(3):129-132.ZHOU H Y,XIAO Y.Temperature change rate and inflection point effect of zinc oxide varistor[J].Insulators&Surge Arresters,2017(3):129-132.
[4]高峰,郭洁,徐欣,等.交流金属氧化物避雷器受潮与阻性电流的关系[J].高电压技术,2009,35(11):2629-2633.GAO F,GUO J,XU X,et al.Relation between resistive current and MOA affected with damp[J].High Voltage Engineering,2009,35(11):2629-2633.
[5]常越,钱家骊.LCD-4仪器检测三相氧化锌避雷器阻性电流的分析[J].高电压技术,1995(2):77-80.CHANG Y,QIAN J L.Analysis on resistive leakage current of Zn O surge arresters detected LCD-4 instrument[J].High Voltage Engineering,1995,21(4):37-38.
[6]汲胜昌,杨兰均,李彦明,等.在线监测氧化锌避雷器的容性电流补偿法[J].高电压技术,2000,26(4):16-18.JI SH CH,YANG L J,LI Y M,et al.Capacitive current compensation method for Zn O surge arrester's on-line monitoring[J].High Voltage Engineering,2000,26(4):16-18.
[7]党克,赵思敏,于盛祥,等.消除直流分量影响和谐波干扰的并网同步方法[J].电子测量与仪器学报,2016,30(10):1551-1557.DANG K,ZHAO S M,YU SH X,et al.Grid synchronization method for eliminating DC component and harmonics influence[J].Journal of Electronic Measurement and Instrumentation,2016,30(10):1551-1557.
[8]ABDUL-MALEK Z,NOVIZON,AULIA.A new method to extract the resistive component of the metal oxide surge arrester leakage current[C].IEEE 2nd International Power and Energy Conference,2009:399-402.
[9]ABDUL-MALEK Z,YUSOFF N,YOUSOF M F M.Field experience on surge arrester condition monitoring:Modified shifted current method[C].Universities Power Engineering Conference,2010:1-5.
[10]曹洪亮,谭涌波,李鹏飞,等.一种简便的阻性电流提取算法[J].电瓷避雷器,2015(5):115-118.CAO H L,TAN Y B,LI P F,et al.A simple algorithm to extract the resistive current[J].Insulators&Surge Arresters,2015(5):115-118.
[11]KHODSUZ M,MIRZAIE M.A modified time-delay addition method to extract resistive leakage current of MOSA[J].Journal of the Institution of Engineers,2016,97(4):445-451.
[12]KHODSUZ M,MIRZAIE M.An improved time-delay addition method for MOSA resistive leakage current extraction under applied harmonic voltage[J].Measurement,2016(77):327-334.
[13]何贵先,行鸿彦,季鑫源,等.金属氧化物避雷器在线监测的谐波校正及研究[J].电子测量与仪器学报,2017,31(10):1549-1554.HE G X,XING H Y,JI X Y,et al.Harmonic correction and study for MOA on-line monitoring algorithm[J].Journal of Electronic Measurement&Instrumentation,2017,31(10):1549-1554.
[14]陈新岗,李凡,桑建平.氧化锌压敏陶瓷伏安特性的微观解析[J].高电压技术,2007,33(4):33-37.CHEN X G,LI F,SANG J P.Microcosmic analysis of U-I characteristic of Zn O pressure-sensitive ceramics[J].High Voltage Engineering,2007,33(4):33-37.
[15]赵伟,万德均,岳建民.金属氧化物避雷器带电测量相间干扰研究[J].仪器仪表学报,2006,27(1):87-90.ZHAO W,WAN D J,YUE J M.Study on interphase interference of measurement of metal oxide arrester on line[J].Chinese Journal of Scientific Instrument,2006,27(1):87-90.
[16]刘振莉,郭洁,金青,等.交流Zn O电阻片小电流区阻性、容性电流与电压关系研究[J].电瓷避雷器,2012(5):70-73.LIU ZH L,GUO J,JIN Q,et al.Research on the relationship between the voltage and the resistive current,capacitive current in low current of MOV[J].Insulators&Surge Arresters,2012(5):70-73.
[17]杨仲江,曹洪亮,李鹏飞,等.基于遗传算法的金属氧化物避雷器在线监测[J].高电压技术,2015,41(9):3104-3109.YANG ZH J,CAO H L,LI P F,et al.On-line monitoring of metal oxide arrester using genetic algorithm[J].High Voltage Engineering,2015,41(9):3104-3109.
[18]王永强,律方成,张柯,等.考虑电网谐波影响的MOA在线检测方法[J].高电压技术,2003,29(9):24-25.WANG Y Q,LV F CH,ZHANG K,et al.On-line monitoring of MOA considering the influence of humorous voltage in power system[J].High Voltage Engineering,2003,29(9):24-25.
[19]杨德友,王博,蔡国伟.基于改进自适应局部迭代滤波的谐波检测方法研究[J].仪器仪表学报,2016,37(10):2274-2281.YANG D Y,BO W,CAI G W.Study on the harmonic detection method based on improved adaptive local iterative filtering[J].Chinese Journal of Scientific Instrument,2016,37(10):2274-2281.
[20]陈炯,徐璐琪,徐广鹦.基于三次谐波法的避雷器阻性电流测量方法研究[J].电测与仪表,2016,53(23):34-37.CHEN J,XU L Q,XU G Y.Research on detection method of MOA resistance leakage current based on third harmonic component[J].Electrical Measurement&Instrumentation,2016,53(23):34-37.