能量比函数法估算局部放电时延迟
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摘要
GIS局部放电在线检测中信号到达的前沿包含了重要的定位信息,但该电磁波信号在较狭小的管道中传播,使其波形变得十分复杂,采用峰值法、相关法等方法难有满意效果,因此提出了能量比函数法,即构筑一个滑动的窗口并求取窗体内的干扰能量和信号能量的比值来确定信号到达的前沿。在求取受强噪声干扰、经过多路传递的信号时延的计算上该法较其它方法简单实用,计算参数易于选择,算法稳定性高。算例表明,在信噪比较高的高压局部放电试验中,计算的结果与理论值非常接近,对于信噪比较低的试验波形,仍能够成功的求取信号的时间差。
The frontier of signals arrival contains some important information for the on-line monitoring system of partial discharges of GIS.The electromagnetic wave produced by partial discharges is transmitted in quite a narrow pipeline,and the discharge wave form becomes terribly complex,so the methods can not satisfy the needs of high signal-to-noise ratio.By setting a slip window on the time axis and dividing it into two units,calculating the average energe separately and making division,an energy ratio in the time window is gotten.This paper gives an arithmetic example(time window 34ns) about partial discharges of 110kV GIS.The result shows that,for the discharge signals with higher signal-to-noise ratio,the theoretical delay is 7.34ns while the calculating value is 7.6ns,which approaches greatly to the theoretical value;when there are fuzzy frontier of signals and lower signal-to-noise ratio,the calculating result is 9.2ns,1.86ns beyond the theoretical value,and the error is within acceptable ranges.There will be little influence by choosing the length of time window for wave with higher signal-to-noise ratio,but it is sensible to wave with fuzzy frontier of signals.In common conditions the shorter window is better,whose precondition is that there must be larger signal amplitude in the signal unit.
The frontier of signals arrival contains some important information for the on-line monitoring system of partial discharges of GIS.The electromagnetic wave produced by partial discharges is transmitted in quite a narrow pipeline,and the discharge wave form becomes terribly complex,so the methods can not satisfy the needs of high signal-to-noise ratio.By setting a slip window on the time axis and dividing it into two units,calculating the average energe separately and making division,an energy ratio in the time window is gotten.This paper gives an arithmetic example(time window 34ns) about partial discharges of 110kV GIS.The result shows that,for the discharge signals with higher signal-to-noise ratio,the theoretical delay is 7.34ns while the calculating value is 7.6ns,which approaches greatly to the theoretical value;when there are fuzzy frontier of signals and lower signal-to-noise ratio,the calculating result is 9.2ns,1.86ns beyond the theoretical value,and the error is within acceptable ranges.There will be little influence by choosing the length of time window for wave with higher signal-to-noise ratio,but it is sensible to wave with fuzzy frontier of signals.In common conditions the shorter window is better,whose precondition is that there must be larger signal amplitude in the signal unit.
引文
[1]Lu Y,Tan X,Hu X.PD detection and localization by acousticmeasurements in an oil-filled transformer[J].IEE Porc-Sci MeasTechnol,2000,147(2):81-85.
[2]桂俊峰,高文胜,吴振声,等.能量比值法定位变压器局部放电[J].高电压技术,2006,32(1):38-40.GUI Jun-feng,GAO Wen-sheng,WUZhen-sheng,et al.Loca-tion of partial discharge in transformer by energy ratio method[J].High Voltage Engineering,2006,32(1):38-40.
[3]毛汉领,陈仲仪,庄红宇.能量比时间延迟估计法及在定位中的应用[J].广西工学院学报,1994(2):12-16.
[4]左国平,王彦春,隋荣亮.利用能量比法拾取地震初至的一种改进方法[J].石油物探,2004,43(4):35-37.
[5]姜玉磊,卢毅,田新启.GIS局部放电在线检测系统开发[J].江苏电机工程,2005,24(2):16-17.
[6]Christophorou L G,Olthoff J K,Van Brunt RJ.Sulfur hexafluo-ride and the electric power industry[J].IEEE Electrical Insula-tion Magazine,1997,13(5):20-24.
[7]Masatake Kawada,Ampol Tungkanawanich,Zen-Ichiro Kawasa-ki.Detection of wide-band E-Msignals emitted frompartial dis-charge occurring in GIS using wavelet transform[J].IEEETransactions on Power Delivery,2000,15(2):467-471.
[8]Toshihiro Hoshino,Katsumi Kato,Naoki Hayakawa.Frequen-cy characteristics of electromagnetic wave radiated from GIS ap-ertures[J].IEEE Trans on PWRD,2001,16(4):552-557.
[9]Marsden HI,Dale S J,Hopkins M D,et al.High voltage per-formance of a gas insulated cable with N2and N2/SF6mixture[C].10th ISH.Montreal,Canada,1997.
[10]Yashi ma M,Kawamoto T,Fujinami H,et al.Astudy on break-down characteristics of hybrid gas insulated transmission line[C].10th ISH.Montreal,Canada,1997.
[11]邱毓昌.用超高频法对GIS绝缘进行在线监测[J].高压电器,1997,33(4):36-40.QI U Yu-chang.UHF method used for insulation on-line moni-toringin GIS[J].High Voltage Apparatus,1997,33(4):36-40.
[12]刘卫东,金立军,黄家旗,等.日本SF6电器局部放电监测技术研究近况[J].高电压技术,2001,27(2),76-78.LI U Wei-dong,JI N Li-jun,QI ANJia-li,et al.Review of re-cent researches on PD monitoringin gas insulated equipment inJapan[J].High Voltage Engineering,2001,27(2):76-78.
[13]成永红.电力设备绝缘检测与诊断[M].北京:中国电力出版社,2001.
[14]卢毅,松浦文士.GIS局部放电的非接触在线监测[J].高电压技术,1997,23(1):6-8.LU Yi,SONGPU Wen-shi.On-line and non-contact monito-ring of paitial discharge for GIS[J].High Voltage Engineer-ing,1997,23(3):6-8.
[15]邵涛,周文俊,朱宜飞,等.特高频法检测GIS局部放电的试验研究[J].高电压技术,2001,27(3):15-17.SHAO Tao,ZHOU Wen-jun,ZHU Yi-fei,et al.Experi mentalresearch of UHF method for the detection of partial dischargein GIS[J].High Voltage Engineering,2001,27(3):15-17.
[16]刘卫东,黄瑜珑,王剑锋.GIS局部放电特高频在线检测和定位[J].高压电器1999,35(1):11-15.LI U Wei-dong,HUANG Yu-long,WANG Jian-feng.UHFsignal extraction for GIS partial discharge detection[J].HighVoltage Apparatus,1999,35(1):11-15.
[2]桂俊峰,高文胜,吴振声,等.能量比值法定位变压器局部放电[J].高电压技术,2006,32(1):38-40.GUI Jun-feng,GAO Wen-sheng,WUZhen-sheng,et al.Loca-tion of partial discharge in transformer by energy ratio method[J].High Voltage Engineering,2006,32(1):38-40.
[3]毛汉领,陈仲仪,庄红宇.能量比时间延迟估计法及在定位中的应用[J].广西工学院学报,1994(2):12-16.
[4]左国平,王彦春,隋荣亮.利用能量比法拾取地震初至的一种改进方法[J].石油物探,2004,43(4):35-37.
[5]姜玉磊,卢毅,田新启.GIS局部放电在线检测系统开发[J].江苏电机工程,2005,24(2):16-17.
[6]Christophorou L G,Olthoff J K,Van Brunt RJ.Sulfur hexafluo-ride and the electric power industry[J].IEEE Electrical Insula-tion Magazine,1997,13(5):20-24.
[7]Masatake Kawada,Ampol Tungkanawanich,Zen-Ichiro Kawasa-ki.Detection of wide-band E-Msignals emitted frompartial dis-charge occurring in GIS using wavelet transform[J].IEEETransactions on Power Delivery,2000,15(2):467-471.
[8]Toshihiro Hoshino,Katsumi Kato,Naoki Hayakawa.Frequen-cy characteristics of electromagnetic wave radiated from GIS ap-ertures[J].IEEE Trans on PWRD,2001,16(4):552-557.
[9]Marsden HI,Dale S J,Hopkins M D,et al.High voltage per-formance of a gas insulated cable with N2and N2/SF6mixture[C].10th ISH.Montreal,Canada,1997.
[10]Yashi ma M,Kawamoto T,Fujinami H,et al.Astudy on break-down characteristics of hybrid gas insulated transmission line[C].10th ISH.Montreal,Canada,1997.
[11]邱毓昌.用超高频法对GIS绝缘进行在线监测[J].高压电器,1997,33(4):36-40.QI U Yu-chang.UHF method used for insulation on-line moni-toringin GIS[J].High Voltage Apparatus,1997,33(4):36-40.
[12]刘卫东,金立军,黄家旗,等.日本SF6电器局部放电监测技术研究近况[J].高电压技术,2001,27(2),76-78.LI U Wei-dong,JI N Li-jun,QI ANJia-li,et al.Review of re-cent researches on PD monitoringin gas insulated equipment inJapan[J].High Voltage Engineering,2001,27(2):76-78.
[13]成永红.电力设备绝缘检测与诊断[M].北京:中国电力出版社,2001.
[14]卢毅,松浦文士.GIS局部放电的非接触在线监测[J].高电压技术,1997,23(1):6-8.LU Yi,SONGPU Wen-shi.On-line and non-contact monito-ring of paitial discharge for GIS[J].High Voltage Engineer-ing,1997,23(3):6-8.
[15]邵涛,周文俊,朱宜飞,等.特高频法检测GIS局部放电的试验研究[J].高电压技术,2001,27(3):15-17.SHAO Tao,ZHOU Wen-jun,ZHU Yi-fei,et al.Experi mentalresearch of UHF method for the detection of partial dischargein GIS[J].High Voltage Engineering,2001,27(3):15-17.
[16]刘卫东,黄瑜珑,王剑锋.GIS局部放电特高频在线检测和定位[J].高压电器1999,35(1):11-15.LI U Wei-dong,HUANG Yu-long,WANG Jian-feng.UHFsignal extraction for GIS partial discharge detection[J].HighVoltage Apparatus,1999,35(1):11-15.
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