直流XLPE电缆绝缘泄漏电流与局部放电试验特征研究
|
摘要
目前,直流电缆制造技术及工程空前发展,然而,国内外关于直流电压下XLPE电缆故障特征及劣化规律研究极少。局部放电和泄漏电流是电缆绝缘状态的两种重要表征手段。文中搭建了局部放电和泄漏电流联合检测试验平台,研究了绝缘内部气隙、主绝缘表面划伤以及金属毛刺电晕3种缺陷的局部放电和泄漏电流试验特征。结合理论分析及仿真,首先研究了放电量、放电重复率以及泄漏电流幅值间的相关性。之后,基于Shannon熵、互信息等分析手段,研究了不同极性电压下泄漏电流和施加电压间相关特征。综合来看,正常电缆、气隙缺陷、电晕缺陷在负极性电压下的泄漏电流-电压曲线,比正极性电压下的呈现更强线性相关性;划伤缺陷在正、负极性下的泄漏电流-电压间线性相关性均比较明显。该研究对电缆现场状态检测策略的研究具有重要价值。
At present,the manufacturing technology and engineering of DC cable systems has been developed quickly.However,there are few studies on the operation,fault characteristics and degradation of XLPE cables under DC voltage.Partial discharge and leakage current are two important characterization means of cable insulation.The joint test platform of partial discharge and leakage current is built.The characteristics of partial discharge and leakage current of three kinds of typical defects are studied.The defects are the air gap inside XLPE,the scratch on the insulation surface and the corona discharge.Combined with theoretical analysis and simulation,the correlations among the discharge capacity,discharge repetition rate and the leakage current amplitude are studied.After that,based on Shannon entropy and mutual information analysis,the correlation between leakage current and applied voltage is studied.In summary,the correlation between the leakage current and voltage of normal cable,air-gap defect and corona defect under negative voltage shows a stronger linear correlation than that under positive voltage.Both of the linear correlations between the leakage current and voltage under positive and negative polarity of scratch defects are obvious.Studies in this paper are of great value for cable status detection.
At present,the manufacturing technology and engineering of DC cable systems has been developed quickly.However,there are few studies on the operation,fault characteristics and degradation of XLPE cables under DC voltage.Partial discharge and leakage current are two important characterization means of cable insulation.The joint test platform of partial discharge and leakage current is built.The characteristics of partial discharge and leakage current of three kinds of typical defects are studied.The defects are the air gap inside XLPE,the scratch on the insulation surface and the corona discharge.Combined with theoretical analysis and simulation,the correlations among the discharge capacity,discharge repetition rate and the leakage current amplitude are studied.After that,based on Shannon entropy and mutual information analysis,the correlation between leakage current and applied voltage is studied.In summary,the correlation between the leakage current and voltage of normal cable,air-gap defect and corona defect under negative voltage shows a stronger linear correlation than that under positive voltage.Both of the linear correlations between the leakage current and voltage under positive and negative polarity of scratch defects are obvious.Studies in this paper are of great value for cable status detection.
引文
[1]何金良,党斌,周垚,等.挤压型高压直流电缆研究进展及关键技术述评[J].高电压技术,2015,41(5):1417-1429.HE Jinliang,DANG Bin,ZHOU Yao,et al.Reviews on research progress and key technology in extruded cables for HVDC transmission[J].High Voltage Engineering,2015,41(5):1417-1429.
[2]周远翔,赵健康,刘睿,等.高压/超高压电力电缆关键技术分析及展望[J].高电压技术,2014,40(9):2593-2612.ZHOU Yuanxiang,ZHAO Jiankang,LIU Rui,et al.Key technical analysis and prospect of high voltage and extrahigh voltage power cable[J].High Voltage Engineering,2014,40(9):2593-2612.
[3]谢书鸿,傅明利,尹毅,等.中国交联聚乙烯绝缘高压直流电缆发展的三级跳:从160 kV到200 kV再到320 kV[J].南方电网技术,2015,9(10):5-12.XIE Shuhong,FU Mingli,YIN Yi,et al.Triple jumps of XLPE insulated HVDC cable development in China:from160 kV to 200 kV and then to 320 kV[J].Southern Power System Technology,2015,9(10):5-12.
[4]沈小军.城市轨道交通直流馈出电缆在线监测技术[D].上海:上海交通大学,2007.SHEN Xiaojun.On-line monitoring technology of direct current feeder cable of urban mass transit[D].Shanghai:Shanghai Jiao Tong University,2007.
[5]牛海清,陈小林,CAVALLINI A,MONTANARI G C,等.高压直流局部放电的试验研究及其放电源识别策略[J].高电压技术,2009,35(7):1641-1647.NIUHai qing,CHEN Xiao lin,CAVALLINI A,et al.Experimental research on partial discharge at HVDCVoltage and identification of PD source[J].High Voltage Engineering,2009,35(7):1641-1647.
[6]MORSHUIS P H,SMIT J J.Partial Discharges at DC voltage:Their mechanism,detection and analysis[J].IEEE Transactions on Dielectrics and Electrical Insulation,2005,12(2):328-340.
[7]郭灿新,张丽,钱勇,等.XLPE电力电缆中局部放电检测及定位技术的研究现状[J].高压电器,2009,45(3):56-60.GUO Canxin,ZHANG Li,QIAN Yong,et al.Current status of partial discharge detection and location techniques in XLPE power cable[J].High Voltage Apparatus,2009,45(3):56-60.
[8]WORZYK T.海底电力电缆-设计、安装、修复和环境影响[M].应启良,徐晓峰,孙建生,译.北京:机械工业出版社,2011:76-83.WORZYK T.Submarine power cables:design,installation,repair,environmental aspects[M].YING Qiliang,XUXiaofeng,SUN Jiansheng,Translate.Beijing:Machinery Industry Press,2011:76-83.
[9]康强,钱森,徐阳,等.高压直流XLPE海缆现场试验方法综述[J].绝缘材料,2015,48(8):8-14.KANG Qiang,QIAN Sen,XU Yang,et al.Review of field test methods of high voltage direct current XLPE submarine cable[J].Insulating Materials,2015,48(8):8-14.
[10]王亚夫.油浸纸绝缘电力电缆泄漏电流检测方法的探讨[J].电线电缆,1998(2):32-34.WANG Yafu.Discussion on leakage current detection method of oil-immersed paper insulated power cable[J].Wire&Cable,1998(2):32-34.
[11]亢松涛,席世奇.电缆泄漏电流和直流耐压试验分析[J].大众用电,2009(11):28-29.KANG Songtao,XI Shiqi.Analysis of leakage current and DC voltage withstand test of cable[J].Popular Utilization of Electricity 2009(11):28-29.
[12]MORSHUIS P.Defects and interfaces at DC voltage[C]//2011 International Conference on Electrical Insulating Materials(ISEIM).[S.l.]:IEEE,2011:517-523.
[13]FROMM U,KREUGER F H.Statistical behaviour of internal partial discharges at DC voltage[J].Japanese Journal of Applied Physics,1994,33(12R):6708.
[14]KREUGER F H.Industrial high DC voltage[M].Delft:Delft University Press,1995.
[15]FROMM U.Partial discharge and breakdown testing at high DC voltage[J].IEEE Transactions on Dielectrics and Electrical Insulation,1995,2(5):761-770.
[16]赵林杰,赵晓斌,厉天威,等.多端柔性直流输电系统中±160 k V XLPE绝缘电缆系统设计与选型[J].高电压技术,2014,40(9):2635-2643.ZHAO Linjie,ZHAO Xiaobin,LI Tianwei,et al.Design and Selection of±160 kV XLPE insulated cable system for multi-terminal vsc hvdc power transmission system[J].High Voltage Engineering,2014,40(9):2635-2643.
[17]顾金,王俏华,李旭光,等.30 kV直流XLPE电缆电场及温度场的仿真计算[J].电线电缆,2009,40(9):9-12.GU Jin,WANG Qiaohua,LI Xuguang,et al.Simulation of electric field and temperature field in 30 kV DC XLPEcable[J].Electric Wire&Cable,2009,40(9):9-12.
[18]REDDY C C,RAMU T S.On the computation of electric field and temperature distribution in HVDC cable insulation[J].IEEE Transactions on Dielectrics and Electrical Insulation,2006,13(6):1236-1244.
[19]MOON Y I,RAJAGOPALAN B,LALL U.Estimation of mutual information using kernel density estimators[J].Physical Review E,1995,52(3):2318-2321.
[20]曾金芳,滕召胜.信息熵在曲线拟合辨识中的应用[J].电子测量与仪器学报,2012,26(2):171-176.ZENG Jinfang,TENG Zhaosheng.Application of information entropy in curve fitting recognition[J].Journal of Electronic Measurement and Instrument,2012,26(2):171-176.
[2]周远翔,赵健康,刘睿,等.高压/超高压电力电缆关键技术分析及展望[J].高电压技术,2014,40(9):2593-2612.ZHOU Yuanxiang,ZHAO Jiankang,LIU Rui,et al.Key technical analysis and prospect of high voltage and extrahigh voltage power cable[J].High Voltage Engineering,2014,40(9):2593-2612.
[3]谢书鸿,傅明利,尹毅,等.中国交联聚乙烯绝缘高压直流电缆发展的三级跳:从160 kV到200 kV再到320 kV[J].南方电网技术,2015,9(10):5-12.XIE Shuhong,FU Mingli,YIN Yi,et al.Triple jumps of XLPE insulated HVDC cable development in China:from160 kV to 200 kV and then to 320 kV[J].Southern Power System Technology,2015,9(10):5-12.
[4]沈小军.城市轨道交通直流馈出电缆在线监测技术[D].上海:上海交通大学,2007.SHEN Xiaojun.On-line monitoring technology of direct current feeder cable of urban mass transit[D].Shanghai:Shanghai Jiao Tong University,2007.
[5]牛海清,陈小林,CAVALLINI A,MONTANARI G C,等.高压直流局部放电的试验研究及其放电源识别策略[J].高电压技术,2009,35(7):1641-1647.NIUHai qing,CHEN Xiao lin,CAVALLINI A,et al.Experimental research on partial discharge at HVDCVoltage and identification of PD source[J].High Voltage Engineering,2009,35(7):1641-1647.
[6]MORSHUIS P H,SMIT J J.Partial Discharges at DC voltage:Their mechanism,detection and analysis[J].IEEE Transactions on Dielectrics and Electrical Insulation,2005,12(2):328-340.
[7]郭灿新,张丽,钱勇,等.XLPE电力电缆中局部放电检测及定位技术的研究现状[J].高压电器,2009,45(3):56-60.GUO Canxin,ZHANG Li,QIAN Yong,et al.Current status of partial discharge detection and location techniques in XLPE power cable[J].High Voltage Apparatus,2009,45(3):56-60.
[8]WORZYK T.海底电力电缆-设计、安装、修复和环境影响[M].应启良,徐晓峰,孙建生,译.北京:机械工业出版社,2011:76-83.WORZYK T.Submarine power cables:design,installation,repair,environmental aspects[M].YING Qiliang,XUXiaofeng,SUN Jiansheng,Translate.Beijing:Machinery Industry Press,2011:76-83.
[9]康强,钱森,徐阳,等.高压直流XLPE海缆现场试验方法综述[J].绝缘材料,2015,48(8):8-14.KANG Qiang,QIAN Sen,XU Yang,et al.Review of field test methods of high voltage direct current XLPE submarine cable[J].Insulating Materials,2015,48(8):8-14.
[10]王亚夫.油浸纸绝缘电力电缆泄漏电流检测方法的探讨[J].电线电缆,1998(2):32-34.WANG Yafu.Discussion on leakage current detection method of oil-immersed paper insulated power cable[J].Wire&Cable,1998(2):32-34.
[11]亢松涛,席世奇.电缆泄漏电流和直流耐压试验分析[J].大众用电,2009(11):28-29.KANG Songtao,XI Shiqi.Analysis of leakage current and DC voltage withstand test of cable[J].Popular Utilization of Electricity 2009(11):28-29.
[12]MORSHUIS P.Defects and interfaces at DC voltage[C]//2011 International Conference on Electrical Insulating Materials(ISEIM).[S.l.]:IEEE,2011:517-523.
[13]FROMM U,KREUGER F H.Statistical behaviour of internal partial discharges at DC voltage[J].Japanese Journal of Applied Physics,1994,33(12R):6708.
[14]KREUGER F H.Industrial high DC voltage[M].Delft:Delft University Press,1995.
[15]FROMM U.Partial discharge and breakdown testing at high DC voltage[J].IEEE Transactions on Dielectrics and Electrical Insulation,1995,2(5):761-770.
[16]赵林杰,赵晓斌,厉天威,等.多端柔性直流输电系统中±160 k V XLPE绝缘电缆系统设计与选型[J].高电压技术,2014,40(9):2635-2643.ZHAO Linjie,ZHAO Xiaobin,LI Tianwei,et al.Design and Selection of±160 kV XLPE insulated cable system for multi-terminal vsc hvdc power transmission system[J].High Voltage Engineering,2014,40(9):2635-2643.
[17]顾金,王俏华,李旭光,等.30 kV直流XLPE电缆电场及温度场的仿真计算[J].电线电缆,2009,40(9):9-12.GU Jin,WANG Qiaohua,LI Xuguang,et al.Simulation of electric field and temperature field in 30 kV DC XLPEcable[J].Electric Wire&Cable,2009,40(9):9-12.
[18]REDDY C C,RAMU T S.On the computation of electric field and temperature distribution in HVDC cable insulation[J].IEEE Transactions on Dielectrics and Electrical Insulation,2006,13(6):1236-1244.
[19]MOON Y I,RAJAGOPALAN B,LALL U.Estimation of mutual information using kernel density estimators[J].Physical Review E,1995,52(3):2318-2321.
[20]曾金芳,滕召胜.信息熵在曲线拟合辨识中的应用[J].电子测量与仪器学报,2012,26(2):171-176.ZENG Jinfang,TENG Zhaosheng.Application of information entropy in curve fitting recognition[J].Journal of Electronic Measurement and Instrument,2012,26(2):171-176.