基于PDC法的在运XLPE电缆绝缘状态评估
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摘要
在运交联聚乙烯(cross-linked polyethylene, XLPE)电缆的绝缘状态评估对于提高配网系统的供电可靠性有重要的意义。利用极化/去极化电流法(polarization and depolarization current, PDC)对某电力公司辖区内不同绝缘状态的8条退役和24条在运10 kV XLPE电缆进行了测试,并采用能够反映电介质内部陷阱变化的参数A和反映极化过程中电荷量迁移的参数Q进行表征,最后利用斯皮尔曼秩相关系数法建立A/Q值与电缆信息的相关性,并求解了敏感度、影响程度以判断电缆的老化状态。实验结果表明:PDC法不仅可以用于电缆整体的绝缘诊断,也可以发现电缆的局部受潮与老化现象;而根据电缆老化程度与运行年限、负荷类型、长度、敷设方式等台账信息之间关系提出的判断方法,可以找出潜在的高危老化电缆。综上所述,PDC法可以提高在运电缆诊断效率和准确性,而在日常运维工作中应重点关注非直埋敷设且位于市中心的长电缆绝缘状态。
Evaluation of the insulation status of in-service cross-linked polyethylene(XLPE) cable is very important for improving the reliability of distribution system. In this paper, 8 unserviceable and 24 in-service 10 k V XLPE cables of different insulation status belonging to a power company were tested based on the polarization and depolarization current(PDC) method. Meanwhile, A and Q were used as characterization parameters, which can represent the dielectric traps inside band gap and discharge capacity during polarization process respectively. Finally, The Spearman's correlation coefficient was used to establish the correlation between A/Q value and cable information, and the sensitivity and influence degree were calculated to judge the aging state of cables. The results show that the PDC method can be used not only for the whole cable insulation diagnosis, but also for the confirmation of local dampness and aging phenomenon. The urgency method based on the relationship between aging degrees and basic information, such as service year, load type,length and laying way can be adopted to find the potential high-risk aging cables. In conclusion, the PDC method is able to improve the cable maintenance efficiency and accuracy, and the insulation status of non-direct buried downtown long power cables should be paid more attention to in daily maintenance.
Evaluation of the insulation status of in-service cross-linked polyethylene(XLPE) cable is very important for improving the reliability of distribution system. In this paper, 8 unserviceable and 24 in-service 10 k V XLPE cables of different insulation status belonging to a power company were tested based on the polarization and depolarization current(PDC) method. Meanwhile, A and Q were used as characterization parameters, which can represent the dielectric traps inside band gap and discharge capacity during polarization process respectively. Finally, The Spearman's correlation coefficient was used to establish the correlation between A/Q value and cable information, and the sensitivity and influence degree were calculated to judge the aging state of cables. The results show that the PDC method can be used not only for the whole cable insulation diagnosis, but also for the confirmation of local dampness and aging phenomenon. The urgency method based on the relationship between aging degrees and basic information, such as service year, load type,length and laying way can be adopted to find the potential high-risk aging cables. In conclusion, the PDC method is able to improve the cable maintenance efficiency and accuracy, and the insulation status of non-direct buried downtown long power cables should be paid more attention to in daily maintenance.
引文
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[14]郑建康,赵艾萱,林涛,等.高频冲击电压对XLPE电缆介电响应特性的影响[J].智慧电力,2018,46(5):46-52.ZHENG Jiankang,ZHAO Aixuan,LIN Tao,et al.Effect of high frequency impulse voltage upon dielectric response of XLPE cables[J].Smart Power,2018,46(5):46-52.
[15]董明,王丽,吴雪舟,等.油纸绝缘介电响应检测技术研究现状与发展[J].高电压技术,2016,42(4):1179-1189.DONG Ming,WANG Li,WU Xuezhou,et al.Status and progress in study of dielectric response technology for oil-paper insulation[J].High Voltage Engineering,2016,42(4):1179-1189.
[16]LEIBFRIED T,KACHLER A J.Insulation diagnostics on power transformers using the polarisation and depolarisation current(PDC)analysis[C]∥Conference Record of the 2002 IEEE International Symposium on Electrical Insulation.Boston,USA:IEEE,2002:170-173.
[17]SIMMONS J G,TAYLOR G W,TAM M C.Thermally stimulated currents in semiconductors and insulators having arbitrary trap distributions[J].Physical Review B,1973,7(8):3714-3719.
[18]BIRKNER P.Field experience with a condition-based maintenance program of 20 k V XLPE distribution system using IRC-analysis[J].IEEE Transactions on Power Delivery,2004,19(1):3-8.
[19]ALLAN R N AND BILLINTON R.Reliability evaluation of engineering system[M].New York,USA:Plenum Press,1992.
[20]俞大刚.线性回归模型分析[M].北京:中国统计出版社,1987.YU Dagang.Analysis of linear regression model[M].Beijing,China:China Statistics Press,1987.
[21]张尧庭.我们应该选用什么样的相关性指标[J].统计研究,2002,19(9):41-44.ZHANG Yaoting.What co-relative indicators should we employ[J].Statistical Research,2002,19(9):41-44.
[22]ZAR J.Spearman rank correlation[M].New York,USA:Encyclopedia of Biostatistics,2004.
[23]袁建文,李科研.关于样本量计算方法的比较研究[J].统计与决策,2013,32(1):22-25.YUAN Jianwen,LI Keyan.A comparative study of the method of calculating sample size[J].Statistics and Decision,2013,32(1):22-25.
[24]刘剑,张勇,杜志叶,等.交流输电线路设计中的全寿命周期成本敏感度分析[J].高电压技术,2010,36(6):1554-1559.LIU Jian,ZHANG Yong,DU Zhiye,et al.Life cycle cost sensitivity analysis in AC transmission lines design[J].High Voltage Engineering,2010,36(6):1554-1559.
[25]ANDERS G J,RADHAKRISHNA H S.Power cable thermal analysis with consideration of heat and moisture transfer in the soil[J].IEEETransactions on Power Delivery,1988,3(4):1280-1288.
[2]òRRIT J.Identification of dipolar relaxations in dielectric spectra of mid-voltage cross-linked polyethylene cables[J].Journal of Electrostatics,2011,69(2):119-125.
[3]BEIGERT M,KRANZ H G.Destruction free ageing diagnosis of power cable insulation using the isothermal relaxation current analysis[C]∥Conference Record of the 1994 IEEE International Symposium on Electrical Insulation.Pittsburgh,USA:IEEE,1994:17-21.
[4]OYEGOKE B S,FOOTTIT F,BIRTWHISTLE D.Condition assessment of XLPE insulated cables using isothermal relaxation current technique[C]∥IEEE Power Engineering Society General Meeting.Quebec,Canada:IEEE,2006:477-480.
[5]HEIZMANN T,ZAENGL W S.Influence of ageing on depolarization currents in polymer-insulated medium-voltage cables[C]∥Conference on Electrical Insulation and Dielectric Phenomena.Zurich,Switzerland:CEIDP,1991:324-329.
[6]尹毅,屠德民,李明,等.用等温电流法研究自由基清除剂的作用机理-聚合物电老化陷阱理论的实验验证[J].中国电机工程学报,2000,20(3):13-15,25.YIN Yi,TU Demin,LI Ming,et al.Study on the action mechanism of the free radical scavenger with isothermal current decay method an experiment verification of trap theory for electrical aging in polymer[J].Proceedings of the CSEE,2000,20(3):13-15,25.
[7]王雅群,尹毅,李旭光,等.等温松弛电流用于10 kV XLPE电缆寿命评估的方法[J].电工技术学报,2009,24(9):33-37.WANG Yaqun,YIN Yi,LI Xuguang,et al.The method of lifetime evaluation on 10 kV XLPE cables by isothermal relaxation current[J].Transactions of China Electrotechnical Society,2009,24(9):33-37.
[8]高树国,朱永华,吴长顺,等.基于等温松弛电流法的XLPE绝缘电力电缆老化评估判据研究[J].电线电缆,2014,57(1):34-37.GAO Shuguo,ZHU Yonghua,WU Changshun,et al.Criterion of aging assessment for XLPE insulation power cable based on isothermal relaxation method[J].Electric Wire&Cable,2014,57(1):34-37.
[9]黄科荣,周凯,黄明,等.水树老化电缆的超低频介损不对称现象研究[J].绝缘材料,2018,51(9):36-40,47.HUANG Kerong,ZHOU Kai,HUANG Ming,et al.Study on asymmetrical phenomenon of ultra-low frequency dielectric loss of water tree aged cables[J].Insulating Materials,2018,51(9):36-40,47.
[10]黄昊,雷勇,颜嘉俊,等.交联聚乙烯中压电缆绝缘性能的检测和分析[J].中国电力,2014,47(2):73-77.HUANG Hao,LEI Yong,YAN Jiajun,et al.Insulation detection and analysis of XLPE medium-voltage cables[J].Electric Power,2014,47(2):73-77.
[11]刘刚,吴亮,金尚儿,等.基于电特性的110 kV交联聚乙烯电缆剩余寿命评估[J].高电压技术,2017,43(8):2718-2723.LIU Gang,WU Liang,JIN Shanger,et al.Assessment of 110 k VXLPE cables remaining life based on electrical characteristics[J].High Voltage Engineering,2017,43(8):2718-2723.
[12]刘刚,金尚儿,梁子鹏,等.基于等温松弛电流法和活化能法的110 k V XLPE电缆老化状态评估[J].高电压技术,2016,42(8):2372-2381.LIU Gang,JIN Shanger,LIANG Zipeng,et al.Aging state assessment of 110 kV XLPE cable based on isothermal relaxation current method and activation energy method[J].High Voltage Engineering,2016,42(8):2372-2381.
[13]杨帆,沈煜,王彦博,等.基于极化/去极化电流法的交联聚乙烯电缆热老化程度判定[J].高电压技术,2016,42(2):496-503.YANG Fan,SHEN Yu,WANG Yanbo,et al.Thermal aging status diagnosis of XLPE cable using polarization/depolarization current method[J].High Voltage Engineering,2016,42(2):496-503.
[14]郑建康,赵艾萱,林涛,等.高频冲击电压对XLPE电缆介电响应特性的影响[J].智慧电力,2018,46(5):46-52.ZHENG Jiankang,ZHAO Aixuan,LIN Tao,et al.Effect of high frequency impulse voltage upon dielectric response of XLPE cables[J].Smart Power,2018,46(5):46-52.
[15]董明,王丽,吴雪舟,等.油纸绝缘介电响应检测技术研究现状与发展[J].高电压技术,2016,42(4):1179-1189.DONG Ming,WANG Li,WU Xuezhou,et al.Status and progress in study of dielectric response technology for oil-paper insulation[J].High Voltage Engineering,2016,42(4):1179-1189.
[16]LEIBFRIED T,KACHLER A J.Insulation diagnostics on power transformers using the polarisation and depolarisation current(PDC)analysis[C]∥Conference Record of the 2002 IEEE International Symposium on Electrical Insulation.Boston,USA:IEEE,2002:170-173.
[17]SIMMONS J G,TAYLOR G W,TAM M C.Thermally stimulated currents in semiconductors and insulators having arbitrary trap distributions[J].Physical Review B,1973,7(8):3714-3719.
[18]BIRKNER P.Field experience with a condition-based maintenance program of 20 k V XLPE distribution system using IRC-analysis[J].IEEE Transactions on Power Delivery,2004,19(1):3-8.
[19]ALLAN R N AND BILLINTON R.Reliability evaluation of engineering system[M].New York,USA:Plenum Press,1992.
[20]俞大刚.线性回归模型分析[M].北京:中国统计出版社,1987.YU Dagang.Analysis of linear regression model[M].Beijing,China:China Statistics Press,1987.
[21]张尧庭.我们应该选用什么样的相关性指标[J].统计研究,2002,19(9):41-44.ZHANG Yaoting.What co-relative indicators should we employ[J].Statistical Research,2002,19(9):41-44.
[22]ZAR J.Spearman rank correlation[M].New York,USA:Encyclopedia of Biostatistics,2004.
[23]袁建文,李科研.关于样本量计算方法的比较研究[J].统计与决策,2013,32(1):22-25.YUAN Jianwen,LI Keyan.A comparative study of the method of calculating sample size[J].Statistics and Decision,2013,32(1):22-25.
[24]刘剑,张勇,杜志叶,等.交流输电线路设计中的全寿命周期成本敏感度分析[J].高电压技术,2010,36(6):1554-1559.LIU Jian,ZHANG Yong,DU Zhiye,et al.Life cycle cost sensitivity analysis in AC transmission lines design[J].High Voltage Engineering,2010,36(6):1554-1559.
[25]ANDERS G J,RADHAKRISHNA H S.Power cable thermal analysis with consideration of heat and moisture transfer in the soil[J].IEEETransactions on Power Delivery,1988,3(4):1280-1288.