介电谱用于评估XLPE电缆绝缘劣化状态的研究
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摘要
电缆绝缘的介电性能与其劣化状态密切相关,本研究采用一种新的介电分析方法通过介电谱评估XLPE电缆绝缘的劣化状态,该方法通过对介电常数实部频谱进行数学变换获得新的谱图。首先在130℃下对XLPE电缆绝缘进行不同时间的加速老化实验,获得不同劣化程度的XLPE试样,然后用新的介电分析方法评估这些试样的劣化状态,并采用傅里叶变换红外光谱(FTIR)表征其化学结构的变化。结果表明:新谱图中损耗峰的峰值频率能够表征电缆绝缘的劣化状态,峰值频率越低,劣化程度越严重。同时,羰基峰的出现表明XLPE的化学结构发生了变化,损耗峰峰值频率的变化与此相关。
The dielectric properties of cable insulation are closely related to its deterioration condition. In this paper, the deterioration condition of XLPE cable insulation was evaluated using a new method by dielectric spectroscopy, and the new spectra were obtained by mathematical transformation on frequency spectra of the real part of permittivity. At first, XLPE cable insulation were accelerated aged for different time at 130 ℃ to obtain samples with different degree of deterioration. Then their deterioration condition was evaluated by the new dielectric analytical method, and their chemical structure was characterized by Fourier transform infrared spectroscopy(FTIR). The results show that the deterioration condition of XLPE cable insulation can be evaluated by the peak frequency in the new spectrum, and the lower the peak frequency, the worse the deterioration degree. Meanwhile, the presence of carbonyl peak indicates the variation of chemical structure of XLPE, which is related to the variation of peak frequency.
The dielectric properties of cable insulation are closely related to its deterioration condition. In this paper, the deterioration condition of XLPE cable insulation was evaluated using a new method by dielectric spectroscopy, and the new spectra were obtained by mathematical transformation on frequency spectra of the real part of permittivity. At first, XLPE cable insulation were accelerated aged for different time at 130 ℃ to obtain samples with different degree of deterioration. Then their deterioration condition was evaluated by the new dielectric analytical method, and their chemical structure was characterized by Fourier transform infrared spectroscopy(FTIR). The results show that the deterioration condition of XLPE cable insulation can be evaluated by the peak frequency in the new spectrum, and the lower the peak frequency, the worse the deterioration degree. Meanwhile, the presence of carbonyl peak indicates the variation of chemical structure of XLPE, which is related to the variation of peak frequency.
引文
[1] LI Jianying, LI Huan, WANG Qimeng, et al. Accelerated inhomogeneous degradation of XLPE insulation caused by copper-rich impurities at elevated temperature[J]. IEEE Transactions on Dielectrics and Electrical Insulation,2016,23(3):1789-1797.
[2] XU Yang, LUO Pan, XU Man, et al. Investigation on insulation material morphological structure of 110 and 220kV XLPE retired cables for reusing[J]. IEEE Transactions on Dielectrics and Electrical Insulation,2014,21(4):1687-1696.
[3] LI Weiwei, LI Jianying, YIN Guilai, et al. Frequency dependence of breakdown performance of XLPE with different artificial defects[J]. IEEE Transactions on Dielectrics and Electrical Insulation,2012,19(4):1351-1359.
[4]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.
[5]钟世云.聚合物降解与稳定化[M].北京:化学工业出版社,2002.
[6]李欢,李建英,马永翔,等.不同温度热老化条件下交联聚乙烯电缆绝缘热性能和力学性能的劣化趋势研究[J].绝缘材料,2018,51(1):57-63.
[7] HE Dongxin, GU Jiefeng, WANG Wei, et al. Research on mechanical and dielectric properties of XLPE cable under accelerated electrical-thermal aging[J]. Polymers for Advanced Technologies,2016,28(8):1020-1029.
[8]李欢,李建英,马永翔,等.不同温度热老化对XLPE电缆绝缘材料晶体结构的影响研究[J].中国电机工程学报,2017,37(22):6740-6748.
[9]刘韬,朱斌,张涛,等.基于压痕模量的电缆老化状态检测系统的开发[J].绝缘材料,2015,48(6):54-57.
[10] ANDJELKOVIC D, RAJAKOVIC N. Influence of accelerated aging on mechanical and structural properties of cross-linked polyethylene(XLPE)insulation[J]. Electrical Engineering,2001,83(1-2):83-87.
[11] FOTHERGILL J C, DODD S J, DISSADO L A, et al.The measurement of very low conductivity and dielectric loss in XLPE cables:A possible method to detect degradation due to thermal aging[J]. IEEE Transactions on Dielectrics and Electrical Insulation,2011,18(5):1544-1553.
[12]刘英,王林杰,苏宇,等.基于0.1Hz下tanδ的XLPE电缆绝缘老化状态评估技术[J].绝缘材料,2016,49(5):41-45.
[13] MECHERI Y, BOUKEZZZI L, BOUBAKEUR A, et al. Dielectric and mechanical behavior of cross-linked polyethylene under thermal aging[C]//2000 Report Conference on Electrical Insulation and Dielectric Phenomena. Victoria,Canada:IEEE,2000(2):560-563.
[14] KIM C, JIN Zhijian, JIANG Pingkai, et al. Investigation of dielectric behavior of thermally aged XLPE cable in the high-frequency range[J]. Polymer Testing,2006,25(4):553-561.
[15]廖瑞金,刘捷丰,杨丽君,等.电力变压器油纸绝缘状态评估的频域介电特征参量研究[J].电工技术学报,2015,30(6):247-254.
[16]金维芳.电介质物理学[M].北京:机械工业出版社,1997.
[17] WU Kangning, HUANG Yuwei, LI Jianying, et al. Space charge polarization modulated instability of low frequency permittivity in CaCu3Ti4O12ceramics[J]. Applied Physics Letters,2017,111(4):217-220.
[18] MEDJDOUB A, BOUBAKEUR A, LEBEY T. Broad band dielectric investigation of cross-linked polyethylene use as electrical insulation on underground power cables[C]//Electrical Insulation and Dielectric Phenomena. West Lafayette,USA:IEEE,2010:1-4.
[19]耿蒲龙,杜亚昆,宋建成,等.温度和频率对XLPE电缆泄漏电流的影响[J].绝缘材料,2017,50(10):65-71.
[20] BOHNING M, GOERING H, ANDREAS F, et al. Dielectric study of molecular mobility in poly(propylene-graft-maleic anhydride)/clay nanocomposites[J]. Macromolecules,2005,38(7):2764-2774.
[21] ZHANG Chao, STENENS G C. The Dielectric response of polar and non-polar nanodielectrics[J]. IEEE Transactions on Dielectrics and Electrical Insulation,2008,15(2):606-617.
[22] WANG Weiwang, LI Shengtao, YU Shihu. Dielectric response characteristics of low density polyethylene/TiO2nanocomposites[C]//2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena. Shenzhen,China:IEEE,2013:726-729.
[23]张运周,冯冰,李明,等.退役110kV XLPE电缆绝缘材料聚集态结构分析[J].绝缘材料,2016,49(7):20-26.
[2] XU Yang, LUO Pan, XU Man, et al. Investigation on insulation material morphological structure of 110 and 220kV XLPE retired cables for reusing[J]. IEEE Transactions on Dielectrics and Electrical Insulation,2014,21(4):1687-1696.
[3] LI Weiwei, LI Jianying, YIN Guilai, et al. Frequency dependence of breakdown performance of XLPE with different artificial defects[J]. IEEE Transactions on Dielectrics and Electrical Insulation,2012,19(4):1351-1359.
[4]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.
[5]钟世云.聚合物降解与稳定化[M].北京:化学工业出版社,2002.
[6]李欢,李建英,马永翔,等.不同温度热老化条件下交联聚乙烯电缆绝缘热性能和力学性能的劣化趋势研究[J].绝缘材料,2018,51(1):57-63.
[7] HE Dongxin, GU Jiefeng, WANG Wei, et al. Research on mechanical and dielectric properties of XLPE cable under accelerated electrical-thermal aging[J]. Polymers for Advanced Technologies,2016,28(8):1020-1029.
[8]李欢,李建英,马永翔,等.不同温度热老化对XLPE电缆绝缘材料晶体结构的影响研究[J].中国电机工程学报,2017,37(22):6740-6748.
[9]刘韬,朱斌,张涛,等.基于压痕模量的电缆老化状态检测系统的开发[J].绝缘材料,2015,48(6):54-57.
[10] ANDJELKOVIC D, RAJAKOVIC N. Influence of accelerated aging on mechanical and structural properties of cross-linked polyethylene(XLPE)insulation[J]. Electrical Engineering,2001,83(1-2):83-87.
[11] FOTHERGILL J C, DODD S J, DISSADO L A, et al.The measurement of very low conductivity and dielectric loss in XLPE cables:A possible method to detect degradation due to thermal aging[J]. IEEE Transactions on Dielectrics and Electrical Insulation,2011,18(5):1544-1553.
[12]刘英,王林杰,苏宇,等.基于0.1Hz下tanδ的XLPE电缆绝缘老化状态评估技术[J].绝缘材料,2016,49(5):41-45.
[13] MECHERI Y, BOUKEZZZI L, BOUBAKEUR A, et al. Dielectric and mechanical behavior of cross-linked polyethylene under thermal aging[C]//2000 Report Conference on Electrical Insulation and Dielectric Phenomena. Victoria,Canada:IEEE,2000(2):560-563.
[14] KIM C, JIN Zhijian, JIANG Pingkai, et al. Investigation of dielectric behavior of thermally aged XLPE cable in the high-frequency range[J]. Polymer Testing,2006,25(4):553-561.
[15]廖瑞金,刘捷丰,杨丽君,等.电力变压器油纸绝缘状态评估的频域介电特征参量研究[J].电工技术学报,2015,30(6):247-254.
[16]金维芳.电介质物理学[M].北京:机械工业出版社,1997.
[17] WU Kangning, HUANG Yuwei, LI Jianying, et al. Space charge polarization modulated instability of low frequency permittivity in CaCu3Ti4O12ceramics[J]. Applied Physics Letters,2017,111(4):217-220.
[18] MEDJDOUB A, BOUBAKEUR A, LEBEY T. Broad band dielectric investigation of cross-linked polyethylene use as electrical insulation on underground power cables[C]//Electrical Insulation and Dielectric Phenomena. West Lafayette,USA:IEEE,2010:1-4.
[19]耿蒲龙,杜亚昆,宋建成,等.温度和频率对XLPE电缆泄漏电流的影响[J].绝缘材料,2017,50(10):65-71.
[20] BOHNING M, GOERING H, ANDREAS F, et al. Dielectric study of molecular mobility in poly(propylene-graft-maleic anhydride)/clay nanocomposites[J]. Macromolecules,2005,38(7):2764-2774.
[21] ZHANG Chao, STENENS G C. The Dielectric response of polar and non-polar nanodielectrics[J]. IEEE Transactions on Dielectrics and Electrical Insulation,2008,15(2):606-617.
[22] WANG Weiwang, LI Shengtao, YU Shihu. Dielectric response characteristics of low density polyethylene/TiO2nanocomposites[C]//2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena. Shenzhen,China:IEEE,2013:726-729.
[23]张运周,冯冰,李明,等.退役110kV XLPE电缆绝缘材料聚集态结构分析[J].绝缘材料,2016,49(7):20-26.