电工技术学报  2022, Vol. 37 Issue (6): 1542-1553    DOI: 10.19595/j.cnki.1000-6753.tces.201093
高电压与放电 |
高压频域介电谱诊断XLPE电缆局部绝缘老化缺陷的研究
王昊月1,2, 李成榕1,2, 王伟1,2, 王晓威1,2, 徐启龙1,2
1.华北电力大学北京市高电压与电磁兼容实验室 北京 102206;
2.新能源电力系统国家重点实验室(华北电力大学) 北京 102206
Local Aging Diagnosis of XLPE Cables Using High Voltage Frequency Domain Dielectric Spectroscopy
Wang Haoyue1,2, Li Chengrong1,2, Wang Wei1,2, Wang Xiaowei1,2, Xu Qilong1,2
1. Beijing Key Laboratory of High Voltage and Electromagnetic Compatibility North China Electric Power University Beijing 102206 China;
2. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China
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摘要 热老化和水树老化是导致交联聚乙烯(XLPE)电缆绝缘性能下降的重要原因,及时发现和处理热老化和水树老化缺陷,对于电缆安全运行具有重要意义。为了解决超低频(0.1Hz)介电损耗检测对电缆局部老化检测灵敏度不高、无法实现老化缺陷类型区分的问题,开展高压频域介电谱诊断XLPE电缆绝缘老化缺陷的研究。通过加速老化,制备了水树老化和热老化电缆线段,在不同电压等级下检测27.4m长10kV电缆局部老化前后的频域介电谱(0.01~0.1Hz),构造和分析介电谱曲线的分层度S和迟滞度D,并与超低频(0.1Hz)介电损耗检测的方法进行比较。研究结果表明,超低频难以发现局部热老化和70%贯通的局部水树老化缺陷,而高压频域介电谱对局部热老化和局部水树老化反应灵敏;局部热老化和局部水树老化缺陷试样的曲线分层度S均大于1,可作为电缆老化的判断依据;局部水树老化试样的曲线迟滞度D显著大于局部热老化试样,可以作为XLPE电缆局部热老化和局部水树老化区分的特征量。
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关键词 交联聚乙烯老化高压频域介电谱诊断    
Abstract:Water tree aging are important reasons for the degradation of XLPE cable insulation. The timely detection and treatment of those aging defects are of great significance for system operation safety. Although very-low frequency (VLF, 0.1Hz) dielectric loss detection is widely used for the cable aging detection, it has low sensitivity for local defects and cannot distinguish the aging defects types. In this paper, high voltage frequency-domain spectroscopy (FDS) is carried out to diagnose XLPE cable insulation aging defects. Through the accelerated aging experiment, the water tree aging and thermal aging defective cable segments are prepared. Then the high-voltage dielectric spectroscopy (0.01~0.1Hz) under different voltage levels is detected on the 27.4m long 10kV cable before and after local aging. The dielectric parameters, layering degree S and the hysteresis degree D of FDS curve, are defined and analyzed. The FDS results are also compared with the VLF (0.1Hz) dielectric loss detection. The results show that the VLF method is difficult to find local thermal aging and 70% water tree penetration defects, while the high-voltage FDS is sensitive to local thermal aging and local water tree aging defects. It is found that the layering degree S of thermal aging and water tree aging samples is greater than 1, which can be used as the criterion of cable aging; the hysteresis degree D of the water tree aging sample is significantly greater than that of the thermal aging sample, which can be used as a characteristic quantity to distinguish thermal aging and water tree aging of XLPE cables.
Key wordsCross-linked polyethylene    aging    high voltage frequency domain spectroscopy    diagnosis   
收稿日期: 2020-08-30     
PACS: TM835  
通讯作者: 王 伟 男,1979年生,副教授,研究方向为电气设备在线监测与诊断等。E-mail: ww790324@163.com   
作者简介: 王昊月 女,1993年生,博士研究生,研究方向为电力电缆故障检测及评估。E-mail: ncepu_why@ncepu.edu.cn
引用本文:   
王昊月, 李成榕, 王伟, 王晓威, 徐启龙. 高压频域介电谱诊断XLPE电缆局部绝缘老化缺陷的研究[J]. 电工技术学报, 2022, 37(6): 1542-1553. Wang Haoyue, Li Chengrong, Wang Wei, Wang Xiaowei, Xu Qilong. Local Aging Diagnosis of XLPE Cables Using High Voltage Frequency Domain Dielectric Spectroscopy. Transactions of China Electrotechnical Society, 2022, 37(6): 1542-1553.
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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.201093          https://dgjsxb.ces-transaction.com/CN/Y2022/V37/I6/1542