Diagnosing Method for Water Tree Aging on XLPE Cable Based on Continuous PDC Test Method

被引:0
作者
Lin S. [1 ]
Zhou K. [1 ]
Yin Y. [1 ]
Li M. [2 ]
Gong W. [1 ]
机构
[1] College of Electricwsal Engineering, Sichuan University, Chengdu
[2] Skill Training Center of Sichuan Electric Power Company of State Grid, Chengdu
来源
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2020年 / 40卷 / 20期
基金
中国国家自然科学基金;
关键词
Creep property; Polarization and depolarization current method; Water tree aging; XLPE cable;
D O I
10.13334/j.0258-8013.pcsee.200954
中图分类号
学科分类号
摘要
To recognize the XLPE cable with water tree, this paper presented a diagnosing method based on the continuous polarization and depolarization current (PDC) tests. The microstructure and mechanical creep property of water trees were utilized in this method. Firstly, the current through the water tree region will gradually increase during the continuous PDC tests due to the deformation caused by the Maxwell stress. Then a simulation of water tree region was performed to verify the increase in current. Finally, the cable samples with different aging forms (water tree aging, thermal aging and irradiated aging) were tested by continuous PDC tests and the change of conductivity was analyzed. The results indicate that the cable samples with water tree aging show a significant increase in conductivity with the increase in number of PDC tests. The average length of water tree was related to the conductivity. The longer the length of the water tree branch inside the sample, the more the conductivity increased. The conductivity of samples without water tree aging hardly changed during the test. This method can determine whether there are water trees in a XLPE cable by continuous PDC tests and analyzing the changes in its conductivity. © 2020 Chin. Soc. for Elec. Eng.
引用
收藏
页码:6764 / 6772
页数:8
相关论文
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