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| Failure analysis of partial discharge of coaxial cable |
| Wu Ke, Qiao Yunsong, Xiong Gang, Yin Yecheng, Wang Dong |
| State Grid Chongqing Electric Power Company Maintenance Branch, Chongqing 400039 |
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Abstract The The proportion of high-voltage cable lines in the urban power supply system is increasing, but the abnormality of the cross-connected system will cause the line to be put into operation. In this paper, the discharge fault of a coaxial cable at 110kV XLPE high-voltage cable insulation joint is analyzed. The cause of the fault is that the semi-conducting layer of the coaxial cable is not stripped at the insulation joint, forming a semi-conductive tip and local electric field distortion. At the same time, the insulation resistance between the inner and outer conductors is greatly reduced, and the ablation damage of the partial discharge is accelerated, eventually leading to ablation breakdown of the coaxial cable. For this reason, the specific requirements and improvement measures for the construction process of the coaxial cable of the grounding system are put forward, which is of great significance for improving the power supply reliability of the cable line.
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Received: 11 November 2019
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2020, Vol. 21 
