Effect of Low Temperature on Interface Discharge Characteristics of Ethylene-Propylene Rubber Cable Termination in High-Cold Environment
Bai Longlei1, Zhou Lijun1, Xing Limeng1, Li Lini1, Xiang Enxin2
1. School of Electrical Engineering Southwest Jiaotong University Chengdu 611756 China; 2. Yunnan Electric Power Research Institute Yunnan Power Grid Co. Ltd Kunming 650217 China
Abstract：Ethylene-propylene rubber (EPR) cable is the most widely used type in high-speed trains. Several flashover accidents occurred at the cable termination in high altitude and high cold environment. In order to examine the effect of low-temperature on the partial discharge (PD) characteristics of EPR cable termination, a low temperature test system capable of simulating the lowest temperature up to-50°C was established. During the test, EPR cable termination was taken as the test sample, and a comparative study of the PD characteristics and material properties of termination insulation in the range of 20~-40°C was carried out. The results showed that the difference of elastic modulus and free space volume between EPR insulation and stress control tube(SCT) in high altitude and high cold environment led to structural defects between them, which induced the appearance of PD phenomenon inside EPR cable termination. In addition, the PD initial voltage(PDIV) and PD extinction voltage(PDEV) under low-temperature conditions also reduced by more than 40% compared with that at 20°C. At the same time, the breakdown probability of EPR terminations increased significantly, and the shape characteristics of PD patterns have obvious changes at low-temperature. It is verified by experiments that under the high-voltage and low-temperature conditions, the EPR/SCT interface of the termination is prone to structural mismatch, which will lead to the PD phenomenon and seriously threatens the safe and stable operation of EPR cable terminations.
白龙雷, 周利军, 邢立勐, 李丽妮, 项恩新. 高寒环境下低温对乙丙橡胶电缆终端界面放电特性的影响[J]. 电工技术学报, 2020, 35(3): 646-658.
Bai Longlei, Zhou Lijun, Xing Limeng, Li Lini, Xiang Enxin. Effect of Low Temperature on Interface Discharge Characteristics of Ethylene-Propylene Rubber Cable Termination in High-Cold Environment. Transactions of China Electrotechnical Society, 2020, 35(3): 646-658.
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2020, Vol. 35 
