Simulation and Failure Analysis of 500kV SF6 Porcelain Bushing under Complicated Working Conditions
Zhao Jianli1, Yao Shun2, Yue Yonggang3,4, Yao Shuhua1, Yang Lanjun4
1. Inner Mongolia Power (Group) Co. Ltd Inner Mongolia Power Research Institute Branch Hohhot 010020 China; 2. Inner Mongolia Power (Group) Co. Ltd Hohhot 010020 China; 3. Inner Mongolia Extra High Voltage Power Supply Corporation Hohhot 010012 China; 4. College of Electrical Engineering Xi’an Jiaotong University Xi’an 710048 China
Abstract：Explosive failure of high voltage porcelain bushings with SF6 gas is a great threaten to the safe operation of the power system as well as to the security of the neighboring staff and apparatus. Recently, this kind of failure has been reported to occur several times but the reason has not been thoroughly worked out. Thus the operation of the bushing considering various possible occasions under different working conditions requires further investigation. In this paper, the simulation of electric and thermal distribution for the 500kV porcelain bushing with SF6 has been done. During the simulation process, the influence of many factors on the gas insulation characteristics inside the bushing is considered, which includes the interior temperature distribution, low temperature liquefaction of SF6 gas and external insulation factors such as pollution, rain and snow. The simulation result shows that the temperature distribution as well as external insulation factors such as the pollution and the environment has minor effect on the internal electric field in the bushing. But the liquidation of the SF6 on the inner wall of the bushing greatly enhances the maximum field strength and may result in insulation failure under specific working condition.
赵建利, 姚顺, 岳永刚, 姚树华, 杨兰均. 500kV SF6瓷质套管多工况仿真与故障分析[J]. 电工技术学报, 2021, 36(zk2): 736-745.
Zhao Jianli, Yao Shun, Yue Yonggang, Yao Shuhua, Yang Lanjun. Simulation and Failure Analysis of 500kV SF6 Porcelain Bushing under Complicated Working Conditions. Transactions of China Electrotechnical Society, 2021, 36(zk2): 736-745.
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2021, Vol. 36 
