500kV SF<sub>6</sub>瓷质套管多工况仿真与故障分析

doi:10.19595/j.cnki.1000-6753.tces.L90005

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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.

Key words： Porcelain bushing failure analysis under various working condition SF₆ liquidation E-field simulation

Received: 09 April 2020

PACS:	TM216
	TM15

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	Zhao Jianli
	Yao Shun
	Yue Yonggang
	Yao Shuhua
	Yang Lanjun

Cite this article:

Zhao Jianli,Yao Shun,Yue Yonggang等. Simulation and Failure Analysis of 500kV SF₆ Porcelain Bushing under Complicated Working Conditions[J]. Transactions of China Electrotechnical Society, 2021, 36(zk2): 736-745.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.L90005 OR https://dgjsxb.ces-transaction.com/EN/Y2021/V36/Izk2/736

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