机械式高压直流真空断路器换流参数研究

doi:10.19595/j.cnki.1000-6753.tces.190670

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Abstract Mechanical high voltage direct current (HVDC) vacuum circuit breaker based on commutation principle is one of the solutions for short circuit failure interruption in HVDC system. After arc extinction, whether the medium recovery strength can withstand the recovery voltage is the key factor influencing the interrupting performance. Therefore, the commutation time and minimum safe stroke become important references for the design of mechanical HVDC vacuum circuit breaker. In this paper, at different initial moments of commutation time, interrupting current amplitudes, commutation frequencies and amplitude ratios of the commutation current to the interrupting current (commutation ratio), the commutation time and minimum safe stroke of DC vacuum circuit breaker were tested by a DC test circuit. The experimental results show that, if the initial moment of commutation time is too early, it may lead to insufficient gap distance between contacts and cause arc reigniting. When the commutation frequency is 3kHz and the interrupting current is 5kA, the minimum safe stroke is about 0.60mm. With the increase of the interrupting current amplitude, the minimum safe stroke increases approximately linearly. The higher the commutation frequency and the commutation ratio, the smaller the commutation time is. The minimum safe stroke is more demanding as the recovery voltage increases.

Key words： Mechanical HVDC vacuum circuit breaker commutation time commutation ratio minimum safe stroke

Received: 04 June 2019

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TM561

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	Articles by authors
	Zhang Ziying
	Liang Deshi
	Cai Miaozhong
	Zou Jiyan
	Liu Ruitong

Cite this article:

Zhang Ziying,Liang Deshi,Cai Miaozhong等. Research on Commutation Parameters of Mechanical HVDC Vacuum Circuit Breaker[J]. Transactions of China Electrotechnical Society, 2020, 35(12): 2554-2561.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.190670 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I12/2554

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