Effect of Arcing Time upon the Interruption Characteristic of the Hybrid DC Vacuum Circuit Breaker
Liu Luhui1, Zhuang Jinwu2, Wang Chen2, iang Zhuangxian2
1. National Key Laboratory of Science and Technology on Vessel Integrated Power System Wuhan 430033 China; 2. Naval University of Engineering Wuhan 430033 China
Abstract Based on forced commutation principle, the influences of arcing time on the interruption characteristics of DC 2~5kA is studied, using diameter 45mm CuCr50 butt contacts in a demountable vacuum chamber. The interruption process was taken down by high-speed photography. Experiment results show that the arc is initiated with either one arc column or two arc columns burning in parallel at the instant of contact separation. For arcing time<2ms, the arc expands while retaining its appearance as the counter current was injected. If there is one arc column, the arcing surface is less than the electrode’s surface and the reignition points are always the rupture points. If there are two arc columns, the arcing area increases and the interruption capability improves. For arcing time>2.5ms, arc spreads fully and coveres the whole contact, and the reignition distribution is random. Prior studies on the development of vacuum arc modes are discussed, and it is concluded the transversal magnetic field electrodes are suitable for DC current interruption.
Liu Luhui,Zhuang Jinwu,Wang Chen等. Effect of Arcing Time upon the Interruption Characteristic of the Hybrid DC Vacuum Circuit Breaker[J]. Transactions of China Electrotechnical Society, 2015, 30(24): 55-60.
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2015, Vol. 30 
