Recently, demand for DC circuit breaker is increasing and in particular DCCB with VCB attracts much attention. In this paper, DC current interruption test by injection of high frequency current is performed in order to evaluate current interruption characteristics. In addition, we adopted the model where the A value, the product of the residual plasma and the slope of current at current zero point, determines whether the interruption will succeed or not. From the probability processing, it turned out that the interruption performance was good in order of Cu:Cr =8:2 electrode, pure copper electrode, and Cu:Cr =5:5 electrode.
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