アークによる内部圧力上昇における電流波形および発弧位置依存性

概要

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This paper describes an experimental study concerning the pressure-rise due to the high current arcs in a closed chamber. In this study, the arcs were ignited in certain chambers of varying size under the same conditions, namely, the arc current of 12.5kA and the arc duration of 0.1s. Moreover, the pressure-rises in the chambers were measured with changing the current waveform, namely, the frequency of the AC power source and the DC component of the current, and the ignition position. Based on each measured waveform of them, not only the maximum value ΔPmax but also the middle value ΔPmid, which was a middle of the amplitude around the time point of ΔPmax, were extracted. As a result of the evaluation using both ΔPmax and ΔPmid, it was clarified that ΔPmax/ΔPmid varied with both the current waveform and the ignition position, whereas ΔPmid was independent of them. Through FFT analysis of both the pressure-rise and the arc power waveforms, it was verified that this experimental result was related to the resonance effect between the pressure-rise and the arc power oscillations.