遮断器内アーク放電のパラメータの簡易復元と変動についての研究

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  • Study on the simple identification and the variation of the parameters of the are discharge in a circuit breaker
  • シャダンキ ナイ アーク ホウデン ノ パラメータ ノ カンイ フクゲン ト ヘンドウ ニ ツイテ ノ ケンキュウ

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The aim of this paper is to evaluate the current breaking performance of a circuit breaker through simulation of the dynamic characteristics of its arc discharge, whose parameters were measured beforehand. Here the general arc model is taken as the fundamental. Recently, the time constant of the arc model has been considered to be variable, and there are two theories that describe the behavior of the parameter variation. One theory asserts that the time constant should vary as the function of the steady state arc conductance for the current at that instant, but the other asserts the function of the instantaneous arc conductance. It is necessary to discuss which assertion is true or better. It has been inspected firstly through numerical calculation and also the method for identifying the time constant from the experimental result has been discussed and developed. It is revealed that the results from both theories were of less difference for predicting the performance of an arc discharge through simulation, and they were applied in parallel afterward. In the latter part of the paper, the experimental results of three reported cases have been analyzed through the identification of their arc parameters. It is revealed that the time constant of the arc discharge may be an increasing function or a decreasing function concerning the variation of the arc conductance, depending on the types of the arc discharge. The behavior of arc discharge can be described well in concern with its cooling mechanism. It is verified that both theories can be applied to achieve the aim of the paper, and the behavior of the arc time constant has been revealed for the first time.

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