Abstract
This paper describes the phenomenon of internal pressure-rise due to arcs that were ignited between the metal rod electrodes in the air. Firstly, the internal pressure-rises in a closed chamber due to arcs were measured with the current within the range of 1 to 12.5kA. The rod electrodes were made of copper, iron and aluminum, and 20mm in diameter. As a measured result, it was clarified that the maximum pressure-rise distinctly differed with each electrode material under the same total arc energy, namely, the maximum pressure-rise was the highest in the case of the aluminum electrode and was the lowest in the case of the iron electrode. Next, to quantitatively verify this difference, the internal pressure was estimated taking into account the energy balance in the closed chamber on each electrode material. As a result, it was clarified that the estimated value of the pressure-rise approximately agreed with the above experimental result by consideration of the oxidation reaction of electrodes, the melting and vaporization of electrodes and radiation loss of arcs under certain realistic assumptions.
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