アークにより消弧チューブから発生する分解ガス圧力の測定

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  • Pressure Measurements of Gas Ejected from a Fiber Tube under the Heat of the Arc
  • アーク ニ ヨリ ショウコ チューブ カラ ハッセイスル ブンカイ ガス アツ

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In our country, a lot of high voltage cut-outs are commonly installed in front of the distribution pole transformers. The load-switch in the arc extinguish chamber and the expulsion-fuse are assembled into the h. v. cut-out. The switch and the expulsion-fuse have share the operation in such a way that the switch afford load operation, and the expulsion-fuse give over-current and short circuit operation. It is reported that the breaking-process of the large current in the expulsion-fuse is associated with the considerably high arc voltage and the post-arc current.<br> In order to have the fundamental understanding of the physical phenomena of the breakingprocess in the expulsion-fuse, the experiments were made with the model of the cut-out and the expulsion-fuse. The discharge tube is installed at the one end of a fibre tube and the chamber is installed at the other end. A part of decomposed gas ejected from a fibre tube heated by the arc is discharged into the discharge tube and the remain flows into the chamber. The pressure of the discharge tube and the chamber was measured with the pressure sensor of diaphragmsemiconductor type.<br> A series of tests were made on many different dimensions of fibre tubes and various values of arc-ignition current and arc energy. The paper gives the measuring results for cut-off current versus the maximum pressure of the region of shock wave and foward running wave characteristics, arc energy versus the maximum pressure of the region of the ejected gas flow characteristics in the discharge tube, the characteristics of the arc energy versus the maximum pressure in the chamber, consumed mass of the tube versus arc energy characteristics, and so on. The paper also gives the estimation of the pressure for the ends of the tube, pressure distribution and gas flow in the tube related to the pressure in the chamber.

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