GIS内部に混入した金属異物の異物先端電界係数の提案とフラッシオーバ電圧の予測

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  • Proposal of New Electric-field Coefficient at Sharp Tip of Conducting Particle Mingled in GIS and Prediction of Flashover Voltage
  • GIS ナイブ ニ コンニュウシタ キンゾク イブツ ノ イブツ センタン デ

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In many high voltage gas insulated switchgears (GIS), the effects of conducting particles on breaking phenomena are very serious. Some methods have been proposed for flashover voltage prediction in compressed SF6 under alternating voltage condition, etc. In these methods, the flashover voltage is predicted by integrating an effective ionization coefficient near the tip of conducting particle. However, some assumptions are used to predict the flashover voltage under these methods.<br>In the present paper, a new method for flashover voltage prediction is proposed of a conducting particle with a sharp tip mingled in GIS. The tip of the particle often has only little corona stabilizing effect. It is the method for determination of new electric-field coefficient and new criterion proposed by the authors, which are named “Particle Tip Electric-field Coefficient” and “Flashover Criterion” respectively. A conducting particle in GIS is predicted to have no trouble, when the particle tip electric-field coefficient of the conducting particle is less than the flashover criterion previously obtained with an experiment. Flashover voltages of GIS including many kinds of conducting particles are determined by means of the proposed method. It can be seen that the proposed method is useful to predict the flashover voltage of GIS including conducting particles larger than 5mm length.

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