Calculation Method of Gas-Pressure Rising Process in Puffer Chamber of High-Voltage SF<sub>6</sub> Circuit-Breaker

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  • SF<sub>6</sub>ガス遮断器のアーク遮断過程におけるパッファ室ガス圧力上昇の計算手法
  • SF₆ガス遮断器のアーク遮断過程におけるパッファ室ガス圧力上昇の計算手法 : ノズルアブレーション蒸気による加圧効果
  • SF ₆ ガス シャダンキ ノ アーク シャダン カテイ ニ オケル パッファシツガス アツリョク ジョウショウ ノ ケイサン シュホウ : ノズルアブレーション ジョウキ ニ ヨル カアツ コウカ
  • — Effect of Nozzle Ablation Vapor on Gas Pressure Rise—
  • —ノズルアブレーション蒸気による加圧効果—

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Abstract

<p>Regarding a PTFE (Polytetrafluoroethylene) nozzle ablation due to arc radiation exposure in SF6 circuit-breaker, the ablated mass of the nozzle was formulated as a function of an arc current and an internal radius of the nozzle surface considering the radiation power absorbed on the surface. Furthermore, this formulation contributed to subsequent development of calculation method for evaluating gas pressure rise process during current interruption. And, verification experiments of the calculation method were performed with a model SF6 circuit-breaker equipped a puffer chamber. Calculation results derived from the developed calculation method showed good agreement with measured gas pressure rise process. On the basis of the verified results, a discussion was made to explain pressure rise mechanism.</p>

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