Comparisons of Direct-current Breakdown Characteristics in Dry Air and SF<sub>6</sub> Gaps using a Parallel-Plane Arrangement with a Variable-Height Protrusion

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  • 乾燥空気とSF<sub>6</sub>ガスの可動突起付平行平板ギャップにおける直流破壊特性の比較
  • 乾燥空気とSF6ガスの可動突起付平行平板ギャップにおける直流破壊特性の比較
  • カンソウ クウキ ト SF6 ガス ノ カドウ トッキツキ ヘイコウ ヘイバン
  • Comparisons of direct‐current breakdown characteristics in dry air and SF<sub>6</sub> gaps using a parallel‐plane arrangement with variable height protrusion

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Breakdown Voltages in uniform and quasi-uniform field gaps are sensitive to the presence of small protrusion on the electrode surface in SF6 at high pressures. The aim of the present work is to study direct breakdown and corona stabilized breakdown for the transitive region from uniform to non-uniform gap in Dry Air and SF6 at low pressures up to a critical pressure when direct breakdown takes place by a leader discharge acrossing the gap in SF6. In a parallel-plane gap with a variable-height protrusion subjected to the DC voltage, corona onset voltage is remarkably controlled by the protrusion height. The present electrode arrangement has the advantage of directly measuring the minimum critical guiding field strength for the propagation of a streamer discharge at corona onset.<br> The experimental observations have been explained qualitaively on the basis of a streamer model and precise electric field calculations of gap.

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