Influence of Surface Shape on DC surface Breakdown Characteristics under Metallic-Particle Contaminated Conditions in SF<sub>6</sub> Gas

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  • SF<sub>6</sub>ガス中の金属粒子汚損直流沿面フラッシオーバに対する沿面形状の影響
  • SF6ガス中の金属粒子汚損直流沿面フラッシオーバに対する沿面形状の影響
  • SF6 ガスチュウ ノ キンゾク リュウシ オソン チョクリュウ エンメン フ

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Abstract

The influence due to metallic-particle attached on the supporting insulator is remarkable in the decreasing of dielectric strength in SF6 insulated apparatus. In relation with this problem, the authors have conducted a series of studies on improvement method for particle initiated breakdown performance.<br> In this work, DC breakdown voltage characteristics and breakdown mechanism are investigated under metallic-particle contaminated conditions in SF6 gas by varying the particle condition and surface shape of acrylic-plate with a rod-plane electrode. The main results show that a rib increases breakdown voltage by a corona stabilization effect and the elongation of discharge path but a groove decreases drastically its effect at lower gas pressures. The breakdown voltage at higher pressures than 4 atm may be estimated on the basis of discharge maintaining field and discharge length which depend on gas pressure and surface shape.

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