Study of Flashover Characteristics over The Surface of Insulator in SF6 Gas

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  • SF<sub>6</sub>ガス中絶縁物沿面のフラッシオーバ特性の検討
  • SF6ガス中絶縁物沿面のフラッシオーバ特性の検討
  • SF6 ガスチュウ ゼツエンブツ エンメン ノ フラッシオーバ トクセイ ノ

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Abstract

This paper investigates the insulator surface flashover characteristics in SF6 gas by applying lightning impulse. It especially discusses on the surface flashover characteristics of discharge patterns originating from an insulating surface as compared with the discharge pattern originating from one electrode attached to the insulator.<br> The origins of both patterns of discharge are points with a maximum electric field strength over an insulator surface and an electrode surface. The flashover electric field strength over the insulator surface is lower than that on electrode surface coated with insulation material, and, the dispertion of flashover voltages of insulator surface discharge is greater than that of electrode discharge. Thus there is a difference between the flashover characteristics of insulator surface discharge and electrode discharge and it seems that the variations of the surface conditions of insulators have some effect on them.<br> Therefore, in the insulation design for insulator surfaces in gas insulated switchgear (GIS), it is necessary to ensure reliability with some tolerance added over the electric field strength of the gas gaps.

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