各種混合ガス中の部分放電特性及び絶縁破壊特性

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タイトル別名
  • Partial Discharge and Breakdown Characteristics in Different Gas Mixtures
  • カクシュ コンゴウ ガス チュウ ノ ブブン ホウデン トクセイ オヨビ ゼツ

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SF6 gas is the most commonly used for insulating gas in the electric power apparatus like GIS, because of its superior dielectrics properties. On the other hand, it is said that the breakdown characteristics in SF6gas under nonuniform electric field is extremely susceptible leading to be lower breakdown voltage. Thus, it is needed to develop the alternate dielectric gas and gas mixture having better insulating characteristics.<br> This paper describes the characteristics of partial discharge inception and breakdown strength of gas mixtures in order to substitute pure SF6 gas. As a result, we made it clear that the inception characteristics of the partial discharge in SF6/N2, SF6/CO2, and SF6/CF4 gas mixture show small dependency of mixture rate of SF6 gas, however the breakdown voltages show the significant influence of SF6 mixture rate. This means that the PDIV characteristics mainly depend on the gas having lower PDIV properties, but the breakdown characteristics strongly depend on the PD behavior, that is, the corona stabilizing characteristics. Then, only 1% of SF6 mixture drastically enhances the breakdown voltage of N2, CO2, and CF4 gases. These results show that the N2 based SF6 gas mixture will be one of the substitute candidate of SF6 gas for H.V. power apparatus insulation.

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