絶縁物中の非貫通微小間隙内を進展する交流部分放電

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  • AC Partial Discharges Propagating into an Unpenetrated Crack in an Insulator
  • ゼツエンブツ チュウ ノ ヒカンツウ ビショウ カンゲキ ナイ オ シンテン スル コウリュウ ブブン ホウデン

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A test insulator with unpenetrated crack was constructed from two insulating blocks on an insulating board: Inner walls of the crack were formed by the surfaces of two blocks. The test insulator with the crack was set in a needle-plane electrode system. When ac (50Hz) high voltage is applied between the electrodes, PD generates from the needle electrode propagating through the crack, and its propagation is restricted at the dead end of the crack. The material of the blocks is PMMA. The crack width (s) ranged from 10µm to 1000µm. The experiments were performed in air controlled at 20-25°C and 40-50%RH. The experimental results show that the magnitude of positive pulse due to ac PD depends on the width of the crack. The maximum magnitude of positive pulse in the area of the width 10µm<s<200µm (narrow area) is 2 times larger than that in the area of width 500µm<s<1000µm (wide area); The larger magnitude of positive pulse >2×10-8C is observed only in the narrow area. It appears every 3-4 cycles of applied ac. The generation mechanism of the large magnitude of the pulse is discussed focusing on the charge accumulation on the insulating wall in the crack. The dust-figure suggests that the positive accumulated charge on the wall in the narrow area of width restricts the propagation of positive PD along the insulating wall of the crack. The positive pulse of large magnitude may be generated just after the cycle of negative PD where the accumulated positive charge is largely neutralized by the negative PD.

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