PD Characteristics and Their Luminescence in Air Gap in Series with Interface between Solid Insulation Materials at Various Applied Voltages

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  • 固体絶縁物の界面空隙に連なる空気ギャップにおける部分放電の電圧依存性と部分放電光の観測
  • コタイ ゼツエンブツ ノ カイメン クウゲキ ニ ツラナル クウキ ギャップ ニ オケル ブブン ホウデン ノ デンアツ イゾンセイ ト ブブン ホウ デンコウ ノ カンソク

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Abstract

In this paper, we studied the ac partial discharge (PD) characteristics and their luminescence patterns in air gap in series with fissure-like interface. The interface was formed by attaching two solid insulating blocks of epoxy resin and it was put between needle-plate electrodes and a small air gap. The PD characteristics were measured with a pulse method using a computer aided PD analyzing system and their luminescence was recorded to the photographs simultaneously.<br>PD and its luminescence were observed to occur from the tip of the needle electrode and its magnitude showed a good relation to the luminescence. In case of the nominal interfacial gap of 0μm (without spacer) the luminescence patterns of the specimen with a smooth interface show that the extension of PD streamers into the interface is restricted even at higher voltage and the roughened interface allowed especially for the positive PD streamers to crawl along the interface with increase of the applied voltage. When the interfacial gap became large, however, the growth of PD streamers crawling along the smooth interface became conspicuous than that along a roughened interface. These results indicate that the roughened surface has two opposite effects, one to supply interfacial space for the PD streamers to crawl along the interface in case of small interfacial gap and other to become the restraint factor for PD streamer crawling along the interface in case of larger interfacial gap.

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