Electric Field Measurement at Partial Discharge Occurrence in Oil/Pressboard Insulation System

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  • 絶縁油／プレスボード複合絶縁系における部分放電発生時の電界測定
  • ゼツエンユ/プレスボード フクゴウ ゼツエンケイ ニ オケル ブブン ホウデン ハッセイジ ノ デンカイ ソクテイ

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<p>To investigate the breakdown mechanism in oil/PB composite insulation systems applied to power transformers, we have measured the electric field in partial discharge occurrence by the application of lightning impulse voltage using the electric field measurement system by electro-optical Kerr effect. It has confirmed that the system has sufficient time response for the measurement of the electric field during lightning impulse application. In the oil/PB composite insulation system, which has multi oil gaps, we could have confirmed the increase of the electric field of the other gaps when the partial discharge occurred in one of the oil gaps. Furthermore, we have confirmed that the obtained optical phase shift is similar to estimated value by electric field simulation.</p>

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