Waveform Analysis of Partial Discharge Current in Liquid Nitrogen Immersed Insulation

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  • 液体窒素浸漬絶縁の部分放電電流波形解析
  • エキタイ チッソ シンセキ ゼツエン ノ ブブン ホウデン デンリュウ ハケイ

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Abstract

This paper deals with the partial discharge measurement in liquid nitrogen immersed insulation using high frequency detection system.<br>AC voltage of 3-6kV were applied on a needle-plane electrode system in which a polyethylene terephthalate film was inserted. Partial discharge detection was carried out using a wide band current detection system that has a frequency range up to 250MHz. The magnitude and pulse width showed significant differences depending on the polarity of pulse current when the applied voltage was high.<br>Frequency analysis was done in both low and high frequency bands. It was found that the signal component within 150-250MHz had a correlation with the discharge mode. The signal component within 1-10MHz had a correlation with PD charge magnitude.<br>Based on the above results, the partial discharge measurement with high frequency range is suggested to be effective for the monitoring of discharge mode.

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