油浸絶縁の直流極性反転時の過渡電界と絶縁強度の検討

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タイトル別名
  • Study on Transient Field Intensity and Dielectric Strength for DC Polarity Reversal Voltage in Oil-Immersed Insulation
  • ユシン ゼツエン ノ チョクリュウ キョクセイ ハンテンジ ノ カト デンカイ ト ゼツエン キョウド ノ ケントウ

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In the DC system, the DC converter transformer is subjected to the polarity reversal voltage, which induces the transient field intensity in the oil portion of the oil-immersed insulation system.<br> In the paper, the transient field intensity is discussed during the DC polarity reversal in the oil-immersed insulation system. The authors describe a calculation method of the transient field intensity, using the surface charge method. The estimation method of the dielectric breakdown field intensity is proposed for the DC polarity reversal voltage. The estimated breakdown field intensity is compared with measured one.<br> Based on the calculation method of the transient field intensity, authors also investigate the effects of temperature and polarity reversal time on the transient field intensity during the polarity reversal.

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