電力ケーブルの水トリー劣化診断のための残留電荷法に関連する空間電荷挙動 Study on Space Charge Behavior Related to the Residual Charge Method for Diagnosing Water Tree Degradation of Polymer Insulated Power Cables

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The residual charge method is expected to be a powerful tool to detect the water tree degradation of polymer insulated power cables. In this method, DC voltage is firstly applied to electrify the degraded region. Some of the charges would be deeply trapped and stayed stably, even after the DC voltage is removed and the system is short circuited. AC voltage is subsequently applied in order to release the trapped charges. The DC component current, or the integration of it, is considered to have a correlation with the degree of degradation. This paper discusses the detail of the mechanism by which the DC component signal appears. The specimen was carefully prepared so that it contained water trees with uniform length. Space charge measurement was performed by pulsed electroacoustic method. The decay process of charges under AC voltages was interpreted into the energy depth at which the charge had been trapped, assuming that the charges were detrapped by the process of Poole-Frenkel type. It was suggested that the charges trapped between 0.8-1.2 eV can be detected as the DC component current. The shallower would be released by thermal energy at ambient temperature while the system was short circuited. The deeper would not be released by realistic AC voltages. The result showed that the transition of DC component current in the residual charge method represents the behavior of space charges having been trapped at deferent energy levels. It is believed that the results give useful information to apply the method to power cables.

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  • 電気学会論文誌. A, 基礎・材料・共通部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A, A publication of Fundamentals and Materials Society  

    電気学会論文誌. A, 基礎・材料・共通部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A, A publication of Fundamentals and Materials Society 128(2), 67-74, 2008-02-01 

    The Institute of Electrical Engineers of Japan

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各種コード

  • NII論文ID(NAID)
    10021129352
  • NII書誌ID(NCID)
    AN10136312
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    03854205
  • NDL 記事登録ID
    9361094
  • NDL 雑誌分類
    ZN31(科学技術--電気工学・電気機械工業)
  • NDL 請求記号
    Z16-793
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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