Effective Length Consideration with the Minimize Per-Unit Length Impulse Impedance Method

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In practice, sometimes long grounding wires are applied to decrease the grounding resistance but the lightning performance of the grounding system is still poor because the grounding wires have an effective length. This paper presents an analysis of effective length for horizontal/vertical grounding wires using the minimize per-unit length impulse impedance method. The grounding response due to lightning current was simulated by solving Telegrapher's equations with the finite-difference time-domain (FDTD) technique. During the simulation, the voltage distribution was low enough to limit the electric field intensity not exceeding the critical value for soil ionization, <i>E<sub>c</sub></i>. The results of the simulation were proved with scaling experiments. The simulation analysis showed that the effective length of the horizontal/vertical grounding wires decreases with front time of impulse current. For example, in soil resistivity of 50Ω.m, the effective lengths of the vertical grounding wire are 29m and 5.3m for impulse currents of 10/350<i>μ</i>s and 0.25/100<i>μ</i>s, respectively.

収録刊行物

  • 電気学会論文誌. B, 電力・エネルギー部門誌 = The transactions of the Institute of Electrical Engineers of Japan. B, A publication of Power and Energy Society  

    電気学会論文誌. B, 電力・エネルギー部門誌 = The transactions of the Institute of Electrical Engineers of Japan. B, A publication of Power and Energy Society 128(6), 871-878, 2008-06-01 

    The Institute of Electrical Engineers of Japan

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各種コード

  • NII論文ID(NAID)
    10021130943
  • NII書誌ID(NCID)
    AN10136334
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    03854213
  • NDL 記事登録ID
    9531710
  • 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
    Z16-794
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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