傳統的地網設計主要考量電力系統發生故障時，故障電流注入地網造成的地電位昇須符合國際規範要求。因此，所著重的是地網的低頻特性，對於在雷擊電流注入地網時，地網的高頻特性則較少文獻探討。
目前，模擬電力系統的雷擊特性主要採用電磁暫態程式軟體EMTP，該軟體係將地網表示成為等效的RLC電路，但卻缺少電路參數的估測方法。為彌補此項缺失，本研究比較地網阻抗的高、低頻特性並提出兩種參數估測方法，第一種係應用電磁分析軟體CDEGS模擬不同幾何形狀地網下的阻抗特性，擷取軟體輸出檔所計算之各分段導體的電位昇與電流分佈情形，利用阻抗串、並聯轉換公式，求取各分段導體之等效RLC參數；然而該法因忽略導體之間互阻抗效應，以致在高頻時有相當的誤差。針對這些缺失，本論文提出第二種估測方法，稱為曲線配適法，係利用軟體模擬或實地量測所得之阻抗特性資料，應用最小平方差計算等效π形電路之參數以近似原地網之阻抗曲線。曲線配適法不受限於地網大小或形狀等，但地網之阻抗特性資料取樣數量多寡或取樣頻率高低，則影響該地網之近似電路的準確性及其適用的頻率範圍。
最後評估此兩種方法應用於地網的等效RLC電路及其參數估計的準確性，以期建立電力系統雷擊分析用的EMTP軟體所需要的地網模型參數。

參考文獻
[1] S. Bourg, B. Sacepe, and T. Debu, “Deep earth electrodes in highly resistive ground: Frequency behavior,” in Proc. IEEE Int. Symp. Electromagnetic Compatibility, 1995, pp. 584–589.
[2] M. I. Jambak and H. Ahmad, “Measurement of grounding system resistance based on ground high frequency behavior for different soil type,” in Proc. Tencon, vol. 3, pp. 207-211, 2000.
[3] D. Romero “Quasi-static approximation of concentrated ground electrodes: experimental results”, 28th the International Conference on Lightning Protection, pp. 734-801, ICLP 2006, Kanazawa, Japan.
[4] L. Grecv “Modelling of grounding systems for better protection of communication installations against effects from electric power system and lightning” Telecommunications Energy Conference pp. 461- 468, 2001.
[5] H. Griffiths, A. Haddad and N. Harid “Characterisation of earthing systems under high frequency and transient conditions” Universities Power Engineering Conference Vol.1 pp. 188- 192, 2004.
[6] M. Ramamoorty, M. M. B. Narayanan, S. Parameswaran, and D. Mukhedkar, “Transient Performance of Groundings Grids,” IEEE Tran. on Power Delivery, vol. PWRD-4, pp. 2053-2059, Oct. 1989.
[7] 羅翊修，地網接地電阻與高頻雜散電流之模擬，清大電機碩士論文，民國94年6月。
[8] IEEE std 80-2000，IEEE Guide for Safety in AC Substation Grounding.
[9] J. Choi, Y. Ahn, S. Goo, K. Park, J. Yoon, G. Jung, “Direct Measurement of Frequency Domain Impedance characteristics of Grounding systems ”, IEEE Proceeding on power System Technology, pp. 2218-2221, 2002.
[10] 劉宗平編譯，電磁學理論基礎，高立出版社。
[11] 游信勝編譯，工程電磁學，偉明圖書有限公司，1997年8月。
[12] User’s Primer of CDEGS, Safe Engineering Services & Technologies Ltd, 2002,
[13] R.F. Harrington, “Field Computation by Moments Methods”, New York,1982.
[14] L. Grecv, and F. Dawalibi, “An Electromagnetic Model for Transients in Grounding Systems”, IEEE Trans. On Power Delivery, Vol.5, No.4 November 1990, pp. 1773-1781.
[15] L. Grcev and D. Hristov, “More Accurate Modelling of Earthing Systems Transient Behaviour”, Telecommunications Energy Conference, 1993. INTELEC’93. 15th International, Vol. 2, September 1993, pp.167-173.
[16] L. Grcev, “Computer Analysis of Transient Voltage in Large Grounding Systems ”, IEEE Trans. on Power Delivery, Vol. 11, No. 2, April 1996, pp. 815-823.
[17] L. Grcev and F. E. Menter, “Transient Electromagnetic Fields Near Large Earthing Systems”, IEEE Trans. on Magnetics,Vol. 32 No. 3 May 1996, pp.1525-1528.
[18] J. H. Richmond, “Radiation and Scattering by Thin-Wire Structures in the Complex Frequency Domain”, in Computational Electromagnetics, E. K. Miller, Ed., New York IEEE Press, 1992.
[19] 游雅筠，地網電磁特性之模擬，清大電機碩士論文，民國92年6月。
[20] F. Dawalibi, “Electromagnetic Fields Generated by Overhead and Buried Short Conductors Part 2 – Ground Networks”, IEEE Trans. on Power Delivery, Vol. PWRD-1, No. 4, October 1986, pp. 112-119.
[21] 薛小生、黃玉東，工業配電，第14章：工業配電接地工程，大中國圖書公司，92年9月，20版。
[22] 廖昌財 編譯，接地技術入門，全華科技圖書，90年12月。
[23] 高攸綱，屏蔽與接地，北京郵電大學出版社，2004年11月第1版。
[24] A. P. Meliopoulos and M. G. Moharam, “Transient Analysis of Grounding Systems”, IEEE Trans. On Power Apparatus and Systems, vol. PAS-102, pp. 389-399, Feb. 1983
[25] K. Mohamed, High-Voltage Engineering Theory and Practice, Marcel Dekker, INC., 1990
[26] L. Grecv and M. Popv, “On High-Frequency Circuit Equivalents of Vertical Ground Rod”, IEEE Trans. On power Delivery, Vol.20, No.2, April 2005.
[27] E. D. Sunde, Earth Conduction Effects in Transmission systems. New Yourk Van Nostrand, 1968.
[28] http://gis.esri.com/library/userconf/proc99/proceed/papers/ pap262/p262.htm
[29] 潘純新，電路合成，敦煌書局，85年7月初版。