臺灣博碩士論文加值系統

摘 要
大眾捷運系統穿梭於都會地區人口密集之處，首重安全，而安全應考慮的因素很多，其中供電系統的牽引動力變電站發生高壓接地故障的影響非常嚴重，因不但會造成停電而且造成接地系統地電位昇，此地電位昇可經由各種互連導體轉移至各地，形成一種轉移電壓之傷害，尤其軌道、車站、行控中心及維修廠都可能遭受此種轉移電壓傷害人員及設備的安全，目前國內的捷運系統尚處於萌芽階段累積經驗不足，對於接地故障的問題雖然在設計時已針對個別變電站考慮其接地電阻，但接地系統地電位昇引起的轉移電壓傷害，牽涉到整體系統地電位分佈的問題，有必要進一步分析並評估其影響，以作為防護的參考。
本研究探討大眾捷運系統牽引動力變電站接地故障之地電位分佈及其影響，首先建立其電路模型，此模型是一種「交錯連結的階梯電路模型」，此模型將考慮所有牽引動力變電站的接地系統及各種互連導體，然後依據此模型分析牽引動力變電站接地故障造成重要地點的地電位湧昇及其衍生的轉移電壓，最後根據分析結果進一步評估對人員及設備的影響。

ABSTRACT
The metropolitan rapid transit system（MRTS）passes through urban area with thick people distribution. The first consideration to MRTS is safety, i.e., the MRTS must be safe for people and equipments. Many factors affect the safety of MRTS, in which the high voltage ground fault occurred on the traction power substation is very critical to people and system. This is because of that the ground fault will not only cause the traction power system to tript out of service but also cause the grounding system to produce ground potential rise（GPR）which will be transferred to other places by some interconnected conductors to form transferred voltages to damage personnel and equipments, especially, the damage of transferred voltage may occurred on rail way, passenger stations, control center, maintenance/repair depot, etc. At present, the domestic MRTS are still in the initial stage with lack of experience in ground faults. In the problem of ground fault, although the grounding resistance had been considered in the design of each substation grounding system, the damage of transferred voltage can not be full characterized by grounding resistance without analysis of grounding potential distribution of the whole MRTS. The proposal is aimed to study the ground potential distribution when a ground fault occurred on the traction power substation of an operated MRTS.
In this paper, the ground potential distribution due to the ground fault on the traction power substation of metropolitan rapid transit systems (MRTS) and its affections are studied. The circuit model is called "the cross-bonding ladder circuit model". The circuit model represents the interconnected ground system of MRTS is first constructed, in which all the grounding systems of traction power substation and various interconnects conductors are considered. The ground potential rise (GPR) and the associated transfer voltages at the critical positions are analyzed by using the circuit model. Finally, the affections of GPR and the transfer voltages on the personnel and equipments are assessed.

第一章 緒論
1.1 研究動機及背景
1.2 過去研究概況
1.3研究內容及成果
1.3.1 電路模型之建立
1.3.2 地電位昇分析
1.3.3 影響分析

第二章 捷運系統分析
2.1模型的建立
2.2分析步驟
第三章 捷運淡水-新店線實例分析
3.1 淡水-新店線捷運系統及相關參數介紹
3.2 電路模型的建立
3.3 分析方法與步驟
3.4 實例模擬結果與比較
3.4.1牽引動力變電站接地電阻值對系統故障電流及地電位昇的影響
3.4.2遮蔽層導體阻抗值對系統故障電流及地電位昇的影響
3.4.3變電站互連導體阻抗值對系統故障電流及地電位昇的影響
3.5 討論
第四章 影響分析
4.1系統發生接地故障時，地電位昇對人員及設備之影響評估
4.2在系統參數改變時，地電位昇對人員及設備之影響評估
4.2.1牽引動力變電站接地電阻值的改變對人員及設備之影響評估
4.2.2遮蔽層導體阻抗值的改變對人員及設備之影響評估
4.2.3變電站互連導體阻抗值的改變對人員及設備之影響評估
第五章 結論
附錄
附錄A
附錄B
附錄C
參考文獻

〔1〕F. Dawalibi and George B. Niles, “Measurements and Computations of Fault Current Distribution on Overhead Transmission Lines”, IEEE Trans. on Power Apparatus and Systems, Vol. PAS-103, No. 3, March 1984, pp. 553-560.〔2〕F. Dawalibi, D. Bensted and D. Mukhedkar, “Soil Effects on Ground Fault Currents”, IEEE Trans. on Power Apparatus and Systems, Vol. PAS-100, No. 7, July 1981, pp. 3442-3449. 〔3〕J. Fortin and H. G. Sarmiento, “Field Measurement of Ground Fault Current Distribution and Substation Ground Impedance at LG-2 QUEBEC”, IEEE Trans. on Power Delivery, Vol. PWRD-1, No. 3, July 1986, pp. 48-60.〔4〕W. George, “Power System Ground Fault Current Distribution Using the Double-side Elimination Method”, IEEE Trans. on Power Delivery, Vol. PWRD-1, No. 1, 1986, pp. 17-25.〔5〕L. Levey, “Calculation of Ground Fault Current Using an Equivalent Circuit and a Simplified Ladder Network”, IEEE Trans. on Power Apparatus and Systems, Vol. PAS-101, No. 8, Aug 1982, pp. 2491-2497.〔6〕A. P. Meliopoulos,R. P. Webb, E. B. Joy and S. Patel, “Computation of Maximum Earth Current in Substation Switchyards”, IEEE Trans. on Power Apparatus and Systems, Vol. PAS-102, No. 9, Sep 1983, pp. 3131-3139.〔7〕Baldev Thapar, Victor Gerez, Arun Balakrishnan and Donald A. Blank, “Substation Grounding Grids Intertied Buried Conductors”, IEEE Trans. on Power Delivery, Vol. 7, No. 3, July 1992, pp. 1207-1212.〔8〕Laiding, J. F and F. P Zupa, “A Practical Ground Potential Rise Prediction Technique”, IEEE Trans. on Power Apparatus and Systems, Vol. PAS-99, 1980, pp. 207-216.〔9〕F. Dawalibi and N. BarBeito, “Measurements and Computations of the Performance of Grounding Systems Buried in Multilayers Soils”, IEEE Trans. on Power Delivery, Vol. 6, No. 4, Oct 1991, pp. 1483-1491.〔10〕F. Dawalibi, “Ground Fault Current Distribution Between Soil and Neutral Conductors”, IEEE Trans. on Power Apparatus and Systems, Vol. PAS-99, March/April 1980, pp. 452-461.〔11〕H. B. Gooi and S. A. Sebo, “Distribution of Ground Fault Currents Along Transmission Lines — An Improved Algorithm”, IEEE Trans. on Power Apparatus and Systems, Vol. PAS-104, March 1985, pp. 663-670.〔12〕S. A. Sebo, “Zero Sequemce Current Distribution Along Transmission Lines” IEEE Trans. on Power Apparatus and Systems, Vol. 88, No .6, June 1939, pp. 910-919.〔13〕C. F. Desieno, P. P. Marchenko and G. S. Vassell, “General Equations for Fault Currents in Transmission Line Ground Wires”, IEEE Trans. on Power Apparatus and Systems, Vol. PAS-89, No .8, Nov/Dec 1970, pp. 1891-1900.〔14〕L. Levey, “Computation of Fault Currents and Voltages along A Multigrounded Neutral Power Lines Having Multiple Phase Conductors”, IEEE Trans. on Power Delivery, Vol. 6, NO. 4, Oct. 1991, pp. 1541-1548.〔15〕Robert J. Heppe, “Computation of Potential at Surface Above an Energized Grid or Other Electrode, Allowing for Non-Uniform Current distribution”, IEEE Trans. on Power Apparatus and Systems, Vol. PAS-98, No .6, Nov./|DEC .1979 1978-1983.〔16〕S. T. SoBral, J. O. Barbosa and V. S. Costa, “Ground Potential Rise Characteristics of Urban Step-Down Substations Fed By Power Cables-- A Practical Example”, IEEE Trans. on Power Delivery, Vol. 3, NO. 4, Oct. 1988, pp.1546-1572.〔17〕S. T. Sobral, C. A. Peixoto, Douglas Trenandes and D. Mukhedkar, “Grounding Measurements at The Itaipu Generating Complex Using The ‘Extend Eleck Method’ ”, IEEE Trans. on Power Delivery, Vol. 3, No. 4, Oct 1998, pp. 1553-1563.〔18〕S. T. Sobral, V. G. P. Fleury, J. R. Villalba and D. Mukhedkar, “Decoupled Method for Studying Large Interconnected Grounding Systems Using Micro-computers”, part1 and part2, IEEE Trans. on Power Delivery, Vol. 3, No. 4, Oct 1998, pp. 1536-1552.〔19〕S. T. Sobral, C. A. O. Peixoto and D. Mukhedkar, “Ground Potential Distribution in the Neighberhood of the Itaipu Generation Complex”, IEEE Trans. on Power Delivery, Vol. PWRD-1, No. 1, Jan 1986, pp. 85-91. 〔20〕S. T. Sobral, Vasco S. Costa, Marcelo S. Campos and D. Mukhedkar, “Dimensioning of Nearby Substation Interconnected Ground System.”, IEEE Trans. on Power Delivery, Vol. 3, No. 4, Oct 1998, pp. 1605-1614.〔21〕S. T. Sobral, W. Castinheiras, V. S. Costa and D. Mukhedkar, “Interferences Between Fault Power Circuits and Communication Circuits or Pipelines─Simplification Using the Decoupled Methed”, IEEE Trans. on Power Delivery, Vol. 6, No. 4, Oct 1991, pp. 1599-1606.〔22〕IEEE Committee Report, “Safe Substation Grouding-PartΙΙ”, IEEE Trans. on Power Apparatus and systems, Vol. as-101PP.4006-4023 Oct.1982.〔23〕B. Thapar, V. Gerez, A. Balakrishnan, D. A. Blank, “Simplified Equations for Mesh and step Voltage in an AC Substation”, IEEE Trans. On Power Delivery Vol.6, No.2 PP.601-607, Apr.1991〔24〕R. Verma and D. Mukhedkar, “Ground Fault Current Distribution in Sub-Station, Towers and Ground Wires”, IEEE Trans. on Power Apparatus and Systems, Vol. PAS-98, 1979, pp. 724-730.〔25〕F. Dawalibi, D. Mukhedkar, “Optimum Design of Substation Grounding in a Two Layer Earth Structure, Part I II III”, IEEE Trans. on Power Apparatus and systems, Vol. PAS-94, No.2 PP. 252-271, Mar/Apr.1975.〔26〕ANSI/IEEE Std.80 “IEEE Guide for safety in AC Substation Grounding”, by IEEE Society, New York 1986.〔27〕IEEE Committee Report, “Safe Substation Grouding-PartΙΙ”, IEEE Trans. on Power Apparatus and systems, Vol. as-101PP.4006-4023 Oct.1982.