本論文旨在推導二次側三角形結線中性點接地變壓器及Zig-Zag接地變壓器之數學模型，並探討其優劣與可行之應用。傳統變壓器二次側三角形結線之接地方法，主要為角接地與中間抽頭接地兩種，然而這兩種接地方法皆會使系統三相線對地電壓不一致，故於近年有專利文獻提出中性點接地的方法，來改善前述系統三相線對地電壓不一致問題，所提出的中性點接地方法可透過1至6組接地繞組來達成，但因三相結構上的不對稱，不易推導其對稱成分模型及評析其運轉特性，故本論文採用對稱結構的三個接地繞組模式來進行數學模型的推導、應用模擬及運轉特性之分析與比較。
首先，本論文推導上述兩種變壓器之數學模型與等效電路模型。接著，利用商用套裝軟體Matlab/Simulink® 建構其等效電路模型功能模組，並將之加入標的範例配電網路模型中，以驗證其正確性與適用性。續而，進行應用研究與性能評比，探討其優劣與適用範圍。最後，本論文綜合歸納出分析與評比結果，俾提供為電力公司於進行系統規劃、設計、運轉、維護等相關作業時之參考與應用。

This thesis aims to derive mathematical models of power transformer with neutral-grounded delta-connected secondary windings and Zig-Zag transformer, and discuss their advantages and disadvantages and feasibility of the applications. Traditional grounding methods of a power transformer with delta-connected secondary windings are corner grounding and mid-tap grounding methods, but the two grounding methods will make the three line-to-ground voltages inconsistent. Hence, recently, a patent suggests the neutral-grounding method to improve the preceding voltage inconsistent problem. The proposed neutral-grounding method applies 1 to 6 grounding winding(s) to solve the voltage inconsistent problem, but four of them are with three phase asymmetric structures, that will make difficult to derive their symmetric component model and analyze their operating characteristics. Thus, this thesis employs the one with a symmetric structure of three grounding windings.
First, this thesis derived the mathematical models and equivalent-circuit models of the two transformers. Next, a commercial software package, MATLAB/Simulink® is applied to construct equivalent-circuit model function blocks and included in the network model of a test distribution system in order to verify its accuracy and applicability. After that, this thesis discuss their advantages and disadvantages and possible scope of application. Finally, this paper synthesizes the results of analysis and appraisal. That can provide electric power company as a helpful reference to carry out their own system planning, design, operation, maintenance and other related operations.

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