本論文旨在應用電磁暫態程式(EMTP)，模擬線路用避雷器裝設於鐵塔後之故障率，進而評估線路用避雷器之可行性。研究過程中，首先，建立輸電鐵塔、輸電線、雷擊突波及線路避雷器模型。其次，建立雷擊電流波尾時間及峰值累積機率分佈，並考慮累積機率分佈下不同的參數值，進而以本研究所提出的模擬程序，計算線路用避雷器之故障率。最後，比較線路避雷器在不同的額定熱容量、安裝支數、安裝位置、塔腳電阻變化的情況下，分析避雷器之故障率變化情形，以建議線路用避雷器適當的安裝策略。本研究所獲致的結果，可以在電力公司裝設線路避雷器前，提供有價值的量化資訊，作為成本效益分析之參考。

The main purpose of this thesis is using the software, Electro-Magnetic Transients Program (EMTP), to calculate the failure probability of line arresters through a simulation approach, and then evaluate the effectiveness of the line arresters that installed on transmission line towers. Firstly, the major components of the study system including transmission tower, transmission line, lightning surge, and line arrester are modeled. Secondly, a simulation procedure is proposed to calculate the failure probability of the line arrester by considering the random parameters, i.e., the wave-tail and crest value of the lightning surge. Finally, comparative studies, taking the thermal capacity, number and installation position of the arresters, and the tower resistance into consideration, are conducted to suggest appropriate installation strategies of the line arrester. Results obtained from the study can provide the electric utility with valuable quantitative information in the cost-worth analysis of installing the line arrester.

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