隨著科技的發展，對電力系統之要求，已由提供不間斷之電源，提昇為提供安全、穩定且可靠之電力。本論文採用網路模型法中之最小切集法，分析線路各種多相復閉模式之故障情形，並研究在不同變電所架構下，配合線路多相復閉之故障狀況。在本論文中，亦收集與統計台電1996 ~ 2007年超高壓及一次輸變電系統設備數量、事故次數與停電時間等資料，作為可靠度計算之重要依據。最後，將統計收集之數據代入不同之故障情形，計算故障率，以評估各種線路多相復閉模式於不同變電所架構下之可靠度價值。

Reliability is an important issue in power systems. In order to provide a high level of continuity and quality of power to the customers, the multi-phase reclosing technique has been used in transmission system. In this paper, the minimal cut set method is used to analysis the reliability of multi-phase reclosing transmission system. Combining with the different substation frameworks, the optimal operation mode could be obtained.
For acquiring the precise reliability models, it is essential to provide the correct operation and consistent collection of data. It’s a pleasure to have the raw data of needed variables from Taipower within 1996~2007 which are the statics of number of outages, frequency, total outage time and mean duration for the equipments of substations. These variables is also discussed in this paper.

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