本文以地下電纜直線接頭做為試驗對象，在接頭接續處製做人工瑕疵，為考慮溫度對地下電纜之影響，故於地下電纜內部施加定電流，同時進行高電壓之加速老化試驗。每隔固定時間擷取試驗電壓與局部放電訊號，將擷取的資料進行濾波與化簡後，將其轉換成放電總合、平均放電、最大放電、放電次數與放電功率等五種轉換資料，從轉換資料的正、負半週中萃取出偏態、峰態、放電區域與區域重心等四種特徵參數，最後選出較能代表絕緣狀態評估規則之特徵組合。
經由分析與比對各種參數組合，本文選擇平均放電的正半週放電區域、正半週區域重心，建立老化軌跡趨勢，其老化軌跡初期分佈於軌跡圖的左半平面，隨著絕緣劣化的改變，軌跡逐漸由左半平面演進至右半平面，當軌跡遇到轉折點，軌跡開始呈現上升趨勢且到達崩潰。最後本文以軌跡後期轉折處做為絕緣狀態的判斷依據。

The underground cable joint with an artificial defect at the connection point is experimental object in this thesis. In order to take the temperature effect into consideration, a constant current is applied in the cable, then performing the accelerate aging experiment. The experiment voltage and partial discharge signal are measured at a specific time period. After filtering and simplifying, the acquired data are converted into five kinds of conversion data which are the discharge amounts, the average discharge amounts, the maximum discharge amounts, the number of discharge, and the power of discharge amounts. Then extract four characteristic parameters from the positive and negative half cycle of conversion data, such as, skewness, kurtosis, discharge zone, and gravity center of discharge. Finally, choose the better combination of characteristic parameters to represent the status of insulation.
By analyzing and comparing all kinds of parameters, the discharge zone of positive half cycle and the gravity center of discharge of positive half cycle are chosen to establish the trend of aging track plane. During the initial stage of degradation, the track moves gradually from the left-half plane to the right-half plane. When the track comes to its transition point at final stage, it tends to ascend and finally breakdown. Finally, the transition point of final stage is taken as the basis of insulation status diagnosis in this thesis.

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