模鑄式比流器具有免維護、抗燃性極高的優點，所以廣泛的使用於配電系統中，且由於模鑄式比流器的事故會影響到電力系統的可考靠度，因此本文探討模鑄式比流器的絕緣老化軌跡。
本文選用三具不同絕緣狀態的模鑄式比流器，進行局部放電絕緣老化試驗，並同時擷取試驗時的量測資料。將量測資料利用Pearson相關係數的門檻進行濾波，並選用小波分析與算數平均數兩種分析方式，在平均放電量和放電區域所組成的絕緣狀態特徵圖上進行絕緣老化軌跡的分析。研究發現，兩種絕緣老化軌跡的分析方式，皆呈現規律性的絕緣老化軌跡，因此，若使用較為簡易的算數平均數，進行估測絕緣狀態時，即可望將此技術應用於即時線上監測，以提高供電之可靠度。

Cast-resin current transformers possess the advantage of free maintenance and high fire-resistant, so they are utilized extensively in distribution systems. Moreover, since cast-resin current transformers can influence the reliability of distribution system, herein the investigation will focus on the insulation aging track of cast-resin current transformers.
In this thesis, three different cast-resin current transformers are chosen condition to perform partial discharge insulation aging tests and collect the measured data during these tests. By the thresholding of Pearson correlation, the filtering is proceeded on these measured data. And two methods, wavelet analysis and arithmetic mean, are used to analyze the insulation status feature locus in terms of average discharge amount and discharge zone. The results show that both methods render quiet similar aging feature locus. As a consequence, if the simpler one which is the arithmetic mean method, can be used for the assessment of insulation status, then it is possible to apply the proposed methodology on on-line on-site monitoring system so as to highly upgrade the reliability of power supply.

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