本論文主要目的在設計一高頻局部放電訊號放大和濾波處理偵測電路。近年來本實驗室已發展出可偵測氣體絕緣開關局部放電所產生之超音波信號的音射檢測技術，實際線上檢測時為了確認偵測結果，常同時使用傳統電氣式量測方法進行比對，以提高局部放電訊號量測結果的準確度。由於高頻比流器(HFCT)所量測之訊號為高頻電磁訊號，因此可避免機器與環境的低頻背景噪音干擾。然而，因為所量測的高頻放電訊號分佈在寬廣頻段，所以電路設計的難度提高很多。比起音射法的數十到數百千赫(kHz)量測範圍，電磁訊號的頻率可能達數十百萬赫芝(MHz)以上，因此從高頻比流器探頭所量測到的訊號會經過濾波器濾掉雜訊後再進一步放大。經過實測，本研究所設計之電路可以成功量測氣體絕緣開關的局部放電訊號。

In this thesis, a signal processing and modification circuit is developed to amplify and to filter the partial discharge (PD) signals generated in the gas insulating switch (GIS) that detected by using the high-frequency current transformer (HFCT). Acoustic emission (AE) technique is one of the modern PD measurement methods used to examine the ultrasonic signals produced by PD from GIS. Sometimes, to complement the detection deficiency of AE method, HFCT method is used. The HFCT method can substantially increase the precision of PD diagnosis. In addition, since HFCT signal is electrical, it is free from the interference of low frequency mechanical vibration noises. However, the use of HFCT will increase the difficulty of designing the detection system because the frequency of signals from HFCT measurements is in the range of several MHz to hundreds MHz. It is much higher than the signal frequency of acoustic methods which is several hundred kHz. We developed a circuit to amplify the HFCT signal and filter the noises. From the experiment results, the measurement system developed can be used to detect the HFCT-PD signal correctly.

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