發電機的絕緣狀態診斷隨著局部放電量測技術的導入，而由離線量測轉為線上監測，以預防突發性的絕緣系統崩潰事故。本文依據IEEE-1434所建議的線上監測架構，以示波器卡及工業電腦，建立一套可長期安置於現場的發電機線上局部放電監測系統原型，進行信號收集、分析、資料儲存與放電圖譜展現之功能。係利用裝設在水力發電機出口端匯流排每相2只的高壓耦合電容器(High voltage coupling capacitor,HVCC)， 擷取發電機商業運轉時的局部放電脈衝信號，並利用2個信號通道的波形抵達時間差，以抵達時間法(time-of-arrival method)作波形比對使電力系統端傳入的干擾信號分離，最後使用局部放電相位解析(Phase Resolved Partial Discharge,PRPD)圖譜展現發電機內部的局部放電脈衝信號，可與典型的定子線圈瑕疵圖譜作比對，作為發電機絕緣狀態診斷的依據。結果顯示，本系統可調整量測參數以配合長時間量測，與商用儀器比對PRPD圖譜驗證自製系統性能，兩者圖譜細節呈現相似，在資料擷取同時能進入分析模式檢視歷史資料，綜合比對局部放電瑕疵圖譜後，判斷該水力發電機並無立即危險之放電活動。

The measurement of the status of an insulated generator with the introduction of partial discharge measuring technique, albeit with an off-line to on-line monitoring; altogether to prevent a sudden insulation system crash incident. This paper follows the proposed IEEE-1434 on-line monitoring framework, using an oscilloscope card and an industrial computer to establish a long-term installation of an on-site on-line partial discharge monitoring prototype on the generator for a series of functions: signal collection, analysis, data storage and discharge graph display. Utilizing the hydro-generator’s outlet end bus, 2 high voltage coupling capacitor (HVCC) per phase to retrieve the partial discharge pulse signal of the generator and utilizing the 2 waveform signal arrival time difference whilst employing the time-of-arrival method for waveform analysis in order to separate the power system side incoming interference signals. Finally, using Phase Resolved Partial Discharge (PRPD) maps to show the partial discharge pulse signals inside the generator. In comparison with a typical stator winding defect pattern, in accordance with the status of the insulated generator. The results show that the system can adjust its measurement parameters in accordance with long periods of measurement. Comparing the self-made PRPD pattern verification of system performance with a commercial instrument; both spectra share similar details in wave pattern. Whilst data acquisition, it is possible to enter data capture mode to view previous data analysis; after a comprehensive comparison of the partial discharge defect map in order to determine if or if not the hydro-generator is in immediate danger.

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