- 學位論文
水力發電機瑕疵之局部放電量測
Off-line Partial Discharge Measurement on Hydro Generator Machines
摘要
局部放電（PD）的量測已用於評估高壓（HV）旋轉電機的絕緣，如電動機和發電機。目前，PD是利用先進的儀器和軟體進行量測。PD是由定子絕緣繞組的劣化或製造不佳所造成。大部分的測量方法透過電子干擾信號混合定子PD，其中電子干擾信號來自不佳的機械連接、電動工具的操作、輸電線路的電暈與變壓器的干擾等。因此，定子繞組的錯誤顯示的結果會降低在PD量測的信心。 本文透過在印尼北蘇門答臘Inalum水力發電廠的第二機組與第三機組，這兩台具有相似等級和設計，容量為79.2 MW, 11 kV的發電機，使用MPD600離線量測PD。相位解析局部放電(PRPD)、雙極直方圖與頻譜脈衝的測量和解釋，是最重要的計算結果，此結果表示定子繞組狀況有其貢獻，並讓機器在嚴重破壞之前優先進行保養。
並列摘要
Partial-discharge (PD) measurements have been used to assess the electrical insulation of high voltage (HV) rotating machines such as motors and generators. Recently, PD measurements is conducted using sophisticated instruments and software. PD is caused by deterioration or poorly made by stator-winding insulation. Most of the measurement methods mix stator PD with electrical-interference signals from poor electrical or mechanical connections, power tool operation, corona from transmission lines, from transformer interference, etc. Hence, the result can be false indications of stator-winding problems, reducing confidence in PD measurements. This thesis takes a case study in off-line PD measurement by using MPD600 at two generators, unit No.2 and No.3 which have similar rating and design with capacity 79.2 MW, 11 kV in Inalum hydro power plant, North Sumatera, Indonesia. The analysis and interpretation by phase resolve partial discharge (PRPD), bipolar histogram and frequency spectrum pulses are the most important result of the measurement which shows the condition of stator coil that gives contribution and lead to the maintenance priority conducted to which machine prior to serious damage.