變壓器油色譜分析是發(fā)現(xiàn)變壓器內(nèi)部早期潛伏性故障的重要手段,筆者針對某500 kV變壓器在投運初期發(fā)生的油色譜異常情況,結(jié)合變壓器局部放電帶電檢測和故障定位,綜合分析判斷了缺陷性質(zhì)和部位,為隨后變壓器的內(nèi)部檢查和消缺處理提供了有力的指導(dǎo)意見。內(nèi)部檢查結(jié)果與色譜分析、局放定位結(jié)果相吻合,充分驗證了故障診斷方法的有效性和正確性,為大型變壓器油色譜異常后的故障診斷和缺陷處理提供了經(jīng)驗。
Dissolved gas analysis(DGA)plays an important role in transformer latent defect diagnosis. Based on a new 500 kV transformer with abnormal DGA data, combined with on-line PD detection and ultrasonic location, the defect properties and locations are analyzed and diagnosed synthetically, which provides convincing guidance for succedent internal check and defects elimination. The actual results coincide well with the preceding analysis, which have fully confirmed the availability and validity of the defect diagnosis methods, and provide some useful experiences for defect diagnosis of large transformers.