外文翻譯---關于標準或非標準沖擊波對電力變壓器的影響的研究(文件)
【正文】 formers to assess their insulation integ rity [1]. Transformer insulation is determined to a great extent by the transient voltages and stresses which appear in the transformer winding [2]. Varying impulse voltages with long wave shape and large magnitude may be due to switching fault, lightning surge or by mercial impulse voltage test in the laboratory [3]. In case of lightning impulse voltage test, standard waves shape of [4]. When the transformer is tested with standard wave shape, due to part winding resonance, the winding insulation is stressed with (unidirectional and bidirectional oscillatory) nonstandard waves. Also in practice all the ponents in a power system are stressed with transient over voltages of a wide variety of wave shapes caused by lightning as well as switching. Hence, it is necessary to estimate the dielectric strength of the insulation under these non standard impulse wave shapes [4].More than 50% of the failures in power transformers are due to insulation failure in windings [4]. To design the insulation it is necessary to know the voltage appearing across the insulation (as a function of time) and the strength of insulation against the particular voltage wave [2]. A SIMULINK model is constructed on the basis of the design data of a practical 3 MVA, 33/11 kV three phase transformer [2]. The main winding constitutes of 80 coils and 8 extra coils are used as tap coils [5]. The study of the behavior of the transformer winding with one grounded end is done when stressed by standard impulse voltage wave (),chopped impulse waves chopped at 3 181。這項研究在未來將被延伸到在其它非標準雷電沖擊波下絕緣特性的研究中，例如衰減波形和遞增振蕩波形。0%抽頭的情況比10%抽頭的情況包含更高的電壓。其在非標準雷電沖擊電壓波下的波形，代表了電場中實際遭遇過電壓時的電位波形，并且可以定量地研究其在標準雷電沖擊波下的波形[6]。針對線圈的過電壓響應的對比性研究已經完成，觀察結果被記錄在表IV中。圖3 0%抽頭時線圈梯度電壓最大值的變化情況表3 0%抽頭時線圈梯度電壓的最大值在圖4的(A)、(B)和(C)中,特性曲線表明了10%抽頭的線圈間電壓最大值的幾種不同的情況和分別在實際的全波、3 181。s, 8 181。s, 8 181。s和15 181。s 和 15 181。s截波、脈沖波、雙脈沖波形和阻尼振蕩波下的波形的不同。s,三種截波和阻尼振蕩波下0%抽頭和10%抽頭兩種線圈的對地電位的最大值和隨著測定時間進行的線圈間電壓的最大值。SIMULINK模塊的響應對于抽頭線圈是在低阻抗的特定參照下研究的,即分別針對抽頭線圈全開放（0%抽頭）和抽頭線圈處于實際情況下（10%抽頭）兩種情況在沖擊電壓波下進行試驗。s 和15181。SIMULINK模塊基于3MVA, 33/11 kV的三相變壓器的參數(shù)而建立[2]。同樣，在實踐中電力系統(tǒng)的所有組成部分都要承受由雷電或操作引起的不同種波形的瞬時過電壓的危險。變壓器絕緣在很大程度上視瞬時電壓和線圈上的壓力而決定[2]。對于變壓器承受標準或非標準沖擊波形時的表現(xiàn)將體現(xiàn)在本論文中。關于標準或非標準沖擊波對電力變壓器的影響的研究Kaveri Bhuyan, Member, IEEE, and Saibal Chatterjee, Member, IEEE摘要這篇論文詣在反映電力變壓器的過電壓性能的觀察結果。對于一定范圍內的實用波形（標準或非標準）和不同的線圈鏈接方式，對于代表了實際電場下的過電壓波形的非標準雷電沖擊電壓波形和標準雷電波形的比較就可以實現(xiàn)。沖擊試驗是一種有效的控制工具，它在電力變壓器上執(zhí)行，用以評估它們絕緣的完全性[1]。當
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