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Cold start of a 240 MVA generator step-up transformer filled with natural ester fluid

机译：充满天然酯油的240 MVA发电机升压变压器的冷启动

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A 240 MVA, 165 GRDY/20 kV generator step-up transformer was insulated with EnvirotempTM FR3TM fluid. The transformer was energized during a cold temperature period in mid-December 2010. This is believed to be the largest generator step-up transformer filled with a natural ester fluid that was energized at low temperatures. The lack of cold start experience of natural ester filled power transformers created questions and at least some uncertainty as to outcome. This paper describes the instrumentation used and data collected during the cold startup procedure. In addition, a computational fluid dynamics analysis of this transformer design was performed that provided calculated temperatures and elapsed times until steady state temperatures were achieved. Comparisons are made between the actual and calculated values. The results indicate that the cold start up procedures for a power transformer are the same whether filled with mineral oil or natural ester fluid of similar characteristics as used for this work.
机译：使用EnvirotempTM FR3TM流体对240 MVA，165 GRDY / 20 kV发电机升压变压器进行绝缘。该变压器在2010年12月中旬的低温期间通电。据信，这是最大的发电机升压变压器，充满了在低温下通电的天然酯油。天然酯填充电力变压器缺乏冷启动经验，这带来了问题，并且至少对结果产生了一些不确定性。本文介绍了冷启动过程中使用的仪器和收集的数据。另外，对该变压器设计进行了计算流体动力学分析，该计算流体动力学分析提供了计算出的温度和经过的时间，直到达到稳态温度为止。比较实际值和计算值。结果表明，无论是填充矿物油还是天然酯液，电力变压器的冷启动程序都是相同的，其特性与此项工作所用的相同。

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