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Measurements and performance evaluations of natural ester and mineral oil-immersed identical transformers
International Journal of Electrical Power & Energy Systems ( IF 5.2 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.ijepes.2020.106517
Yusuf Cilliyuz , Yunus Bicen , Faruk Aras , Guzide Aydugan

Abstract The use of natural esters as an insulating liquid has become popular since the early 2000s. Studies in the literature emphasize the superiority of natural esters as compared to mineral oils. In these studies, the prominent properties of natural esters are presented as being environmentally friendly, safe, and delaying the aging of cellulosic insulation material. Although there is no doubt in terms of their characteristics, such as being environmentally and safe, exaggerated comments are made about the delay of aging of the paper material used in the insulation of transformer windings. This is because comparative experimental applications on mineral oil and natural esters are carried out under artificial and equal conditions provided in the laboratory environment. Whereas, performing these experiments on identical transformers will give more realistic results. In this study, two identical transformers were designed and equipped with precision fiber optic temperature sensors. Temperature differences that vary depending on the load between high voltage and low voltage windings were measured with a high degree of accuracy for both identical transformers. Besides these measurements, physical and chemical changes were analyzed on samples taken from insulation liquids. It was observed that the physical and chemical properties of the insulation liquids directly affect the operating performance of the transformers. Thanks to the differences in viscosity of insulating liquids, the heat dissipation due to losses in the windings were different for both transformers. Both heat distribution and temperature differences in the windings varied depending on the loading factors. Considering all these factors together, comprehensively evaluations were made on the aging rate of cellulosic insulation and the service life of the transformers.

中文翻译:

天然酯和矿物油浸式相同变压器的测量和性能评估

摘要 自 2000 年代初以来,使用天然酯作为绝缘液体已变得流行。文献研究强调了天然酯与矿物油相比的优越性。在这些研究中,天然酯的突出特性表现为环保、安全和延缓纤维素绝缘材料的老化。虽然就其环保、安全等特性而言,虽然毋庸置疑,但对于变压器绕组绝缘所用纸材料的延缓老化,却有夸大其词的说法。这是因为矿物油和天然酯的对比实验应用是在实验室环境中提供的人工和同等条件下进行的。然而,在相同的变压器上进行这些实验会得到更真实的结果。在这项研究中,设计了两个相同的变压器并配备了精密光纤温度传感器。对于两个相同的变压器,根据高压和低压绕组之间的负载而变化的温差以高精度测量。除了这些测量之外,还对取自绝缘液体的样品进行了物理和化学变化分析。据观察,绝缘液体的物理和化学性质直接影响变压器的运行性能。由于绝缘液体的粘度不同,两种变压器的绕组损耗导致的散热不同。绕组中的热分布和温差都因负载因素而异。综合考虑这些因素,对纤维素绝缘的老化率和变压器的使用寿命进行了综合评价。
更新日期:2021-02-01
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