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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Thermal degradation assessment of Kraft paper in power transformers insulated with natural esters
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Thermal degradation assessment of Kraft paper in power transformers insulated with natural esters

机译：天然酯绝缘电力变压器中牛皮纸的热降解评估

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摘要

Kraft paper in combination with dielectric oil is the most common as insulation system used in power transformers. The most used oil in power transformers is mineral oil. However, dielectric oils based on natural esters possess some advantages in comparison with mineral oil such as higher biodegradability, fire safety and availability. Therefore, they might be the most ideal substitute for mineral oil. The introduction of a new material requires the evaluation of its degradation rate because this determines transformers' life span. In order to assess the performance of new insulating systems based on vegetable oils, simulations to obtain the hot-spot temperatures in power transformers using vegetable oils and controlled laboratory experiments of ageing were carried out. The reason is that hot spot temperature inside windings of the oil-immersed power transformers is one of the main manifestations of the thermal stress which leads to aging of insulation systems. (C) 2016 Elsevier Ltd. All rights reserved.
机译：牛皮纸与绝缘油的结合是最常见的电力变压器绝缘系统。电力变压器中最常用的油是矿物油。但是，与矿物油相比，基于天然酯的介电油具有一些优势，例如更高的生物降解性，防火安全性和可用性。因此，它们可能是矿物油的最理想替代品。引入新材料需要评估其退化率，因为这决定了变压器的寿命。为了评估基于植物油的新型绝缘系统的性能，进行了模拟以获得植物油在电力变压器中的热点温度，并进行了老化的受控实验室实验。原因是油浸式电力变压器绕组内部的热点温度是导致绝缘系统老化的热应力的主要表现之一。 （C）2016 Elsevier Ltd.保留所有权利。

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