Gelling behaviour of natural ester transformer liquid under thermal ageing

2012 International Conference on High Voltage Engineering and Application Pub Date : 2012-11-26 DOI:10.1109/ICHVE.2012.6357101

W. Lu, Q. Liu, Z. Wang

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引用次数: 10

Abstract

There have been increasing interests on natural esters as potential substitutes to conventional mineral oils in transformers, due to their less-flammable, non-toxic and environmentally friendly properties. The application has been successful in traction and distribution transformers with sealed type. But the susceptibility to oxidation and hence the suspected gelling behaviour prevent the application of natural esters in free-breathing transformers. This paper presents an experimental study of gelling/oxidation behaviour of thin films of a natural ester under thermal ageing. Ageing experiments were carried out with presence of air at different temperatures of 120 °C and 20 °C and durations up to 2 years. The gelling/oxidation behaviour of natural ester was evaluated in terms of changes in viscosity and acidity. Results showed that both viscosity and acidity can be used to assess gelling/oxidation behaviour of natural ester from initial liquid phase to eventually gelled form. In addition to temperature, the thickness of the thin film samples has a significant effect on the gelling speed, i.e. the thinner of the film, the faster of the gelling speed.

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热老化下天然酯类变压器液的胶凝行为

由于天然酯具有不易燃、无毒和环保的特性，因此人们越来越关注天然酯作为变压器中传统矿物油的潜在替代品。在密闭式牵引、配电变压器中得到了成功的应用。但是对氧化的敏感性以及因此怀疑的胶凝行为阻碍了天然酯在自由呼吸变压器中的应用。本文对天然酯薄膜在热老化条件下的胶凝/氧化行为进行了实验研究。老化实验在120°C和20°C的不同温度下进行，持续时间长达2年。根据粘度和酸度的变化来评价天然酯的胶凝/氧化行为。结果表明，粘度和酸度都可以用来评估天然酯从初始液相到最终凝胶态的胶凝/氧化行为。除温度外，薄膜样品的厚度对胶凝速度有显著影响，即薄膜越薄，胶凝速度越快。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2012 International Conference on High Voltage Engineering and Application

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