Optical Spectroscopy Analysis of Ester Oils under Thermal Aging Conditions

2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) Pub Date : 2019-06-01 DOI:10.1109/ICDL.2019.8796836

Abdelrahman M. Alshehawy, D. Mansour, M. Ghali

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引用次数: 2

Abstract

Ester oils have been proposed recently as alternative insulating liquids to mineral oils inside oil-filled power transformers. They are environmentally friendly, biodegradable and harmless to human body. During the operation of power transformers, the insulating oil is subjected to thermal and electrical stresses. Consequently, it is decomposed, and the aging by-products are generated. As a result, the properties of insulating oil are degraded. This study aims to investigate the impact of thermal degradation on ester oils during the operation of power transformer using UV-Vis optical spectroscopy technique. First, several aged ester oil samples were prepared using an accelerated aging experiment. In addition, aged mineral oil samples were prepared to compare the impact of aging on both. Then, these samples were tested using optical spectroscopy test. The obtained optical spectra have been investigated and the aging by-products could be evaluated. Furthermore, dissipation factor test was carried out on the aged samples to correlate between the thermal degradation and the dielectric properties. The obtained results have assured that ester oils have great potential to substitute mineral oils in the future.

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热老化条件下酯类油的光学光谱分析

近年来，人们提出在充油电力变压器中使用酯类油作为矿物油的替代绝缘液体。它们对环境友好，可生物降解，对人体无害。在电力变压器运行过程中，绝缘油要承受热应力和电应力。因此，它被分解，并产生老化的副产品。结果导致绝缘油的性能下降。本研究旨在利用紫外可见光谱技术研究电力变压器运行过程中热降解对酯类油的影响。首先，采用加速老化实验制备了几种老化的酯油样品。此外，制备了老化矿物油样品，比较老化对两者的影响。然后，对这些样品进行光谱学测试。对所得的光谱进行了研究，并对老化副产物进行了评价。此外，还对老化样品进行了耗散系数测试，以确定热降解与介电性能之间的关系。研究结果表明，酯类油在未来替代矿物油方面具有很大的潜力。

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2019 IEEE 20th International Conference on Dielectric Liquids (ICDL)

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