Impact of Aging on Dielectric Properties of Oil-Paper Insulation System using Gas-to-Liquid Oil and Mineral Oil

2022 23rd International Middle East Power Systems Conference (MEPCON) Pub Date : 2022-12-13 DOI:10.1109/MEPCON55441.2022.10021778

M. Emara, E. G. Atiya, D. Mansour

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Abstract

Lately, gas-to-liquid (GTL) oil usage has a great trend as cooling and dielectric medium in power transformers due to their good properties, represented by its purity, chemical uniformity, and better performance than conventional oils. By the way, the study of GTL oil effect in comparison to conventional mineral oil (MO) on the electrical properties of the insulation paper under thermal aging is presented in this paper. Thermal aging samples were obtained based on an accelerated thermal aging test in the laboratory, that simulates the thermal stress in the service. Two different aging durations (i.e., 3 and 6 days) are applied to the two different oil types. Pure oils and aged oil samples were tested for dielectric losses and dielectric constant for a range of frequencies from 20 Hz to 2 MHz. In addition, insulation papers were impregnated in the same samples to check their effect by thermal aging. The results indicated that aging has a lower impact on the properties of GTL oil and GTL oil-paper insulation under aging conditions compared to that of MO.

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老化对气液油和矿物油油纸绝缘系统介电性能的影响

近年来，气液油因其纯度高、化学性质均匀、性能优于常规油等优点，在电力变压器中作为冷却介质和介电介质的应用有很大的发展趋势。同时，本文还研究了GTL油与常规矿物油(MO)在热老化条件下对绝缘纸电性能的影响。热老化样品是在实验室加速热老化试验的基础上获得的，模拟了服役中的热应力。两种不同的老化时间(即3天和6天)适用于两种不同的油类型。在20 Hz至2 MHz的频率范围内测试了纯油和老化油样品的介电损耗和介电常数。此外，还将绝缘纸浸渍在相同的样品中，通过热老化来检查其效果。结果表明，与MO相比，老化对GTL油和GTL油纸绝缘材料性能的影响较小。

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2022 23rd International Middle East Power Systems Conference (MEPCON)

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