Analyzing the Impact of Thermal Aging on the Dielectric and Physicochemical Performance of Transformer Insulating Papers Impregnated With Natural Monoesters

IF 1.8 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Engineering reports : open access Pub Date : 2025-07-16 DOI:10.1002/eng2.70297

Gerard Ombick Boyekong, Gabriel Ekemb, Emeric Tchamdjio Nkouetcha, Ghislain Mengata Mengounou, Adolphe Moukengue Imano

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Abstract

The application of alternative liquids in power transformers, instead of traditionally used mineral oils, is increasing due to safety and environmental reasons. Current research focuses on inedible natural esters to reduce the cost of production while avoiding a conflict with the food industry. This paper presents the issues of a comparative aging study between thermally Upgraded Kraft (TUK) and Nomex-910 insulating papers. Both papers were impregnated with palm kernel oil methyl ester (PKOME) and thermally aged. Dielectric and physicochemical tests were performed on new and aged samples. The Nomex-910 paper AC Breakdown Voltage (BDV) exceeded the corresponding values obtained with the TUK paper. However, PKOME/TUK samples had a smaller acid number than PKOME/Nomex. The PKOME kinematic viscosity exhibited an increase with aging. Also, the 2-FAL content and the degree of polymerization (DP) were estimated from the mean UV absorption values. This study shows that insulating papers can be associated with natural monoesters to improve the performance of power transformers.

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热老化对天然单酯浸渍变压器绝缘纸介电性能和理化性能的影响分析

由于安全和环保的原因，替代液体在电力变压器中取代传统矿物油的应用越来越多。目前的研究重点是不可食用的天然酯，以降低生产成本，同时避免与食品工业发生冲突。本文介绍了热升级Kraft （TUK）和Nomex-910绝缘纸之间的老化比较研究问题。两张纸都浸渍了棕榈仁油甲酯（PKOME）和热老化。对新样品和旧样品进行了介电和理化试验。Nomex-910纸张的交流击穿电压（BDV）超过了TUK纸张获得的相应值。然而，PKOME/TUK样品的酸数比PKOME/Nomex样品小。PKOME的运动粘度随老化而增加。通过紫外平均吸收值估算了2-FAL含量和聚合度（DP）。本研究表明，绝缘纸可以与天然单酯相结合，以改善电力变压器的性能。

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