Electrical analysis of normal and aged high voltage transformer oil considering different size effects of Al2O3

World Journal of Engineering Pub Date : 2024-01-12 DOI:10.1108/wje-10-2023-0446

M. Khodsuz, A. H. Mashhadzadeh, Aydin Samani

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Abstract

Purpose Electrical characteristics of transformer oil (TO) have been studied during normal and thermal aging conditions. In this paper, breakdown voltage (BDV), partial discharge (PD), heat transfer results and the physical mechanisms considering the impact of varying the diameter of Al2O3 nanoparticles (NPs) have been investigated. Different quantities of the two sizes of Al2O3 were added to the oil using a two-step method to determine the positive effect of NPs on the electrical and thermal properties of TO. Finally, the physical mechanisms related to the obtained experimental results have been performed. Design/methodology/approach The implementation of nanoparticles in this paper was provided by US Research Nanomaterials, Inc., USA. The provided Al2O3 NPs have an average particle size of 20–80 nm and a specific surface area of 138 and 58 m2/g, respectively, which have a purity of over 99%. Thermal aging has been done. The IEC 60156 standard has been implemented to calculate the BDV, and a 500-mL volume test cell (Apar TO 1020) has been used. PD test is performed according to Standard IEC 60343, and a JDEVS-PDMA 300 device was used for this test. Findings BDV tests indicate that 20 nm Al2O3 is more effective at improving BDV than 80 nm Al2O3, with an improvement of 113% compared to 99% for the latter. The analysis of Weibull probability at BDV indicates that 20 nm Al2O3 performs better, with improvements of 141%, 125% and 112% at probabilities of 1, 10 and 50%, respectively. The results of the PD tests using the PDPR pattern also show that 20 nm Al2O3 is superior. For the heat transfer test, 0.05 g/L of both diameters were used to ensure fair conditions, and again, the advantage was with 20 nm Al2O3 (23% vs 18%). Originality/value The effect of Al2O3 NP diameter (20 and 80 nm) on various properties of virgin and aged TO has been investigated experimentally in this paper to examine the effect of proposed NP on electrical improvement of TO.

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考虑到 Al2O3 不同粒度效应的正常和老化高压变压器油电气分析

目的研究了变压器油（TO）在正常和热老化条件下的电气特性。本文研究了击穿电压 (BDV)、局部放电 (PD)、传热结果以及考虑到不同直径 Al2O3 纳米粒子 (NPs) 影响的物理机制。采用两步法将不同数量的两种尺寸的 Al2O3 添加到油中，以确定 NPs 对 TO 的电性能和热性能的积极影响。设计/方法/途径本文中的纳米粒子由美国 US Research Nanomaterials 公司提供。所提供的 Al2O3 NPs 平均粒径为 20-80 nm，比表面积分别为 138 和 58 m2/g，纯度超过 99%。已完成热老化。采用 IEC 60156 标准计算 BDV，并使用 500 毫升容量的测试池（Apar TO 1020）。结果BDV 测试表明，20 nm Al2O3 比 80 nm Al2O3 更能有效改善 BDV，前者改善了 113%，后者改善了 99%。对 BDV 的 Weibull 概率的分析表明，20 nm Al2O3 的性能更好，在概率为 1、10 和 50%时，分别提高了 141%、125% 和 112%。使用 PDPR 模式进行的 PD 测试结果也表明，20 nm Al2O3 更胜一筹。在传热测试中，为确保条件公平，两种直径的 Al2O3 均使用了 0.05 g/L，同样，20 nm Al2O3 更具优势（23% 对 18%）。原创性/价值本文通过实验研究了 Al2O3 NP 直径（20 nm 和 80 nm）对原生 TO 和老化 TO 的各种性能的影响，以考察拟议的 NP 对 TO 电性改善的影响。

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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World Journal of Engineering

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