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γ辐照和水老化对环氧微纳复合材料空间电荷特性的影响

Influence of Gamma Irradiation and Water Aging on the Space Charge Characteristics of Epoxy Micro-Nano Composites.

作者信息

Sukesh Babu Myneni, Sarathi Ramanujam, Imai Takahiro, Tanaka Toshikatsu

机构信息

Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai 600036, India.

Infrastructure Systems Research and Development Center, Toshiba Infrastructure Systems & Solutions Corporation, Toshiba-cho, Fuchu-shi, Tokyo 183-8511, Japan.

出版信息

Polymers (Basel). 2021 Mar 22;13(6):964. doi: 10.3390/polym13060964.

DOI:10.3390/polym13060964
PMID:33809863
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8004083/
Abstract

Epoxy micro-nano composites are well-known to exhibit enhanced electrical, mechanical as well as thermal properties compared to base epoxy resin. Yet, a clear understanding need to be achieved on the long-term aging performance of the epoxy micro-nano composites. The present review article is a comprehensive study on the impact of gamma irradiation and water aging on the space charge characteristics of epoxy micro-nano composites that are applicable as insulant in high-voltage power apparatus. Ion-trapping nanoparticles, which possess good oxidation resistance and high ion trapping ability, are being chosen as nanofillers along with silica micro fillers in epoxy micro-nano composite material for improving the reliability of electrical insulation structures. The epoxy micro-nano composite specimens were subjected to gamma irradiation (4 kGy and 8 kGy) and water aging (under room temperature and at 90 °C), to analyze the effect of aging on space charge accumulation and charge decay characteristics. The mean magnitude of accumulated space charge density of epoxy micro-nano composites tends to increase with an increase in gamma irradiation dose as well as an increment in water diffusion coefficient. The mean lifetime of the space charge decay during depoling has significantly reduced after gamma irradiation and is converse with water aged specimen. Voltage polarity reversal studies have indicated that a part of homo-charge injected from electrodes remained as hetero-charge just after polarity reversal and could result in the distortion of electric field thereby increasing the electric field enhancement factor.

摘要

与基础环氧树脂相比，环氧微纳复合材料具有增强的电学、力学和热学性能，这是众所周知的。然而，对于环氧微纳复合材料的长期老化性能仍需要有清晰的认识。本综述文章是对伽马辐射和水老化对环氧微纳复合材料空间电荷特性的影响进行的全面研究，这些复合材料可用作高压电力设备中的绝缘材料。具有良好抗氧化性和高离子俘获能力的离子俘获纳米颗粒，与二氧化硅微填料一起被选作环氧微纳复合材料中的纳米填料，以提高电气绝缘结构的可靠性。对环氧微纳复合材料试样进行了伽马辐射（4 kGy和8 kGy）和水老化（室温及90℃）处理，以分析老化对空间电荷积累和电荷衰减特性的影响。环氧微纳复合材料积累的空间电荷密度的平均大小倾向于随着伽马辐射剂量的增加以及水扩散系数的增大而增加。在伽马辐射后，去极化过程中空间电荷衰减的平均寿命显著缩短，而水老化试样的情况则相反。电压极性反转研究表明，从电极注入的一部分同号电荷在极性反转后仍保留为异号电荷，这可能导致电场畸变，从而增加电场增强因子。

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