Investigations on the effect of ageing on charge de-trapping processes of epoxy–alumina nanocomposites based on isothermal relaxation current measurements

IF 3.8 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC IET Nanodielectrics Pub Date : 2020-10-13 DOI:10.1049/iet-nde.2020.0020
Subhajit Maur, Nasirul Haque, Preetha Pottekat, Biswajit Chakraborty, Sovan Dalai, Biswendu Chatterjee
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引用次数: 4

Abstract

In this study, the relationship between thermal ageing and charge trapping properties of epoxy-based nanocomposites has been investigated. With ageing, any dielectric material undergoes thorough degradation. This degradation significantly affects the space charge accumulation and charge trapping behaviour of the dielectric, which are very important parameters for insulation health under high-voltage direct current (HVDC) environment. In this work, an improved model based on the isothermal relaxation current (IRC) has been developed to study the charge trapping behaviour of pure epoxy and epoxy alumina (Al2 O3) nano-composites at different ageing conditions. A methodology based on polarisation–depolarisation current (PDC) measurements has been proposed to identify the current component due to a dipolar relaxation in measured total IRC. This will help to identify the trap distribution characteristics more accurately compared to conventional IRC measurements. It was experimentally observed that the addition of nanoparticles significantly reduces trapped charge formation and reduces thermal degradation. It is observed that aging leads to the generation of deeper traps, while the addition of Al2 O3 nanoparticles mainly enhances the density of shallow traps. Results presented in this work indicate that epoxy–alumina nanocomposites are very much suitable in HVDC applications from the perspective of trapped charge accumulation.

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老化对环氧-氧化铝纳米复合材料电荷脱陷过程影响的等温弛豫电流测量研究
本文研究了环氧基纳米复合材料的热老化与电荷俘获性能的关系。随着老化,任何介电材料都会彻底退化。这种退化严重影响了介质的空间电荷积累和电荷捕获行为,这是高压直流(HVDC)环境下绝缘健康的重要参数。本文建立了一种基于等温弛豫电流(IRC)的改进模型,用于研究纯环氧树脂和环氧氧化铝(Al2O3)纳米复合材料在不同老化条件下的电荷俘获行为。提出了一种基于极化-去极化电流(PDC)测量的方法来识别由于测量的总IRC中的偶极弛豫引起的电流分量。与传统的IRC测量相比,这将有助于更准确地识别圈闭分布特征。实验观察到,纳米粒子的加入显著减少了捕获电荷的形成,减少了热降解。结果表明:时效导致了深层陷阱的形成,而Al2O3纳米粒子的加入主要增强了浅层陷阱的密度。本研究结果表明,从捕获电荷积累的角度来看,环氧氧化铝纳米复合材料非常适合于高压直流应用。
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来源期刊
IET Nanodielectrics
IET Nanodielectrics Materials Science-Materials Chemistry
CiteScore
5.60
自引率
3.70%
发文量
7
审稿时长
21 weeks
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