Dielectric characterisation of epoxy nanocomposite with barium titanate fillers

IF 3.8 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC
Romana Zafar, Nandini Gupta
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引用次数: 10

Abstract

High permittivity materials are currently in use for mitigation of electrical stress in high-voltage apparatus and energy storage systems. In this work, epoxy-based high permittivity nanocomposites with Barium titanate (BaTiO3) nanofillers are considered, for the purpose of stress mitigation. Uniform dispersion of the fillers in the polymer up to 10% by volume is achieved. Apart from the use of as-received fillers, the effect of using surface-functionalised nanoparticles (with 3-glycidoxypropyltrimethoxy-silane) before use is also investigated. The nanocomposite is characterised in terms of its complex permittivity, DC conductivity, short-term AC breakdown strength and space charge accumulation, to gauge its suitability for use in high-voltage insulation. Complex permittivity is measured using broadband dielectric spectroscopy over a broad frequency range of 1 mHz to 1 MHz. DC conductivity is studied from polarisation–depolarisation current measurements. Short-term AC breakdown strength tests are performed at power frequency (50 Hz). Space charge density along the sample thickness is obtained using pulsed electro-acoustic technique. A computational case-study is presented to show the feasibility of using the high permittivity nanocomposite for electric stress control in high-voltage equipment (viz., at mounting flanges of 69 kV bushings).

Abstract Image

钛酸钡填充环氧纳米复合材料的介电特性
高介电常数材料目前用于减轻高压设备和能量存储系统中的电应力。在这项工作中,为了减轻应力,考虑了具有钛酸钡(BaTiO3)纳米填料的环氧基高介电常数纳米复合材料。填料在聚合物中的均匀分散达到10体积%。除了使用收到的填料外,还研究了在使用前使用表面官能化纳米颗粒(具有3-环氧丙氧基丙基三甲氧基硅烷)的效果。纳米复合材料的特点是其复介电常数、直流电导率、短期交流击穿强度和空间电荷积累,以衡量其在高压绝缘中的适用性。复介电常数是使用宽带介电光谱在1的宽频率范围内测量的 mHz至1 MHz。通过极化-去极化电流测量来研究直流电导率。在工频(50 Hz)。使用脉冲电声技术获得了沿样品厚度的空间电荷密度。给出了一个计算案例研究,以表明在高压设备中使用高介电常数纳米复合材料进行电应力控制的可行性(即,在69的安装法兰处 kV套管)。
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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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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