Open AccessAnalytical model for the transient permittivity of uncured TiO 2 whisker/liquid silicone rubber composites under an AC electric field
Author(s) -
Shen Zikui,
Xin Zhenyu,
Wang Xilin,
Wei Xinyu,
Jia Zhidong
Publication year - 2021
Publication title -
high voltage
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.732
H-Index - 20
ISSN - 2397-7264
DOI - 10.1049/hve2.12060
Subject(s) - permittivity , materials science , silicone rubber , electric field , composite material , dielectric , vacuum permittivity , whisker , transient (computer programming) , composite number , relative permittivity , computer science , optoelectronics , physics , quantum mechanics , operating system
Abstract The electric field grading of dielectric permittivity gradient devices is an effective way of enhancing their insulation properties. The in situ electric field‐driven assembly is an advanced method for the fabrication of insulation devices with adaptive permittivity gradients; however, there is no theoretical guidance for design. In this study, an analytical model with a time constant is developed to determine the transient permittivity of uncured composites under an applied AC electric field. This model is based on optical image and dielectric permittivity monitoring, which avoids the direct processing of complex electrodynamics. For a composite with given components, the increased filler content and electric field strength can accelerate the transient process. Compared with the finite element method based on differential equations, this statistical model is simple but efficient, and can be applied to any low‐viscosity uncured composites, which may contain multiple fillers. More importantly, when a voltage is applied to an uncured composite insulating device, the proposed model can be used to analyse the spatiotemporal permittivity characteristics of this device and optimise its permittivity gradient for electric field grading.