Analytical model for the spatiotemporal permittivity of uncured-composite devices in an AC electric field

Shen, Zikui; Wang, Xiaohao; Xin, Zhenyu; Zhang, Tianfeng; Xu, Chi; Jia, Zhidong

doi:10.1088/1361-6463/abd9a7

Cited by 6 publications

(6 citation statements)

References 29 publications

(37 reference statements)

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“…According to the above theory, the speed of the transient process of permittivity varies in different areas [29]. According to Equations () and (), the kinetic equation for the permittivity is [30].

\mathrm{d}{\varepsilon }_{\text{eff}}/\mathrm{d}t={\alpha }^{-1}\left(A-{\varepsilon }_{\text{eff}}\right){\varphi }^{1/2}{E}^{2}

…”

Section: Theoretical Backgroundsupporting

confidence: 70%

“…According to the above theory, the speed of the transient process of permittivity varies in different areas [29]. According to Equations ( 12) and ( 13), the kinetic equation for the permittivity is [30].…”

Section: Transient and Spatiotemporal Analytical Model Of The Effecti...supporting

confidence: 69%

“…The simulation analysis in Ref [30] defaults to three assumptions: (1) the viscosity of the matrix is constant during the application of the assisted voltage; (2) ignoring gravity, the filler particles do not settle; and (3) ignoring thermal motion of the particles, the constructed dielectric gradient remains stable during the curing process. If the above three assumptions are valid, the conditions that need to be met are (1) Ensure that the viscosity of the matrix changes smoothly.…”

Section: Preparation Process Designmentioning

confidence: 99%

“…If the electric field is applied for a long enough time, the permittivity increases to the stable value in all regions. In this time series, not all the permittivity distribution is favourable to mitigate the electric field, which has been verified in Ref [30] based on finite element simulation. It is necessary to remove the assisted electric field at the right time (such as

{t}_{3}

) and then “freeze” (curing) the resulting dielectric gradient.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

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A fabrication method for adaptive dielectric gradient insulating components

et al. 2022

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Dielectric gradient components have advantages in electric field mitigation and insulation improvement. In this paper, we propose a fabrication method for adaptive dielectric gradient components using in situ AC electric field, including the mechanism and the corresponding operational procedures for industrial applications. Based on the electric polarisation and self‐assembly effect of the filler particles in the liquid matrix, the chain‐like structure in the high field strength region is constructed to enhance the local permittivity and mitigate the maximum of the spatial electric field. The dielectric gradient basin insulator is prepared by this method, and its flashover voltage is increased by 12.8% compared with that of a homogeneous dielectric basin insulator, and the improvement is 20.8% when metal particles are present on the surface. The more non‐uniform the initial electric field is, the greater the improvement in flashover voltage. This method is expected to promote the industrial application of dielectric gradient insulating components.

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\mathrm{d}{\varepsilon }_{\text{eff}}/\mathrm{d}t={\alpha }^{-1}\left(A-{\varepsilon }_{\text{eff}}\right){\varphi }^{1/2}{E}^{2}

…”

Section: Theoretical Backgroundsupporting

confidence: 70%

Section: Transient and Spatiotemporal Analytical Model Of The Effecti...supporting

confidence: 69%

Section: Preparation Process Designmentioning

confidence: 99%

{t}_{3}

) and then “freeze” (curing) the resulting dielectric gradient.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

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A fabrication method for adaptive dielectric gradient insulating components

et al. 2022

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“…The space charge accumulation accelerates the aging of dielectric materials and causes partial discharge, which will even lead to electric breakdown [ 6 ]. These phenomena enhance the risk of failure of insulating materials and shorten the service life of the electrical equipment [ 7 , 8 , 9 ]. Epoxy resin (EP) composite is widely used in HV/UHV DC transmission equipment.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Insight of Charge Transport in BaTiO3/Epoxy Composites

et al. 2023

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Space charge accumulation greatly influences the dielectric performance of epoxy composites under high voltage. It has been reported that nano-fillers can suppress the charge accumulation in the bulk of insulation materials. However, it is still unclear how the nano-fillers influence the charge distribution at the interface between the filler and polymeric matrix. In this work, the dielectric properties and the local dynamic charge mobility behavior at the interface of barium titanate/epoxy resin (BTO/EP) composites were investigated from both bulk and local perspectives based on the macroscopic test techniques and in-situ Kelvin probe force microscopy (KPFM) methods. Charge injection and dissipation behavior exhibited significant discrepancies at different interfaces. The interface between BTO and epoxy is easy to accumulates a negative charge, and nanoscale BTO (n-BTO) particles introduces deeper traps than microscale BTO (m-BTO) to inhibit charge migration. Under the same bias condition, the carriers are more likely to accumulate near the n-BTO than the m-BTO particles. The charge dissipation rate at the interface region in m-BTO/EP is about one order of magnitude higher than that of n-BTO/EP. This work offers experimental support for understanding the mechanism of charge transport in dielectric composites.

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