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Open Access

Time-domain Finite Element Method for Transient Electric Field and Transient Charge Density on Dielectric Interface

Teng WenXiang CuiXuebao Li( )Hao MaZhibin Zhao
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
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Abstract

This paper is devoted to solving the transient electric field and transient charge density on the dielectric interface under the electroquasistatic (EQS) field conditions with high accuracy. The proposed method is suitable for both 2-D and 3-D applications. Firstly, the governing equations represented by scalar electric potential are discretized by the nodal finite element method (FEM) in space and the finite difference method in time. Secondly, the transient constrained electric field equation on the boundary (TCEFEB) is derived to calculate the normal component of the transient electric field intensities on the Dirichlet boundary and dielectric interface as well as the transient charge density on the dielectric interface. Finally, a 2-D numerical example is employed to demonstrate the validity of the proposed method. Furthermore, the comparisons of the numerical accuracy of the proposed method in this paper with the existing FEMs for electric field intensity and charge density on the dielectric interface are conducted. The results show that the numerical accuracy of the proposed method for calculating the normal component of transient electric field intensities on the Dirichlet boundary and dielectric interface as well as the transient charge density on the dielectric interface is close to that of nodal electric potential and an order of magnitude higher than those of existing FEMs.

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CSEE Journal of Power and Energy Systems
Pages 143-154
Cite this article:
Wen T, Cui X, Li X, et al. Time-domain Finite Element Method for Transient Electric Field and Transient Charge Density on Dielectric Interface. CSEE Journal of Power and Energy Systems, 2022, 8(1): 143-154. https://doi.org/10.17775/CSEEJPES.2020.02170

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Received: 28 May 2020
Revised: 12 September 2020
Accepted: 25 October 2020
Published: 20 November 2020
© 2020 CSEE
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