Research and application of finite-element time-domain method for transient response of buried cable excited by an electromagnetic wave

Abstract

To analyze electromagnetic (EM) transient responses of a buried cable, an accurate and reliable time-domain method is proposed in this paper. The approach is based on the transmission line (TL) second-order telegrapher’s current equation, and the expressions of ground impedance and admittance at higher frequencies are used to obtain the discrete finite-element time-domain (FETD) equations for the cable. Finally, transient responses at termination loads of the buried cable are obtained based on the global FETD equation, which is assembled using discrete FETD equations on all intervals. The accuracy and effectiveness of the proposed FETD method are demonstrated by comparing numerical results to those of the finite-difference time-domain (FDTD) method. The proposed method is also employed to investigate the effects of numerous parameters on transient currents of the buried cable, including the soil conductivity, buried cable depth, and incident and polarization angles of the external EM wave.

KEYWORDS:

• Transient response
• buried cable
• finite-element time-domain (FETD)
• ground impedance and admittance

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by the Research Funds of Beijing Information Science & Technology University [grant number 2025021 and 2025022].

Notes on contributors

Yanfei Gong

Yanfei Gong was born in Shandong, China, in 1987. He received the Ph.D. degree in electrical engineering from North China Electric Power University, Beijing, China, in 2019, where he is currently a Lecturer with the School of Information and Communication Engineering, Beijing Information Science and Technology University. His main research interests include electromagnetic pulse (EMP) interaction with transmission lines, electromagnetic shielding.

Xingtong Chen

Xingtong Chen was born in Jilin, China, in 1993. She received the B.S. degree in electrical engineering from North China Electric Power University, Baoding, China, in 2016, and the M.S. degree in electronic science and technology from North China Electric Power University, Beijing, China, in 2019. She is currently an engineer with the State Grid Energy Research Institute, Beijing, China. Her main research interests include Internet of energy, power electronic technology, and power system modeling.

Yujie Li

Yujie Li was born in Hunan, China, in 1988. She received the B.S. degree in communication engineering from Changsha University of Science and Technology, Changsha, China, in 2010. She received the M.S. degree and Ph.D. degree, also in communication engineering, from Xiamen University, Xiamen, China, in 2014 and 2019. She is currently a Lecturer with the School of Information and Communication Engineering, Beijing Information Science and Technology University. Her main research interests include wireless communications, interference management and device-to-device communications.