The Electric Field Evaluation for Vibrating Rain Droplets on the Overhead Line Conductors

Shuxin Xu, Qi Li (), Wei Meng, Qi Tang, Li Li, Jianlin Hu and Xingliang Jiang
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Shuxin Xu: The Xuefeng Mountain Energy Equipment Safety National Observation and Research Station of Chongqing University, Chongqing 400044, China
Qi Li: The Xuefeng Mountain Energy Equipment Safety National Observation and Research Station of Chongqing University, Chongqing 400044, China
Wei Meng: Electric Power Research Institute of Guangdong Power Grid Co., Ltd., Guangzhou 510080, China
Qi Tang: Oriental Cables, Ningbo 315100, China
Li Li: Electric Power Research Institute of Guangdong Power Grid Co., Ltd., Guangzhou 510080, China
Jianlin Hu: The Xuefeng Mountain Energy Equipment Safety National Observation and Research Station of Chongqing University, Chongqing 400044, China
Xingliang Jiang: The Xuefeng Mountain Energy Equipment Safety National Observation and Research Station of Chongqing University, Chongqing 400044, China

Energies, 2023, vol. 16, issue 12, 1-13

Abstract: The water droplets on the surface of the overhead line (OHL) conductors are subject to an intensive electric field, which induces electric force on the charged liquid surface. Under the combined action of the surface tension as well as the electric force, movement and deformation can be observed on those water droplets. These result in a re-distribution of charge density on the liquid surface and therefore a re-distribution of electric force. In this paper, in order to strengthen the understanding of this complex multi-physics problem of interaction and mutual coupling, the vibration characteristics of water droplets under alternating electric fields is studied using the finite element method (FEM). Parameters such as the volume size of the water droplet, static/dynamic contact angle between the water droplet and conductor surface and voltage level are studied in relation to the vibration characteristics. The reproducible correlation between the phase and amplitude of the water droplet vibration on the surface of the conductor and the applied voltage is established. According to the calculated instantaneous electric field strength, it is explained that protrusions such as water droplets are the starting point of corona discharge.

Keywords: corona discharge; water droplet; electrohydrodynamics; finite element analysis; overhead line conductor (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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