A Simplified Model for Estimation of Electric Field of Positive Leader in Long Air Gaps

被引：0
|
作者：
Huang Y. [1 ]
Chen W. [2 ]
He H. [1 ]
Cheng C. [1 ]
Zhang W. [1 ]
Wu Y. [1 ]
Che J. [1 ]
机构：
[1] State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Hubei Province, Wuhan
[2] State Grid Corporation of China, Xicheng District, Beijing
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2023年 / 43卷 / 22期
基金：
中国国家自然科学基金;
关键词：
computational model; electric field; gas temperature; leader discharge; non-LTE;
D O I：
10.13334/j.0258-8013.pcsee.221794
中图分类号：
学科分类号：
摘要：
The characteristics of positive leader discharge are the primary concern of the external insulation design of the UHV AC and DC transmission systems as well as the lightning physics. The existing empirical models for the estimation of the electric field of the leader channel fail to consider the non-local thermal equilibrium (non-LTE) effect which can cause transient changes of the electric field. Aiming to consider the non-LTE effect, a numerical model is proposed in this paper. The simulated expansion process of leader radius is more consistent with the experimental results compared with the classical model. Based on a large number of simulation results, the relationship between the reduced electric field and the gas temperature of the leader channel is derived. Moreover, the transitional energy conservation equation of the leader channel is revised by adding the partition coefficient of the vibrational-translational relaxation and the conduction loss term. The proposed model is compared with the classical model. The simulation results of our model are consistent with the electric field inferred from experimental results under both switching impulses and lightning impulses. It is found that the classical model over-estimates the gas heating effect of the injected leader current, thereby leading to smaller electric field strength. Our model can be used to improve the existing leader propagation model. ©2023 Chin.Soc.for Elec.Eng.
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页码：8977 / 8986
页数：9
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