Thermal Characteristics of Positive Leaders under Different Electrode Terminals in a Long Air Gap

Mingxing Du, Yu Tang, Min Li, Jiayong Zou, Yigang Ma, Jinyu Sun, Lei Liu and Qingguo Zeng
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Mingxing Du: Tianjin Key Laboratory of Control Theory & Applications in Complicated System, Tianjin University of Technology, Tianjin 300384, China
Yu Tang: Tianjin Key Laboratory of Control Theory & Applications in Complicated System, Tianjin University of Technology, Tianjin 300384, China
Min Li: China Southern Grid Electric Power Research Institute, Guangzhou 510663, China
Jiayong Zou: Southwest Electric Power Design Institute Co., Ltd., China Electric Power Engineering Consulting Group, Chengdu 610021, China
Yigang Ma: Dali Bureau, CSG EHV Transmission Company, Dali 671000, China
Jinyu Sun: System Department, Baidu.com Times Technology (Beijing) Co., Ltd, Beijing 100193, China
Lei Liu: China Southern Grid Electric Power Research Institute, Guangzhou 510663, China
Qingguo Zeng: Sichuan Grid, Bazhong Power Supply Company, Bazhong 635500, China

Energies, 2019, vol. 12, issue 21, 1-13

Abstract: The thermal characteristics of the positive leader discharges occurring under the different electrode terminals in a 1 m rod-plate air gap were studied quantitatively using Mach–Zehnder interferometry and a high-speed video camera. When disturbed by the discharge channel, the interference fringes are distorted because of the change in the refractive index of air, which is related to the gas density. Therefore, the gas temperature and gas density distribution in the leader channel can be retrieved from the offset of the interference fringes. Based on these results, the thermal characteristics of the leader channel were studied under different electrode terminals with a radius of curvature of 2.5 mm and 5 mm for cone electrodes and a diameter of 40 mm for a spherical electrode. The results show that the gas temperature in the leader channel increased while the gas density decreased as the radius of curvature of the electrode terminal decreased. Additionally, a smaller radius of curvature leads to a larger thermal diameter, but the difference in the thermal diameter is not obvious; for the terminals used in this paper, the difference is within 2 mm.

Keywords: long air gap discharge; thermal characteristics; Mach–Zehnder interferometry (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: 2019
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