Experimental investigation of thermal transfer coefficient by a simplified energy balance of fault arc in a closed air vessel

Mei LI (李美); Yifei WU (吴益飞); Peng GONG (弓鹏); Lin LI (李林); Huadan XU (许华丹); Fei YANG (杨飞)

doi:10.1088/2058-6272/ab511d

Plasma Science and Technology > 2020 > 22(2): 24001-024001. > DOI: 10.1088/2058-6272/ab511d

Mei LI (李美), Yifei WU (吴益飞), Peng GONG (弓鹏), Lin LI (李林), Huadan XU (许华丹), Fei YANG (杨飞). Experimental investigation of thermal transfer coefficient by a simplified energy balance of fault arc in a closed air vessel[J]. Plasma Science and Technology, 2020, 22(2): 24001-024001. DOI: 10.1088/2058-6272/ab511d

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Experimental investigation of thermal transfer coefficient by a simplified energy balance of fault arc in a closed air vessel

¹ State Key Laboratory of Eco-Hydraulic in Northwest Arid Region, Xi’an University of Technology, Xi'an 710048, People's Republic of China
² State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi'an 710049, People's Republic of China
³ Henan Electric Power Transmission and Transformation Construction Co. Ltd., Zhengzhou 450000, People's Republic of China

Funds: This work was supported in part by National Natural Science Foundation of China (Grant Nos. 51707145, 51807162, 51577144), Shaanxi province key R&D program 2019ZDLGY18-05, the China Postdoctoral Science Foundation (Grant Nos. 2016M600792, 2018M641007) and was selected from the 1st International Symposium on Insulation and Discharge Computation for Power Equipment.

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Received Date: August 26, 2019
Revised Date: October 22, 2019
Accepted Date: October 24, 2019

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Abstract

Abstract

The thermal transfer coefficient that represents the portion of energy heating the surrounding gas of fault arc is a key parameter in evaluating the pressure effects due to fault arcing in a closed electrical installation. This paper presents experimental research on the thermal transfer coefficient in a closed air vessel for Cu, Fe and Al electrode materials over a current range from 1–20 kA with an electrode gap from 10–50 mm and gas pressure from 0.05–0.4 MPa. With a simplified energy balance including Joule heating, arc radiation, the energies related to electrode melting, vaporization and oxidation constructed, and the influences of different factors on thermal transfer coefficient are studied and evaluated. This quantitative estimation of the energy components confirmed that the pressure rise is closely related to the change in heat transport process of fault arc, particularly in consideration of the evaluation of Joule heating and radiation. Factors such as the electrode material, arc current, filling pressure and gap length between electrodes have a considerable effect on the thermal transfer coefficient and thus, the pressure rise due to the differences in the energy balance of fault arc.
- fault arc,
- energy balance,
- pressure rise

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References

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Experimental investigation of thermal transfer coefficient by a simplified energy balance of fault arc in a closed air vessel