Effect of dilution gas composition on the evolution of graphite electrode characteristics in the spark gap switch

Hongyu DAI (戴宏宇); Lee LI (李黎); Shuai REN (任帅); Jingrun GUO (郭景润); Xin GONG (宫鑫); Anthony Bruce MURPHY

doi:10.1088/2058-6272/abf126

Plasma Science and Technology > 2021 > 23(6): 64009-064009. > DOI: 10.1088/2058-6272/abf126

Hongyu DAI (戴宏宇), Lee LI (李黎), Shuai REN (任帅), Jingrun GUO (郭景润), Xin GONG (宫鑫), Anthony Bruce MURPHY. Effect of dilution gas composition on the evolution of graphite electrode characteristics in the spark gap switch[J]. Plasma Science and Technology, 2021, 23(6): 64009-064009. DOI: 10.1088/2058-6272/abf126

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Effect of dilution gas composition on the evolution of graphite electrode characteristics in the spark gap switch

¹ State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Key Laboratory of Pulsed Power Technology (Ministry of Education), School of Electrical and Electronic Engineering, Huazhong University of Science & Technology, Wuhan 430074, People's Republic of China
² CSIRO Manufacturing, Lindfield NSW 2070, Australia

Funds: The study was supported by National Natural Science Foundation of China (Nos. 51777082 and 52077091), and Chinese Scholarship Council (No. 201906160101). The authors thank Huazhong University of Science and Technology Analytical and Testing Center for providing testing equipment.

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Received Date: January 10, 2021
Revised Date: March 21, 2021
Accepted Date: March 22, 2021

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Abstract

Abstract

As the widely implemented electrode material, graphite has the characteristic of sublimation by the thermal shock of the switching arc, and the produced carbon vapor is easy to condense into carbon powders and deposit in the switch. The impact of the type of dilution gas in a mixture of 20% oxygen and 80% dilution gas on the sublimation and oxidation characteristics of the graphite electrode is investigated. It is found that when nitrogen dilution gas was replaced by argon, the heat flux to the electrodes decreased, which led to a 63% reduction of graphite sublimation. At the same time, the cooling rate of the arc was slower in argon, which promotes oxidation of the carbon vapor. The residual solid carbon can be reduced by 70%–85% by using argon as the dilution gas. Consequently, it is demonstrated that the stability and working life of the switch could be increased by appropriate selection of the dilution gas.
- pulsed discharge,
- graphite electrode,
- thermal arc,
- dilution gas,
- electrode erosion

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References (46)

References

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Effect of dilution gas composition on the evolution of graphite electrode characteristics in the spark gap switch