Abstract
The thermal shock of the arc is the main cause of electrode damage in the spark gap switch, reducing the reliability of the switch. In this paper, we investigate the erosion characteristics of high-current pulsed arc on the graphite electrode based on the energy coupling model between the switching arc and graphite electrode. The magneto-hydrodynamic (MHD) theory is adopted to calculate the current density and temperature distribution of the pulsed arc, and the arc is considered as energy source on the electrodes. The transient energy flux intensity and the response of the electrodes are calculated with several typical pulsed discharge, and the energy state of the graphite is achieved. The sublimation characteristics of graphite electrode are studied under transient heating condition. The paper reveals the mass-loss mechanism of the graphite electrode and verifies the effect of reducing the energy flux to achieve anti-ablation of the electrodes.
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Dai, H. et al. (2023). Dynamic Behavior of Graphite Electrode Under the Thermal Shock of the Pulsed Arc. In: Dai, D., Zhang, C., Fang, Z., Lu, X. (eds) Proceedings of the 4th International Symposium on Plasma and Energy Conversion. ISPEC 2022. Springer Proceedings in Physics, vol 391. Springer, Singapore. https://doi.org/10.1007/978-981-99-1576-7_6
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DOI: https://doi.org/10.1007/978-981-99-1576-7_6
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