安全火花试验电极热场致发射模型和温度效应的数值模拟研究

doi:10.19595/j.cnki.1000-6753.tces.L80745

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Abstract

The temperature distribution of cadmium electrode and thermal field electron emission (TFEE) properties based on safety spark test apparatus are studied to lay the foundation for studying the inductor-disconnected discharge characteristics and revealing the mechanism of arc discharge. According to quantum theory, the TFEE current density depends largely on such factors as the cathode surface temperature and applied electric field. Therefore, with the elliptic integral method, the mathematical expression of cathode electronic penetration rate was deduced. The relational expression between the TFEE current density, the cathode surface temperature and the applied electric field was derived. Considering the microcosmic surface morphology of the test electrode, the TFEE current density, joule heat and heat conduction effect, the temperature on the micro-protrusion of the cathode surface was computed with numerical method. The simulation results show that, the TFEE current density increases nonlinearly with the increase of the applied electric field and cathode surface temperature between the melting point and boiling point of cadmium electrode. Under different applied electric fields, the temperature of micro-protrusion increases nonlinearly with discharge time, and the growth rate increases. The temperature of micro-protrusion top rises to the melting point in a very short time (ns-grade), and thus the local micro-explosion electron emission occurred. It has laid a theoretical foundation for further research on the micro-mechanism of inductor-disconnected discharge and the evaluation of the non-explosive intrinsically safe performance for the inductive circuit.

Key words： Inductor-disconnected discharge cathode electron emission elliptic integral thermal field electron emission (TFEE) temperature effect

Received: 10 July 2018 Published: 30 October 2019

PACS:	O462
	TD68

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	Zhao Yongxiu
	Liu Shulin
	Wang Yao
	Wang Qi

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Zhao Yongxiu,Liu Shulin,Wang Yao等. Research on Numerical Simulation of Thermal Field Electron Emission and Temperature Effect for Safety Spark Test Electrode[J]. Transactions of China Electrotechnical Society, 2019, 34(20): 4179-4187.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.L80745 OR https://dgjsxb.ces-transaction.com/EN/Y2019/V34/I20/4179

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