Transactions of China Electrotechnical Society  2019, Vol. 34 Issue (20): 4179-4187    DOI: 10.19595/j.cnki.1000-6753.tces.L80745
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Research on Numerical Simulation of Thermal Field Electron Emission and Temperature Effect for Safety Spark Test Electrode
Zhao Yongxiu, Liu Shulin, Wang Yao, Wang Qi
School of Electrical and Control Engineering Xi’an University of Science & Technology Xi’an 710054 China

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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
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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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