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ZHANG Junmin (张俊民), LU Chunrong (卢春荣), GUAN Yonggang (关永刚), LIU Weidong (刘卫东). Calculation of Nozzle Ablation During Arcing Period in an SF6 Auto-Expansion Circuit Breaker[J]. Plasma Science and Technology, 2016, 18(5): 506-511. DOI: 10.1088/1009-0630/18/5/11
Citation: ZHANG Junmin (张俊民), LU Chunrong (卢春荣), GUAN Yonggang (关永刚), LIU Weidong (刘卫东). Calculation of Nozzle Ablation During Arcing Period in an SF6 Auto-Expansion Circuit Breaker[J]. Plasma Science and Technology, 2016, 18(5): 506-511. DOI: 10.1088/1009-0630/18/5/11
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Calculation of Nozzle Ablation During Arcing Period in an SF6 Auto-Expansion Circuit Breaker

  • 1 School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China 2 Department of Electrical Engineering, Tsinghua University, Beijing 100084, China

Funds: supported by National Natural Science Foundation of China (Nos. 51177005 and 51477004)
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  • Received Date: September 07, 2015
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    • Abstract
  • The nozzle ablation process is described as two phases of heat and ablation in the interruption for an SF6 circuit breaker in this paper. Their mathematical models are established with the Fourier heat conduction differential equation respectively. The masses of nozzle ablation with different arc durations and arc currents are calculated through the model of the nozzle abla¬tion combined with an MHD (magneto-hydrodynamic) arc model. The time of the temperature rise on the inner surface of the nozzle under a given energy flux and of reaching the pyrolysis temperature under different energy fluxes is respectively analyzed. The relations between the mass of nozzle ablation and breaking current and arc duration are obtained. The result shows that the absorbing energy process before the nozzle ablation can be neglected under the condition of the energy flux entering into nozzle q>109 W/m2 . The ablation is the severest during the high-current phase and the ablation mass increases rapidly with the breaking current and with arc duration respectively.
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  • 1 Zhang J L, Yan J D, Murphy A B, et al. 2002, IEEE Transactions on Plasma Science, 30: 706 2 Yang F, Rong M Z, Wu Y, et al. 2011, IEEE Transactions on Plasma Science, 39: 2862 3 Jia J J, Zhao C Z, Cao G B. 1991, High Voltage Apparatus, 27: 9 (in Chinese) 4 Osawa N, Yoshioka Y. 2010, IEEE Transactions on Power Delivery, 25: 755 5 Muratovic M, Kapetanovic M, Ahmethodzic A, et al.2013, Nozzle ablation model: Calculation of nozzle ablation intensity and its influence on state of SF 6 gas in thermal chamber. IEEE International Conference on Solid Dielectrics, Bologna, Italy 6 Wang W Z, Wu Y, Rong M Z, et al. 2012, Journal of Physics D: Applied Physics, 45: 285201 7 Ruchti C B, Niemeyer L. 1986, IEEE Transactions on Plasma Science, PS-14: 423 8 Zhang J M, Yan J D. 2014, IEEE Transactions on Plasma Science, 42: 2117 9 Li M, Wu Y, Wu Y F, et al. 2014, IEEE Transactions on Plasma Science, 42: 2714 10 Muller L. 1993, Journal of Physics D: Applied Physics,26: 1253
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