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JEET, Vol. 10, No. 2, March 2015 
Modification of DC Flashover Voltage at High Altitude on the Basis of Molecular Gas Dynamics
FuSheng Guo 
Area 
C  Electrophysics and Applications 
Abstract 
The effect of altitude on thermal conduction, surface temperature, and thermal radiation of
partial arc was investigated on the basis of molecular gas dynamics to facilitate a deep understanding
of the pollution surface discharge mechanism. The DC flashover model was consequently modified at
high altitude. The validity of the modified DC flashover model proposed in this paper was proven
through a comparison with the results of highaltitude simulation experiments and earlier models.
Moreover, the modified model was found to be better than the earlier modified models in terms of
forecasting the flashover voltage. Findings indicated that both the thermal conduction coefficient and
the surface thermodynamics temperature of partial arc had a linear decrease tendency with the altitude
increasing from 0 m to 3000 m, both of which dropped by approximately 30% and 3.6%, respectively.
Meanwhile, the heat conduction and the heat radiation of partial arc both had a similar linear decrease
of approximately 15%. The maximum error of DC pollution flashover voltage between the calculation
value according to the modified model and the experimental value was within 6.6%, and the pollution
flashover voltage exhibited a parabola downtrend with increasing of pollution. 
Keyword 
Flashover,High altitude,Molecular gas dynamics,Energy balance model,Radiation

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