This paper presents the analysis scheme for the arc conductance before the current zero and the thermal recovery characteristics after it in the interruption of alternative currents. In order to calculate the arc conductance and the thermal recovery, the electro-magnetic calculation module and the arc model were combined using user defined function (UDF) of a computational fluid dynamics (CFD) code "FLUENT." The measured results of the arc conductance in 145kV gas circuit breakers (GCB) and the post-arc current data in the 245kV GCB were used to verify the proposed method in this paper. And also, by using the method, the arc conductance and the thermal recovery characteristics before and after the current zero were estimated according to the shapes of the interrupter and the results were utilized to predict the interruption capability of GCB.
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