Abstract
Due to its environment-friendless and excellent insulation performance, C 4 F 7 N and its mixtures with CO 2 have received extensive attention as SF 6 substitute gas in recent years. However, the experimental test on arc distinguish performance of C 4 F 7 N and its mixtures is quite expensive and time consuming. Therefore, it is very important to investigate the arc plasma behavior in C 4 F 7 N and to make a comparation with arc plasma in SF 6 by means of simulation. In this thesis, a 2D axial symmetry nozzle model based on the magneto-hydrodynamics theory has been built and calculated. The basic arc parameters are described by the coupled equations of fluid field and electromagnetic field. The temperature distribution of arc plasma in C 4 F 7 N, CO 2 and SF 6 has been calculated. The C 4 F 7 N arc has a similar arc radius to SF 6 arc in steady state. And the turbulence effect may need to be consider in the C 4 F 7 N arc simulation.
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