There has not been an acknowledged theory to explain the cause of the electric conduction process of pollution flashover on the insulators yet. Based on the two existing breakdown mechanism theories, the authors put forward a new theory - the theory of plasmoid shortens the valid insulation distance by which leads to breakdown [1], whose main viewpoint is whether the breakdown occurs depends on the comparing between the valid insulation distance on insulator's surface and the shortened valid insulation distance on insulator's space around by the plasma. Based on the new theory, the conditions of pollution flashover, the development processing and the plasma energy consumption processing after the flashover are given detailedly. According to the mathematics model put forward in literature [1], the emulation for the steady state of polarity local electric arc plasma is made by CFD software-FLUENT. The result shows the exactness of the theory.
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