Historical Review and Summary on Measures Against Pollution Flashover Occurred in Power Grids in China

The main pollution flashover faults occurred in power system in China and the harm of large-area pollution flashover are expounded.The measures against pollution flashover adopted by domestic power systems in different historical stages are summarized.It is pointed out that the measures against flashover,including anti-ice flashover of insulators,anti-wet flashover of large-sized bushings and anti-bird pecking of composite insulators,are important contents in this field.Finally,it is also pointed out that to draft the standard to graduate the class of power system accidents caused by natural disasters under the principle of "ensuring sufficient insulation level and reserving margin" and to draw corresponding distribution map of disaster class as well as to enhance the preventing level have great significance for the prevention of pollution flashover.