Study On Effect Of Tropical Island Sea Fog On Insulator Flashover

Extent of tropical island grid contamination is not heavy. And the construction and maintenance of it is according with national standard. But tropical island grid is always facing the problems of serious pollution tripping and creepage phenomenon. This shows that the contamination of solid layer is not the main incentive. Site pollution severity class, and transmission distribution ruled by national standard which is based on type A solid pollution cannot solve the problem.Study on mechanism of insulator flashover did not reach unity. Study on factors of insulator flashover is mostly based on the deposited and humid of type A pollution. Study on effect of type B liquid pollution on insulator flashover is seldom. Study on prevention of flashover is also based on preventing contamination deposited. There exist some doubt about the effectiveness and valid date if the prevention used for type B pollution. Some grid staff found the phenomenon that fog can impact insulator flashover, but they did not study further. Only the island nation--Japan has been studied on pollution characteristic of coastal insulator. Therefore the existing research cannot explain and solve the problems tropical island grid is facing.This article researched on effect of tropical island sea fog on insulator flashover. This article analyzed the distribution and element of solid contamination at first, as well as the condensation nuclei of Type B pollution. And also analyzed fog season of tropical island. By compared with historical pollution accidents of grid, there produced a conclusion that the main reason for flashover accidents in tropical island is sea fog. Then artificial pollution tests on insulators in sea fog environment were used to verify the influence on insulator flashover voltage of sea fog salinity is greater than salt deposit density. Finally some advice about site pollution severity class, transmission distribution, and flashover warming has been offered for the hope for reliable tropical island grid.