Experimental Study on Icing-flashover Mechanism for Iced Transmission Line in Early Ice-melting Stage

Salting-out and filth migration phenomena in ice is found to be concerned with icing-flashover of transmission lines.Through the tests of salting-out and filth migration in ice,the reason why flashover more easily happens in early ice-melting stage of iced insulators is explained.The tests indicate that: The heavier the filth,the faster the migration;The conductivity of the meltwater is 1.5～2.5 times of the icing water;The conductivity of the meltwater changes more obviously with increasing icing time and filth migration time.