During the long-term operation of insulators, they are subject to various natural and artificial influences. The pollution deposited on the surface of insulators will greatly reduce the electrical strength of insulators under the action of meteorological conditions such as rain, snow, fog and frost, as well as the specific environment, such as the long-term emission of chemical gas by chemical plants around the line, and thus pollution flashover accidents may occur. So, what are the specific pollution types of insulators?
(1) Natural pollution: mainly produced under natural conditions of pollution, specifically can be divided into dust pollution, salt and alkali pollution, sea salt or seawater pollution, guano pollution;
(2) Ice and snow pollution: Ice and snow pollution is a special pollution of insulator. When the ice or snow melt, it will significantly improve the surface conductivity of the insulator, resulting in insulator flashover accident under the operating voltage, which is also called ice flashover accident.
(3) Industrial pollution: industrial pollution refers to the gas phase, liquid phase, and solid phase pollutants discharged in the process of industrial production, which mainly occurs in industrial cities, suburbs and industrial concentrated areas, including the above mentioned chemical plants, smelters and thermal power plant smoke, cement plants, coal and mine dust, circulating water cooling tower or fountain acidizing water mist.
