Detailed Explanation Of Insulator Knowledge--factors Of Pollution Flashover

1 Effect of altitude

Due to the low atmospheric pressure at high altitude, discharge is very likely to occur, and the arc is thicker. After the AC passes zero, the circuit is very likely to discharge, and the arc is easy to reignite and difficult to extinguish. Therefore, the insulation of power transmission and transformation equipment operating at high altitude and low air pressure should be strengthened. When calculating insulation coordination, its influence must be fully considered, and its pollution flashover voltage should be appropriately increased. Generally, when the altitude is above 3000 m, the pollution voltage value should be increased by about 25%.

2 Effect of dead end insulators Ice and snow

dead end suspension insulators Ice and snow have different effects on pollution flashover voltage. After experimental research by relevant scientific research departments, polymer deadend insulator When pollution occurs first and then ice forms, under the same salt density, its pollution flashover voltage can be increased regardless of whether it is in a frozen state or in a melted state. If the ice is fully melted, its withstand voltage remains unchanged. Normally, ice and snow are often contaminated in the air and then frozen on the ground. At this time, the withstand voltage value is the lowest, and flashover accidents are very likely to occur. At present, countries around the world are very concerned about the impact of high altitudes and heavy ice areas on the electrical strength of porcelain dead end insulators, and are actively carrying out research.

3 Impact of acid rain and acid mist

Due to different geographical environments, atmospheric pollution causes acid rain and acid mist to exist in some areas to varying degrees. Since the conductivity of acidic pollutants increases with the decrease of pH value, the flashover voltage of suspension insulator is greatly reduced. With the acceleration of industrialization, the situation of atmospheric pollution of the power grid has become more severe, so it is necessary to improve environmental awareness, increase law enforcement efforts, and take technical measures to strengthen the management of power transmission and transformation equipment to avoid flashover accidents.