Pollution Flashover Process and Influencing Factors of Transmission Line Insulators

1. Pollution flashover process of line post type insulators in transmission lines

The contamination of the line-post type insulators refers to the saturation value of the surface contamination after the insulator runs for a certain period of time, that is, the dynamic balance of the contamination adhering to the surface of the insulator and the contamination that is washed away by rain and blown away by the wind. state. The pollution degree of the insulator is related to its shape, the type and degree of environmental pollution, and the climatic conditions near the line. The types of insulator pollution are as follows:

(1) Natural pollution: farmland dust pollution, saline-alkali pollution, coastal seawater (fog) pollution, bird droppings pollution, etc.

(2) The second type of industrial pollution: the gas phase, liquid phase and solid phase pollutants discharged from the chimney during the industrial production process.

2. Factors affecting the fouling of line-post type insulators

(1) Influence of meteorological conditions: It depends on the influence of wind, rain, fog and other weather on the movement and deposition of dirt.

(2) Influence of voltage type: The amount of contamination on the surface of high-voltage insulators under DC voltage is higher than that of insulators under AC voltage.

(3) Influence of insulator type on pollution accumulation characteristics: ordinary insulators have ridges on the lower surface, serious pollution accumulation, and low pollution resistance level; The double-layer umbrella anti-fouling insulator has an open edge, the upper and lower surfaces are smooth without edges, the amount of pollution is small, the level of pollution resistance is high, and the anti-pollution effect is good.

(4) The influence of the installation type of the insulator string on the contamination: the contamination of the insulator string of the pendant string is the most serious. The upper and lower surfaces of the horizontal string insulator can be washed by rainwater, and its self-cleaning performance is the best. The contamination level of V-string insulators is between that of pendant and horizontal strings.

(5) Influence of insulator diameter: With the increase of the average diameter of the equipment, the surface contamination degree of the insulator decreases accordingly.

(6) Influence of voltage level: The higher the voltage level, the more serious the fouling and the greater the salt density.

(7) Influence of seasonal climate: The fouling of line-post type insulators generally starts from September every year and is the largest before the rainy season. After that, the salt density decreases due to rain erosion, and starts again when the climate is dry in autumn.

Fujian Ruisen New Materials Co., Ltd. was established in 2007 and is located in Fujian Province, China. Ruisen is the largest RTV silicone coating manufacturer in China, with many years of experience in manufacturing management and project management. We are a high-tech listed company specializing in R&D, design, manufacturing, sales and project construction in China. If you are interested in our products, you can consult online!