Pin type insulator 11kv price

The contamination discharge of the Pin Insulator refers to the flashover of the dirty outer insulation of the equipment under the working voltage, and a certain discharge phenomenon occurs when there is contamination.

In the natural environment, the Pin insulator is attacked by nitrogen oxides, salts and particulate dust, and a layer of dirt is gradually deposited on the surface. When the weather is dry, these dirty insulators maintain a high insulation level, and their discharge voltage is close to that of the clean state. When encountering fog, dew, drizzle, ice melting, snow melting and other humid weather, the surface of the pin insulator absorbs moisture, the electrolyte in the pollution layer dissolves and ionizes, resulting in an increase in the conductivity of the pollution layer, and the surface leakage current of the needle insulator will Increase.

Different structural forms and characteristics make them have different characteristics and performance. Due to the influence of the shape, structure and size of the pin insulator, as well as the uneven distribution of the contamination layer on the surface of the pin insulator and the different degree of humidity, the current of each part of the insulator surface is affected. Different densities result in the formation of a drying zone in the part with high current density. The formation of the drying zone makes the voltage distribution on the surface of the insulator more uneven, and the drying zone bears a higher voltage. When the electric field strength is large enough, a glow discharge will be generated, and then a local arc will be generated. The arc can either be extinguished or it can develop. When the local arc occurs and develops continuously and reaches or exceeds the critical state, the arc runs through the two poles, resulting in flashover.

The measures to prevent the contamination and discharge of pin insulators are as follows:

(1) Adjust the creepage distance of pin insulators, or use dust-proof insulators and silicone rubber insulators with strong anti-pollution ability;

(2) Purify the insulator and keep the surface of the insulator clean;

(3) Various anti-fouling coatings are used and placed on the surface of the pin insulator;

(4) Adopt various rain cover and silicone rubber climbing skirt;

(5) Using semiconductor glaze insulators;

(6) Intensify the management efforts, regularly conduct zero-quality and inferior-quality inspections on insulator strings, and replace zero-value and inferior-quality insulators in time.