Working Principles Of Silicone Rubber Shed for Porcelain Insulators Antifouling

Due to changes of weathers, especially in the case of haze weather or poor air quality, the pollution flashover becomes more and more serious in the power system with increasingly long running time.

Pollution flashover refers to the fact that the soluble substances on the insulating surface of electrical equipment gradually dissolve in water under humid conditions, forming a conductive film on the insulating surface, which greatly reduces the insulation level of the insulator and the phenomenon of strong discharge. Pollution flashover always brings great economic losses to the power system.

2 ways to avoid Pollution flashover

In order to avoid pollution flashover accidents, two measures can be taken: spraying anti-pollution flashover paint and installing silicone rubber anti-pollution flashover shed (also known as silicon rubber insulators). Spraying anti-pollution flashover paint can be applied to the surface of electrical insulation equipment in an all-round way, which can effectively improve the hydrophobicity and insulation of the equipment surface. And at the same time repair the small traces caused by electrical corrosion on the surface of the equipment.

The installation of the silicone rubber shed for porcelain insulators can be combined with the equipment body. In this way, the synergistic effect of the two measures is more significant and the creepage distance of the equipment is increased. Also, the anti-fouling performance of the power equipment is improved.

The silicone rubber booster for porcelain insulators refers to the silicone rubber shed made of high temperature vulcanized silicone rubber insulation material by injection or molding, By covering the upper surface of the porcelain and glass insulator shed, and bonding it with the original through adhesive (room temperature vulcanized silicone rubber), a combined insulation is formed. Usually, this high-temperature vulcanized silicone rubber insulating material is called a silicone rubber shed for porcelain insulator, electrical rubber insulators,  porcelain busbar insulator, or silicone rubber electrical insulator shed.

Working Principles of Silicone Rubber Shed for Porcelain Insulators Antifouling

Increase the creepage ratio of the insulator

By installing a silicone rubber shed with a larger outer diameter on the surface of the original insulator, it can increase the leakage distance of the insulator, which is an effective measure for adjusting the climbing of the insulator or bushing.

Silicone Rubber Has Good Hydrophobicity

The silicone rubber has good hydrophobicity and hydrophobic migration. The surface energy of the silicone rubber material is low, and the water exists in the form of isolated water droplets on the surface of the silicone rubber or on the surface of the dirt layer. In this way, the dirt layer is difficult to be wet. Therefore, the surface condition of the combined insulating medium is improved. As a result, the leakage current on the surface of the insulator after adding silicone rubber shed can be reduced, the pollution flashover can be effectively reduced, and the pollution flashover resistance voltage of the insulator can be significantly improved.

Self-cleaning

Large diameter silicone rubber shed can have the function of sheltering and reduce the pollution on the surface of the insulator or casing. At the same time, The silicone rubber shed itself has a certain slope, and the surface is smooth, and it is a soft elastic material, which has strong self-cleaning ability under the wind and rain. Therefore, the dirt accumulation and salt density of insulators or bushings are significantly reduced after the installation of the silicone rubber shed.

Arc Twists And Turns

The outer contour of the insulator or bushing is improved after adding the silicone rubber shed, and the arc channel is extended. Here we can see a comparison, before the installation, the pollution flashover path of the insulator or bushing is a straight line, while after the installation, the flashover path is a zigzag shape around the climbing skirt, and the distance is longer than a straight line.

Arc Blocking Effect

The installation of large-diameter silicone rubber shed near the upper and lower flanges can act as a barrier and prevent the generation and development of arcs.

Precaution For Accidents

The silicone rubber shed with a large diameter can prevent accidents caused by rain curtains and ice.