What Is Rigid Insulation Board?

Insulation board, also known as insulation rubber pad, insulation pad, insulation pad, insulation blanket. Insulation pads are widely used in substations, power plants, power distribution rooms, test rooms, and field live operations.

Made of glue-type insulation material, there should be no harmful irregularities on the upper and lower surfaces of the insulation pad. Harmful irregularities of insulation pads are one of the following characteristics, which are defects that destroy uniformity and damage the smooth contour of the surface, such as pinholes, cracks, local bulges, cuts, inclusions of conductive foreign matter, creases, voids, bumps and corrugations, and casting Signs, etc. Harmless irregularities are surface irregularities formed during the production process.

Five or more different points should be randomly selected for thickness measurement and inspection on the entire insulation board. Measurements can be made with a micrometer or an instrument of the same accuracy. The accuracy of the micrometer should be within 0.02mm, the diameter of the measuring drill is 6mm, the diameter of the flat presser foot is (3.17 ± 0.25) mm, and the presser foot can apply a pressure of (0.83 ± 0.03) N. The insulation pad should be placed flat and Make the micrometer measurement smooth. ^[1]

(1) It can be divided into 5kv, 10kv, 20kv, 25kv, and 35kv according to the voltage level.

(2) According to color, it can be divided into: black rubber pad, red rubber pad, green rubber pad.

(3) According to thickness, it can be divided into: 0.15mm --- 130mm length and width specifications: 1020 * 1220, 1220 * 1220, 1000 * 2000, 1244 * 2440, 1500 * 3000.

General usage configuration

(1) 5KV insulating rubber pad. Thickness: 3mm. Specific gravity: 5.8KG / m ^2. Color: red, green, black.

(2) 10KV insulation rubber pad. Thickness: 5mm. Specific gravity: 9.2KG / m ² . Color: red, green, black.

(3) 15KV insulating rubber pad. Thickness: 5mm. Specific gravity: 9.2KG / m ² . Color: red, green, black.

(4) 20KV insulation rubber pad. Thickness: 6mm. Specific gravity: 11KG / m ² . Color: red, green, black.

(5) 25KV insulating rubber pad. Thickness: 8mm. Specific gravity: 14.8KG / m ² . Color: red, green, black.

(6) 30KV-35KV insulating rubber pad. Thickness: 10mm 12mm. Specific gravity: 18.4KG / m ² ; 22 KG / m ² . Color: red, green, black. ^[1]

Good physical and mechanical properties, excellent insulation performance, and can work in the environment with high dielectric constant requirements in dry -35 ~ + 100 air.

(With 8mm

1. With good arc resistance and tracking resistance.

Because the insulation board works outdoors and is directly affected by atmospheric conditions, it is also contaminated by oil fume, water vapor, and pulverized coal on the mixed traction railway line, and dust particles are likely to adhere to the surface, causing insulation leakage. The arc further carbonizes the surface of the insulating plate, and the carbon marks are distributed in an irregular tree shape on the surface of the insulating plate to damage the insulation. Therefore, it is required that the manufacturing process of the insulation board must be strict, ensure the surface smoothness, make it difficult to adhere to dirt, and have good arc resistance. Before using the insulation board, the samples should be tested for tracking resistance and arc resistance, and can only be used after reaching the national IA2.5 level and arc resistance standards.

2. Do not make it work under the surface discharge state, and improve the electrical service life.

The insulation board is used as the insulation medium between the contact grid and the ground. Due to the small space under the bridge, the contact wires may contact the insulation board and cause surface discharge. Epoxy glass fiber reinforced plastic and SMC molding compound have a good linear relationship, and unsaturated polycrystalline glass fiber reinforced plastic has a polyline relationship, but both indicate that the insulating material is under a strong electric field (especially under surface discharge conditions), and its service life will be greatly reduced. Therefore, in the project should try not to make the insulation board work under the state of surface discharge. Catenary suspension structure should use isolation suspension as far as possible, so that there is an air gap between the contact line and the insulation plate to form secondary insulation. At this time, most of the voltage on the ground of the catenary is applied to the air gap, and the voltage on the insulation board is low. Only when the electric locomotive passes under the bridge, the contact wire may make short-term contact with the insulation board. It can effectively prevent surface discharge and prolong the electrical life of the insulation board. ^[2]