Cautions in the Use of Insulation Board

1. It has good resistance to arc and leakage.
Because the insulating board works outdoors and is directly affected by atmospheric conditions, it is also polluted by soot, water vapor and pulverized coal on the mixed traction railway line. The surface is easy to adhere to dust particles, resulting in insulation leakage. The arc makes the surface of the insulation board carbonized, and the carbon marks are distributed in irregular dendrites on the surface of the insulation board, which damages the insulation. Therefore, it is required that the insulation board must be strictly manufactured in order to ensure the surface smoothness, make it not easy to adhere to dirt, and have good arc resistance. Before using the insulating board, the sample should be tested for resistance to leakage and arc. It can be used only after meeting the requirements of IA2.5 level and arc resistance standard.
2. Do not make it work in the state of surface discharge, improve the service life of electrical.
The insulating board is used as the insulating medium between the catenary and the ground. Because of the small space under the bridge, the contact wire may contact with the insulating board and cause surface discharge. Epoxy FRP and SMC moulding plastics have a good linear relationship, while unsaturated poly-Cool FRP has a broken-line relationship, but both show that the service life of insulating materials will be greatly shortened under strong electric field (especially under surface discharge conditions), so the insulating plates should not work under surface discharge conditions as far as possible in engineering. The structure of catenary suspension should choose isolation suspension as far as possible, so that there is an air gap between the contact wire and the insulation board, forming secondary insulation. At this time, the ground voltage of catenary is mostly added to the air gap, and the voltage on the insulating board is low. Only when the electric locomotive passes under the bridge, the contact wire may contact the insulating board for a short time. Therefore, the insulating suspension can effectively prevent surface discharge and prolong the electrical life of the insulating board.