Application of insulating board in power distribution room
With the further development of power technology, the security and stability of power supply are becoming more and more important.
Insulating board, also known as insulating rubber pad, insulating pad, insulating pad, insulating blanket. The insulating board is widely used in substations, power plants, power distribution rooms, laboratories and field live working applications.
Precautions
1. As the insulating board works outdoors, it can be directly affected by atmospheric conditions, and it is also polluted by lampblack, water vapor and pulverized coal on the mixed traction railway line. The surface layer is easy to adhere to dust particles, causing insulation leakage. The electric arc also carbonizes the surface layer of the insulating board, and the carbon traces are scattered all over the surface layer of the insulating board in an irregular dendritic form, damaging the insulation. Therefore, it is stipulated that the insulation board must be manufactured in strict accordance with the process regulations to ensure the surface smoothness, make it not easy to adhere to stains, and have good arc resistance. Before applying the insulating board, the test object shall be tested for resistance to electric leakage trace and arc resistance, and can only be applied after reaching the IA2.5 level and arc resistance standard in China.
2. Avoid working under surface discharge to improve electrical service life.
The insulating plate is used as the insulating medium between the catenary and the ground. In view of the small space under the bridge, the contact wire is likely to contact the insulating plate and cause surface discharge. Epoxy glass fiber reinforced plastic and SMC molding compound have a good linear relationship, while unsaturated polyester glass fiber reinforced plastic has a broken line relationship, but both indicate that the service life of insulating materials will be greatly shortened under strong electric fields (especially under surface discharge). Therefore, in the project, it should be avoided that insulating plates work under surface discharge as much as possible. The catenary suspension structure shall be isolated as much as possible, so that there is an air gap between the catenary and the insulating plate, and secondary insulation is established. At this time, most of the ground voltage of the catenary is applied to the air gap, and the voltage carried on the insulation plate is low. Only when the electric locomotive passes under the bridge, the contact wire is likely to contact the insulation plate for a short time. Therefore, the isolation suspension can effectively prevent surface discharge and prolong the electrical life of the insulation plate.
