Insulation Materials One Of The Important Materials
Insulating material is one of the most important materials in transformer, its performance and quality directly affect the reliability of transformer operation and the service life of transformer. In recent years, Insulation Materials new insulating materials used in transformer products are emerging.
With the rapid development of science and technology, electrical equipment such as electric machines and transformers are widely used. The reliability and service life of the transformer depends on the insulating material used in a large extent. Insulating materials are becoming more and more important for the transformer design and manufacture.
In recent 20 years, new products, new technologies and new theories of transformer insulating materials have sprung up and developed, thus making transformer insulating materials and their applications become a very important subject.
1. Introduction to insulating materials
Insulating material, also known as dielectric, is a material with high resistivity and low conductivity. Insulating material can be used for isolating electric or different potential conductors, so that the current flows in a certain direction. In the transformer product, Insulation Materials the insulating material also plays the role of heat dissipation, cooling, bracing, fixing, arc extinguishing, improving potential gradient, moistureproof, mildew-proof and protecting conductor.
Insulating materials are classified by voltage grade: generally divided into: Y (90 Shan), a (105), E (120 Shan), B (130 Shan), F (155 Shan), H (180 Shan), C (greater than 180 Shan).
The heat-resisting grade of transformer insulating material refers to the maximum temperature that the insulating material is allowed to withstand in the transformer. Insulation Materials If you use insulating material correctly, you can guarantee the life of the material for 20 years. Otherwise, it will be based on 8 Shan law (A-class insulation temperature of 8 Shan per rise, the service life of the lower half, B-class insulation is 10 Shan, H-Class is 12 Shan. This rule is known as the 8 Shan rule of thermal aging, which reduces service life. The heat resistance of the insulating material composed of polymers is lower than that of the electromechanical medium. The properties of insulating materials are closely related to their molecular composition and molecular structure.
Transformer insulation materials are many varieties, according to its shape generally can be divided into gas insulation materials, liquid insulating materials and solid insulating materials.
2, the transformer insulation material electrical performance four basic parameters.
The four basic parameters of electrical properties of transformer insulating materials include insulation resistance, dielectric coefficient, dielectric loss factor and insulation strength.