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What are the Insulation Grades of Transformer Epoxy Resin Boards?

What are the insulation grades of tranformer epoxy resin boards?
The relationship between the temperature of the tranformer epoxy resin boards and the insulation temperature grade: According to the degree of heat resistance, the insulation material is divided into grades such as Y, A, E, B, F, H, and C. For example, the highest permitted operating temperature of Class A insulation materials is 105 ° C. Most of the insulation materials used in distribution transformers and motors are classified as Class A, such as epoxy insulation boards. Insulation temperature class A Class E Class B Class F Class H The highest allowable temperature (℃) 105 120 130 155 180 Winding temperature rise limit (K) 60 75 80 100 125 Function reference temperature (℃) 80 95 100 120 145c

What are the application characteristics of tranformer epoxy resin boards?
1. Mechanical function of tranformer epoxy resin boards. The cured epoxy resin system has excellent mechanical functions.
2, curing is convenient of tranformer epoxy resin boards. By using different curing agents, the epoxy resin system can be cured at a temperature scale of 0 ~ 180 ℃.
3. There are various ways of tranformer epoxy resin boards. Various resins, curing agents, and modifier systems can be used to the requirements of various applications, and their scale can range from extremely low viscosity to high melting solids.
4. Strong adhesion of tranformer epoxy resin boards. The presence of polar hydroxyl groups and ether bonds in the epoxy resin molecular chain makes it highly adhesive to various substances. Epoxy resins have low shortening properties during curing and low internal stress, which also helps to improve adhesion strength.
5. Short shortening of tranformer epoxy resin boards. The reaction between the epoxy resin and the curing agent used is through the direct addition reaction or the ring-opening polymerization reaction of epoxy groups in the resin molecule, and no water or other volatile by-products are emitted. Compared with unsaturated polyester resins and phenolic resins, they show very low shortening (less than 2%) during curing.

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