The SG (B) 10 non-encapsulated Class H dry transformer is an insulation system based on insulating paper. Excellent electrical and mechanical properties are maintained throughout the service life of the transformer. The insulation paper is not easy to age, the shrink resistant agent is anti-compression, and the elasticity is very strong, so it can ensure that the coil of the transformer remains tight in structure even after several years of use, and can withstand the pressure of short circuit.