Excellent electrical insulation properties, high breakdown voltage, dielectric loss factor is small, can effectively prevent the phenomenon of high-voltage electric field discharge and power loss; good thermal stability and oxidation stability, to prevent the use of the process of acid and sludge, Low viscosity, providing effective cooling and heat transfer and low temperature start-up; low temperature performance, without containing pour point depressant; naphthenic and aromatic hydrocarbon content is appropriate to ensure the dissolution of electrical equipment in the process of running The formation of sludge and to avoid damage to the insulation material and affect heat transfer.