Vapor Phase
Vapor Phase : In the core-type transformer, the core-and-coil assembly is independent of the tank, so that the assembly is allowed to completely dry. When drying the core-and-coil assembly, vapor phase drying method is used, in which special oil vapor is sprayed on the assembly to utilize latent heat produced when the oil vapor condenses. Since heating is effected deep inside evenly and quickly, the assembly can be completely dries without causing damage to the insulation
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