Description:
As of now, the most advanced drying technology for power transformer is the vapor phase drying method. Vapor phase drying is the method which applies vacuum but the heating is not through air. In this method the carrier of heat is vapor of low viscosity solvent like kerosene with a sufficiently high flash point instead of air. In vapor phase drying, the vapor is heated in a chamber by the use of electric heaters and is passed over the core coil assembly for drying. The solvent vapors thus condense on the drying mass and are collected back in form of liquid solvent which is recirculated in the system. For this purpose, the vapor phase drying systems have an evaporator and condenser system in addition to the vacuum chamber and vacuum pump system, etc. Vapor phase drying plant is mainly used for 110KV and above large high-voltage EHV transformers, capacitors, and other electrical products
Main Advantages of VPD:
Heating of insulation materials under vacuum — Reduced oxygen levels minimize oxidation and thermal aging of cellulose materials resulting in less loss of life than can be achieved in rapid oven drying or radiation processes.
Excellent heating characteristics of the vapor condensation process — Heat is transferred to all parts of the core and coil assembly uniformly, quickly and more efficiently than can be achieved with hot air or radiation processes, which further reduces thermal aging and loss of insulation life over other drying processes.
Excellent cleaning action — Soluble process materials and contaminants are washed off the core and coil assembly in the vapor phase process which is not possible without condensing vapors.
Most of the technical specifications of the vapor phase drying plant depend on our customer requests. Please contact us with your desired configuration or any questions you might have regarding the VPD plant.
