The core and coil assembly with respective connections is dried in vacuum oven for a pre determined oven cycle based on insulation structure, At a vacuum level up to 1 torr@100C temperature, Which eliminates complete moisture from insulation material and also use of Micro processor based temperature for controller to record Temperature for controller to record Temperature v/s time for improvement of insulation resistance values.
The dried core coil assembly is boxed up in a pre fabricated M.S. Tank which is painted with a hot transformer oil resistant paint, The tanks are fabricated with mild steel procured from reputed firms.
Tanks are electrically welded with adequate sheet thickness and suitable stiffeners are provided to withstand operational and sudden pressures. Cooling is achieved by pressed steel radiators.
Tanks are short blasted before applying a premier coat of paint, External surface can also be zinc sprayed on request and sprayed with two coats of gray weather resistant, Epoxy finish paint highly resistant to chemicals and oil. Transformers can be hermetically sealed or breathing type with conservator.
The finished transformer is offered for routine testing as per relevant standards. All the transformers are routine tested with relevant standard/customer specifications are conducted. All the transformers are Pressure Tested at a positive pressure of 6 PSI for a period of 16 hours and the job is finished and kept ready for dispatch after application of final painting as per requirement.