Transformer leak arresting and oil filtering in Phase-2 plants, FACT-CD

Transformer leak arresting and oil filtering in Phase-2 plants, FACT-CD.

Leak arresting of 2/1.5 MVA, 11kV/415V Transformers in phase-2 plants. The scope of work includes disconnection of HT/LT cable/ bus duct of transformer if necessary; draining of oil to suitable oil levels; opening inspection covers; opening top covers; replacement of gaskets of HT and LT bushings, top cover, drain plugs, inspection covers, terminal box covers, tap changer, neutral bushes, conservator lines, buchholze relays, connection to cooling fins, oil valves flanges etc. with new ones; removing sludges in the tank; washing the core and winding with filtered oil; refixing the dismantled parts; checking the tightness of all connections; refilling of oil via circulation after vacuum filtration to improve BDV required; inspection of any oil leak after the work and rectifying if so and charging of the transformer. Transformer oil required for topping up the oil level shall be supplied by FACT at free of cost. Metal parts shall be throughly cleaned and adhesives shall be applied before fixing the gaskets. Adhesives and Gaskets of suitable thickness (minimum 10mm)/size required for executing the work shall be supplied by the contractor. All necessary tools and equipments like oil filter, vacuum pump, oil storage drum etc. required for the work shall be brought by contractor.

Gasket replacement of HT bushing. The scope of work includes opening primary terminal box, primary cable disconnection, gasket replacement of Primary side (11kV) bushing/Adaptor box/primary terminal box cover and cable re-connection of 2/1.5 MVA, 11kV/415V transformers in phase-2 plants. Metal parts shall be throughly cleaned and adhesives shall be applied before fixing the gaskets. Adhesives and Gaskets of suitable thickness (minimum 10mm)/size required for executing the work shall be supplied by the contractor.

Gasket replacement of Buchholz relays. The scope of work includes gasket replacement of buchholz relays of 2/1.5 MVA, 11kV/415V transformers in phase-2 plants. Metal parts shall be throughly cleaned and adhesives shall be applied before fixing the gaskets. Adhesives and Gaskets of suitable thickness (minimum 10mm)/size required for executing the work shall be supplied by the contractor.

Transformer oil purification of Power Transformers rated up to 7 MVA in phase-2 plants. The scope of work includes primary inspection of transformer after isolation; arranging, connecting and operating high capacity vacuum transformer oil filter machine with required accessories; filtering old oil to reach the required BDV; rectification of any oil leaks developed in course of oil filtration (gaskets required for leak arresting is in contractor's scope);testing of oil as per the ISO standards, pre commissioning checks and charging of the transformer. All necessary tools and equipments like oil filter, vacuum pump, oil storage drum etc. required for the work shall be brought by contractor. Supply of new oil for top-up/replacement is in FACT's scope.