Replacement of Gaskets of 20 MVA Transformer KANOHAR make installed at 132 KV S/S Lalganj under ETD-Mirzapur

Amount

Following works are to be carried out for the work of replacement of complete gaskets of 20 MVA Transformer “KANOHAR” make at 132KV S/S Lalganj with all cost of men, Material, T&P as per technical specifications for proper completion of the work with safety

Opening of jumpers of HV/LV side, removal of earthing strip from bushing at 132 KV S/S Lalganj.

Dismantling of 20 MVA T/F accessories including radiator, bushing, bucholz relay, oil pipe line from conservator tank to main tank, oil pipe line to PLTC and surge relay conservator tank at 132 KV S/S Lalganj.

Complete drain out of T/F oil from the existing 20 MVA T/F into empty oil drums/oil tanker and storage/designated place for storage.

Replacement of all the gaskets including the top cover, PRV, Bucholz, Valve of T/F by proving and fixing of new gaskets as per existing size made of rubberized cork sheet Kotika/Turboze/Nu cork brand grade 07 after due fabrication.

Cleaning of Core and winding by T/F oil removed the slug from bottom of the main tank.

Overhauling of diverter switch, removal the diverter switch from chamber cleaning by hot Oil, removed the dirty oil and proper cleaning and fixing in original shape.

Applying vacuum to above transformer up to 760mm of Hg for 24 Hrs. and adequate capacity vacuum pumps after necessary blanking/erection as per requirement.

Filling of dry nitrogen gas having Dew Point(-)60C to (-)65C under vacuum from top value of the transformer upto pressure of 3 PSI and maintaining the same in the main tank for 12 Hrs. including cost of Nitrogen gas and nitrogen gas filling device.

Creating the Vacuum inside the Main tank for period for 12 Hrs. and filling of centrifuged new T/F oil in main tank of required BDV after preparation in 20 KL oil tanker

Complete, erection of 20 MVA T/F by erection of radiator, conservator tank, bushing with its turrets (if available ) connecting of all oil pipe line, erection of cooling fans making control cables connection, bucholz relay etc. For completing the work, toppling of T/F oil and final oil filling in tank, radiator, conservator tank and final oil filling in tank, radiator, conservator tank and all other associates work for complete of work.

Centrifuging of complete T/F oil in T/F by connecting centrifuging pipe circulating the T/F oil through centrifuging machine to be provided by the Contractor and taking the BDV value of the periodically till the required value is achieved as per direction of supervising engineer and also measurement of PPM all labour, T&P, centrifuging machine shall be provided by contractor at his own cost.

Replacement of bucholz valve

Transformer oil testing after centrifuging of oil from NABL Accredited Lab. Including BDV,PPM,DGA, etc. as per IS:1866 along with necessary carriage of sample in Steel Sampling bottle at Lab

Overhauling of OLTC

RISHAB OIL RECLAIMATION PRIVETE LIMITED

Omurmila Constructions

Preeti Enterprises