25-ETC-I(A)/ 2025-2026

Amount

FOLLOWING WORK OF REPLACEMENT OF GASKET FOR ATTENDING THE OIL LEAKAGE OF 220/132KV, 160 MVA T/F-II (Make-Bharat Bijlee (BBL), Year-2010) at 220 kV S/S Sangipur Pratapgarh is to be done as per the details given below:

Safe to and fro transportation of 50 KL oil tank from 220 KV S/S Sirathu, Kaushambi to 220 KV S/S Sangipur having distance approx 100 KMs. Works includes shifting and loading of oil tank with the help of Hydra/Crane at other UPPTCL substation, safe transportation and unloading of it at working site near 160 MVA T/F-II at 220 KV S/S Sangipur with the help of hydra.

Dismantling & safe stacking of Mulsifyre air pipe line, water pipe line at proper place in the switchyard as per the instrcution of JE/SDO.

Drain out of the T/F oil from 160 MVA T/F-II tank into empty oil drums/Oil tanker including opening of drain valve with proper precaution and filling in empty oil drums and then proper stacking.

Dismantling of 160 MVA T/F-II HV/ LV/TV/Neutral Bushing and its Turret , opening of all pipe line 6'', 4'' & 2'' inlet, Outlet valve , diverter switch, inspection cover, Buchholz relay, PRV relay for replacement of gasket.

Providing and making of bottom cover gasket of 160 MVA T/F-II after opening of nuts & bolts removal of damaged gasket, cleaning of bottom surface & making new gasket and its proper fixing.

Replacement of old and damage gasket of 160 MVA T/F-II make of good quality rubberized cork sheet Kotika/Telbroze/NE Cork make as per following details below.

Providing and making of HV Turret Gasket.

Providing and making of HV bushing gasket.

Providing and making of LV Turret Gasket.

Providing and making of OLTC TOP PLATE Gasket.

Providing and making of Radiator Gasket.

Providing and making of Radiator Value Gasket.

Providing and making of header gasket.

Providing and making of Inspection Plate TV Turret Gasket.

Providing and making of Inspection Plate NV Turret Gasket.

Providing and making of LV bushing gasket.

Providing and making of gasket of inspection cover.

Providing and making of gasket of 6”Butterfly valve.

Providing and making of Radiator pipe line 6" dia

Providing and making of C.T. inspection cover HV/ LV.

Providing and making of C.T. inspection cover TV

Providing and making of C.T. inspection cover Neutral

Providing and making of 1” Dia pipe line Gasket.

Providing and making of Surge Relay gasket.

Providing and making of Gasket Buchholz Relay.

Providing and making of gasket of PRV

Providing and making of Top rubber ball of TV Bushing

Providing and making of TV Bushing gasket.

Providing and making of N Bushing gasket.

Providing and making of gasket of oil pump

Providing and making of gasket 3" dia valve.

Providing and making of nylon washer of radiator, Bushing, Air releasing plugs.

Replacement of different nut & bolts of main tank oil pipe line

Providing and making of 1” dia Valve gasket.

Providing and making of 2” dia Valve gasket.

Providing and making of gasket all WTI/OTI pocket.

Providing and making of gasket of OLTC tank

Providing and making of gasket of MOG

Erection of turret HV/LV/TV side and erection of bushing, oil pipe line ,Gear box, OLTC pipe line, Pump, Flow meter, Inspection Cover etc. for complete of the work.

Complete evacuation of 160 MVA T/F-II main tank and filling of Dry Air/ Dry Nitrogen of dew point -500 C or better in vacuum up to pressure of 0.25Kg/cm2 and again evacuating the Transformer Tank after required time interval (approx. 12/24 Hrs) using centrifuging machine. The work shall include connecting pipe of machine as required and measuring Due Point values of N2 after every cycle till the required value is achieved. Dew point meter shall be arranged by the contractor.The above work involves minimum 3 Cycle of evacuation and 03 cycle of N2 filling and if results are not in order then 01 more cycle of evacuation of and N2 filling will be done by the contractor by performing the the Vacuum stand test. The scope of work involves creating the vacuum inside the 160MVA TF-I upto -760mm of Hg for evacuation of moisture from core & winding & maintaining the pressure at least for 48/72 Hrs.

Create the vacuum inside the tank & filling the T/F oil.

Cleaning and 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.

Centrifuging of T/F Oil storage tank , un-interrupted till the desired BDV & PPM Value of the oil is achieved and then filling and topping up of the centifuged T/F oil in T/F as per standard procedure to maintain required oil level in the T/F including commissioning of air cell if required centrifuging and circulation of T/F oil in Transformer, un-iterrupted till the desired BDV & PPM value of the oil & IR values of bushing are achieved including hourly recording all the parameter such as temperature. Vaccum insulation resistance etc. Centrifuging machine, its operator and all associated T&Ps shall be arranged by the contractor at his own cost.

Erection of mulsifire system air/water pipe line proper replacement of gasket and Tightening nut and bolts.

Pre-Charging testing of transformer, as per standard technical specifications with duly calibrated testing instrument, as required by the transformer manufacture along with prepration and submission of test-reports, including but not limited to following test: 1. Winding Resistance Measurement 2. Turns Ratio Measurement 3. Tan-Delta Measurement of Winding and Bushings

Sampling and testing of transformer oil at CPRI or any other NABL accredited testing lab including cost of transportation of each sample in standard sampling bottles (adequate number of bottles to be arranged by contractor). Samples to be taken at required intervals (as per actual requirement)- Following tests are to be conducted for eaeh sample- 1.Breakdown voltage 2. Moisture Content, 3. Dissolved Gas Analysis.

Technocrat Electrical (BID ID -5706993)