WORK

The following works are carried out for Replacement of Gaskets of 40MVA T/F-I (BBL make) alongwith other associated Works at 132KV Sub Station Bachhrawan, Raebareli with all Cost of Men, Misc Consumables, Crane / Hydra, Centrifuging Machine, Nomal & Special T&Ps,any other accessory works like cleaning of oil tank (with oil or as required) etc required for satisfactory completion of the Job, as per Technical Specifications & Direction of the Supervising Engineer, as per Details below-

Removal of Jumpers of HV & LV side Bushings of the Transformer. The Scope of Work involves Opening of Bolts & Nuts and Removal of Jumpers, Bushing Clamps etc.

Complete Draining of the T/F Oil from the 40MVA Transformer - 1 into Oil Tanker / Oil Drums andStacking them at Proper Place

Complete Dismantling of the 40MVA T/F as required for Gasket Replacement. The Scope of Work Involves Dismantling of HV LV Neutral Bushings, Turrets, Radiators, Conservator Tank, Explosion Vent Pipe. Buchholz Relay, Oil Pipe Lines. Flanges, Valves, Cooling Fans cc, along with Opening of associated Electrical Connections, Stacking of all the Dismantled Parts at Proper Place in the Switchyard including Proper Blanking of the Open Points before Replacement of Gaskets

Complete Replacement of Gaskets of 40MVA Transformer. The Scope of Work Involves Replacement of Gaskets Removal of old / damaged Rim Gasket of Transformer's Top Cover and old / damaged gaskets of different Parts of the Transformer by Cleaning of Surfaces, Providing & Fabrication of Gaskcts out of good Quality Rubberized Cork Sheet Gaskets of Konica Troborze / Nu-Cork make having Temperature Bearing Capacity around 380'C and Fixing the Gaskets with Adhesive at Rim & other Surfaces including Bushing 'O' Rings etc. as per requirement.

Cleaning of Transformer's Core and Winding by Hot Transformer Oil and Removing the Complete Sludge from Bottom by Hot oil Flushing with Centrifugine Machine

Complete Erection of 40MVA Transformer - 1 by Erection of HV / LV /Neutral Bushings, Turets, Radiators, Conservator Tank, Explosion Vent Pipe, Buchholz Relay, Oil Pipe Lines Flanges, Valves, Cooling Fans etc. at its original Place. Complete Evacuation of Main Tank of the Transformer and filling of Dry Nitrogen / Dry Air of Dew Point -50'C or better in Vacuum upto Pressure of 0.25K g/cm' and the again Evacuating the Transformer Tank after Required Time Interval (approx, 12 Hrs.) using Centrifuging Machine. The Scope of Work Involves Measuring Due Point Values of N2 after every Cycle till the Required Value is achieved

Centrifuging of Oil filled in oil Tanker, Un-Interrupted till the desired BDV Value of the Achiraved Oil is Achieved, Filling of Transformer 0il into Main Tank and Radiators from Oil Tanker, then Centrifuging & Circulation of the Oil in Transforer, Un-Interupted till the Desired BDV Values of the Oil & IR Values are Achieved including Recording of all the Parameters such as Temperature, Vacuum, Insulation Resistance etc. every 2 Hours. Centrifuging Machine, its Operator, all associated T&Ps etc. shall be Arranged by the Contractor at his own cost

Jumpering of HV & LV side Bushings of the Transformer. The Scope of Work Involves Fixing &e Tightening of Bushing Clamps with appropriate size Bolts - Nuts - Washers including Replacement of Clamps, Jumpers etc. as Required

Outside Complete Spray Painting of above 40MVA Transformer including its Main Tank, Main / OLTC Conservator Tanks, Radiators, Headers, associated Pipe Lines, Support Structures, Marshalling Box etc. by 1 coat of Red Oxide Primer and then applying 2 coats of Smoke Grey Colour 1" Quality Synthctic Enamcl Paint of Asian / Berger / Nerolac make at the Gap of 48 Hrs. Interval each with the help of Spray Painting Machine afer due Rubbing & Cleaning of the Rusted Surfaccs, CIeaning & Washing of Dust / Dirt /oil Deposits.

Carriage of 20 KL oil tank from 220 KV S/S Bachhrawan/132 KV S/S Salon to 132 KV S/S Bachhrawan, Raebareli for purpose of storing of oil after draining from T/F including cost of loading / unloading / transportation/ truck/fuel/driver and any other T&P as required for carriage work.

Supply & Erection of flexible air separator (Aircell) for the conservator tank of 40 MVA T/F-I (BBL make), size of conservator tank length-2450 mm & diameter-925mm/as per site requirement.

Supply and fixing of New Magnetic Oil Gauge (MOG) of sukrut/standard make, Range : Min 30 degree, 1/2, 3/4, Max dia as per sample suitable for 40 MVA T/F BBL make

Supply and fixing of New clear view type Silica Gel Breather conforming to IS:3401:1992/latest standards of reputed make size 8-10 KG capacity for Main Tank , Range as per sample suitable for 40 MVA T/F BBL make

Supply and fixing of New clear view type Silica Gel Breather conforming to IS:3401:1992/latest standards of reputed make size 2-3.5 KG capacity for OLTC, Range as per sample suitable for 40 MVA T/F BBL make

Complete blanking of pipe line and radiators by blanking plates and other associated works to make transformer ready for vacuum.

Complete evacuation of main tank of transformer and filling of Nitrogen in vacuum upto pressure of 0.25 kg/cm2 and again evacuating the transformer tank after required time interval using centrifuging machine. Scope of work involves providing N2 cylinders, to and fro carriage from factory on own cost and measuring due point values of N2 after every cycle till the required value is achieved.

Performing the Vacuum Stand Test. The scope of work involves to create the vacuum inside transformer upto 760 Hg mm for evacuation of moisture from the core and winding and maintening the pressure atleast for 72 Hrs.

Filling of transformer oil into main tank and radiators from oil tanks under vacuum after performing the Vacuum Stand Test successfully as per above

Conducting testing by NABL Lab /CPRI etc. arranging appropriate equipment in following testing. 1. Electric Strength- Break Down Voltage (BDV) 2. Dissolved Gas Analysis (DGA) 3. Tan Delta 4. Water Content(PPM)