REPAIR / MAINTENANCE OF 33 KV MAIN RECEIVING STATION YARD AND OTHER ALLIED WORKS AT KIRBY UNDER AGE EM I OF GE (U) ELECTRIC SUPPLY, DELHI CANTT-10

M & L for carrying out following Onsite Tests for 33 / 11 KV Transformer of any capacity with required / suitable testing equipment by Qualified and Licensed Personal, Recording Test Results and submitted to GE to keep on record duly signed by all concerned complete all as specified and as directed: [a] IR Test [b] PI [c] Magnetic Balance Test [d] Ratio test [e] Di-electric Test of Oil [f] Short Circuit Test [g] Vector Group [h] Winding Resistance

M & L for dismantling & transporting of Power Transformer including disconnecting the LT / HT Connections, Earthing, Control Cables carefully from the Transformer installed on Foundation of 33 Kirby Grid and Loading the 8/10 or 12.5/16 MVA capacity Transformer by using suitable Crane on to the Transporting Trolley Vehicle, Transporting the unserviceable Transformer on Trolley Vehicle to Workshop from 33 Kirby Grid and after completion of Repairs at Workshop, Transporting the serviceable Transformer on Trolley Vehicle to 33 Kirby Grid from Workshop and unloading and placing it on the Transformer Foundation carefully complete all as specified and as directed. Note: [a] Cranes used for Loading, Unloading of Transformer on to the Transporting Trolley Vehicle and Transformer Foundation shall not be less than 20 Tons. [b] Any damage to insulators / bushes / windings etc. while in the custody of the contractor shall be made good at no extra cost to the Government. The serviceability of the transformer shall be checked and confirmed by the contractor before taking into his custody. [c] M & L for rewinding/re-insulation of HT/LT [Primary/Secondary] Coils, Bushes, Studs, Transformer Oil, Filtration of Oil, Cable Box, replacement of Buchholz Relay/MOG, repair/servicing of OLTC etc. will be measured and paid separately under relevant items

Repair to Power Transformer of 8/10 or 12.5/16 MVA capacity complete all as specified and as directed. [i] Draining out transformer in the suitable capacity of container / drums and keeping it in safe custody for reuse. [ii] Lifting, transporting & handling the transformer to the work shop and opening top cover of the transformer by unscrewing nuts/bolts / washers etc. including disconnecting core assembly from HT / LT bushing and lifting the same gently with the help of crane and taking out from the shell [Container / Body] of the transformer. [iii] Visual inspection of entire Core Assembly, Transformer Tank, Core Limbs, OLTC etc., locating the fault / damages. [iv] Cleaning the transformer body from inside, removing deposited dirt /sludge/foreign particles etc. from the bottom/body of the transformer, cleaning with CTC and drying up the shell from inside before refilling with the Transformer Oil. [v] Cleaning and washing thoroughly core and serviceable windings of the transformer by hosing down with clean dry oil conforming to IS – 336, removing deposited dirt / sludge / foreign particles from the windings / core through inspection of windings, providing insulations to leads and terminals complete and re-assembling the core including newly winded coils etc. [vi] Heating / drying / baking complete carefully and thoroughly inside the heating chamber at suitable temperature to obtain required value of insulation resistance etc all as per IS.

M & L for Painting of Transformer of 8/10 MVA(2 Nos) / 12.5/16 MVA(1 No) Capacity complete with Two Coats of Synthetic enamel paint externally and painting with a coat of Oil Resistant Paint inside the Transformer Shell complete all as specified and as directed.

M & L for overhauling OLTC of 33 KV / 11 KV Transformer of capacity 8/10 MVA (2 Nos) / 12.5/16 MVA( 1 No) by draining out of Transformer Oil, dismantling of top cover, inspection of moving and fixed contacts of all Three Phases and checking the operation, cleaning and removal of contacts of all the Three Phases and checking the operation, cleaning and removal of all carbon particles, Checking the thickness of leads in the OLTC Board, Moving / Fixed Contacts, inspection of Transition Resistance and replacement of Gasket / Contacts etc., if found damaged, reassembling complete, Filling up of Oil, testing complete all as specified and as directed. Note: Spares will be measured and paid separately

M & L for rewinding of HT Tap Winding for 33KV / 11KV Power Transformer (8/10 MVA) having low winding resistance / defective HV Coil [Primary Side] by winding defective coils with new copper wire with Kraft Paper insulation as per IS of same gauge and size together with new insulated materials/bracings before placing in to the transformer and assembling the coil with new insulation materials, varnishing and fitting the coils in the chamber, testing and commissioning the transformer and recording the test results complete all as specified and as directed. Note: M & L for re-insulation of serviceable coils will be measured and paid separately under relevant items of this BoQ. .

M & L for rewinding of HT Tap Winding for 33KV / 11KV Power Transformer (8/10 MVA) having low winding resistance/ defective LV coil (Secondary Side) of by winding defective / low insulated coils with new copper wire with Kraft Paper insulation as per IS of same gauge and size together with new insulated materials/bracings before placing in to the transformer and assembling the coil with new insulation materials, varnishing and fitting the coils in the chamber, testing and commissioning the transformer and recording the test results complete all as specified and as directed. Note: M & L for re-insulation of serviceable coils will be measured and paid separately under relevant items of this BoQ.

M & L for rewinding of HT Tap Winding for 33KV / 11KV Power Transformer (12.5/16 MVA) having low winding resistance / defective HV Coil [Primary Side] by winding defective coils with new copper wire with Kraft Paper insulation as per IS of same gauge and size together with new insulated materials/bracings before placing in to the transformer and assembling the coil with new insulation materials, varnishing and fitting the coils in the chamber, testing and commissioning the transformer and recording the test results complete all as specified and as directed. Note: M & L for re-insulation of serviceable coils will be measured and paid separately under relevant items of this BoQ.

M & L for rewinding of HT Tap Winding for 33KV / 11KV Power Transformer (12.5/16 MVA) having low winding resistance/ defective LV coil (Secondary Side) of by winding defective / low insulated coils with new copper wire with Kraft Paper insulation as per IS of same gauge and size together with new insulated materials/bracings before placing in to the transformer and assembling the coil with new insulation materials, varnishing and fitting the coils in the chamber, testing and commissioning the transformer and recording the test results complete all as specified and as directed. Note: M & L for re-insulation of serviceable coils will be measured and paid separately under relevant items of this BoQ.