REPAIR REWINDING OF CERTAIN TRANSFORMERS VCBS SERVO STABILIZER UNDER GE (ARMY) DHAR ROAD UDHAMPUR

Labour and necessary T&P for disconnecting defective out door/indoor transformers of capacity upto 400 KVA from HT/LT side after taking proper shutdown,disconnecting body and neutral earth connections and taking out complete transformer oil, storing the same in dried containers (to be arranged by the contractor) opening the top cover and lifting the core assembly by means of tripod and chain pulley block carefully to check its condition, refilling the transformer oil after complete dehydration/filtration if required (to be paid separately) and necessary repairs including replacement of worn out nuts, bolts & washers etc, fixing the top cover after housing back entire core & coil assembly and fixing the top cover thereafter complete all as specified and directed by Engineer-in-Charge. Note : (a) Lowering and taking down the same from two /four pole structure / PCC platform to ground & loading on vehicle carefully with the help of telescopic boom crane, steel ropes & winches etc.Unit rate of item shall deemed to be included. (b) In case of major repairs/replacement in transformer which can not be undertaken at site the transformer shall be shifted at civil workshop and the cost shall be paid separately under relevant items. (c) Cost of dehydration/filteration and other necessary repairs shall be measured and paid separately under relevant item. Contractor shall bring the mechanic at site for first inspection of the transformer after that transformer shall be shifted at workshop complete all as directed by Engineer-in-Charge.

Labour, T&P & vehicle for transporting (To & From) the defective transformer for repair to civil workshop, opening top cover of transformer for repair and taking out the burnt HT/LT coil (windings), dismantling HT/LT coils from core & reassembling the core after replacement of burnt HT/LT coils of existing gauge & turns,housing Core & coil assembly with all accessories in transformer body and connecting up to HT/LT bushings, filling in dehydrated transformer oil, testing complete, transporting back the transformer to location/site and reconnecting HT /LT/Earth connections at existing electrical system including testing & commissioning complete on load of following capacities. Note : Following items / spares required to be replaced shall be measured and paid separately (a) Transformer oil (b) Winding of LT/HT Coils (c) Silica Gel/Silica Gel Pot (d) Porcelain bushings / brass studs. (A) 25 KVA to 200 KVA

All as per item No 02 herein before but capacity 250 KVA to 400 KVA

M&L for rewinding of HT/LT coils of transformer as per following specifications including de-moisturizing the prepared coils in heat chambers for adequate duration before assembling the winding and core with double paper insulation for reconditioning only of existing copper strip for LV (0.433 KV) winding having existing size / gauge including necessaory testing in workshop and connection of tap changer after dismantling unserviceable winding wire complete all as specified and as directed by Engineer-in-Charge.(A) Super enameled double paper insulated copper wire for HV (11 KV) winding having existing size / gauge

Shifting of transformer of following capacities in between locations as mentioned against each Dhar Road Garrison Engineer or 16 Corp Power House and back by transportation in safe custody incl loading and unloading from foundation complete all as specified and directed by Engineer-in-Charge. Note :- Rate for hiring of crane/vehicle are deemed to be inculded in quoted rates.(A) 25 KVA to 200 KVA in between Dhar Road Cantt area or 16 Corps and back.

All as per item No 05 here in before but capacity 250 KVA to 400 KVA in between Dhar Road Cantt area or 16 Corps and back.

De-hydration / filtration of transformer oil by hiring on line filtration plant to achieve di-electric strength not less than minimum 60 KV including following work services :- (a) Removal of all suspended particles such as dust, rust, scales, colloid solution of carbon particles sludge etc upto < 1 micron. (b) De-hydration of transformer oil under vaccum. (c) Circulation of heated oil and filling of treated oil in transformer tank. (d) Top up the transformer oil upto the level marked in breather tank. NOTE : (i) Contractor shall use the vehicle mounted filtration plant with suitable size heavy duty hose pipe. (ii) The transformer oil required for replacing/top up shall be measured and paid separately under relevant item of the schedule. (iii) Conducting field testing of di-electric strength of the transformer oil before and after filtration. (iv) Checking the megger / earth resistance values with battery operated megger of 5 KV. (v) Test report for BDV of oil shall be submitted by agency / contractor carrying out filtration.

M&L in replacement for filling / topping of new transformer oil after heating and having di electric strength not less than 60 KV complete all as specified and directed by the Engineer-in-Charge. Note : The transformer oil shall be supplied in sealed barrels of 210 Ltr capacity each of approved make duly marked with IS-335 on barrel. The barrel will be checked in presence of JE, Engineer-in-Charge and contractor for soundness of seal. Test report and purchase voucher shall be brought and produced by contractor before incorporation in work and the copy of the same shall be kept on record duly defaced by the Engineer-in-Charge.

Supply and filling in existing breather by replacing new silica gel of superior quality for air breather of transformer complete all as specified and as directed by the Engineer-in-Charge.

S&F in replacement of breather assembly of Transformer incl silica gel upto 250 KVA transformer as per existing make and type 500 Gm complete all as specified and directed by the Engineer-in-Charge.