CA NO CWE/CHM(U)-16/2021-22 REPAIR / MAINT OF TRANSFORMER OF DIFFERENT CAPACITIES AND CONNECTED ITEMS OF WORKS AT VARIOUS LOCATIONS

Amount

Disconnecting HT and LT supply & earthing connections, taking down the defective transformer (Indoor/outdoor type) from four pole/two pole structure or lifting from the outdoor type foundation or taking out from sub station bldg , using a crane of suitable capacity & slings/ropes etc as required and shifting the same to civil workshop for repairs complete all as directed for transformer capacity up to 200 KVA.

All as per item No 1 here in before but capacity from 250 KVA to 400 KVA.

All as per item No 1 here in before but capacity from 500 KVA to 750 KVA.

Shifting back the repaired transformer (Indoor/outdoor type) from civil workshop to site , reinstalling at original position and fixing properly on four pole/two pole structure or outdoor type foundation or inside a sub station bldg , using a crane of suitable capacity & slings/ropes etc as required, making HT/LT supply & earthing connections and testing for satisfatorily working complete all as directed for transformer capacity up to 200 KVA.

All as per item No 4 here in before but capacity from 250 KVA to 400 KVA.

All as per item No 4 here in before but capacity from 500 KVA to 750 KVA. Note for item No 1 to 6. 1.Proper Record of transformer taken to work shop and shiffted back to site after repair shall be maintainted duly mentioining SM/MES No/Ser No. 2. Contractor shall ensure that the transformer taken out to work shop shall be shiffted back to site duly repaired within 14 days from the date of issue. A penality of Rs 2000/- per day per transformer shall be imposed after 14 days in case of failure.

Draining out complete transformer oil from the transformer & storing the same in suitable containers ( to be arranged by contractor without any extra cost ) , opening the top cover and lifting up the core assembly carefully to check the condition of transformer windings and core, retanking the same after repairing , checking of leakage from transformer body and repairing/welding works required for making transformer body leak proof, refilling the transformer oil dully dehydrated and filtered (dehydration and filteration to be paid separately) & making all connections with HT/LT side bushings , refixing the top cover , and testing the transformer with a suitable capacity insulation tester complete all as directed for transformer capacity up to 200 KVA.

All as per item No 7 here in before but capacity from 250 KVA to 400 KVA.

All as per item No 7 here in before but capacity from 500 KVA to 750 KVA. Note for itm No 7 to 9 :- [a] All repair works such as rewinding, core repairing, oil filling, bushings, terminal rods, gaskets, valves etc shall be measured and paid separately.

M & L for rewinding of burnt out /defective HT coils with new super enamelled heavy duty copper winding wires of size matching to the existing one including varnishing, drying in a suitable oven and all insulating material such as cotton/glass sleeves,tapes etc and connections with bushing terminals complete all as specified & directed.

M & L for rewinding of burnt out /defective LT coils with new super enamelled heavy duty copper winding wires of size matching to the existing one including varnishing, drying in a suitable oven and all insulating material such as cotton sleeves, tapes etc and connections bushing terminals complete all as specified & directed.

M & L for rewinding of burnt out /defective HT coils with new super enamelled heavy duty aluminium winding wires of size matching to the existing one including varnishing, drying in a suitable oven and all insulating material such as cotton/glass sleeves,tapes etc and connections with bushing terminals complete all as specified & directed.

M & L for rewinding of burnt out /defective LT coils with new super enamelled heavy duty aluminium winding wires of size matching to the existing one including varnishing, drying in a suitable oven and all insulating material such as cotton sleeves, tapes etc and connections bushing terminals complete all as specified & directed.

M & L for recondiotioning of complete core assembly for improving the insulation value by cleaning the LT/HT windings, varnishing properly, replacing sleeve insulations, remaking all connections properly, drying the core assembly in a suitable heat oven complete all as directed for transformer capacity up to 750 KVA. Note for item Nos 10 to 14. Engr-in-charge shall invariably render a certificate (in MB in support of work executed under these items) for i.e. the correctness of winding wire incorprated in the work.

M & L for replacement of HT tap changer off load type, of suitable size with tapping arrangement from (+/-) 2.5%to 7.5% and one normal tapping including connecting up with HT coil and testing for transformer capacity up to 200 KVA complete all as specified & directed.

All as per item No 15 here-in-before but for capacity 250 to 400 KVA.

All as per item No 15 here-in-before but for capacity 500 to 750 KVA.

M & L for replacement of defective HT porcelain bushing of suitable size for transformer upto 200 KVA including washers of good quality complete all as specified & directed.

All as per item No 18 here-in-before but for capacity 250 to 400 KVA.

All as per item No 18 here-in-before but for capacity 500 to 750 KVA.

M & L for replacement of defective LT porcelain bushing of suitable size for transformer upto 200 KVA including washers of good quality complete all as specified & directed.

All as per item No 21 here-in-before but for capacity 250 to 400 KVA.

All as per item No 21 here-in-before but for capacity 500 to 750 KVA.

M & L for replacement of worn out HT bush rod made out of copper with brass nuts and washers of required length including connecting up with HT coil of transformer upto 200 KVA complete all as specified & directed.

All as per item No 24 here-in-before but for capacity 250 to 400 KVA.

All as per item No 24 here-in-before but for capacity 500 to 750 KVA.

M & L for replacement of worn out LT bush rod made out of copper with brass nuts and washers of required length including connecting up with LT coil of transformer upto 200 KVA complete all as specified & directed.

All as per item No 27 here-in-before but for capacity 250 to 400 KVA.

All as per item No 27 here-in-before but for capacity 500 to 750 KVA.

Supply and filling as in replacement of superior quality silica jel inside the breather assembly and fixing properly with transformer complete all as specified & directed.

M & L for disconnecting from the transformer/panel board, cutting off worn out aluminium cable end, supply and fixing of new aluminium cable lugs , connecting the cable with transfrormer/panel including insulation tapes etc for 95 sqmm to 150 sqmm 3.5 core sizes of LT cables complete all as specified & directed.

All as above per item No 31 here-in-before but size 185 sqmm to 240 sqmm .

All as above per item No 31 here-in-before but size 300 sqmm to 400 sqmm.

All as above per item No 31 above but size 500 sqmm to 630 sqmm.

Dehydration and filteration of transformer oil for indoor/outdoor type transformers of any capacity, at site using transformer oil filteration plant to improve di-electric strength not less than 45 KV at 2.5 mm electrode gap complete all as directed. Note :- Unit rate quoted shall be deemed to include the charges for hiring of oil filteration plant, shifting to different locations at cantt area, testing of samples of oil as per requirement & nothing extra will be paid on this account.

Supply & filling new transformer oil for replacement or topping up the level of oil having dielectric strength not less than 45 conforming to relevant IS-335 complete all as specified & directed. Note. Transformer oil to be supplied in sealed container.

M & L for preparation of external portion of indoor/outdoor type transformer/ tank/conervator/radiator/valves etc) for repainting by removing old paint/oily patches by scrubbing and cleaning dust free, painting with two coats of superior quality synthetic enamelled paint of approved shade complete including cleaning name plate/insulators/conservator level indicator paint free & incl writing of MES /SM No with white paint after painting complete complete all as directed for capacity up to 200 KVA. Note:- The painting of transformer shall be carried out in situ ie. on four pole/two pole structures or kept on foundation or kept inside sub station at different places at cantt area.

All as per item No 37 here in before but for capacity from 250 KVA to 400 KVA.

All as per item No 37 here in before but for capacity from 500 KVA to 750 KVA.

M & L for replacement of transformer core built up of silicon steel cold rolled with hot - oil proof grain oriented laminations of varnish or carlite, insulation on both sides complete all as specified & directed .

Shifting of transformer of any type and any capaqcity up to 750 KVA, using hydra/crane etc of suitable size from existing pole structure/plinth/store yard/from inside of a sub stn bldg and fixing on another pole structure/plinth/store yard/sub stn bldg including necessary connections of earthings and on HT and LT side complete all as specified & directed.

Supply, laying, jointing and testing in trenches/ducts/fixing along the poles/ passing through pipe/ laid under floors etc XLPE insulated , screened PVC bedded, galvanised steel strip armoured, heavy duty HT power cables ISI marked with aluminium conductor, cross sectional area 95 sqmm 3 core, 11 KV earthed, complete all as specified & directed.

All as per item No 42 here-in-before but size185 sqmm 3 core.

All as per item No 42 here-in-before but size 240 sqmm 3 core.

S & F in replacement indoor type heat shrinkable end joint for 11 KV HT cable of size 95 sqmm 3 core complete all as specified & directed.

All as per item No 45 here-in-before but size 120 to 185 sqmm 3 core.

All as per item No 45 above but size 240 sqmm 3 core.

S & F in replacement outdoor type heat shrinkable end joint for 11 KV HT cable of size 95 sqmm 3 core complete all as specified & directed.

All as per item No 48 here-in-before but size 120 to 185 sqmm 3 core.

All as per item No 48 here-in-before but size 240 sqmm 3 core.

Finding of fault to 11 KV UG cable with suitable fault locator equipment & pin point the fault in the faulty cable including necessary excavation and earth work for exposing the faulty portion of the UG cable complete all as specified and directed. Note: Engr-in-charge shall invariably be record the measuring in MB duly draw the sketch with date and location.

S & F HT straight through heat shrinkable type cable jointing kit for 11 KV grade, XLPE cable of size 95 sqmm 3 core complete all as specified.

All as per item No 52 here in before but of size 120 to 185 Sqmm, 3 core complete all as specified.

All as per item No 52 here in before but of size 240 sqmm, 3 core complete all as specified.

Excavation in trenches n. exc. 1.5 mtr width n.exc 1.5 mtr in depth for laying of cables & foundation of poles, stay assembly etc and getting out in any type of soil complete all as specified & directed by Engr -in-Charge.

All as per item No 55 here-in-before but depth exe 1.5 mtr and not exe 3.0 mtr.

Returning, filling in including spreading levelling , watering and well ramming in layers not exc. 25cm in any type soil complete all as specified & directed by Engr -in-Charge.

Removing of surplus excavated soil to a distance not exc. 50m and depositing where directed at a level not exc 1.5 Mtr above the starting point complete all as specified & directed by Engr -in-Charge.

Supply and filling clean dry sand (unwashed) in trenches under and around the cable for cushioning all as specified and directed by Engr-in-Charge.

Supplying and laying un-reinforced precast concrete cable cover, class HV, type 1 flat , size 300mm x 180mm x 40mm complete all as directed.

S & F in repairs clear view type type silica gel breather of suitable size for transformer capacity upto 250 KVA complete all as specified & directed.

All as per item No 61 here in before but for capacity 300 KVA to 750 KVA.

S & F in repairs transformer oil temperature gauge 0 -120 degree analogue dial type complete all as specified & directed.

M & L for rectifying and arresting the oil leakage of transformer of any type (indoor/outdoor) and capacity up to 315 KVA installed inside sub stn bldg or on open foundation or on four pole/two pole structure , disconnection of cables of HT & LT ends , opening the top cover by using tripod/chain and pulley after removing all fitments, replacing the worn out gaskets, "O" rings, etc and rectify the leaks in a variety of areas such as top cover, radiator joints, flanges, valves, conservator, oil leakage through pin hole / crack joint , drain valve / radiator valve ,HT/LT bushes, oil leakages through any gasket joints. Applying putty/M-Seal etc where ever necessary. Refixing the top cover and all fitments, refixing cablesat HT & LT ends and testing for proper working complete all as directed. NOTE : (i) Contractor shall be provide necessary tripod, chain & pulley, T&P, etc and the rent shall deemed to be included in the quoted rate. (ii) Cost of all type of gasket, "O" rings, putty/M-Seal Monoplast, lugs, nut bolt, double washers, etc shall deemed to be included in the quoted rate.

All as per item No 64 here in before but transformer capacity 400 to 750 KVA.

Cutting wild grass,bushes shrubs etc and cleaning of area/yard of sub station buildings complete all as directed by Engr-in-Charge.

M & L PCC 1:4:8 type D-2 using 40 mm graded crushed stone aggregate as in pole foundations etc complete all as specified.

M & L PCC 1:3:6 type C-2 using 40 mm graded crushed stone aggregate in foundation filling & mass concrete for poles/struts/stays assembly or foundation work, including provision of necessary form work complete all as specified.

M & L PCC 1:2:4 type B-1 using 20 mm graded crushed stone aggregate in pole / strut coping or foundation work including provision of necessary form work complete all as specified.

S & F in repairs HT / LT side connection box covers made of bakelite sheet 6 mm thickness with proper nuts bolts incl cutting sheet to required size , drilling holes for nuts/bolts etc complete all as specified and directed.

S & F steel tubular swaged poles complete with mild steel base plate, closed at top as specified, type 410 SP-55 (11 metre long) including painting with two coats of black bitumonous paint externally up to the planted depth and internally through out and remaining external portion with two coats of aluminium paint , over a coat of red oxide primer complete all as specified. NOTE: Excavation & earthwork, foundation concrete will be meaured & paid for separately under respective item(s).

S & F in replacement cross arms, bracings, supports, clamps , anticlimbing devices and back plates etc fabricated from structural steel section including nuts, bolts , washers, welding, bending ( cold or hot ) drilling holes for bolts bent to any shape or size as indicated or directed inclusive of one primer coat of red oxide zinc chromate one under coat and one finishing coat of aluminium paint complete all as directed.

M&L for earthing complete with galvanised steel earth plate electrode 60x60cmx6 mm thick burried directly in ground (earth pit not less than 2.25 Mtr deep below ground level) with top edge of the plate not less than 1.5 Mtr below normal ground level, connected to galvanised earth lead strip 32x6mm by means of bolts, nuts, check nuts and washers of GI or steel all as shown in electrical plate No. 3 of SSR Part-I 2009 connected to earthing test point all as specified or indicated and testing on completion as directed by the Engineer-in-Charge including necessary excavation & earth work in any type of soil, funnel, PCC chamber (1 : 3 : 6) type C1, CI pit cover and frame , charcol, salt including earth lead protected by 40 mm dia medium grade GI pipe and 20mm dia medium grade GI Pipe for watering complete. Note :- Earth lead strip 32 x 6 mm and GI 40 mm dia protecion pipe upto 7.5 mtr length will be deemed to include in the unit rate quoted.

S&F in repairs drain out/filling in oil valve screwed both ends with iron wheel head suitable for transformers up to 750 KVA capacity complete all as directed.

M & L steel tubes 100 mm bore light grade galvanized fixed for cable protection on poles/walls/under road/culvert etc complete all as directed.

M & L steel tubes 80 mm bore light grade galvanized fixed for cable protection on poles/walls/under road/culvert etc complete all as directed.

S & F in replacement , gang operated air break switches,( GO & DO assembly) triple pole, manually operated verticle isolation, mounted on insulators and steel frame, 12 insulators type ,with operating mechanism worked from ground level for rating 200 Amps, 11000 volts complete with GI operating pipe of heavy duty grade of suitable length complete all as specified and directed.

S & F in replacement lightening arrestors expulsion type 11 KV grade complete with all fittings, transmission class, discharge capacity 65 kilo amp complete all as directed.

M & L in repairs pin type insulator porcelain, vitreous white/brown including one galvanised MS spindle nut and two GI washers of size 150mm height, 150mm dia for 11000 volts complete all as directed.

M & L for shifting of standby trolley mounted transformer of capacity 500 KVA including HT / LT cable from one location to another location inside the cantt area by using toeing vehicle and crane if necessary. Connecting the HT / LT cable of the trolley mounted transformer with the existing system connecting the transformer with body and neutral earth with existing earth lead and testing for proper working all as directed. NOTE : (i) Rent of toeing vehicle, labour used, tools used etc shall deemed to be included in the quoted rate. (v) Contractor shall take care of transformer while shifting, any damage occured during the progress of the work while shifting will be rectified by the contractor at his own cost.

Supply, laying, jointing and testing LT underground cable XLPE insulated , PVC sheathed, armoured heavy duty and 1100 volts grade with multistranded aluminium conductor of size 300 sqmm 3.5 core in trenches/ducts/through pipes/under culverts etc complete all as specified and as directed.

All as per item No 81 here-in-before but cable of size 400 sqmm 3.5 core.

Supply and filling/spreading uniformly 40/50 mm graded stone aggregate at outdoor type sub stations or any other location at sub stations all as directed.

Disconnecting and taking out existing unserviceable panel board of any size complete all as directed.

Taking out old damaged PCC pole of any size incl breaking PCC foundation and clearing the site all as directed.

M & L bricks laid flat for cable protection using old size dry bricks complete all as directed.

Disconnecting and taking out old burnt HT cables of any size incl joints/protection pipes etc from trenches/ducts/poles etc complete all as directed.

Disconnecting and taking out old burnt LT cables of any size incl joints/protection pipes etc from trenches/ducts/poles etc complete all as directed.

R D Bansal

SHARMA ELECTRICAL ENGINEERS

JAY BEE Industries