REPAIR/MAINTENANCE TO TRANSFORMER, LT PANEL AND OTHER ALLIED WORKS AT BORJHAR, AMINGAON, SADILAPUR AND TRANSIT CAMP UNDER GE GUWAHATI

Amount

Excavation in trenches n. exc 1.5 m wide and n.exc 1.5 m in depth and getting out soft loose soil complete all as specified and directed for foundation of stay, pole, taking out/ laying of cables etc. as specified and directed.

Returning, filling in, including spreading, levelling, watering and well ramming in layers not exceeding 25 cm thickin soft loose soil complete as directed.

Removing excavated surplus soils to a distance not exceeding 50 metres and depositing where directed, at a level not exceeding 1.5 metre above the starting point, complete all as specified and directed.

Supply and laying well burnt brick, Sub class ‘B’, old size as in cable protection, laid across in trenches complete all as specified and directed.

Supplying and laying reinforced precast concrete cable cover, class EHV, Type 1 with peak, size 450mm x 230mm x 50mm, complete all as specified and directed.

M&L Hard surface cutting as in road pavement etc for laying of pipes etc of any size of approximate width of 45cm and depth 60cm and making good disturbed surfaces by complete filling with PCC 1:4:8 type D-2 and removing excavated material at a distance not exc 50m complete all as specified and directed.

M & L for sand cushioning with clean, dry sand in trenches for protection of UG cables complete as specified and directed.

M&L Galvanised steel tubes, light grade 100 mm bore for cable protection on pole/trenches etc. complete all as specified and directed.

Taking out old underground cables, any size or capacity from trenches, ducts, floor, pipes including cable protection and keeping serviceable bricks in safe custody for reuse in the work complete all as directed. Note : Excavation and earth work shall be measured and paid separately.

Supply & laying in trenches/fixed to pole, walls. etc LT, XLPE insulated, armoured, heavy duty electric power cable with aluminum conductor, 1100 Volts grade, cross sectional area 95 Sqmm, 3.5 core conforming to IS-7098 (Part-I)-1988 and testing complete as specified and directed.

Supply & laying in trenches/fixed to pole, walls. etc LT, XLPE insulated, armoured, heavy duty electric power cable with aluminum conductor, 1100 Volts grade, cross sectional area 70 Sqmm, 3.5 core conforming to IS-7098 (Part-I)-1988 and testing complete as specified and directed.

Supply & laying in trenches/fixed to pole, walls. etc HT, XLPE insulated, armoured, heavy duty electric power cable with aluminum conductor, 11000 Volts grade, cross sectional area 95 Sqmm, 3 core conforming to IS-7098 (Part-I)-1988 and testing complete as specified and directed.

M&L Cable jointing kit for 11 KV (earthed) grade cable for outdoor termination heat shrink type joint complete with jointing material and accessories suitable for 95 sqmm 3 core XLPE armoured aluminium conductor cable all complete as specified.

M&L for Outdoor/indoor end Termination cable jointing kit suitable for 1100 Volts grade, XLPE armoured aluminum conductor cable of cross sectional area 50 to 95 Sqmm, 3.5 core, heat shrink type complete with jointing material and accessories complete all as specified and directed.

Dismantling of cross arm of MS channel or angle section complete all as specified and directed.

M & L for Cross arms, bracing, supports,clamps, and back plates fabricated from structural steel sections including nuts, bolts, washers, welding, bending cold or hot, drills holes for bolts in any shape or size as indicated or directed and inclusive of one primer coat one under coat and one finishing coat of paint complete all as specified and directed.

Materials and labour for plain cement concrete (1:3:6) Type C-2 using 40mm graded aggregate in foundations for pole / Stay/ transformer base , filling and mass concrete complete all as specified and directed.

S&F in repair Chain link MS galvanised fencing, any size or type complete as directed.

Materials and labour scrapping the existing surfaces of LT steel tubular poles,type 410 SP-31 ( 9 mtr long) including cross arms bracings clamps etc and applying two coats aluminium paint including writing Pole No with black paint as S/S -X/Y complete all as specified and directed (s/s-X for Sub station No & Y for Pole No under S/S -X) complete all as specified and directed.

S & F in repair offload changeover switch 63 Amps ,415V ,4P of make L&T/Havells/Crompton/C & S or of equivalent make all complete.

S & F in repair offload changeover switch 100 Amps ,415V ,4P of make L&T/Havells/Crompton/C & S or of equivalent make all complete.

S & F in repair Main switch 63 Amps ,415V ,4P of make L&T/Havells/Crompton/C & S or of equivalent make, complete all as specified and directed.

S & F in repair Main switch 100 Amps ,415V ,4P of make L&T/Havells/Crompton/C & S or of equivalent make, complete all as specified and directed.

S & F in repair MCCB 63Amps 4P ,415V,breaking capacity 10KA of make L&T/Havells/Crompton/C & S or of equivalent make, complete all as specified and directed.

S & F in repair MCCB 100Amps 4P ,415V,breaking capacity 25KA of make L&T/Havells/Crompton/C & S or of equivalent make, complete all as specified and directed.

S & F in repair MCCB 200Amps 4P ,415V,breaking capacity 25KA of make L&T/Havells/Crompton/C & S or of equivalent make, complete all as specified and directed.

Disconnecting electrically and taking down old unserviceable electric control panel/bus bar panel of any size, complete all as specified and directed.

Supplying, installing, testing and commissioning, Indoor type cubical LT panel board of size not les than 1000mmx1100mmx400mm with canopy, suitable for 3 phase, 4 wire, 415 Volts and CPRI approved, factory fabricated having modern fabrication and testing process which includes seven tanks pre treatment process, comprising of degreasing, rising, derusting, phosphating and preservation followed by anti corrosive painting (after applying two coats of metal primer) with siemens grey paint.The panel shall be provided with suitable gasket to make it dust/ vermin proof and degree of protection not less than IP-54 and general construction conforming to IS.The panel shall be made out of 3.15 mm thick CRCA sheet duly compertment wise for each control gear, front and back opening with sliding bolt type locking arrangement. The panel board shall be provided with proper ventillation, including suitable size of cable alley aluminium bus bar suitable for carrying of current 150 Amps. Connections from MCCB out going to main bus bar shall be carried out with TPN aluminium bus bars of suitable rating and connections from main bus bar to out going MCCB's (intake point) will be carried out with TPN aluminium bus bar as per MCCB rating duly insulated and colour coded heat shrinkable sleeve and shall be rigidly mounted on suitable size of bridge insulator.The cubical shall have bottom channel of suitable size MC100 and angle iron 50x50x6mm thick legs of 75 cm long (45cm above ground and 30 cm below ground) and painted with 2 coats of black synthetic enamel paint over a coat of red oxide primer.GI earth busbar of size 50X6 mm shall be provided through out the panel and a detachable pre drilled gland plate of powder coated shall be provided at bottom.All control wires shall be copper conductor, multistranded flexible and shall be bunched, tied, ferruled for proper identification and crimped including cable connections of exsiting cable with adequate size aluminium lugs complete all as directed. The panel shall comprise of the followings:-

(a) Incomming MCCB 63 Amps, 4 pole, 25 KA- 01 No.

(b) Out going MCCB 32 Amps, 4 pole, 25 KA- 01 No.

(c) Out going MCCB 40 Amps,4 pole, 25 KA- 01 No.

(d) Digital voltmeter (0-500 V) - 01 No

(e) Digital Ammeter (0 to 100 Amps) -01 No

(f) CT 100/5 Amp, VA-8 - 03 Nos

(j) Indicator lamp LED type (RYB) (03 Nos) set-01

(k) Panel mounted change over switch 63 A -01 No

(l) Panel mounted star delta starter, 15 HP - 01 No. Note:- 1. All MCCBs shall be fixed thermal and fixed magnetic setting type. 2. Excavation, earth work and PCC work (1:3:6) shall be measured & paid seperately. 3. Design and drawing of panel board shall be got approved from GE before procurement /incorporation in the work.

Disconnecting of both HT and LT connection from cable end box and taking down the disconnected transformer (Out Door/Indoor type) of 200 to 500 KVA capacity from platform with the help of recovery/Hydra, chain pulley and other T&P required at site, and transportation of unserviceable transformer to authorized civil workshop and bringing back at same location after repair in a suitable vehicle including loading, unloading, complete all as directed .

Disconnecting of both HT and LT connection from cable end box and taking down the disconnected transformer (Out Door/Indoor type) of 50 to 125 KVA capacity from platform with the help of recovery/Hydra, chain pulley and other T&P required at site, and transportation of unserviceable transformer to authorized civil workshop and bringing back at same location after repair in a suitable vehicle including loading, unloading, complete all as directed .

Taking down unserviceable Copper/aluminium wound from transformer, opening top cover, draining out unserviceable insulation oil and carrying out the following work for 200 to 500 KVA transformer all as directed by the Engr-in-Charge:- (a) Taking out core with winding assembly. (b) Dismantling of all attachment viz breather assembly, conservator, oil temperature gauge, HT/LT bushing etc. and keeping aside for reuse or replacement as required and directed. (c) Removing of complete winding from core and dismantling the core, cleaning of core laminate sheet and keeping aside for reuse. (d) Cleaning of complete transformer tank oil fins, removing of sludge, and making the inside surface of tank dry by blowing of hot air as directed. (e) Painting outside surfaces of transformer complete by means of spray machine as directed.

Taking down unserviceable Copper/aluminium wound from transformer, opening top cover, draining out unserviceable insulation oil and carrying out the following work for 50 & 125KVA transformer all as directed by the Engr-in-Charge:- (a) Taking out core with winding assembly. (b) Dismantling of all attachment viz breather assembly, conservator, oil temperature gauge, HT/LT bushing etc. and keeping aside for reuse or replacement as required and directed. (c) Removing of complete winding from core and dismantling the core, cleaning of core laminate sheet and keeping aside for reuse. (d) Cleaning of complete transformer tank oil fins, removing of sludge, and making the inside surface of tank dry by blowing of hot air as directed. (e) Painting outside surfaces of transformer complete by means of spray machine as directed.

Repair to the transformer of capacity 200 & 500 KVA as follows:- (a) Rewinding of HT/LT leg coil complete using copper wire of appropriate gauge, size and turn as per existing with double paper coated insulation including all requisite insulating materials like packing sleeves, separator, tapes etc. heating, varnishing the core and winding assembly after framing up top and bottom steel structure of transformer all as specified and directed. (Note :- HT/LT leg coils, HT/LT Brass spindal, breather assembly and transformer oil shall be measured and paid separately under relevant items of this Schedule here-in-after as ‘Supply only’) (b) Replacement of all insulating materials other than incorporated for rewinding of HT/LT coils as per existing. (c) Fixing only HT procelain bushing with studs, nuts, washers 3 Nos. and LT procelain bushing with studs, nuts, and washers 4 Nos. and connection with primary and secondary windings and reconnecting with the main terminals as required and directed. (d) Fixing only existing serviceable accessories as obtained from para (b) here-in-before after proper cleaning, minor repairs etc. as required and directed. (e) Replacement of all unserviceable gasket from top cover, HT/LT bushing with new one by using rubberised gasket sheet 4.0mm/6.0mm thick duly pasted with suitable adhesive . (f) Replacement of unserviceable bolts with new one and fixing of existing serviceable bolts, nuts, washers of different sizes and tightening properly. (g) Repositioning of core and winding assembly inside the tank, assembling complete unit and making the transformer ready for filling oil and subsequent testing as directed.

Repair to the transformer of capacity 50 to 125 KVA as follows:- (a) Rewinding of HT/LT leg coil complete using copper wire of appropriate gauge, size and turn as per existing with double paper coated insulation including all requisite insulating materials like packing sleeves, separator, tapes etc. heating, varnishing the core and winding assembly after framing up top and bottom steel structure of transformer all as specified and directed. (Note :- HT/LT leg coils, HT/LT Brass spindal, breather assembly and transformer oil shall be measured and paid separately under relevant items of this Schedule here-in-after as ‘Supply only’) (b) Replacement of all insulating materials other than incorporated for rewinding of HT/LT coils as per existing. (c) Fixing only HT procelain bushing with studs, nuts, washers 3 Nos. and LT procelain bushing with studs, nuts, and washers 4 Nos. and connection with primary and secondary windings and reconnecting with the main terminals as required and directed. (d) Fixing only existing serviceable accessories as obtained from para (b) here-in-before after proper cleaning, minor repairs etc. as required and directed. (e) Replacement of all unserviceable gasket from top cover, HT/LT bushing with new one by using rubberised gasket sheet 4.0mm/6.0mm thick duly pasted with suitable adhesive . (f) Replacement of unserviceable bolts with new one and fixing of existing serviceable bolts, nuts, washers of different sizes and tightening properly. (g) Repositioning of core and winding assembly inside the tank, assembling complete unit and making the transformer ready for filling oil and subsequent testing as directed.

Installation of transformer of same capacity or higher capacity (upto 500 KVA) in place of unsv transformer (which found major repair and taking to wksp for repair), on hire basis for maximum period of 10 days when ordered. Note:- Repairing of transformer have to be completed with in 10 days duration, no extra cost will be paid toward hiring charges beyond 10 days. Moreover contractor will not be allowed to shift the hired transformer until it is replaced by the repaired transformer. Any thing goes wrong in the hired transformer, no extra cost will be paid towards repairing of hired transformer. Contractor should check the available infrastructure and to be sure regarding safety of transformer before installation. The rate quoted is deemed to be included transportation cost, connecting incoming & outgoing cables, earthing leads lifting/lowering arrangement, labour etc, complete all as specified and directed.

Supply only LT leg coil of copper conductor for transformer of capacity 50 to 500 KVA complete with insulation, varnishing by vacuum impregnation and baking coil assembly, etc. as required complete and as directed. Note - weight of LT leg coil shall be measured and paid as per actual measurement on ground .

Supply only HT leg coil of copper conductor for transformer of capacity 50 to 500 KVA complete with insulation, varnishing by vacuum impregnation and baking coil assembly, etc. as required complete and as directed. Note - weight of HT leg coil shall be measured and paid as per actual measurement on ground.

Supply only transformer oil of approved quality as per IS having dielectric strength of 40-60 KV in 2.5mm gap for filling in transformer or for topping up as required, complete all as specified and directed.

Dehydration, filtration of transformer oil by means of centrifugal filtration plant to achieve desired dielectric strength of 35 to 40 KV at 4mm gap in existing position of transformer of any capacity and topping up transformer oil at various Sub-Stations all as required and directed by the Engr-in-Charge. Note : Deficient quantity of transformer oil required for topping up shall be measured paid as "supply only" under item mentioned here in before).

Disconnecting and removing transformer from transformer plinth/four pole structure after disconnecting HT/LT side cable connections and draining out transformer oil for repair/ maintenance of transformer of the following capacity all as directed by the Engineer-in-Charge :-

(a) 50 to 125 KVA

(b) 200 to 500 KVA

Maintenance of transformer such as cleaning of core and winding by means of washing down with clean dry oil to remove dust/sludge on core and coil, cleaning of oil tank to remove sludge deposits, replacement of old rusted gasket set, burnt out spindle, broken/unserviceable HT and LT ceramic bushing, broken arc horn surge arrester, replacement of silica gel with new one for transformer of following capacity all as required and directed by Engineer-in-Charge :- (Note : (a) Cost of oil for cleaning shall be deemed included in the quoted rate. (b) New Spares required at site against the replacement of old unserviceable one shall be measured and paid separately as ‘Supply only’ under relevant items here-in-after.)

(a) 50 to 125 KVA

(b) 200 to 500 KVA

Supply only breather assembly of approved make filled with silica gel suitable for transformer of capacity 50 to 63 KVA, complete all as specified and directed.

Supply only breather assembly of approved make filled with silica gel suitable for transformer of capacity 100 to 200 KVA, complete all as specified and directed.

Supply only breather assembly of approved make filled with silica gel suitable for transformer of capacity 250 to 500 KVA, complete all as specified and directed.

Supply only brass spindle for terminal on HT side threaded complete with nut washers etc of suitable dia for transformer of capacity 50 to 63 KVA, complete all as specified and directed.

Supply only brass spindle for terminal on HT side threaded complete with nut washers etc of suitable dia for transformer of capacity 100 to 200 KVA, complete all as specified and directed.

Supply only brass spindle for terminal on HT side threaded complete with nut washers etc of suitable dia for transformer of capacity 250 to 500 KVA, complete all as specified and directed.

Supply only brass spindle for terminal on LT side threaded complete with nut washers etc of suitable dia for transformer of capacity 50 to 63 KVA, complete all as specified and directed.

Supply only brass spindle for terminal on LT side threaded complete with nut washers etc of suitable dia for transformer of capacity 100 to 200 KVA, complete all as specified and directed.

Supply only brass spindle for terminal on LT side threaded complete with nut washers etc of suitable dia for transformer of capacity 250 to 500 KVA, complete all as specified and directed.

Supply only ceramic bushing on HT side suitable for transformer of capacity 50 to 63 KVA, complete all as specified and directed.

Supply only ceramic bushing on HT side suitable for transformer of capacity 100 to 200 KVA, complete all as specified and directed.

Supply only ceramic bushing on HT side suitable for transformer of capacity 250 to 500 KVA, complete all as specified and directed.

Supply only gasket set for top lid cover & LT and HT terminal bushing suitable for transformer of capacity 50 to 63 KVA, complete all as specified and directed.

Supply only gasket set for top lid cover & LT and HT terminal bushing suitable for transformer of capacity 100 to 200 KVA, complete all as specified and directed.

Supply only gasket set for top lid cover & LT and HT terminal bushing suitable for transformer of capacity 250 to 500 KVA, complete all as specified and directed.

Dismantling of lightening arrestor/expulsion fuse/GOD 11 KV complete as specified and as directed.

M&L switches air break, gang operated, triple pole, mechanically operated, mounted on insulator and steel frame, with operating mechanism worked from ground level, for current rating upto 200 amps and 11000 volt complete all as specified and as directed.

M&L for HT drop out expulsion fuse unit suitable for upto 25 Amps Capacity at 11 KV ,single pole (two post insulators per pole) with HT barrel fuse with holder including necessary connection to ACSR conductor of suitable size including dismantling of old expulsion fuse complete all as specified and as directed.

S&F Lightening arrestors expulsion type with all fittings, transmission class, discharge capacity 65 kilo Amps suitable for 11000 volts complete as specified and directed.

S & F in repair Pin type, porcelain, vitreous, white, brown or green insulator including one galvanised mild steel spindle, two galvanised iron washers and one galvanised iron nut, 150mm height, 65mm dia for 11000 volts grade, complete all as specified and directed.

M&L Earthing complete with galvanised steel earth plate electrode 600mmx600mmx6mm thick, buried directly in ground (earth pit not less than 2.25m deep below ground level) with top edge of the plate not less than 1.5m deep below normal ground level, connected with GI earth strip of size 25x4mm as earth lead up to test point by means of nuts, bolts, check nuts protected by and including GI pipe 40mm bore (light grade) and connected to main test point as directed and including concrete pit in PCC (1:3:6) type C-1, precast RCC (1:2:4) type B-1 cover slab 30cm x 30cm x 10 cm, reinforced with 8mm dia TMT bars @ 100 mm C/C both ways with one handle for lifting, made out of 8mm dia TMT bar embedded in pre cast cover slab, funnel, wire mesh, 15mm bore GI pipe (medium grade) for watering, charcoal and salt in alternate layers, including necessary excavation and earth work in any type of soil complete all as shown on Electrical Plate No 3 of SSR Part-I, complete all as specified including taking down old one and as directed. Note : Rate quoted by tenderers shall be deemed to include for following provisions;-[i]. Excavation & earth work in any type of soil including removing of surplus material upto 50 M.[ii]. PCC 1:3:6 type C1 using 20mm graded stone aggregate in pit & 40mm thick precast RCC 1:2:4 type B1 cover 30x30 cm with 8mm TMT bars @ 10 cm C/C both ways with handles.[iii]. Main earthing strip from earth electrode to test point upto 7.5 mtr.[iv]. Funnel with watering pipe [GI pipe] 20mm bore [ISI marked] medium grade & copper lugs, charcoal & salt as reqd.[v]. GI protection pipe of size 40 mm bore light grade 7.5m.

M/S SEWAK SINGH

MAC ENGINEERS

M/s Dhani Enterprise