REPAIR/MAINTENANCE TO TRANSFORMER, VCBs AND OTHER ALLIED WORKS AT BASISTHA AREA UNDER GE GUWAHATI

Amount

Disconnecting of both HT and LT connection from cable end box and taking down the disconnected transformer (Out Door/Indoor type) of 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 150 to 250 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 100 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 the unserviceable Copper/aluminium wound from transformer, opening top cover, draining out unserviceable insulation oil and carrying out the following work for 500KVA capacity transformer all as directed :- (a) Taking out the 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 of outside surfaces of transformer complete by means of spray machine as directed.

Taking down the unserviceable Copper/aluminium wound from transformer, opening top cover, draining out unserviceable insulation oil and carrying out the following work for 150 to 250KVA capacity transformer all as directed :- (a) Taking out the 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 of outside surfaces of transformer complete by means of spray machine as directed.

Taking down the unserviceable Copper/aluminium wound from transformer, opening top cover, draining out unserviceable insulation oil and carrying out the following work for 50 to 100KVA capacity transformer all as directed :- (a) Taking out the 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 of outside surfaces of transformer complete by means of spray machine as directed.

Repairs to the transformer of capacity 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 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.

Repairs to the transformer of capacity 150 to 250KVA 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 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.

Repairs to the transformer of capacity 50 to 100KVA 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:- (a)HT/LT leg coils, HT/LT Brass spindal, breather assembly and transformer oil shall be measured and paid separately under relevant items 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.

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 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 100 KVA

(b) 150 to 250 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 100 KVA

(b) 150 to 250 KVA

Supply only breather assembly of approved make filled with silica gel suitable for transformer of following :-

(a) 50 to 100 KVA

(b) 150 to 250 KVA

Supply only brass spindle for terminal on HT side threaded complete with nut washers etc of suitable dia for transformer of the following Capacity:-

(a) 50 to 100 KVA

(b) 150 to 250 KVA

Supply only brass spindle for terminal on LT side threaded complete with nut washers etc of suitable dia for transformer of following capacity:-

(a) 50 to 100 KVA

(b) 150 to 250 KVA

Supply only ceramic bushing on HT side suitable for transformer of following capacity :-

(a) 50 to 100 KVA

(b) 150 to 250 KVA

Supply only gasket set for top lid cover & LT and HT terminal bushing suitable for transformer of following capacity :-

(a) 50 to 100 KVA

(b) 150 to 250 KVA

M&L, Repairing & servicing with primary and secondary injection and caliberation of 11 KV HT VCB by taking out the enclosure including all components and cleaning the bus bar complete & refixing the same after duly repaired and replacement of unserviceable components/parts complete as required and directed. (Note:- New Spare/Parts shall be measured and paid separately under relevant items as “Supply only”)

Supply only Vaccum Interrupter/Vaccum bottle 440 Volts as per existing make and as approved

Supply only Spring charging motor, 250 Watt, 240 Volts, AC as per existing make as approved.

Supply only Breaker Control switch with spring return and sequence device, 32 Amps, 440 Volts as per existing make as approved.

Supply only Closing spring, 440 Volts of existing make

Supply only Closing release, 440 volts, of existing make

Supply only Tripping lever, 440 Volts of existing make

Supply only Contactor, capacity 240 Volts, 4NO + 4 NC, 10 Amps as per existing make .

Supply and Fixing, 100 Ah battery, dry type (for battery bank) all as specified.

M&L Repairs& servicing with primary and secondary coil and caliberation of voltage stablizer of 30 KVA by taking out the enclosure including all components and cleaning complete & refixing the same after duly repaired and replacement of unserviceable components/parts complete as required and directed. (Note:- New Spare/Parts shall be measured and paid separately under relevant items as “Supply only”)

Supply only Dimmer motor 110 Volt, AC as per existing make as approved.

Disconnecting electrically and dismantling of old unserviceable electric control panel/bus bar panel of any size complete all as required and as directed .

Supplying, installing, testing and commissioning, indoor type, cubical, LT panel board, size not less than 1500mmx 2250mmx 600mm 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 2 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 600 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) MCCB 400 Amps 4 Pole 50 Hz 415 V with thermal magnectic release having rupturing capacity 36 KA - 1Nos (Incoming).

(b) MCCB 250 Amps 4 Pole 50 Hz 415 V with thermal magnectic release having rupturing capacity 25 KA - 2Nos (Outgoing).

(c) MCCB 160 Amps 4 Pole 50 Hz 415 V with thermal magnectic release having rupturing capacity 25 KA - 2Nos (Outgoing).

(d) 3Ph digital multi function meter model A, class 1, 5A with relay Vega Series - 1Nos

'(e) Indicating lamp 240 volts LED type - set of three.

Note:- 1. All MCCBs shall be fixed thermal and fixed magnetic setting type except Srl No 25.01(a) which shall be of adjustal thermal & megnatic setting. 2. Design and drawing of panel board shall be got approved from GE before procurement /incorporation in the work.

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 and as directed including taking down old one. 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&L, Earthing complete with copper plate electrode of 600mmx 600mmx 3.15mm 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 copper earth strip of size 20x3mm 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 and as directed including taking down old one. 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.

S&F, in repair, Test point terminal block made of gun metal or phosphorusbronze size 75x75x25mm drilled and screwed including 3 nos. 8mm dia 25mm long hexagonal head screw complete all as specified and as directed.

S&F, in repair, galvanised iron strip of size 25x4mm complete all as specified and as directed.

Supply and fixing, copper strip 20 x 3 mm size complete all as specified and as directed.

Supply and fixing Klemmeschutzer KD-300/TR-INS Cable Terminal Protector for Outdoor Transformer Bushing upto 24 kV having minimum wall thickness 4.5mm, tensile strength of minimum 3.5 N/Sqmm, ultimate elongation of minimum 500%, operating temperature is between -35 Deg. C to +130 Deg. C and dielectric stregth of minimum 18 kV/mm complete all as specified and directed. Make : K.D.Joshi Rubber Industries Pvt. Ltd. Item Code - 1001 or equivalent as approved by GE from list of approved makes.

M&L for Lightning arrestors complete with all fittings, station class, discharge capasity, 65 KA, 11000 Volts complete incl dismantling of unsv arrestors all as specified and as directed.

M&L for switch 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 11000 Volts complete including dismantling of old unsv GOD all as specified and as directed.

Disconnecting the existing connection of Battery Charger of 130V/20A and carry out necessary Decarbonsing/cleaning the Battery charger consists of Battery Chamber, circuit chamber and metering chambers, by opening the spout/bus covers inspecting and cleaining the Battery terminal leads , checking and repair by supply and replacing u/s minor parts of DC circuit complete for desired output amps and re-assembling complete including painting with a coat of synthetic enamel paint after cleaning and preparing the metal surface all as directed by Engineer-in-Charge.

M&L for loose filling of 40 mm graded stone aggregates as in plinths of out door transformer, sub stations, panel boards yard complete all as specified and as directed.

Material and labour in repair for fixing MS chequered plates FE -410-W(Gde-E-250) quality-A, 5 mm thick or over in thickness available by cutting in shape/size as required for duct cover complete all as specified and as directed.

Supply, fix and connect multifunction panel meter for measuring V, A, Hz, KW, KVA & PF, digital type, Class-1.0 including dismantling of old unsv meter . Make: L&T Model-Vega Series Cat No.WDM303FDWA1 or equivalent of ABB / Schenider

M&L as in repair for chain link fencing of GI wire 4mm dia in mesh of size 100 mm x 150 mm including line wires and fixed complete to the fencing posts all as specified and directed by Engineer in charge.

M&L as in repair MS Flat 40 X 6 plate for fixing of chain link fencing in post holes.

M&L 10mm dia of MS stiffners interwoven horizentally at places to the chain link.

S&F Mild steel angle iron, or any section fixed independenly.

M&L for surface dressing up to 15 cm in depth including cleaning of vegitation, removing grass, small plants and other unwanted material and levelling inside substations and surrounding area and removal of excavated materials at a distance not exc 50 m where directed complete all as specified and as directed.

S&F, in repair, MCCB, 630 Amps, 50 KA, 415 Volts, 4 Pole with adjustable thermal & adjustable magnetic setting complete as specified and directed. Make : Indoasian cat No.830408 or equivalent of L&T/HPL/Schenider.

S&F, in repair, MCCB, 400 Amps, 36 KA, 415 Volts, 4 Pole with adjustable thermal & adjustable magnetic setting complete as specified and directed. Make : Indoasian cat No.830396 or equivalent of L&T/HPL/Schenider.

S&F, in repair, MCCB, 250 Amps, 25 KA, 415 Volts, 4 Pole with fixed thermal & adjustable magnetic setting complete as specified and directed. Make : Indoasian cat No.830107 or equivalent of L&T/HPL/Schenider.

S&F, in repair, MCCB, 200 Amps, 25 KA, 415 Volts, 4 Pole with fixed thermal & adjustable magnetic setting complete as specified and directed. Make : Indoasian cat No.830106 or equivalent of L&T/HPL/Schenider.

AAY JAY ENTERPRISE

M/S K Nath and co