MAINTENANCE AND UPKEEP OF HT DISTRIBUTION SYSTEM TRANSFORMER AND ALLIED WORKS AT DGQA GHATKOPAR AND VIKROLI UNDER GE (NORTH) SANTACRUZ MUMBAI

Amount

Disconnecting carefully existing 11 KV/ 433 volt step down transformer of any capacity and carryout filtration/dehydration and measuring the di-electric strength which should not be less than 40 KV with 2.5mm gap after filtration and top-up with new transformer oil up to required level. including re-installation of transformer satisfactory on its original position connecting, testing and commissioning complete all as specified and as directed. Note : Transformer oil shall be measured and pied separately in relevant items).

Supply only for filling / topping up of new transformer oil having di-electric strength not less 50 KV complete including centrifuging of oil (if required) up to getting di-electric strength near 60 KV complete all as specified and as directed.

Disconnection of both HT and LT connection from cable end box, taking down the disconnected transformer of capacity upto 400KVA, 11/0.433 KV (Outdoor type) from platform, and transportation of unserviceable transformer complete unit to repair workshop including taking down faulty / defective copper wound transformer, opening the top cover, draining out unserviceable insulation oil and taking out the core of transformer for its repair alongwith the following work :- (a) Complete Rewinding of HT/LT leg coil complete using copper wire of existing gauge, size and turn as existing with double paper coated insulation including all requisite insulating materials like packing sleeves, separator, tapes etc. as specified and existing, heating, varnishing the core and winding assembly after framing up top and bottom steel structure of transformer all as specified and directed. (HT/LT Leg coils copper wound shall be measured and paid separately under relevant item of Sch ‘A’ here-in-after).

(b) Replacement of all insulating materials other than incorporated for rewinding of LT/HT coils as existing. (c) Fixing only existing serviceable accessories as obtained from Ser No 3 after proper cleaning, minor repair etc all as required and directed. (d) Replacement of all gasket materials in top cover, HT, LT bushing using rubberized gasket sheet 4.0/6.0 mm thick duly pasted with gasket cement. (e) Replacement of unserviceable bolts, fixing of existing serviceable bolts, nuts, washers of different size and tightening properly. (f) Repositioning of core and winding assembly inside the tank, assembling the complete unit and filling of new transformer oil and subsequent testing complete all as directed. (g) Type Tests as per clause 16.1.1 and routine test as per clause 16.1.2 of IS-2026 (Part I)-1977 are to be carried out at manufacturer work shop all as directed. (h) Refixing the transformer to its original side after repair including reconnection of HT/LT cables and including subsequent testing complete all as directed. Note: (i) Repairing works to be carried out in any reputed transformer manufacturer work shop and type test & routine test are to be done at said work shop as directed by Eng-in-charge as per IS provisions stated above. (ii) HT / LT Leg coils and transformer oil shall be measured and paid separately under relevant item of Sch ‘A’ here-in-after

Supply only LT leg coil of copper conductor/ strips for transformer of capacity up to 400 KVA complete with insulation, varnishing by vacuum impregnation and baking of coil assembly, etc. complete all as specified & directed by the EIC .

Supply only HT leg coil of copper conductor for transformer of capacity up to 400 KVA complete with insulation, varnishing by vacuum impregnation and baking of coil assembly, etc. complete all as specified & directed by the EIC

Supply and fixing in repair of LT bushing of existing size with brass/copper studs, washer & Rubber bush etc for 400 to 750 KVA transformer

Supply and fixing in repair of 11 KV HT bushing & brass/copper studs, gasket with-250 to 750 KVA

Supply and fixing in repair Transformer Gaskets and seals made from a blend of nitrile rubber and cork complete for capacity 250KVA to 750KVA transformer.

M&L for replacement of breather assembly transparent MS body with top and bottom portion pressed with metallic cover, filled with silica gel blue in colour and suitable for fixing on existing pipe of size 15/20/25 mm dia as per site requirement/ capacity of Transformer up to 250 KVA to 750 KVA

Material & labour for replacing the silica gel in the transformer breather of various capacity.

Dismantling and taking down old UNSV dial type temperature gauge and S&F new dial type temperature gauge having range 0 to 100 degree centigrade all as specified as directed.

Material & labour for loose filling with graded coarse stone aggregate 40mm for out door type sub station not exceeding 15 cm thick complete all as specified and as directed.

M&L for cleaning of E/M installations / campus surface dressing or trimming of branches of trees, cutting/ dressing of natural grass from ground to remove small inequalities not exceeding 15 cm deep ( including removing vegetation / shrubs / brush wood / under-growth ), cleaning of drains & carrying away the rubbish to a distance of not exceeding 50 mtr away complete, the area of installation up to 700sqm. at least 2 times in each installation at a interval of 3 months

Material and labour for painting of 11 KV distribution transformer of capacity from 400 to 750 KVA with synthetic enamel paint , two coats by spray painting approved colour after scraping of old paint, cleaning of all rusted portion surface including sign writing i.e. MES no, make, capacity etc. complete all as specified and as directed.

Disconnecting/ dismantling in position and carryout minor servicing of 11 KV distribution transformer of capacity from 400 KVA to 750 KVA for any type of leakage defect at LT/HT bushing, gasket, drain plug etc. after disconnecting of electrical supply and earth connection, drain out transformer oil and keeping in close containers for re-use, lifting/ removing of top cover of transformer, reassembling of transformer with new gasket set assembly, replacement of consumer oil tank, nuts, bolts & washers, as required at site, refilling of transformer oil on heated , complete after electric connections and testing on completion complete all as specified and as directed. (Note: (i) If retrieved transformer oil's di-electric strength is less than the desired level than it will be replaced with new one in relevant items of schedule. (ii) If any minor items is required for smooth functioning of transformer including general cleaning of equipment, the cost of the same will be deemed to be included in the unit rates. (iii) HT/LT bushing will be measured and paid separately. (iv) Gasket set shall be measured and paid separately under relevant item of schedule).

Supply & fix in repairs gate valve (Gun metal), ISI marked of size 25mm.

Earthing complete with GI earth plate electrode 60cm x 60cm x 6mm thick buried directly in ground (Earth pit not less then 2.25m deep below ground level ) with top edge not less than 1.5m below ground level connected to GI earth strip 32 x6 mm by means of GI bolts, nuts, check nuts, washers & GI strip ,protected by 50 mm bore GI pipe up to 7.5 mtr distance including necessary charcoal, salt & 20Kg Benzonite powder Funnel with wire mesh , watering pipe 20mm dia excavation earth work PCC (1:3:6) type C-1 earth chamber , 50mm thick RCC cover with 6mm nominal reinforcement etc complete all as shown electrical plate No. 5 of MES schedule part I all as specified and directed.

Supply & fix anti skid electrical insulating mat confirming to IS 15652/2006 (superseding IS : 5424-1969 ) BIS + CPRI+NTH+ERDA approved of C class of mats having dielectric strength 65 KV, sheet thickness not less than 2.5 mm using at power house including pasting of rubber mats with adhesive resin including taking down old UNSV rubber mats complete all as specified and directed by Engr-in-Charge.

Supply only High voltage insulation tape suitable for 11KV HT cable having size not less then 25mm x 9m x 0.076 cm complete all as specified and directed by engr-in-charge.

M & L for finding cable fault with electronic fault detector in LT/HT UG cable of any size ranging from 25 to 300 Sqmm 3/ 3.5 core, complete including necessary earthwork all as specified and directed by Engineer-in-charge.

Excavation in trenches not exceeding 1.5 mtr wide and not exceeding 1.5 mtr depth and getting out in Hard / dense soil including forming bottom surface etc. For taking up existing unserviceable U/G cable and for laying new XLPE U/G cable.

Returning, filling in including spreading, levelling , and well ramming in layers not exceeding 25 cm thick complete.

Removing excavated material not exceeding 50 mtr and depositing where directed at a level not exceeding 50 mtr above the starting point.

Material and labour for crushed sand filling in trenches for cable cushioning below and above the cable complete all as directed by Eng- in -charge.

Supply & laying un -un-reinforced precast concrete with flat cover Factory made Class HV, type 1, size 300x180x40 mm complete .

Supply, laying & testing XLPE insulated screened PVC bedded galvanised steel strip or wire armoured, electric power cable (Heavy duty) with stranded aluminium conductor 1100 volts grade of size 50 Sqmm 3.5 core including taking out old unserviceable cable from trenches all as specified and as directed.

Supply, laying & testing XLPE insulated screened PVC bedded, galvanized steel strip or wire armored, electric power cables (heavy duty) with stranded aluminum conductor, 11000 volts grade, of size 120 sqmm, 3 core including taking down unserviceable one complete.

M & L for galvanised steel tubing 50 mm bore light grade laid in trenches, road crossings for cable protection complete all as specified and directed including taking down the existing UNSV steel tubing.

Supply and lay double wall corrugated DWC HDPE pipe 40 mm bore as per IS-16205 and including couplers and bend for cable protection laid in trenches complete all as specified and directed.

M & L for cutting the existing bituminous road/hard standing to size not exceeding 45cm wide and depth not less than 45 cm for passing of UG cable through GI pipe and making good the disturbed surface filled with excavated material and top 200mm thickness with plain cement concrete type C1 1:3:6 using 20mm graded stone aggregates complete all as specified and directed by Engr-in-Charge.

Servicing of LT ACB 800 Amps Make : L&T with replacement of worn-out parts to make it serviceable at Ghatkopar substation complete all as specified and directed

Servicing of power factor improvement static condenser with manual control 415V, 50 cycles capacity 150 KVAR, consisting of complete all as specified and directed

Dismantling and taking down old UNSV and Supply, install, testing and commissioning of suitable size factory made out door type, dust and vermin proof, LT feeder pillar box double door, cubical and compartmentalized type with minimum depth size 450mm, 415 volts, AC, 50 Hz, fabricated with 3.15mm thick CRCA sheet for outer side and 2mm thick inside complete with and including mounted on angle iron frame stand of size 50 x 50 x 6 mm thick 50 cm long leg, grouted in PCC (1:2:4) type B1 (using 20 mm graded stone aggregate), spray painted inside and outside, powder coated of approved colour by Engineer-in-Charge, enclosed bus bar chamber with aluminium bus bar (04 Nos of rating capacity 400 Amps), mounted on PVC insulators, electric connection complete with from MCCB to main bus bar, cable glands, thimble complete with and including openable shutters butt hinged, locking arrangement including PCC work, excavation & earth work, taking down old rusted feeder pillar box complete and comprising supply and fix between Block A1 and A2 at Ghatkopar for following complete all as specified and as directed by Engineer-in-Charge. :-

INCOMING: (a) MCCB 4 pole, 250 Amps, 415 volts, 50 Hz, 36 KA, adjustable thermal & adjustable magnetic settings - 01 No. BUSBAR : (a) Bus bar chamber with 300 Amps aluminium strip with heat shrinkable insulating sleeve size 50 x 10mm - 4Nos of required length supported on FRP insulators, internal wiring for indicators with 2.5 Sqmm copper cable single core. (b) CT coil of ratio 200/5 Amps - 03 Nos (c) Digital type Multifunction meter of class I - 1 Nos Make : L & T Model : 4400 LED series or equivalent in Seimens/ Scneider. (d) LED type indicator lamps RYB - 01 Set OUTGOING: (a) MCCB 4 pole, 100 Amps, 415 volts, 50 Hz, 16 KA, adjustable thermal & adjustable magnetic settings - 06 Nos. (b) MCB 4 pole 32 Amp, 415 volt, 36KA, 50 Hz, adjustable thermal and adjustable magnetic settings - 01 Nos. (spare). Note: (i) Contactor shall be submit the drawings of panels for approval before fabrication in factory. (ii) LT panel board shall be CPRI approved.

S&F Cable jointing Kit for 11KV (E) grade cable for indoor cable End termination heat shrink type joint complete with jointing material and accessories suitable for 11 KV XLPE cable of size 3 core 120 sq mm with aluminium conductor

S&F Cable jointing Kit for 11KV (E) grade cable for indoor cable End termination heat shrink type joint complete with jointing material and accessories suitable for 11 KV XLPE cable of size 3 core 95 sq mm with aluminium conductor

S&F Cable jointing Kit for 11KV (E) grade cable for indoor cable straight through heat shrink type joint complete with jointing material and accessories suitable for 11 KV XLPE cable of size 3 core 95-120 sqmm with aluminium conductor

Material and labour for GI sheet of size 10x8 inch welded with 2.5 foot of angle iron for marking earth pit grouted on ground with PCC at different area complete all as specified and directed by Engr-in-Charge.

Supply and fix plastic coating print in GI sheet of size 10x8 inch for marking earth pit grouted on ground at different installations complete all as specified and directed by Engr-in-Charge.

Chaudhary Enterprises (BID ID -3312747)