CWE/AF AMB/HAL-48/2021-22 SPECIAL REPAIR/REPLACEMENT/UPGRADATION OF TRANSFORMERS AT AF STATION HALWARA UNDER GE (AF) HALWARA

Amount

Supply, installation, commissioning and testing of 630KVA distribution transformer, step down, 11 KV (primary side)/433 volt (secondary side) as per IS-1180-2014 (Level-II), copper wound, suitable for AC, three phase, 4 wire, 50 Hz system, outdoor type, oil immersed having Vector group DYN-11, no load voltage ratio- 11/0.433 KV, temperature rise in oil 45 degree centrigrade & in winding 55 degree centigrade, Oil Natural Air Natural (ONAN) cooled with and including first filling of transformer oil, delta connection on HT side, star connection on LT side, manually, operated, off-load tap changer on HT side to vary secondary voltage to + 7.5% & -7.5% in three steps of 2.5% each, cable end box at HT & LT side, LT side cable box shall also be fitted with suitable size of cable glands for making connections with all the accessories as per clause 19.14.1.2 of SSR Part-I and the under mentioned fittings complete all as specified and directed:-

Supply, installation, commissioning and testing of 400KVA distribution transformer, step down, 11 KV (primary side)/433 volt (secondary side) as per IS-1180-2014 (Level-II), copper wound, suitable for AC, three phase, 4 wire, 50 Hz system, indoor type, oil immersed having Vector group DYN-11, no load voltage ratio- 11/0.433 KV, temperature rise in oil 45 degree centrigrade & in winding 55 degree centigrade, Oil Natural Air Natural (ONAN) cooled with and including first filling of transformer oil, delta connection on HT side, star connection on LT side, manually, operated, off-load tap changer on HT side to vary secondary voltage to + 7.5% & -7.5% in three steps of 2.5% each, cable end box at HT & LT side, LT side cable box shall also be fitted with suitable size of cable glands for making connections with all the accessories as per clause 19.14.1.2 of SSR Part-I and the under mentioned fittings complete all as specified and directed:-

Supply, installation, commissioning and testing of 315/320KVA distribution transformer, step down, 11 KV (primary side)/433 volt (secondary side) as per IS-1180-2014 (Level-II), copper wound, suitable for AC, three phase, 4 wire, 50 Hz system, outdoor type, oil immersed having Vector group DYN-11, no load voltage ratio- 11/0.433 KV, temperature rise in oil 45 degree centrigrade & in winding 55 degree centigrade, Oil Natural Air Natural (ONAN) cooled with and including first filling of transformer oil, delta connection on HT side, star connection on LT side, manually, operated, off-load tap changer on HT side to vary secondary voltage to + 7.5% & -7.5% in three steps of 2.5% each, cable end box at HT & LT side, LT side cable box shall also be fitted with suitable size of cable glands for making connections with all the accessories as per clause 19.14.1.2 of SSR Part-I and the under mentioned fittings complete all as specified and directed:-

Following standard fittings shall also be provided in each transformer as specified in BOQ item No. 1.00 to 3.00:- (a) Rating plate and terminal marking plate. (b) Two earthing terminal for body earthing and two additional for neutral brought out on a bushing. (c) Lifting lugs. (d) Drain valve with plug or cover plate. (e) Dehydrating breather. (f) Oil level indicator with minimum and maximum marking. (g) Cooling radiator. (h) Thermometer pocket. (j) Conservator. (k) Oil filling hole with cover. (l) Thermometer 100mm dial/stem type with metal guard having maximum temperature indication with resetting. (m) Silica gel breather duly filled with silica Gel. (n) Plain breathing device which would not permit ingress of rain water & incsects. (o) High voltage / low voltage copper stud bushing with cable end box. (p) Control cable for connection of buchholtz relay including buchholtz relay as per manufacturer's recommendation. (q) Any other fittings as recommended by the manufacturer of efficient functioning of the transformer.

Notes for BOQ item No 1.00 to 3.00:- (i) The transformer shall be of latest star rated and energy conservation (Energy conservation Binary Corps) for which necessary test certificate of manufacturer shall be produced by the contractor. (ii) Transformer manufacturer shall be in possession of licence from bureau of Indian standard. (iii) The fitting & accessories of the transformer shall be conforming to is 3639 : 1996. (iv) The transformer shall be tested as per IS for all routine tests in the factory premises in the presence of rep of Accepting Officer on the receipt of request from the contractor in addition to routine tests . The transformer shall be tested for 10% over load at factory premises for minimum 01 hour after full load cycle of 08 hours. (v) The Transformer shall be tested by SEI/EI/AEI beore commissing as & when requested by contractor. (vi) All necessary arrangements i.e. co-ordination with the manufacturer & testing officer, arranging equipments and material to facilitate testing at the manufacturer’s premises etc. shall be borne by the contractor. (vii) Next immediate Higher capacity of transformer shall be provided without any price adjustment if the capacity specified in BOQ/Schedule ‘A’ is not available in market. Similarly in case if transformer for specified capacity are aviailbale with latest specification in market, the same shall be provided without any price adjustment.

M&L in replacement earthing complete with galvanized steel earth plate electrode 60cm X 60cm X 6mm thick buried vertically in ground to depth not less than 2.25 mtr below ground level, with top edge of earth plate not less than 1.5 mtr below ground level surrounded from all sides by 15cm thick packed layer of Charcoal dust & common salt filled in alternate layers and electrode connected to GI earth lead strip 32mm x 6mm upto 7.5mtr long by means of bolts, nuts, check nuts and washers of galvanized iron and connection to earthing test point & earth dolly & watering pipe medium grade GI 20mm bore including protection pipe GI light grade 40mm bore, including wire mesh, funnel, lugs, salt, charcoal dust, excavation in soft/losse soil, returning filling & removal of surplus soil upto 50mtr, pit chamber shall be of PCC 1:2:4 type B1 using 20 mm graded mechnically crushed stone aggregates and pit cover slab 80mm thick shall be of Precast RCC 1:2:4 type B-1 using 20 mm graded mechnically crushed stone aggregates reinforced with XPM weighing not less than 4Kg/sqm including necessary form work complete all as shown in electrical plate No 3 of SSR part-I, including testing on completion at site complete all as specified and directed. Notes:- (i) Any variation in length of earth lead and protection pipe of earth lead shall be adjusted through DO. (ii) On testing if the desired earth resistance is not obtained, earthing will be generated at no extra cost , till the desired earth resistance is obtained. (iii) The chamber shall be constructed atleast 1.5 mtr away from the earth electrode.

Supply, laying, jointing, testing and commissioning in replacement LT XLPE electric cable, 1100 Volts grade, heavy duty, PVC insulated and sheathed armoured electric power cable with stranded aluminium conductor of cross sectional area 150 sqmm 3.5 core conforming to IS- 7098 (Part I) 1988 as in trenches or along the wall/pole through pipe etc, complete all as specified and directed. Note:- Excavation & earth work, sand cushioning, protection pipes, end termination joints & protection covers shall be measured and paid separately.

Boring of holes under road, pavement, hard standing by trenchless technology using ultra sounding technique and necessary T&P for passing of LT/HT cables through & inlcuding 150mm dia HDPE pipe, Class 3, having working pressure 0.4 Mpa complete all as specified and directed. Note: Boring per RM and HDPE Pipe per RM shall measure as one unit.

S&F in replacement cable jointing kit for 11000 volt earthed grade, outdoor, end termination heat shrinkable type joints with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 240sqmm complete all as specified & directed.

Supply, laying, jointing, testing and commissioning in replacement HT XLPE cable (heavy duty), 11000 volts (earthed), cross sectional area 240Sqmm, 3 core, insulated, screened, sound compacted aluminium conductor, screening with extruded semi conducting layers, insulation screening with copper tape covers laid up with PVC (ST-2), extruded inner sheathed GI strip armoured PVC (ST-2) out sheathed, ISI marked with IS-7098 Part II with amendment, laid in trenches /pipes /ducts /along poles/ walls/ equipment etc complete all as specified & directed. Notes: (i) Cable shall be of manufacturing date not earlier than Sep 2021. All the cable shall be embossed with year of manufacturing, meterage at every metre, in addition to its own standard markings as per IS i.e. Size, voltage etc. (ii) Excavation & earth work, sand cushioning, end termination joints, protection pipes & protection covers shall be measured and paid separately. (iii) No straight through joint shall be permitted in less than single drum length. (iv) The contractor shall produce original purchase vouchers duly machine numbered alongwith excise duty gate pass of factory for verification and record. (v) Cable shall be tested in the presence of rep of Accepting Officer at the factory premises and in the presence of GE or rep of GE after laying in the trenches & before returning filling in the trenches.

S&F in replacement cable jointing kit for 1100 volt earthed grade, indoor / outdoor, end termination heat shrinkable type joints with jointing material and accessories suitable for 3.5/4 core XLPE armoured aluminium conductor cable of size 150sqmm complete all as specified and directed.

Supply, installation, testing & commissioning HT 11KV, 3 phase 50 hertz, 3 wire, indoor type, floor mounted, horizontal drawout, horizontal isolation type, totally enclosed metal clad, prewired, independent type Vaccum Circuit Breaker(VCB), capacity 630 Amp rating, incommer VCB connecting with copper busbar of appropriate capacity duly insulated, motor operated, spring charged having rupturing capacity of 350 MVA, comprising of the following undermentioned asscessories including providing suitable foundation for VCB as per manufacturer's instruction complete all as specified and directed:- (a) Housing for circuit breaker carriage -01 No. (b) Mechanical interlock and automatic safety shutter gear including padlocking arrangement - 01 No. (c) Isolating plugs - 06 Nos. (d) 18.4KA at 11KV, 630amp VCB comprising of the following:- (i) Assembly of 3 vaccum interrupters complete with epoxy support insulators and self aligning finger type isolating contacts. (ii) Hand & motor operated (220 volt AC) spring charged, independent starting crossing /tripping trip free operating mechanism with manual closing and tripping push buttons and mechanical break closed / open spring charged/discharged indication.

(m) 3 phase RYB indicator with lamps - 01 No. (n) TNC switch - 01 No. (o) Trip circuit healthy indication lamp with push button- 01 No. (p) Inbuilt integral earthing. (p) Inbuilt arrangement for continuous DC supply as per manufacturer's recommendation for the system. (r) Common busbar having inbuilt alarm/hooter/barrer system. (s) Battery bank of suitable capacity for 11 KV VCB -02 Nos. Notes:- (i) Rate of cutting in existing VCB, modification of existing busbar for matching with new busbar will be to be includied in the quoted rates. (ii) The drawings in respect of VCB shall be approved by Accepting Officer through GE and as & when requested by contractor before placing order to manufacturer (iii) VCB shall be tested by representative of Accepting Officer at factory premises before dispatch as & when requested by contractor. (iv) The testing and commissing of the VCB shall be carried out in presence of Electrical Inspector as & when requested by contractor.

Excavation in trenches not exceeding 1.5mtr wide and not exceeding 1.5mtr in depth for foundation etc or for walls, shafts, manholes not exceeding 10 sqm on plan or for laying pipes/cables etc and getting out, in soft/loose soil complete all as specified & directed.

Returning filling in including spreading leveling watering and well ramming in layers not exceeding 25 cm thick each in soft/loose soil complete all as specified & directed.

Removal of excavated soil to a distance not exceeding 50 mtr & depositing where directed at a level not exceeding 1.5 mtr above the starting point complete all as specified & directed.

M&L Sand cushioning to cable with a layer of sand 8 cm deep before laying the cable and 15 cm deep after laying the cable (punned down to 18 cm depth after laying and stretching of cable ) complete all as specified & directed.

M&L un-reinforced precast concrete cable cover, Class HV type-1, flat, size 300mm x 180mm x 40mm, laid flat for protection of cable, adjacent to each other, perpendicular to central axis of cable complete all as specified & directed.

Supply and laying old size, common burnt clay, sub class 'B' bricks, designation 75, laid flat & dry for protection of cable , adjacent to each other, perpendicular to central axis of cable complete all as specified and directed.

For Credit Schedule refer tender documents. The amount of credit schedule shall be deducted in total quoted amount of BOQ to arrive contract sum.

R D Bansal

Raman Electric Trading Co

BEHL AND COMPANY

M/S BALWINDER SINGH