UPGRADATION OF EXISTING TRANSFORMER FROM 160 KVA TO 250 KVA AND CONNECTED WORKS AT PGEP AND TRG AREA UNDER GE CHENNAI

Amount

REVISED BOQ UPLOADED ON 06 FEB 2023

SCH "A" PART-I (TRANSFORMER AND ALLIED WORKS)

Excavating in trenches, not exceeding 1.5m wide and not exceeding 1.5m in depth; for foundation, etc. or for shafts, wells, cesspits, manholes, pier holes, etc not exceeding 10 sqm on plan and getting out in any type of soil all as specified and as directed.

Earthwork is deemed to be carried out by manual method. However mechanised method may be adopted without any extra cost to the government.

Returning, filling in, including spreading, levelling, watering and well ramming in layers not exceeding 25cm in any type of soil complete all as specified and as directed.

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

Fine sieved excavated dry soil laid to required width of trench at bottom and top for cable cushioning all as specified and as directed.

(a) Punned thickness only shall be considered for measured.

(b) The soil used shall be free from sharp grains and deletrious materials like dry / decayed plants etc.,

Supply and laying well burnt bricks sub class 'B' in trenches for cable protection of U/G cable all as specified and directed by Engr-in-Charges.

Supply and laying Precast Reinforced cement concrete cable cover class HV, Type 1, with peak, size 300mmx l80mm x 40mm complete all as specified and as directed.

Supply, laying, connecting and testing XLPE insulated, armoured, heavy duty electric cable with aluminium conductor, 11000 volts grade, in trenches / drawn through pipe / fixed on walls / bare in road crossings / paths / drains / ducts / floors / fixed on poles / equipments of size 3 core 150 sqmm complete all as specified and as directed. Note:- (i) Earthwork, sand cushioning, protection for cable etc., as required shall be measured and paid separately. (ii) Lugs and glands shall be used appropriately wherever required while connecting cables to the panel board and the quoted rates are deemed be include for the same.

Supply, laying, connecting and testing XLPE insulated, armoured, heavy duty electric cable with aluminium conductor, 1100 volts grade, in trenches / drawn through pipe / fixed on walls / bare in road crossings / paths / drains / ducts / floors / fixed on poles / equipments of size 3.5 core 240 sqmm complete all as specified and as directed. Note:- (i) Earthwork, sand cushioning, protection for cable etc., as required shall be measured and paid for separately. (ii) Lugs and glands shall be used appropriately wherever required while connecting cables to the panel board and the quoted rates shall deemed be include this provision.

Material and labour for Cable jointing kit for 11 KV (Earthed) grade cable for outdoor termination heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 120 sqmm to 185 sqmm complete all as specified and as directed.

Material and labour for Steel tubing, galvanised, light grade, with all fittings such as bends, elbows, tees etc and clamps.,on walls., 100mm bore of pipe for cable protection complete all as specified and as directed. Note:- Earthwork, cutting across roads etc. as required shall be measured and paid for separately.

Material and labour for Danger notice plate of 1.6mm thick mild steel sheet, painted vitreous enamelled white, with letters, figures etc and conventional skull and bones in signal red colour and fixed with MS clamps, bolts and nuts of approved size, for HT, of 25x20cm size complete all as specified and as directed.

Supply ,Fabrication and installation of cable route indicator made out of 10 mm thick CI plate , oval shape of suitable size and embossed with Mark of " MES LT Cable " including 30 cm length angle iron support and embedded in and including PCC complete all as directed.

Material and labour for Test point terminal block made of gun metal or phophores bronze size 75x75x25mm, drilled and screwed including 3 Nos, 8 mm dia 25 mm long hex head screw complete including taking down old one all as specified and directed.

Material and labour for Aluminium Strip of size 25 x3.15 mm with nuts, bolts and washers,buried in ground including necessary excavation complete including taking down old one all as specified and as directed

Earthing complete with galvanised iron earth plate electrode 600mm X 600mm X minimum 6mm thick, with and including earthing of 32 mm x 6 mm GI strip protected by 40mm dia GI pipe light grade upto a length of 7.5m. The plate shall be buried directly in ground vertically to a depth not less than 2.25 metres below ground level with top edge of the earth plate at a depth not less than 1.5 metres below ground level, connected to earth lead as described here-in-before by means of bolts, nuts, washers and checknuts made out of galvanised iron or mild steel, earthing lead protected by as described here-in-before and connected to main switch board or main control board or electric pole all as shown on electrical plate No.3 of MES Sch Part-I including necessary earth work and excavation in any type of soil, plain cement concrete 1:3:6, type C1 chamber, reinforced cement concrete cover slab with locking arrangement and handle of 10mm dia MS round bars 450mm long, 1:2:4 type B1, 50mm thick with 8mm dia TMT bars at 140mm centre to centre both ways, GI pipe of bore 20mm medium grade for watering with funnel, wiremesh, salt, charcoal, lugs including testing and complete all as specified and as directed.

Disconnecting the HT/LT cable connections from the transformer,dismantling the Transformer of 160 KVA,weighing appx 870 Kgs from the plinth and handing over the transformer safely to MES store yard located at appx 2.2 KM complete all as directed and as specified

Supply, installation, testing and commisioning of transformer platform/plinth mounted of capacity 250 KVA step down , BEE Star Rating 2 and above (energy efficiency level 2 and above), out door type, copper wound vector group DYN, 11/0.433 KV , AC, 3 phase, 50 Hz on secondary side double wounded , oil immerssed, naturally air cooled with external cooling tubes/radiator having tapping at (+/-) 2.5 %, (+/-) 5 % , (+/-) 7.5 % changed by hand operated off load tap changing gear the maximum temp rise not exceeding 40 Deg in oil and 45 Deg in HV/LV winding when measured by the resistance method after continous full load run in ambient temperature of 50 Deg and the transformer confirming to IS 1180 ( Part -I) 2014 amended up to date and comprising of following accessories :

(a) 3 Nos porcelain HV bushing with arcing horns on HV suitable for 11 KV complete with bushing rods , nuts and washers etc.

(b) 1 No cabale box on LV side consisting of 4 Nos porcelain bushing with bushing rods wahsers with cable gand of suitable size of reception of cable .

(c ) Oil conservator tank with filler type drain valve.

(d) Dehydrating breather aswsembly with frist filling of silica gel.

(e ) Explosive vent with double diaphram & sight galss

(f) Thermometer pocket on tank cover

(g) Two earthing terminals on transformer body to facilitate fixing of 32 x 6 mm GI strip .

(h) 1 No of thermometer dial type, vapour pressure type having range 0-120 Deg.

(j) rating and terminal making plate.

(k) Oil lever gauge

(i) Oil filling port on top cover with plate

(m) Air release valve

(n) Lifting lugs

(o) 4 Nos plain solid cast steel detachable rollers

(p) Extra bushing for neutral , outside the cable box for providing independent earthing

(q) First filling of new transformer oil conforming to relevent is and tested up to 60 KV dielectric strength at 2.5 mm gap.

(r ) Cooling valves

(s) Filter valves

Note : (i) Design/ drawing/ BOM of the transformer showing the dimensions is to be obtained from OEM/Auth supplier & is to be got approved from the GE before placing final order to the manfacturer (ii) Quoted rate is deemed to be inclusive of factory inspection / test of the transformer before dispatch by an officer nominated by the Accepting officer. The cost of necessary foundation /platform/PCC plinth as required at site as per OEM recommendation is deemed to be included in the quoted rate (iii) Technical specifications which are not described above but technically required for efficient working shall deemed to be included in the quoted rates. (iv) Original Purchase vouchers to be submitted to the Engr-in-Charge before claiming any payment by the contractor

G.L.THIRUMALAI NAIDU AND COMPANY

EVEREST ENGINEERING WORKS

MONA GENERATOR SEVICES PVT. LTD.