PROVN OF SERVO TRASFORMER OF 200 KVA AND ALLIED WORKS FOR STABILIZED POWER SUPPLY AT AF STN BAGDOGRA UNDER GE (AF) BAGDOGRA.

Supply, installation, testing and commissioning of AC 3 Phase 50 Hz 200 KVA capacity transformer step down, outdoor type 11000/433 volts (at no load) copper wound, oil immersed, naturally cooled with external cooling tubes, core type, delta connected on primery (HV) side and star connected on secondery (LV) side in accordance with vector symbol DYN-11 (vector ground-4) with neutral brought on secondery (LV) side and having tapping in equal steps of 2.5% from (+) 5% to (-) 7.5% on primary side by means of hand operated off load tap changing gear, so as to change/correct L.T voltage secondery side conforming to IS 1180 Part-I 2014 (Level- II) including provision of all necessary stranderd fittings and mainly comprising of the following:- (a) Primary H.T Side having HT procelain bushing 03 Nos with brass gun metal bushing rods complete with nuts and washers. (b) One cable box on secondery (LT) side consisting of 04 Nos porcelain bushing with GM bushing rod complete with GM nuts and washers with one No cable gland suitable for reception of outgoing LT XLPE sheated armoured cable of size 120 sqmm 3.5 core (c) Oil conservator with filter type drain valve and oil level guage. (d) Dehydrating with breather with first fill of dehydrating agent. (e) Exlosive vent. (f) Thermometer pocket on tank cover (g) One no 100 mm dia dial type thermometer vapour pressure type having range 0-120 degree centrigrade with lamp reading pointer, max temperature indicator and resetting devices. (h) Rating plate with terminal markings. (j) Two earting terminal on tank/ tank coner to faciliate fixing of 32 x 6 mm GI/Copper eart strip. (k) Oil level guage. (l) OIl drain and filter valves. (m) Lifting lugs - 01 set (n) Under carriage with 04 nos of plain rillers (o) First fill of transformer oil and result of transformer insulation oil minimum upto 45 KV with 2.5 gap. Note:- The rate quoted against above shall included rail section and chennal embeded in foundation of suitable size necessary excavation/earthwork/PCC platform of 3 mtr x 2 mtr x 0.5 mtr Size

Supply, laying & testing cable XLPE insulated, screened, PVC bedded, galvanized steel strip or wire armoured, electric power cables (heavy duty) with stranded aluminium conductor, 11000 volts grade, of size 3 core 95 sq mm complete all as specified and directed.

S&F cable jointing kit for 11 KV grade cable for out door termination heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE, armoured, Al conductor cable of size 95 Sqmm complete all as specified and directed.

Supply, fixing, testing and commissioning of air break gang operated device (GOD), triple pole mechanically operated outdoor type, mounted on and including 11 KV H.T. porcelain insulators and steel channel frame, GI operating rod, 25mm dia of suitaale length with operating mechanism working from ground level, vertically operated including locking arrangement for operating handle, suitable for current rating upto 200Amp, 11000 Volts working pressure complete all as specified and directed.

S&F of Steel tubular swaged poles complete with cast iron base plate, finial taper plug, bolts, nuts and screws as specifiedtype 410 SP-55 (11.00 metres long) complete all as specified and directed.

M&L in replacement Earthing complete with galvanized steel earth plate electrode 60 cm X 60 cm X 6.3 mm thick buried directly in ground (earth pit not less than 2.25 mtr deep below normal ground level) with top edge of plate not less than 1.5 mtr below ground level connecting to the GI strip 32 x 6mm, by means nut bolt, nuts, check nuts and washer of the GI Earth wire protected by provision of GI light grade pipe 40 mm incl provision of concrete pit in PCC (1:2:4) type B-1 using 20 mm graded stone aggregated with 40 mm thick cover with RCC (1:2:4) reinforced with XPM (weight not less than 4 Kg / Sqm) and frame of angle iron 25mm X 25 mm X 3mm with lugs 2 Nos and with 6 mm dia MS bar handle made to shape, GI light grade 20 mm bore pipe for watering perforated at bottom 1.75 mtr long placed on top edge of earth plate, common salt and charcoal filling, taste point made out of phosphorus bronze with fixing arrangement, funnel, wire mesh and earth work in hard/dense soil, returning filling in and removal of surplus soil to a distance not exceeding than 50 mtr, all as per electric plate No 3 of SSR Part I 2009 and connection to earth test point all as specified incl testing on completion”.

Supply, laying and testing cable XLPE Insulated ,screened, PVC bedded, galvanized steel strip or wire armoured, electric power cables (heavy duty) 1100 Volts grade with stranded aluminium conductor of size 120 Sqm 3.5 Core complete all as specified and directed.

Supply, Testing and commissioning of Voltage stabilizer for automatic operation, three phase naturally oil cooled indoor type & designed for input variation between 340 V to 460 V with output voltage stabilized at 415 with accuracy ± 2.5% and speed of correction 8 Volts per second and of capacity 200 KVA complete all as specified and directed.

Excavation in trenches not exceeding 1.5 m wide and not exceeding 1.5 m in depth for taking out pipe line etc for repairs / laying cables etc and getting out in soft / loose soil complete all as specified and directed.