SPECIAL REPAIR AND REPLACEMENT OF TRANSFORMER AGAINST BER AND ALLIED SERVICES UNDER GE N MAMUN AT MAMUN MIL STN

Disconnecting electrically, dismantling and taking down transformer of capacity up to 400 KVA and shifting to MES store yard all as specified and directed.

Supply, installation, commissioning and testing of transformer step down, outdoor type, copper wound, oil cooled , 11/0.433 KV (at no load) with HT 3 phase and LT 3 phase 4 wires, AC ,50 Hz of capacity 100 KVA with off load tap changing in 7 Nos positions arrangement on HT side for a variation of secondary voltage +5% to -10% in steps of 2.5% "BIS marked & BEE star labelled", when measured by the resistance meathod after continuous full load run in ambient temperature 48 degree centigrade. Including suitable cable entry box on LT side and HT bushing on primary side complete in all respect with standard accessories and fittings confirming to IS 1180 2014. The transformer shall be complete with standard fittings all as specified als latest design (Level III) for transformer comprising of following :- (i) One cable box on HV side (Primary side) consisting 3 Nos porcelain bushing rods complete with nut, washers, cable, gland etc., (ii) One cable box on LV side(Secondary side) consisting 4 Nos porcelain bushing rods complete with nut, washers, cable, gland etc., (iii) Oil conservator tank with filter type drain valve and oil level gauge., (iv) De-hydration breather with first fill of de-hydrating agent(silica gel)., (v) Explosive vent, (vi) Thermometer pocket on tank cover, (vii) Dial type thermometer, vapour pressure type having range 0 to 120ºC with metal guard having maximum perimeter reading temperature indicaton with resetting device for transformer, (viii) Rating plate with terminal marking plate, (ix) Earthing terminal on tank and cover for fixing earth strip of size 32 x 6mm., (x) Oil level guage and Oil drain filter valve., (xi) Lifting lugs, (xii) Oil filling holes with cap/plug with connecting plate complete., (xiii) Air release valve plug, (xiv) Extra bushing for Neutral out side the cable box for independent earthing for neutral earth., (xv) First filling of fresh transformer oil confirming to relevant IS and tested up to 45 KV die electric strength. Note: Test certificate, purchase voucher of transformer and test certification of electric strength shall be submitted by the contractor after filling the oil from manufacturer.

All as per item No 2 here-in-above but transformer of capacity 315 KVA complete all specified and directed.

All as per item No 2 here-in-above but transformer of capacity 400 KVA complete all specified and directed.

Dismantling cross-arms of M.S. channel or angle sections etc. complete and setting aside for re-use with in 50m or for disposal for taking credit to contractor all as specified and as directed

Material and labour for Cross arms, bracings, supports, clamps and back plates fabricated from structural steel sections including nuts, bolts, washers, welding, bending cold or hot, drilling holes for bolts, in any shape or size as indicated or directed and inclusive of one primer coat, one under coat and one finishing coat of aluminium paint complete all as specified and as directed.

M&L for dismantling and taking out GOD switch any type/size all as spfd and directed.

Supply, installation, commissioning and testing 11 KV Air break switch, gang operated for current rating upto 200 Amps, triple pole, horizontal type, mechanically operated (mounted on insulator and steel frame) with accessories such as polymer insulator assembly (Set of 15 insulators), jumper conductor ACSR with operating mechanism worked from ground level complete including GI tubing of 20mm dia bore (heavy grade) alongwith drop out fuse and steel frame including application of two coats of aluminium paint over a coat of primer complete all as specified and as directed.

All as per Srl item No 8 here-in-above but gang operated switch for current rating upto 400 Amps complete all as specified and as directed.

Supply and fix cable end jointing kit for 11 KV grade cable for outdoor termination heat shrink type joint complete with jointing material and all accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 50 to 95 Sqmm complete all as specified and as directed.

Supply and fix cable end jointing kit for 11 KV grade cable for outdoor termination heat shrink type joint complete with jointing material and all accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 120 to 185 Sqmm complete all as specified and as directed.

S & F in replacement of Lightning arresters expulsion type complete with all fittings, transmission class, discharge capacity 65 Kilo amps suitable for 11000 Volts including brackets, clamps, nuts, washers and connecting complete all as specified and as directed.

M&L in replacement of danger notice plate of 1.6mm thick mild steel sheet, vitreous enamelled white, with letters, figures and conventional skull and bones in signal red colour and fixed with MS clamps, bolts and nuts of approved size 25x20cm for HT size all as specified and directed.

M&L for replacement of CT (3 sets) for protective relays with suitable ration class CT-200-100/1A, class 5P10, 2.5 VA for protection in RMU as per sample all as specified and directed.

Supply, laying, connecting, testing and commissioning of in replacement of cable HT 11 KV, Stranded Compacted Circular of size 150 sqmm Aluminium Conductor, single core, screen with extruded semi conducting compound, XLPE Insulated, Insulation screening with extruded semi conducting compound in combination with copper tape, Aluminium round Wire armoured, and overall PVC sheathed cable conforming to IS 7098 (Part- 2) 2011 (edition) for using on GOD structure complete all as specified and as directed.

Disconnecting, dismantling and taking down earthing any type all as specified and directed.

Material & labour for earthing complete with galvanised steel earth plate electrode of size 600x600x6.0mm thick, buried in ground (Earth pit not less than 2.25 mtr deep below ground level) with top edge of the plate not less than 1.50 mtr below normal ground level connected to galvanised strip 32x6mm by means of nut, bolts, check nuts and washer of galvanised iron all as shown in electrical plate No. 3, connected to earth test point all as specified on indicated including PCC pit in PCC (1:3:6) type C-1 cast iron/MS frame, 50mm thick pre cast RCC (1:1:5:3) nominal mixed cover slab reinforced with 8 mm dia mild steel deformed bar 15 C/C and suitable for handle of cast RCC (1:1:5:3) nominal mixed cover slab reinforced with 8 mm dia mild steel deformed bar 15 c/c and suitable for handle of 10mm round bar, funnel with wire mesh including GI tube 15mm bore "medium grade" for watering , copper lugs etc, GI protection pipe of size 40 mm bore "medium grade" including necessary excavation, earth work in any type of soil and disposal of spoil to a distance n. exc 50 M and including testing complete all as specified and directed.

All as per Srl item No 17 here-in-above but earthing complete and connecting to galvanized earth lead wire 4.00mm dia by means of bolts, nuts, check nuts and washers and earth lead protected with GI medium grade pipe 15mm bore dia complete all as specified and directed.

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