SPECIAL REPAIR AND REPLACEMENT AGAINST BER-33/11 KV POWER TRANSFORMER AT SRIGANGANAGAR MIL STN

Excavating in trenches not exceeding 1.5 m wide and not exceeding 1.5 m in depth; for foundation, etc. or for shafts, wells, cesspits, manholes, pier holes, etc. or for cable laying or not exceeding 10 sqm on plan and not exceeding 1.5 m in depth and getting out in soft/ loose soil complete all as specified and as directed.

Returning, filling in, including spreading, levelling, watering and well ramming in layers not exceeding 25 cm in soft/ loose/ hard/ dense soil complete all as specified and as directed.

Removing excavated material (soils) not exceeding 50 m and depositing where directed at a level n exc. 1.5 m above the starting point

Supply, fixing and stringing ACSR (aluminium conductor galvanized steel-reinforced) of any size and type in accordance with site requirement and binding on insulator by means of 22 gauge aluminium binding wire to permissible sag complete all as specified and as directed.

S & F XLPE cable end termination, cold shrinkable, indoor type, suitable for voltage 6.35 kV/ 11 kV (Earthed), 3 core, 240 sqmm to 300 sqmm complete all as specified and as directed.

S & F XLPE cable end termination, cold shrinkable, outdoor type, suitable for voltage 6.35 kV/ 11 kV (Earthed), 3 core, 240 sqmm to 300 sqmm complete all as specified and as directed.

Supply, laying and testing cross linked polyethylene (XLPE) insulated, PVC sheathed cables for working voltages 6.35 kV/ 11 kV, three phase, earthed system, 3 core, screened, armoured power cable, 240 sqmm of nominal area of conductor, aluminium conductor, ISI marked as per IS 7098 (Part-II): 2011 and to be laid in trenches, under floors, through pipe laid under floors/roads and in trenches, through concealed GI pipe etc. making all connections with necessary glands, lugs, bushing complete all as specified and as directed.

M & L for earthing complete with copper plate earth electrode 600 mm X 600 mm X 3.15 mm thick, buried directly in ground (earth pit not less than 2.25 metres deep below ground level) with top edge of the plate not less than 1.5 metres below normal ground level, connected to earthing lead of 32 mm X 6 mm copper strip by means of bolts, nuts, check nuts and washers of galvanised iron from earth plate to test point upto 7.5 metre including all as shown in electrical plate No. 3 of SSR Part I (2009) including necessary concrete chamber in cement concrete M15 (Nominal Mix) using 20 mm nominal size coarse aggregate, precast RCC cover slab in cement concrete M15 (Nominal mix) using 20 mm nominal size coarse aggregate of size 40 cm X 40 cm X 5 cm reinforced with 8 mm dia TMT bars @ 150 mm c/c both ways with one handle for lifting made out of 8 mm dia bar, GI funnel, GI wire mesh filter, 20 mm dia GI pipe medium grade for watering, 40 mm dia GI pipe medium grade for protection of earthing lead, charcoal or coke and salt in alternate layers including necessary excavation and earth work in any type of soil/ strata and testing complete all as specified and as directed.

S & F earth continuity conductor or main earthing lead fixed to wall on batten or recess or chases or buried in ground or drawn in conduit/pipe or fixed to poles or any other indicated situation for loop earthing etc. as required 32 mm X 6 mm copper strip complete all as specified and as directed.

Supply and fix metal oxide surge arrester without gap for AC system as per IEC 60099-4: 2014, outdoor type, porcelain housing, single column and single phase construction, station class, heavy duty, nominal discharge current 20 kA, switching impulse discharge current 2 kA, repetitive charge transfer rating (Qrs) more than 2.4 C, thermal energy rating (Wth) more than 10 kJ/kV, nominal system voltage 11 kV, highest system voltage 12 kV, rated voltage of arrester 9 kV, continuous operating voltage 7.2 kV, temporary overvoltage (10.15 kV for 1 s, 9.50 kV for 10 s, 8.75 kV for 100 s), rated short circuit current 20 kA, low short circuit current 600 A, insulation withstand level (lightning impulse voltage 1.2/ 50 µs) 75 kV, lightning impulse residual voltage (8/20 µs) at nominal discharge current maximum 26 kV, switching impulse residual voltage (30/60 µs) at switching impulse discharge current maximum 21 kV, high current impulse withstand capability (4/10 µs) 100 kA, minimum creepage distance 300 mm complete all as specified and as directed.