Military Engineer Services Tender

Supply & installation, testing and commissioning out door type, floor mounted step down transformer, 11KV/ 433 Volts ( At no load) AC 3 ph, 50 Hz, energy efficient level - 3, Amendment No.04,2021,confirming to IS 1180 of 2014 (ISI maked and BEE Approved), capacity 500 KVA ,copper winding,oil immersed, naturally cooled, oil natural- air -natural (ONAN), Class A insulation with external cooling tubes, delta connected on primary side (HV) and star connected on secondary side( LV) in accordance with vector group Dyn- 11 with natural brought out on secondary side (LV) and having tappings at +/- 2.5% to +/- 7.5% , 7positions, on HV side to be changed by means of hand operated off load tap changer gear. The maximum temprature rise should not exceed 40 degree C in oil and 45 degree C in HV /LV windings when measured by resistance method after countinuous full load run on an ambient temp of 50 degree C and shall also comprise of the following:-

(a) 01cable box chamber on HV side( primary) consisting of 03 Nos poreclin/epoxy bushing with copper rods complete with nuts and washers, with 01 No cable gland suitable for existing cable. (b) 01 box on LV side( secondary) consisting of 04 Nos epoxy bushing with copper rods complete with nuts and washers with cable glands.(c ) Oil conservator tank with filter type drain plug and oil level gauge. (d) Dehydrating brether with first fill of silica gel. (e) Explosive vent, thermameter pocket on tank cover, oil level guage, oil drain filter valve, lifting hucks, oil filling hole with cap/ plug with connection plate complete. Air release valve plug at four Nos plate soil cast steel detachable rollers. (f) 01 No 100 mm dia, dial type thermometer, vapour pressure type, having range 0-120 degree C with metal guard having maximum perimeter temperatre reading indicator with resetting device. (g) 02 Nos earthing terminals on tank cover to facilitate fixing of 50 x6 mm GI earth strip for earthing of body. Rating plate and terminal marking plate. (j) The transformer shall be complete with standard fittings incl plinth foundation for transformer mounting complete allas specified and directed by Engineer-in-charge. (h) Extra bushing for natural, in the LT cable box for providing independent set of earthing for natural.

(j) First fill of new and unused transformer oil, IS- 335 marked (make: savita / Power Oil) filtered and tested up to 60 KV die electric strength at 2.5 mm air gap between testing electrodes. (k) Providing adequate size and Numbers of channels, embedded in flour, for movement of transformers. (m) Provn for transformer fixing on trolley arrangement system (openable). (n) Provn of foundation to rest transformer all as per manufacturer instruction Note : Any left out standard accessories which are not mentioned above but required for smooth functioning of the transformer is deemed to be included in the quoted rate without any extra cost)