Military Engineer Services Tender

SCHEDULE 'A'

Supply, & installation, testing and commissioning out door type, trolley mounted step down transformer, 11KV/ 433 Volts ( At no load) AC 3 ph, 50 Hz, energy efficient level - 2 confirming to IS 1180 (Part-I), capacity 500 KVA , core type, double copper wound, oil immersed, naturally cooled, oil natural- air -natural (ONAN), Class A insulation lamination CRGO(M-4 grade) 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 +/- 5% on HV side to be changed by means of hand operated off load tap changer gear. The maximum temperature rise should not exceed 45 degree C (IS 1180) in oil and 55 degree C in HV /LV windings when measured by resistance method after continuous full load run on an ambient temp of 45 degree C and shall also comprise of the following:- (a) 01cable box chamber on HV side( primary) consisting of 03 Nos bushing with copper rods complete with nuts and washers, with 01 No cable gland suitable for HT cable. (b) 01 cable End box on LV side( secondary) consisting of 04 Nos bushing with copper rods complete with nuts and washers, with 01 No cable gland suitable for LT cable. (c ) Oil conservator tank with filter type drain plug and oil level gauge.

(d) Dehydrating breather with first fill of silica gel. (e) Explosive vent, thermometer pocket on tank cover, oil level gauge, 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) 100 mm dia, dial type thermometer, vapour pressure type, having range 0-120 degree C for monitoring temperature of oil (OTI) and winding (WTI) with metal guard having maximum perimeter temperature 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. (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.