SPECIAL REPAIR FOR REPLACEMENT OF BER TRANSFORMERS OF HQ WAC AT SUBROTO PARK UNDER GE (AF) SUBROTO PARK, DELHI CANTT-10

Supply, installation, testing and commissioning of Indoor type, step down transformer 11KV/433 Volts (at no load) AC, 3 phases, 50 Hz, 400 KVA capacity, core type copper wound on HV & LV coil immerse, naturally cooled, oil natural-air natural (ONAN) with external cooling tubes, delta connected on primary side (HV) and star connected on secondary side (LV side) in accordance with vector group DYN-11 with neutral brought out on secondary side (LV side) and having 7 step tappings (Tapping Range ( + ) 7.5% in step of 2.5%) 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 Celsius, in oil and 55 degree celcius the transformer shall be in accordance with latest EEL- 3 of IS : 1180 (Part-1)-2014 with latest amendments and with BIS marked and BEE 3 Star label and comprise of the following :-

Ser No1.00 contd... (a) Three porcelain bushing suitable for 11KV on HV side with copper rods, nuts and washers and termination cable end box complete. (b) One cable end termination box LT side (secondary side) consisting of four nos. porcelain bushing with copper rods, complete with nuts and washers. (c) Oil conservator with filter type drain valve and oil level gauge. (d) De-hydrating breather with first fill of dehydrating agent (silica gel). (e) Vent thermometer pocket on tank cover, oil level gauge, oil drain filter valve, lifting lugs/hooks, oil filling hole with cap/plug with connection plate complete, air release valve plug and four nos plain solid cast steel detachable rollers with locking arrangements. (f) One no. 100mm dia, dia type thermometer, vapour pressure type having range 0-120 degree celsius with metal gaurd having maximum perimeter temperature dual (one resetable and one fixed) reading indicator with re-testing device. (g) Two earthing terminals on tank cover to facilitate fixing of 50x6mm galvanized iron earth strip for earthing of body. (h) Rating plate and terminal marking plate. (j) Extra bushing for neutral, in the LT cable box for providing independent set of earthing for neutral. (k) First filling of new transformer oil, IS-335 marked and tested up to 60 KV di-electric strength at 2.5 mm air gap between testing electrodes. (l) Base channel earthing terminals lifting lugs. Note : (i) Anything missed out above but technically required for proper operation of the transformer is deemed to be included in the quoted rate. (ii) Rates are inclusive for taking down existing 400KVA transformer and shifting to MES store yard as directed by Engineer-in-charge. (iii) Disconnecting the existing incoming and outgoing cable and re-connecting the same in new transformer.

Supply, installation, testing and commissioning of outdoor type, step down transformer 11KV/433 Volts (at no load) AC, 3 phases 50 Hz, 200 KVA capacity, core type copper wound on HV & LV coil, oil immerse, naturally cooled, oil natural-air natural (ONAN) with external cooling tubes, delta connected on primary side (HV) and star connected on secondary side (LV side) in accordance with vector group DYN-11 with neutral brought out on secondary side (LV side) and having 7 step tappings (tapping ray ( + ) 7.5% in step of 2.5%) 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 celsius in oil and 55 degree celcius the transformer shall be in accordance with latest EEL- 3 of IS : 1180 (Part-1)-2014 with latest amendments with BIS marked and BEE 3 Star label and comprise of the following :-

Ser No 2.00 contd... (a) Three porcelain bushing suitable for 11KV on HV side with upper rods, nuts and washer and termination cable end box completed. (b) One cable end termination box LT side (secondary side) consisting of four nos. porcelain bushing with copper rods, complete with nuts and washers. (c) Oil conservator with filter type drain valve and oil level gauge. (d) De-hydrating breather with first fill of dehydrating agent (silica gel). (e) Vent thermometer pocket on tank cover, oil level gauge, oil drain filter valve, lifting lugs/hooks, oil filling hole with cap/plug with connection plate complete, air release valve plug and four nos plain solid cast steel detachable rollers with locking arrangements. (f) One no. 100mm dia, dia type thermometer, vapour pressure type having range 0-120 degree celsius with metal gaurd having maximum perimeter temperature dual (one resetable and one fixed) reading indicator with re-testing device. (g) Two earthing terminals on tank cover to facilitate fixing of 50x6mm galvanized iron earth strip for earthing of body. (h) Rating plate and terminal marking plate. (j) Extra bushing for neutral, in the LT cable box for providing independent set of earthing for neutral. (k) First filling of new transformer oil, IS-335 marked and tested up to 60 KV dielectric strength at 2.5 mm air gap between testing electrodes. (l) Base channel earthing terminals lifting lugs. Note : (i) Anything missed out above but technically required for proper operation of the transformer is deemed to be included in the quoted rate. (ii) Rates are inclusive for taking down existing 200KVA transformer and shifting to MES store yard as directed by Engineer-in-charge. (iii) Disconnecting the existing incoming and outgoing cable and re-connecting the same in new transformer.

M & L in replacement for earthing complete with galvanized mild steel earth plate electrode 60cm x 60cm x 6mm thick buried directly in ground (earth pit not less than 2.25 Mtr below ground level) with top edge of earth plate not less than 1.5 Mtrs below ground level connected to GI strip 32x6mm as earth lead by means of nuts, bolts, thimbles, check nuts, washers of GI or steel, including PCC (concrete chamber) shall be PCC 1:3:6 type C-1 using 20mm graded stone aggregate, with fair finish internal surface of concrete chamber shall be given 15mm thick plaster in CM 1:4, funnel with wire gauge mesh, 80 mm thick RCC pit cover 320 mm x 320 mm of RCC 1:2:4 type B-1 using 20 mm graded stone aggregate reinforced with MS bar 8mm C/C 100mm MS handle made of 10mm MS bar and charcoal dust and common salt all as shown in electrical plate No 3 of MES SSR Part-I (2009) and specified including provision of GI strip protected by 40 mm dia light grade pipe and watering pipe shall be 20mm bore light grade, and including all excavation and earth work & connecting the earthing to an earthing test point complete all as specified & directed by Engr-in-Charge.

Supply and fixing in repair 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 32mm x 6mm complete all as specified & directed by Engr-in-Charge.