Special repair and replacement of 03 x transformer against BER at JAK LI RC under GE 970 EWS

Disconnecting electric outdoor/indoor transformer 11 KV capacity upto 600 KVA from HT/LT terminals and lowering down/getting out from 2/4 pole structure/plinth or from inside sub station to MES store yard complete all as specified and directed . Note : Rate is deemed to be inclusive of transportation, T&P and man power required.

Supply, installing, testing and commissioning of outdoor type plinth mounted step down transformer, 11 KV/433 Volts (at no load), Level -II, AC 3 phase 50 Hz, 630 KVA capacity, core type, double copper wound, oil immersed, naturally cooled, Oil Natural-Air Natural (ON AN), 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 Neutral brought out on secondary side (LV side) and having tapings at +5% to -10% in steps 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 40 degree celsius in oil and 45 degree celsius in HV/LV winding when measured by resistance method after continuous full load run on an ambient temp of 40 degree celsius. The transformer shall be of BOLTLESS core design. Transformer shall be double wound, core type with low loss, non ageing, high permeability PRIME GRADE, CRGO with M4 Grade or Better, perfectly insulated and clamped to minimize noise and vibrations. The transformer shall be IS 1180 (Part-I) : 2014 and shall comprise of the following :- (a) One cable box on HT side (primary side) consisting of three nos porcelain bushing with copper rods, complete with nuts and washers, with cable glands suitable for reception / taking out 3 core 120 Sq mm, HT 11000 volts grade, XLPE insulated and PVC sheathed, heavy duty, armoured cables including jointing materials complete. (b) One cable box on LT side (Secondary side) consisting of four nos porcelain bushing with copper rods, complete with nuts and washers, with cable glands. (c) Oil conservator with filter type drain valve and oil level guage. (d) De-hydrating breather with first filling of dehydrating agent (silica gel). (e) Explosive vent, Thermometer pocket on tank cover, Oil level gauge, Oil drain filter valve, Lifting lugs, Oil filling hole with cap / plug with connection plate complete, Airrelease valve plug and four nos plain solid cast steel detachable rollers. (f) One number 100 mm dia, dial type thermometer, vapour pressure type, having range 0-120 degree celsius with metal guard having maximum perimeter temperature reading indicator with re-setting device. (g) Two earthing terminals on tank cover to facilitate fixing of 50 x 6 mm galvanised 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 ething for neutral. (k) First filling of new and unused transformer oil, IS-335 marked, filtered and tested upto 60 KV dielectric strength at 2.5mm air gap between testing electrodes (l) Providing adequate size and nos of channels, embeded in floor, for movement of transformer. (m) Unidirectional roller wheel. (n) Other accessories as per manufacturer design. (o) Oil temperature indicator, winding temperature indicator, marshling box single window, double flit buchhloz relay with alarm and trip contact. Note : (i) Transformer shall be supplied inclusive of initial oil filling to appropriate level of insulation oil desired dielectric strength. Cost of Provn of plinth for transformer as per OEM drawing shall be deemed to be included in the cost quoted by the bidders and nothing extra shall be admissible. (ii) Transformer shall be inspected by an officer nominated by the accepting officer before despatch of the transformer with complete accessories at the factory premises. (iii) The technical details and drawing of transformer shall be got approval from Accepting Officer before the order is placed by the contractor.

All as Per item No 2 but capacity of Transformer is 315 KVA complete all as specified and directed.

All as Per item No 2 but capacity of Transformer is 200 KVA complete all as specified and directed.

Excavation in trenches not exceeding 1.5 meters wide and not exceeding 1.5 meters in depth for laying of cable and getting out in any type of soil including trimming the sides forming bottom surfaces to required level complete all as specified and directed

Returning, filling in including spreading, leveling, watering and well ramming in layers not exceeding 25 cms thick in each layer of soil complete all as specified and directed.

Removing surplus excavated material to a distance not exceeding 50 meters and depositing where directed at a level not exceeding 1.5 mtrs above the starting point complete all as specified and directed.

M&L sand cushisioning to under ground cable with a layer of sand 110 mm thick before laying of cable and 150 mm thick after laying of cable complete all as specified and directed. Note : Punned thickness of sand shall be measured and paid.

M&L brick well burnt locally available sub class'B' laid over sand cushioning to cable in trenches keping width of brick parallel to the length of cable complete all as specified and directed.

Supplying and laying reinforced precast concrete cable cover class HV, Type 1, flat, size 300mmx l80mm x 40mm to the length of cable complete all as specified and directed.