PROVN OF 2 X 250 KVA TRANSFORMER WITH ANCILLARIES FOR NOC AND BUILDING UNDER CONSTRUCTIONUNDER GE (U) ELECT SUPPLY DELHI CANTT-10

Supply, installation, testing and commissioning of transformer step down, outdoor type copper wound Level-III ,IS 1180, 11KV/433 Volts (at no load) AC 3 phase 50 Hz 250 KVA capacity, core type, oil immersed naturally cooled, oil natural air natural (ON/AN) , with external colling tubes, delta connected on primary side (HT) and star connected on secondary side (LT) in accordance with vector group DYn-11 with neutral brought out on secondry side (LT) and having taping at ±10% in steps of 2.5% on HT side to be changed by means of hand operated off load tap changer. The maximum temperature rise should not exceed 40 degree celsius in oil and 45 degree celsius in HT/LT winding when measured by resistance method after continuous full load run on an ambient temp of 40 degree celsius 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/IEC 60076and as per IS-1180 part - I of 2014 marked, Including the cost of PCC/RCC foundation including necessary framework & fencing in perimeter location for placing of TRANSFORMER complete all as per IE/IS specification 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 washer with cable glands suitable for reception / taking out 3 core 185 Sqmm, 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,for connected bus ducts complete with nuts and washers, with cable glands suitable for reception / taking out single core 400 sqmm, LT 1100 volts grade, XLPE insulated and PVC sheathed, heavy duty, armoured cables including jointing materials complete. (c ) Conservator with filter type drain valve and oil level guage. (d) De-hydrating breather with first fill of dehydrating agent (Silica Gel). (e) Explosive vent, Thermometer pocket on tank cover, oil level guage, Oil drain filter valve, Lifting lugs,oil filling hole with cap/plug with connection plate complete, Air release valve plug and four nos plain solid cast steel detachable rollers. (f) One no 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 upto 50x6mm 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 earthing for neutral. (k) First fill of new and unused transformer oil, IS-335 marked, filtered and tested upto 40 KV dielectric strength at 2.5 mm air gap between testing electrodes. (l) Providing adequate size and nos of channels, embeded in floor, for movement of transformer. (m) Tranformer losses shall not exceed the loses mentioned in IS: 1180(2014) Part - I with energy Effeciency level - III. (n) Oil temperator indicator, winding temperature indicator, marshalling box single window, double flit buchhols relay with alarm and trip contact including connection to existing RMU relay with PVC insulated PVC sheathed cable galvanized steel strip or wire armoured electric control cables (Heavy duty) with stranded copper conductor of size 1.5 sq mm 10 core 1100 volts grade. Note:- (i) Foundation drawings need to be provided by OEM/contractor for transformer and need to be approved from accepting officer/Engr-in-charge. (ii) Factory testing costing deemed to be included in quoted rate. Factory testing should be carried out in presence of representative of accepting officer along with Engr-in-charge. (iii) The following test also required to be done by the contractor (a) Impulse Test (b) Heat Run Test (c) zero phase sequence test (d) Short Circuit test

Supply, installation, testing and commissioning of 11 KV, 630 Amps, 21 KA/3 sec outdoor type Ring main unit (RMU) fully motorized IP 54 protection plug in type extensible on one side SF6 gas insulated (4 way) with metering plate form mounted compact switch gear consisting of 02 Nos load break switch as incommer and 02 Nos outgoing VCBs , all live parts, bus bars VCB will be enclosed in robotically welded minimum 2.5 mm thick stainless steel tank filled with manometer fixed, SF 6 gas IP 67 Degree of protection and tested for internal arc 20 KA/1 sec as per latest IEC 62271-200 complete installed on plateform as recommended by OEM, including the cost of PCC/RCC foundation for placing of RMU on plinth complete all as specified and directed. The unit shall include the following with all necessary standard fitting required at site & the cost of PCC/RCC foundation for placing of RMU on plinth complete all as specified & as directed by Engineer-in-charge.

(A) Incoming Load Break Module - 02 Nos each switching unit shall be designed as a three position switch. This three function switch combines the functions of switch disconnector and earthing switch cables switch 12 KV, 630 Amp, 21 KA - 01 Set. Snap action mechanism for motorised and manual (Both) operation with integrated earthing switch - 01 Nos. Cable bushing 630 Amp standard C bushing - 01. Fault passage indicator, On N load break switch where N= no of load break switch >>s/c & E/F FPI with digital display to be added for detection of cable fault. ON, OFF, EARTH mechanical indication on the front mimic of the panel - 01. Capacitive voltage indication fixed type LED display - 01. ON, OFF, TRIP mechanical indication on the front mimic of the panel - 01. Cable box for termination of cable up to 1 No. x 120 sq.mm - 01.Cable cover standard - 01. Set of 12kV Cable Termination Boots - 01. Cable entry bottom, front - 01

(B) Out going VCBs - 02 Nos consisting of following - function unit consist of vaccum circuit breaker in combination with a three position switch. The three position switch fulfills the operation of the disconnector function and earthing function circuits breaker unit is equipped with an current transformer for the protection of distribution Transformer vaccum circuit breaker 12 KV, not less than 630 A, 21 KA - 01. Spring assisted closing with stored Energy triping mechanism for motorised operation with integrated earthing switch - 01. live cable LED indicators through capacitor voltage dividers mounted on the bushings push button for breaker trip - 01 sec O/C + E/F self powered numerical protection relay with low and High set for Over current and earth fault Relay should have facility to display the maximum loaded phase current also current also relay shall record minimum 5 fault records with time stamping - 01 Alarm trip indication 6 window annunciator for transformer faults Mechanical ON/OFF/EARTH indication -01.

Supplying, laying, jointing testing and connecting of XLPE insulated, screened, PVC bedded, galvanised steel strip or wire armoured, electric power cable (heavy duty) of size 95 sqmm x 3 core with multistranded aluminum conductors, 11 KV(E) grade, IS 7098 marked, laid in trenches fixed to pole, including jointing & testing complete all as specified.

Supply and Laying 400 Sqmm 3.5 Core XLPE insulated armoured heavy duty electric cable with aluminium conductor 1100 volts grade ISI marked as per IS 7098-1 laid in trenches ducts or fixing or passing through HDPE/DWC pipe across the road/path/drains/ along wall/floor/equipment etc complete all as specified and as directed.

-Ditto- all as per item No 4 above but of size 3.5 Core 185 Sqmm

-Ditto- all as per item No 4 above but of size 3.5 Core 95 Sqmm