| 1 | Supply, installation, commissioning ,design, engineering, manufacture, inspection, painting and testing complete with all accessories of 4 MVA power transformer step down, outdoor floor mounted, double copper wound, 3 Phase, 50 Hz, AC including all standard accessories as per Latest IS, Oil immersed, ONAN (Mineral) IS: 335 confirming to IS-2026, Most economical losses external cooling tubes/ radiator cores type having no voltage ratio 33000/11000 volts Impedance % of 6.25 (corresponding to principal tapping) winding delta connecting on Primary side (HV Side) and star connected on secondary side (LV side) in accordance with vector symbol Dyn11 (vector Group) with neutral brought out on LV side and looping on HV side for continious output so as to alter/vary secondary voltage by (+) 5 to (-) 15% in equal 16 steps @ 1.25% to be changed by means of (OLTC) On Load Tap Changer of make CTR/OLG with Local / Remote opertion features along with RTCC Panel with AVR Relay for Auto / Manual Operation, Cable End Box with Rated Copper Bus Bars / Bimatallic Connectors shall be provided for the transformer on both HT/LT for Connecting 33 KV HT 3 core cable of Size 185 sqmm on HV Side and 11 KV HT 3 core cable of size 400 sqmm on LV side complete all as specified and directed. | 2.00 | Each Job |
| 2 | 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, core shall be purchased directly from manufacturer of core or from their accredited marketing network and not through any agent. Before placing order for procurement of transformer, the contractor shall submit the credentials in respect of the manufacturer of core and transformer shall be procured only after approval from GE in respect of name of manufacturer of transformer as well as manufacturer of core. The limit of termperature rise after continous full load runs as specified in IS/IEC 60076 shall be suitably adjusted to suit the ambient temperature of maximum 50 degree celsius prevailing at site including having following characteristics complete all as specified and directed.
The transformer shall confirm to the latest edition of applicable standard as follows :-
(i) IS-2026, for tests and tolerance of guarnteed Particulars,
(ii) IS-3639 for Fitting and accessories
(iii) IS-2099 for Bushing >1000V
(iv) IS-1271 for Electrical insulation classified by Thermal stability
(a) Winding
(i) HV Winding -Layer/disc winding
(ii) LV Winding-Helical/Disc winding
(b) Insulation Level
(i) HV-170
(ii) LV-70
(c) Insulation level (Power frequency with Stand KVrms)
(i) HV 70
(ii) LV-28 | | |
| 3 | (d) Temperature raise for the transformer should be 50/55 deg.C (oil/ winding Temp) at Av. Ambient Temperature of 50C
(e) Noise level for offered transformer will be as Per NEMA TR1 only
(f) over loading of the transformer should be of as per IS 6600 only
(g) transformer shall be of Class A insulation
(h) Primary painting of Zinc Phosphate.
(i) Tank pressure, Vaccum witstand capability & Minimum Clearances should be as per CBIP manual.
(j) Neutral CT 150/1 PS class to be provided
% Efficiency at 75 deg C/ Unity P.F
i) at 100% Load-------98.87
ii) at 75% load----------99.07
iii) at 50% Load--------99.23
% Regulation at Full Load
i) at Unity PF---------1.19
ii) at 0.8 PF ----------4.60
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| 4 | Notes:
(I) Quoted rates shall include the cost of tansformer, Baffel wall between the exsiting transformer and new provisined transformer, RCC Foundation designed as per the OEM recommendation based on the Soil Conditions of the Delhi Cantt Shankar Vihar Yard.
(II) Quoted rates shall include the cost of necessary power / control cables for operation of OLTC, PRV limit switches , WTI, OTI, Bucholz Relay from RTCC panel in side substation building to transformer.
(iii) Transformer shall be brought at site only after approval of GTP drawings and only after completion of installation of 33KV GIS Panels and Laying of 33KV cables i.e after completion of 70% of the work at site to avoid ideal laying / ingress of moisture / corrossion to transformer at Site which detoriates the life / warrenty and service of the transformer.
(iv) The OEM should have in house NABL accredited lab for testing.
(v) Core shall be CRGO core grade should be M-OH/ZDKH/TCH only and procurement Mill's Test Cerfificate shall be provided.
(vi) Quoted rates shall include the cost of IED microporcessor based differential relay for transformer protection alongwith control wiring to be installed in exiting control and relay panel of Shankar Vihar yard.
(vii) Quoted rates shall include the factory testing. Factory testing should be carried out in presence of rep of Accepting Officer along with Engineer-in-charge. | | |
| 5 | Supplying, installing, testing and commissioning of 33kV, 630A, 25KA /3 -sec, IAC, AFLR, Gas-Insulated type VCB Panel making arrangement IP 4X Indoor suitable, floor-mounted, complying to IEC 62271-200 for design, manufacturing and type-tested, including short time current for operator safety (IAC 25kA/1-sec), having 01 x Incomming +01 Bus coupler+with 01 bus raiser+02 Out Going all inside Gas-Insulated IP65 (partition class : partition of metal) SS 304 grade SS tank (2.5 mm thickness), flush-front mechanism having lockable access door with mounted bay-protection and control scheme, including LEDs, mimic etc. as prescribed below , also SCADA complying to IEC 61850 complete installed as recommended by OEM, including the cost placing of panel complete all as specified and directed. The unit shall include the following with all necessary standard fitting required at site & the cost of placing of panel duly integrated and compatible with existing 33 KV GIS panels at site, complete all as specified and directed comprising of the followings :- | 1.00 | Each Job |
