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TECHINICAL SPECIFICATION FOR 5 MVA, 33/11KV ONAN POWER TRANSFORMERS1. SCOPE:1.1 This Specification provides for design, engineering, manufacture, assembly, stage inspection,final inspection and testing before dispatch, packing and delivery at destination Sub-stationby road transport, transit insurance, unloading at site /stores of 5 MVA, 33/11 KV PowerTransformer(s), complete with all fittings, accessories, associated equipments, spares, 10%extra Transformer Oil, required for it’s satisfactory operation in any of the sub-stations ofthe Purchaser.1.2 The core shall be constructed either form high grade, non-aging Cold Rolled Grain Oriented(CRGO) silicon steel laminations conforming to HIB grade with lamination thickness notmore than 0.23mm for M 3 and 0.27mm for HIV or better( Quoted grade and type shall beused). The maximum flux density in any part of the cores and yoke at normal voltage andfrequency shall not be more than 1.5 Tesla. The Bidder shall provide saturation curve of thecore material, proposed to be used. Laminations of different grade(s)_ and different thickness(s) are not allowed to be used in any manner or under any circumstances.1.3 The scope of supply includes the provision of type test. The Purchaser reserves the right to waivetype tests as indicated in the section on Quality Assurance, Inspection and Testing in thisspecification.1.4 The Power Transformer shall conform in all respects to highest standards of engineering,design, workmanship, this specification and the latest revisions of relevant standards at thetime of offer and the Purchaser shall have the power to reject any work or material, which,in his judgement, is not in full accordance therewith. The Transformer(s) offered, shall becomplete with all components, necessary for their effective and trouble free operation. Suchcomponents shall be deemed to be within the scope of supply, irrespective of whether thoseare specifically brought out in this specification and / or the commercial order or not.The purchaser reserves the right to reject the transformers if on testing the losses exceed thedeclared losses beyond tolerance limit as per IS or the temperature rise in oil and / orwinding exceeds the value, specified in technical particular or impedance value differ fromthe guaranteed value including tolerance as per this specification and if any of the test resultsdo not match with the values, given in the guaranteed technical particulars and as pertechnical specification. The Purchaser reserves the right to retain the rejectedTransformer(for minor fault) and take it into service until the supplier replaces it,by a newtransformer at no extra cost to the purchaser. The payment for the above shall be releasedafter supply of new Transformer complying all the stipulation of the Tender Document.Alternatively, the supplier shall repair(in case of minor repair which can be done at site) orreplace the Transformer within a reasonable period as decided by the purchaser topurchaser’s satisfaction at no extra cost to the purchaser. The payment shall be released aftersupply of new Transformer complying all the stipulations of the Tender Documents.2 SPECIFIC TECHNICAL REQUIREMENTS1 Rated MVA (ONAN rating) 5 MVA2 No. of phases 33 Type of installation Outdoor4 Frequency 50 Hz (± 5% )5 Cooling medium Insulating Oil (ONAN)34
6 Type of mounting On Wheels, Mounted on rails.7 Rated voltagea) High voltage winding 33KVb) Low voltage winding 11KV8 Highest continuous system voltagea) Maximum system voltage ratio (HV / LV ) 36KV / 12 KVb) Rated voltage ratio (HV / LV ) 33KV /11 KV9 No. of windings Two winding Transformers10 Type of cooling ONAN ( Oil natural / Air natural )11 MVA Rating corresponding to ONANcooling system12 Method of connection:HV:LV:100%Delta13 Connection symbol Dyn 1114 System earthing Neutral of LV side to be solidlyearthed.15 Percentage impedance voltage on normal tap % Impedance Tolerance %and MVA base at 75 0 C corresponding to HV/LV rating and applicable tolerances :7.15 + 10(No negative tolerance will beallowed)16 Intended regular cyclic overloading ofAs per IEC –76-1, Clause 4.2windings17 a) Anticipated unbalanced loading Around 10%b) Anticipated continuous loading of windings 110 % of rated current(HV / LV)18 a) Type of tap changer Off-load tap changer.b) Range of taping + 5% to – 15% in 9 equal steps of2.5% each on HV winding19 Neutral terminal to be brought out On LV side only20 Over Voltage operating capability and duration 112.5 % of rated voltage ( continuous )21 Maximum Flux Density in any part of the coreand yoke at rated MVA, rated voltage i.e 33KV / 11 KV and system frequency of 50 HZ1.5 Tesla22 Insulation levels for windings :- 33KV 11KVa) 1.2 / 50 microsecond wave shape Impulse170 75withstand (KV P )b) Power frequency voltage withstand (KV rms ) 70 2823 Type of winding insulationa) HV winding Uniformb) LV winding Uniform24 Withstand time for three phase short circuit 2 Seconds25 Noise level at rated voltage and frequency As per NEMA Publication No. TR-1.Star35
Page 2: CENTRAL ELECTRICITY SUPPLY UTILITY
Page 6 and 7: ,5.0 Schedule of Requirements & Del
Page 8 and 9: SECTION -IIINSTRUCTION TO BIDDERS (
Page 10 and 11: 5. BIDDING DOCUMENTS:5.1 The Scope
Page 12 and 13: 9.2.3 The bid security shall be in
Page 14 and 15: 16.3 The Bid shall contain no inter
Page 16 and 17: 24. PRELIMINARY EXAMINATION OF BIDS
Page 19 and 20: SECTION -IIIGENERAL TERMS AND CONDI
Page 21 and 22: 2.06 “Month” shall mean the cal
Page 23 and 24: 8.0 QUALITY ASSURANCE PLAN:8.1 The
Page 25 and 26: 10.0 PACKING AND FORWARDING:The equ
Page 27 and 28: 15.0 Deviation from Specification:I
Page 29 and 30: 22.02 The bidder shall quote the ba
Page 31 and 32: Force Majeure shall not include occ
Page 33: SECTION- IVTECHINICAL SPECIFICATION
Page 37 and 38: iii) Transformer shall under except
Page 39 and 40: performance of power transformers a
Page 41 and 42: 6.6 Internal design of transformer
Page 43 and 44: 6.13.7.2 Each coat of paint shall a
Page 45 and 46: 7.4.4 ( C ) For those bidders, who
Page 47 and 48: 7.6.8.5 The insulation of winding s
Page 49 and 50: vii) All applicable routine and typ
Page 51 and 52: iii) The marshalling box shall acco
Page 53 and 54: xxiv)xxv)xxvi)xxvii)b) Air release
Page 55 and 56: Govt. Approved Laboratory, if the t
Page 57 and 58: 8.2.1 Type Testb) Oil leakage test
Page 59 and 60: The Engineer authorized from CESU a
Page 61 and 62: 9 LIQUIDATED DAMAGES FOR EXCESSIVE
Page 63 and 64: SECTION -VLIST OF ANNEXURES( SCHEDU
Page 65 and 66: ANNEXURE - IIPROFORMA FOR COMPOSITE
Page 67 and 68: Annexure- IIIPrice Schedule for 5 M
Page 69 and 70: Tender Specification No. . CESU /P&
Page 71 and 72: Tender Specification No . CESU /P&S
Page 73 and 74: Tender Specification No . CESU /P&S
Page 77 and 78: Sl.NO.Tender Specification No. CESU
Page 81 and 82: ANNEXURE V (A)(TECHNICAL DEVIATION
Page 83 and 84: ANNEXURE VI(PERFORMANCE OF MATERIAL

techinical specification for 33/11kv onan power ... - Cescoorissa.com

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