BANGLADESH POWER DEVELOPMENT BOARD TENDER ... - BPDB

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The wiring shall be connected at the terminal blocks terminating the outgoingcontrol cable. The flexible tube of the vapour tension thermometer shall becovered by a protective tube.(8) Insulating oilThe insulating oil shall have a sufficient insulation strength, and shall be excellentin heat conductivity, low in viscosity and pour point, and high in flash point. Theoil shall not cause any corrosion to insulating materials and structured materials ofelectrical equipment and shall be chemically stable for long years of use.Delivery shall be made to Site partly contained in the transformers and partly insteel drums, according to the method of packing employed. An excess of 10% ofthe quantity of oil required for filling transformers shall also be supplied and itscost shall be included in the price of each transformer.(9) Skid BaseThe transformer shall be provided with a skid base with four (4) steel wheels andnecessary jacks for setting and appropriate devices for locking in position of itsfoundation.5.2 GENERATOR STEP-UP TRANSFORMERS5.2.1 TYPE AND RATIOThe transformer shall be of single phase, oil immersed, self cooled / forced aircooled (ONAN/ONAF) by cooling fans, outdoor use type. Ratio of delta starconnection shall be 11 KV to 230 KV on full load condition.The connection of the three phase bank shall be arranged in vector symbol Ynd11according to IEC 74-4 and neutral of star connected high tension winding shall besolidly grounded.The on load tap changer shall be provided on the high tension winding, and theirratio shall be as follows:230 kV(±1.25% x 8)5.2.2 OUTPUT AND REQUIRED NUMBERSThe maximum continuous rating of the transformer shall met at any taps a totaloutput of the generator which is connected with the transformer in series asshown in the attached single line diagram.The self cooled capacity shall not be less than 75 % of forced air cooled capacity.5.2.3 IMPEDENCE VOLTAGEImpedance voltage (+ve seq.) shall be within the range of 15% to 18% on theforced air cooled rating on the rated tapping (11/230 KV ) and shall beguaranteed by the Contractor.Ghorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)50
5.2.4 WINDING AND INSULATIONThe full installation shall be applied on both 230 KV (phase & neutral) and 11 KVwindings and neutral point of 230 KV windings shall be solidly grounded.The winding conductors shall be of high conductivity copper.The insulation shall be designed not merely by normal voltage per turn, but alsoby variation of line voltage and the operating conditions including impulse surgecaused by lightning strokes on the transmission line and switching surges.5.2.5 ON LOAD TAP CHANGERThe on load tap changer shall be provided on neutral side of 230 KV winding andshall be designed to meet the requirement of IEC 76. OLTC shall be of MR,Germany or ABB, Sweden only. Provisions shall be made for padlocking in any tapposition.5.2.6 CABLE BOX/Isolated & Insulated Phase Bus DuctThe cable box shall be provided on each transformer so as to cover the 11 KVterminals and 11 kV power cables down to ground surface. Proper cable supportsand cleats shall also be provided.Isolated and Insulated Phase Bus Duct shall be provided from Generator terminalto Generator circuit breaker and Generator circuit breaker to LV side of UnitTransformers.5.2.7 PHASE & NEUTRAL CIRCUIT CURRENT TRANSFORMERCurrent transformer shall be provided on the high tension neutral circuit forRestricted Earth Fault & Stand by Earth Fault relays and ratio should match withphases (LV & HV) Differential protection circuit. If necessary Inter-posing currenttransformers may be used.1) Use : Protection2) RatingsRated primary currentRated secondary currentAccuracy classRated burden: 400 - 800 A(depends on rating of transformer): 1 A: 5 P20:15 VA3) Requirements for characteristics and ConstructionThe current transformer shall be designed to meet the requirements of latest IECstandard.Ghorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)51
Page 2 and 3: Volume - 2Technical RequirementsSec
Page 4 and 5: GHORASAL 200 MW to 300 MW GAS TURBI
Page 6: 2. Scope Of Work2.0 Scope of work2.
Page 9 and 10: 3. Generator switchgeara. Outdoor e
Page 11 and 12: Rated frequency: 50 HzRated nominal
Page 13 and 14: Lighting impulseWithstand voltage(1
Page 15 and 16: h. One (1) Lot Control and instrume
Page 17 and 18: 2.13 TestsThe Contractor shall be r
Page 19 and 20: Section 3Power Plant ArrangementGho
Page 21 and 22: 3.0 Power Plant Arrangement3.1 Gene
Page 23 and 24: 3.3.2.4 Compressor Wet Washing Syst
Page 26 and 27: The distillate fuel oil system shal
Page 28 and 29: 6. Sump tankThe sump tank allows dr
Page 30 and 31: provide necessary protection for ma
Page 32 and 33: 4. Generator And Ancillary Equipmen
Page 34 and 35: 4.1.4 Temperature RiseThe temperatu
Page 36 and 37: 4.1.12 Accessoriesa. Temperature de
Page 38 and 39: - Secondary wiring including cable
Page 40 and 41: 4.3.6 Voltage TransformerThe voltag
Page 42 and 43: 3) The rated service voltage shall
Page 44 and 45: Section 5TransformersGhorasal 200 M
Page 46 and 47: 5. TRANSFORMERS5.1 GENERALThe trans
Page 48 and 49: . The tank shall be of the welded s
Page 52 and 53: 5.3 UNIT AUXILIARY TRANSFORMER5.3.1
Page 54 and 55: h. Anchor devicei. Oil preservation
Page 56 and 57: 6. 230 kV OUTDOOR SWITCHGEAR, EQUIP
Page 58 and 59: -Power frequency withstand voltage(
Page 60 and 61: eaker.(6) Dielectric Test Voltagea.
Page 62 and 63: . Rated insulation level- Lighting
Page 64 and 65: f. Unless otherwise specified, the
Page 66 and 67: 6.3.2 DESIGN CRITERIAThe steel stru
Page 68 and 69: 6.4 INSULATORS AND WIRING MATERIALS
Page 70 and 71: Section 76.6 Kv SwitchgearAndLow Te
Page 72 and 73: 7. 6.6 kV SWITCHGEAR AND LOW TENSIO
Page 74 and 75: - Number of circuit :Determined by
Page 76 and 77: Section 8Control And ProtectionGhor
Page 78 and 79: 8. CONTROL AND PROTECTION EQUIPMENT
Page 80 and 81: - Automatic synchronising equipment
Page 82 and 83: ee. AVR failure xff. Emergency Trip
Page 84 and 85: can be seen through the window with
Page 86 and 87: Required no. of 6.6 kV and 415 V vo
Page 88 and 89: 8.10.3 CONTROL EQUIPMENT(1) Transmi
Page 90 and 91: The test block shall be of the back
Page 92 and 93: Section 9Cabling And GroundingGhora
Page 94 and 95: 9. CABLING AND GROUNDING9.1 GENERAL
Page 96 and 97: 9.2.4 CONTROL AND INSTRUMENT CABLES
Page 98 and 99: 9.4 CABLE ERECTIONConcrete lined ca
Page 100 and 101:
Section 10DC Power Supply SystemGho
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10 DC POWER SUPPLY SYSTEM10.1 BATTE
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float charge as well as boost charg
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Section 11Lighting And Small Power
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11. LIGHTING AND SMALL POWER SUPPLY
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(ii)Three phase plug socketOutdoor-
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Section 12Fuel Handling FacilitiesG
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12. FUEL OIL SYSTEM AND HANDLING FA
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from unloading base to the fuel tan
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13. FIRE PROTECTION FACILITIES13.1
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System of lock off to (but not exit
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Section 14Communication FacilitiesG
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14. COMMUNICATION FACILITIES14.1 GE
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(2) General CommunicationWhen the o
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(1) BatteryType of batteryCapacityN
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15. MAINTENANCE FACILITIESPage15.1
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15.1.4 RATINGThe rating of the cran
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The main power supply shall have a
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Static tests of all automatic seque
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Section 16Tests And InspectionsGhor
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16 TESTS AND INSPECTIONS16.1 GENERA
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subjected to the following tests by
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c. Stranded Conductors for Overhead
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days from the receipt of the said n
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circuit of unit motor control centr
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Special measures may have to be tak
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Checks shall be made of the local a
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Section 17Civil WorksGhorasal 200 M
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17.9 Sewage Works17.9.1 General17.9
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17.1.4 SITE LABORATORYThe Contracto
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where directed by the Board extra s
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approval regarding the re-measureme
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igidly in position down to the lowe
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on piles together with the apparatu
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than 15 cm in size containing suita
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aggregates shall be washed prior to
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17.6.13 FORMWORK AND TIMBERINGFormw
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he Contractor shall repair at his o
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Sieve designationPercentage by(Squa
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(b) Transverse Joints: The transver
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17.7.2 Gravel SurfacingThe Contract
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extended with sufficient number of
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A written record of the drilling in
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) Control EquipmentThe control equi
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17.12.2 GatesSliding metal gates of
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18 Building WORKS18.1 General18.1.1
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18.1.4 RecordsThe Contractor shall
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FrameRoofExterior wallPartition wal
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18.5 Materials And Workmanship18.5.
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(7) PaintPrior to delivery after sh
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oof cladding shall be less than 1.1
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. Wooden doorsPlywood for panelThic
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The terrazzo is to be trowelled to
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to suit. Stud shall be formed of ap
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Section 19Spare PartsGhorasal 200 M
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19. SPARE PARTS19.1 GENERALThe Cont
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BACKGROUND INFORMATION:Bangladesh P
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- Overhauling of all electrical mot
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3. BASIS OF PRICE3.1 Basis of price
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the delayed services or such other
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13. GENERAL CLAUSES CONCERNING TERM
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17. INSURANCEThe insurance includin
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Appendixes20.1 Site Layout20.2 Grid
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BANGLADESH POWER DEVELOPMENT BOARD TENDER ... - BPDB

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