BANGLADESH POWER DEVELOPMENT BOARD TENDER ... - BPDB

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4.1.4 Temperature RiseThe temperature rise of the generator under the base and peak rating operationsat any ambient condition shall not exceed the values given below:at Baseat Peaka. Stator winding by resistance 95 0 C 100 0 Ctemperature detectors methodb Field winding by resistance method 100 0 C 105 0 Cc. Cores and mechanical parts incontact with or adjacent toinsulated winding by thermometer 95 0 C 100 0 Cd. Bearing when measured onthe surface 40 0 C 40 0 C4.1.5 InsulationThe insulation of the armature and field windings of the generator shallsatisfactorily withstand high voltage tests as specified in IEC standard. Insulationof the armature windings, field windings, and collectors shall be class F.4.1.6 StatorThe cores shall be made up of high permeability, low loss, stampings, tightlyclamped together to reduce noise and vibration to a minimum. All burrs oflaminations shall be removed after punching. Sufficient ventilation ducts to ensureuniform cooling shall be provided. Clamping of the laminations and securing to thestator frame shall be done by approved methods. Attention shall be given toprevent vibration being transmitted to the generator foundations or associatedequipment.Protective covers and air shields shall be made of steel plates, welded, stiffenedwith suitable angles and channels, and formed in segments for case of handling.The segments shall be bolted together and to the stator frame.The windings, terminals, and leads shall be fully insulated throughout and braced,blocked and supported against the single and three-phase short circuits fault atthe generator terminals under any operating conditions.The general construction of the stator and bracing of the winding overhand shallprovide adequate cooling surface and to avoid the hot stops. The stator coils shallbe either semi or completely pre-formed and shall be made up before insertion tothe slots.Ghorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)34
4.1.7 Generator LeadsThe neutral and output ends of each phase windings shall be brought out to thegenerator terminal cubicle.The generator neutral shall be grounded through suitable transformer withsecondary resistor.The connection between generator terminal and 11 kV generator switchgear &Unit transformers shall be 11 kV Isolated (insulated) phase bus duct.4.1.8 Bearing4.1.9 RotorBearings shall be pressure lubricated by pressured oil from the gas turbinelubricating oil system, and oil drain pipes shall be equipped with pockets forthermometer and suitable sight flow opening for observing bearing oil flow.The packing blocks used especially in the rotor winding shall be of approvedmaterial and entirely suitable for the high temperatures and mechanical forceswhich may cause on rotors.The rotor slot insulation shall be mainly of epoxy resin or other approved materialand particular attention shall be given to the insulating and securing of coil to coiland slip ring connections, if any, and to avoid vibration and the possible failure toeither the connector or its insulation.Adequate precautions shall be taken against local overheating of the rotor surfacewhen neutral short circuits and single phase loading and the Contractor shallsubmit data showing permissible single phase and unbalanced three phaseloading. The rotor shall be capable of withstanding an over-speed test of 1.2times rated speed for two minutes.If slip-rings are provided, a grinder for slip-ring maintenance shall be supplied bythe Contractor.4.1.10 Temperature DetectorsMore than nine (9) resistance type detectors shall be provided for monitoring ofgenerator stator winding temperatures. The detectors shall be built into thegenerator, fully protected from the cooling air, suitable distributed around thecircumstances, and embedded in the slots in positions normally having the highesttemperature in accordance with requirements of IEC standards. All detectors shallbe wired out to a terminal box.4.1.11 Insulation Against Shaft CurrentOne of the bearings shall be suitably insulated to prevent flow of shaft current.Ghorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)35
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 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 50 and 51: The wiring shall be connected at th
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
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can be seen through the window with
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Required no. of 6.6 kV and 415 V vo
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8.10.3 CONTROL EQUIPMENT(1) Transmi
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The test block shall be of the back
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Section 9Cabling And GroundingGhora
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9. CABLING AND GROUNDING9.1 GENERAL
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9.2.4 CONTROL AND INSTRUMENT CABLES
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9.4 CABLE ERECTIONConcrete lined ca
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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
Page 224:
Appendixes20.1 Site Layout20.2 Grid
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BANGLADESH POWER DEVELOPMENT BOARD TENDER ... - BPDB

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