BANGLADESH POWER DEVELOPMENT BOARD TENDER ... - BPDB

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6.4 INSULATORS AND WIRING MATERIALS6.4.1 INSULATORS(1) Type and requirementsa. The insulator assembles shall consist of suspension insulator discs,hardware, strain or suspension clamps as required.b. The suspension insulators shall he of ball and socket type and shallconform to the requirement of IEC 120.c. The insulator unit shall be standard 254 mm porcelain disc type or fogtype 254 mm porcelain disc type, and have a spacing of 146 mm between discs.d. Total creepage distance of the insulator assemblies shall not be less than3300 mm.e. The insulators shall be wet-process porcelain of the highest glade, denseand homogeneous. The glaze shall be smooth, hard, dense and uniform and shallnot be effected by weather or sudden change in temperature, salty atmosphereand lighting during certain periods of the year. Colour of porcelain surface shall bebrown. All ferrous metals shall be galvanised except for female thread andstainless steel. Each insulator shall bear symbols identifying the manufacturer andindicating the year of manufacturer and tension proof test load.(2) Characteristics of Suspension Insulatorsa. Porcelain disc diameter : 254 mmb. Unit spacing : 146 mmc. Minimum electromechanical failing load : 21000 Kgd. Dimension of ball socket and pin : Conform to IEC(3) Characteristic of Insulator Assembliesa. Nominal system voltage : 230kVb. Highest system voltage : 275 kVc. Creepage distance not less than : 3300 mmd. Breaking strength of complete set : 1200kge. System insulation level- Basic impulse insulation level(1.2120 micro sec.) : 1050 kV peak- Power frequency withstands voltage(For 1 mm.): (As per relevant IEC) kV6.4.2 FITTINGThe suspension and tension clamps for bus works and outgoing feeders, tensionclamps for overhead grounding wires, U-bolts, ball eyes, anchor shackles, etc. forwiring of switchyard shall be furnished by the contractor. Unless otherwisespecified, all hardwire fittings shall be made by malleable iron or forged steel hotdip galvanised or aluminium alloy.Ghorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)68
All metal shall be free from rust, burrs, sharp edges, lumps and dross and shall besmooth so that interconnecting parts will fit properly and the parts may beassembled and disassembled easily. Hardware shall have ultimate strengthsexceeding three (3) times tension load of bus work and overhead ground wire.The cramps shall not be occurred in excessive heating by magnetising or othercauses.6.4.3 STANDARD CONDUCTORS FOR OVER HEAD LINES(1) 850 mm 2 , hard drawn aluminium conductorThe hard down aluminium stranded conductor of 850 mm 2 shall be used for 230kV bus bars and for outgoing feeder circuit. The conductors shall comply with therequirements of IEC .(2) Galvanised Steel WireThe galvanised steel wire of 55 mm 2 shall be used as overhead grounding wire.(3) Spools for ConductorsThe spools for conductors shall be made of steel and treated against corrosionand rust, and the following marking shall be indicated on an appropriate side ofthe spool.- Conductor number- Kind and cross sectional area of conductor- Conductor length- Spool weight- Name of manufacturer or abbreviation- Date of production- Position of beginning of conductor- Direction of rotation of spool- Indicator showing the remaining length of conductor6.4.4 MISCELLANEOUS MATERIALSAll miscellaneous materials such as phase mark plates, angle steel, C-shapedsteels, conduit pipes, cable cleats, bolts, nuts, and other materials for completionof the switchyard shall be provided by the Contractor.Ghorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)69
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Volume - 2Technical RequirementsSec
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GHORASAL 200 MW to 300 MW GAS TURBI
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2. Scope Of Work2.0 Scope of work2.
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3. Generator switchgeara. Outdoor e
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Rated frequency: 50 HzRated nominal
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Lighting impulseWithstand voltage(1
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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 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 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
Page 102 and 103: 10 DC POWER SUPPLY SYSTEM10.1 BATTE
Page 104 and 105: float charge as well as boost charg
Page 106 and 107: Section 11Lighting And Small Power
Page 108 and 109: 11. LIGHTING AND SMALL POWER SUPPLY
Page 110 and 111: (ii)Three phase plug socketOutdoor-
Page 112 and 113: Section 12Fuel Handling FacilitiesG
Page 114 and 115: 12. FUEL OIL SYSTEM AND HANDLING FA
Page 116 and 117: 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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