Tender Document for Repowering Project of Ghorasal 3rd Unit - BPDB

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Voltage 230/400 V(∆Y), 50 Hz RPM 1470 Current 227/131 Amps 2.6.13 Generator excitation system The turbo-generator of 210 MW unit of GPS utilises the quick static self excitation system with booster transformer in series controlled by sylicon valves (thyristor) and strong automatic excitation system. Stand by excitor Generator Motor Type BT 171-7 KT3 AC3-2-17-61-6T3 Power KW 990/3250 1250 Voltage V 470/840 6600 Current A 2100/3860 147 Speed rpm 990/970 990 2.6.14 Transformer (Unit step up transformer) & Circuit Breaker Unit no 3 consists of 2 Unit Step Up transformers of 125 MVA each. Also Air Blast Circuit Breaker (ABCB) used as Circuit Breaker. Sl Description Transformer-1 Transformer-2 1 Type TDU-125000/230-73TI TDU-125000/230-73TI 2 Rated Capacity 125 MVA 125 MVA 3 Rated Current 314/4600 314/4600 4 Rated Voltage 242±2X2.5%/15.75 KV 242±2X2.5%/15.75 KV 5 Short Circuit Voltage 11.2% 11.2% 6 Vector Group Y/Delta-1 Y/Delta-1 7 Circuit Breaker Air Blast Circuit Breaker Air Blast Circuit Breaker 2.6.15 Protection system Protection system of different equipment are used. 2.6.16 Battery/ DC system Unit consists of 230 V DC System. 2.7 Other electrical system a. One (1) lot of 400 V switchgear. b. Cables and wiring for interconnection between the equipment. 2.8 Emergency Diesel Generating Set One (1) set of emergency diesel generating set (capacity 1000 KVA at 0.8 p.f., 1500 rpm) complete with ancillary equipment having diesel storage capacity for 24 hours of continuous operation for supplying power to essential auxiliaries. EDG shall be of automatic starting system [compressed air/ Battery] including quick start & loading capability. The starting system shall be capable of carrying out at least five (5) consecutive start without auxiliary power supply. In case of power failure in Re-Powering Ghorasal 210 MW 3 rd Unit (Vol-2A of 2) 20
0.4 kV bus, EDG will start and supply power to 0.4 kV emergency bus in auto mode. EDG synchronizing facility with 0.4 kV live bus is also required. EDG is required for the safe shutdown of the plant/ equipment under emergency condition and in case of power failure for certain essential applications like battery chargers, emergency lighting and all auxiliaries necessary for safe coasting down of equipment and turning gear/ barring operation of the turbines. 2.9 Natural Gas Booster Compressors The plant shall require centrifugal type gas booster compressors (GBC manufacturer will be Man Turbo / Atlas copco, Country of origin will be Germany/ USA) as the supply pressure of natural gas is in the range of 80 - 150 psig. The capacity of the compressors have to be 3 x 60% for maximum gas requirement of the plant including auto changeover system without interrupting operation of the plant with rated pressure & flow and at all modes of operation & at any temperature prevailing in the site of the GTG unit. The gas booster compressors have to be centrifugal type, 6.6 KV motor driven. Appropriate control, sealing, cooling & anti-surge system with all necessary ancillaries and auxiliaries shall have to be provided including compressor house. 2.10 230 Kv Switchgear Equipment And Transformers (CC) (Based on 2:2:1 configuration) 2.10.1 230 KV Switchgear Equipment (1) One (1) lot of 230 kV circuit breaker 2) One (1) lot of 230 KV Current Transformers 3) One (1) lot of 230 KV Voltage Transformers 4) One (1) lot of 230 KV Lightning Arresters 5) One (1) lot of steel structures for supporting the switchgear, equipment, posts and beams and gantry structures. 6) One (1) lot of 230 kV XLPE (Single-Core) cable including supply, insulation, testing and commissioning with Two end Termination and One spare core (3+1) with necessary hardware from unit transformers to sub station [underground cable with RCC slab on three sides]. Cable should be single point bonding at source end but provision should be made for both ends with Link Box & Protective Device (Surge Voltage Limiter) for open end. 7) One (1) lot of suspension/post insulator string sets, tension insulator string sets and station post supporting insulator set with necessary hardware. 8) One (1) lot of shield wire connectors and necessary hardware. 9) One (1) lot with both end earth switch & One (1) lot of with single end earth switch} of 230 KV Isolators. Note: Please note that, Indicative Single line drawings are included with the tender document is for reference only. Tenderer shall design their S/S equipment on the basis of the requirement with the following voltage rating of the transformers. In Power Plant Sub Station provision is to Re-Powering Ghorasal 210 MW 3 rd Unit (Vol-2A of 2) 21
Page 1 and 2: BANGLADESH POWER DEVELOPMENT BOARD
Page 3 and 4: Section 1 Description of the Projec
Page 5 and 6: Section 2 Scope of Work Re-Powering
Page 7 and 8: 2.7 Other Electrical System 2.8 Eme
Page 9 and 10: 2. Scope of Work 2.0 Scope of Work.
Page 11 and 12: s. Cooling and ventilating system.
Page 13 and 14: Evaporator and Super-heater of the
Page 15 and 16: There are 3 (Three) feed water pump
Page 17 and 18: No of heater Heating surface Steam
Page 19: Description of Sealing Oil Pump(AC)
Page 23 and 24: • Rated low voltage : 6.6 kV •
Page 25 and 26: l. One (1) lot 230 KV Control & Rel
Page 27 and 28: in his supply, and shall provide ne
Page 29 and 30: 2.30 Effluent Treatment Plant Efflu
Page 31 and 32: 3. Power Plant Arrangement 3.1 Gene
Page 33 and 34: 3.2 Guarantee The steam turbine gen
Page 35 and 36: shall be operated from central cont
Page 37 and 38: 3.3.6 Closed circuit cooling water
Page 39 and 40: The generators shall be connected t
Page 41 and 42: given of the outside of the enclosu
Page 43 and 44: 4.0 Gas Turbine and Ancillary Equip
Page 45 and 46: 4.3.2.1 Vibration Critical Speed Th
Page 47 and 48: 2. Compressor wash water quality To
Page 49 and 50: 4.3.2.9 Air Inlet System The air fi
Page 51 and 52: Section-5 Heat Recovery Steam Gener
Page 53 and 54: 5. Heat Recovery Steam Generator an
Page 55 and 56: 5.1.9 Steam Purging Following acid
Page 57 and 58: (2) Chemical Feed Pipe The chemical
Page 59 and 60: 5.2.4 Economiser The economiser sha
Page 61 and 62: An approval system of safety valve
Page 63 and 64: (e) All special supporting hangers,
Page 65 and 66: 5.2.10 Valves All valves shall be o
Page 67 and 68: Sensors for temperature, pressure,
Page 69 and 70: prevent sticking and leakage. Suita
Page 71 and 72:
6. Existing Steam Turbine And Ancil
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Description of Shaft Turning Gear M
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RPM 1000 Current 222 Amps Stand by
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6.11 Valves 6.12 Generator There ar
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Power 22 KW Voltage 230/400 V(∆Y)
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RPM 1000 Current 53 A Description o
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Section 7 Gas Turbine Generator and
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7. Generator and Ancillary Equipmen
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aced, blocked and supported against
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discharge or suppress excitation fo
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(4) Safety shutters actuated by ins
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- Current transformer : Three (3),
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- Circuit breaker : One (1) for eac
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8. TRANSFORMERS 8.1 General 8.1.1 R
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a. 230 KV CIRCUIT - lightning impul
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(3) Oil Preservation System: Oil im
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The full insulation shall be applie
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±8x1.25%. 8.4.2 Output Each auxili
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9. 230 Kv Outdoor Switchgear, Equip
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(3) Ratings a. Rated voltage : 245
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fittings between each phase and con
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sealed Electromagnetic type voltage
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k. Each current transformer shall b
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9.3.2 DESIGN CRITERIA The steel str
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e. Step-bolts : one (1) lot f. “R
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Section 10 6.6 Kv Switchgear and Lo
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10. 6.6 kV SWITCHGEAR AND LOW TENSI
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Rated normal current Incoming and b
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Section 11 Control and Protection R
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11. Control and Protection Equipmen
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- Automatic synchronising equipment
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ee. AVR failure x ff. Emergency Tri
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One (1) lot One (1) lot One (1) lot
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(1) Pressure Measurement Pressure s
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11.11 DELETED. range of 85 % to 115
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shall be followed in the design of
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(namely that, of the approved DCS)
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The following functions must be rea
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11.11.7.5 Group Controls The auto-s
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The HP and LP steam pressure contro
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11.11.7.7 Operator Command and Supe
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(a) Commonality of equipment, facil
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Analog value storage of the Process
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Standard weather stations with all
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12. CABLING AND GROUNDING 12.1 Gene
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12.2.2. 6.6 kV XLPE POWER CABLES Th
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core type. The size of the conducto
Page 165 and 166:
Section 13 DC Power Supply System R
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13.0 DC and UPS Systems The DC and
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13.2 UPS Performance Static uninter
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14. Lighting And Small Power Supply
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c. The size shall be adequate to li
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The wall switches shall be of the e
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15. FUEL GAS HANDLING FACILITIES 15
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Section 16 Fire Detection & Protect
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16. Fire Detection & Protection Fac
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mm diameter. The underground pipewo
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17. Communication Facilities 17.1 G
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h. Operator intrusion into an estab
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Ammeter for measuring the emitter c
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• video matrix switcher and contr
Page 193 and 194:
18. Maintenance Facilities 18.1 Ove
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18.1.3 TYPE OF CRANE 18.1.4 RATING
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anchors and other electrical equipm
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18.1.10 SITE TESTS (1) Control and
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Section 19 Tests and Inspections Re
Page 203 and 204:
19. Tests and Inspections 19.1 GENE
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19.2.4 GENERATOR 19.2.5 EXCITER All
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"Voltage transformers” - General
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(3) Reliability Test Period a. The
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(4) Performance and Acceptance Test
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Insulation resistance test using 50
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ound copies of all site test sheet
Page 217 and 218:
Section 20 Civil Works Re-Powering
Page 219 and 220:
20.6.11 Transportation 20.6.12 Curi
Page 221 and 222:
20.1.3 SITE INVESTIGATION The Contr
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20.3 EARTHWORKS 20.3.1 GENERAL The
Page 225 and 226:
until the work has been inspected a
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the piles. Due consideration shall
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casing in concrete or such other me
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a+b+e or a+b+c+f or a+b+d+f 20.4.4
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approved standard. When required by
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20.6.11 TRANSPORTATION 20.6.12 CURI
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In a flight of stairs Rise 3 mm In
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20.7.1.2 Aggregate Sub-base Materia
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warping or cracking. When placing t
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(14) days. Ponding of the surface o
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Man-holes, inspection chambers and
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Colour of paint shall be as directe
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This pump shall be operated in conj
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20.11 Ducts The concrete ducts to i
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Section 21 Building Works Re-Poweri
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21. Building Works 21.1 General The
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adopted standards or codes shall be
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Outside temperature : 36 0 C Inside
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(6) Welding Procedure (7) Paint Det
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chips, gravel or crushed stone, or
Page 265 and 266:
pallets, and other hidden timber sh
Page 267 and 268:
21.5.9 Floor Laying (1) PVC Floorin
Page 269 and 270:
protection of the tiling from all d
Page 271 and 272:
Section 22 Spare Parts Re-Powering
Page 273 and 274:
22. Spare Parts 22.1 Spares & consu
Page 275 and 276:
BACKGROUND INFORMATION: Bangladesh
Page 277 and 278:
- Overhauling of all electrical mot
Page 279 and 280:
GENERAL CONDITIONS OF LTSA CONTRACT
Page 281 and 282:
8. LIMITATION OF LIABILITY 8.1 The
Page 283 and 284:
- Failing to pay the LTSA provider
Page 285 and 286:
the Head of the power plant. 16. CO
Page 287 and 288:
Section 23 Appendices Re-Powering G
Page 289 and 290:
Annexure -1 ANALYSIS OF NATURAL GAS
Page 291 and 292:
Indicative Single Line Diagram of E
Page 293 and 294:
Re-Powering Ghorasal 210 MW 3 rd Un
Page 295 and 296:
Page 297 and 298:
Page 299 and 300:
Standards for Industrial Effluent o
Page 301 and 302:
Page 303 and 304:
Page 305:
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Tender Document for Repowering Project of Ghorasal 3rd Unit - BPDB

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