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Siemens, W251B11A, Combined Cycle Power Plant, 70MW, 50 Hz

Siemens, W251B11A, Combined Cycle Power Plant, 70MW, 50 Hz

Description

  1. Overview
    1. Complete 70 MW combined cycle power plant
    2. 50 Hz
  2. Gas Turbine
    1. Brand: Siemens Westinghouse gas turbine
    2. Model no: W251B11A
    3. Rating: 48,000 kW
    4. Speed: 5400 rpm
    5. Site conditions: ISO
    6. Operation hours since new: 100,174
    7. Operation condition: The turbine ran mostly at base load, thus the machine condition is very good. The unit’s all maintenance was carried out by OEM annually from the beginning and all maintenance reports are available. The major maintenance was performed in 2009 and the extended HGPI (hot gas path inspection) maintenance was performed in 2012. All compressor blades were also renewed as well as renewing turbine blades at extended HGPI maintenance. Turbine is almost zero hr.
  3. Gas Turbine Gearbox
    1. Mfgr: Lufkin Gears
    2. Model no: N3007C
    3. Ratio: 1.806:1
    4. Input rpm: 5418
    5. Unit rating: 115,267 hp
    6. Application factor: 1.43
    7. Application power: 80,460 hp
    8. Lubricant: AGMA lubricant
    9. Teeth profile: Involute
    10. Number of teeth on pinion: 67
    11. Number of teeth on gear: 121
  4. Gas Turbine Generator
    1. Mfgr: Brush Electrical Machines Ltd.
    2. Frame size: BDAX 7.290 ER
    3. Type: CRA
    4. Machine no.: 62056A-1G
    5. Relevant specification: IEC 34-3
    6. Rating: 56 MW / 65,882 MVA
    7. P.F.: 0.85 @ 56 MW
    8. Cooling fan capacity: 1080 m³/min
    9. Equipment weights: wound stator 59,239 kg, rotor and exciter arm 14,906 kg, exciter field 1,247 kg, miscellaneous 8,848 kg, total machine 84,240 kg
  5. Gas Turbine Start Motor
    1. Mfgr: Voith Transmissions Inc.
    2. VTI part / dwg no.: 0103280
    3. Torque converter model: Voith EL 7.5 YFG 2.2
    4. Customer outline dwg no.: N/A
    5. Customer order no.: 080116
    6. Voith outline dwg no.: 0103280
    7. Date of assembly: 10.08.1996
    8. Rated power: 1073 hp / 800 kW
    9. Rated speed (rpm): 2980
  6. Gas Turbine Transformer
    1. Type: DO 65000/34.5
    2. Rated power: 65 MVA
    3. Rated frequency: 50 Hz
    4. Cooling method: ONAN
    5. Phase: 3
    6. Applicable standards: TS-267 IEC 76
    7. Rated voltage: 34.5 kV / 11.5 kV
    8. Rated current: HV (1087.8 A), LV (3263.3 A)
    9. Insulation level: 170 kV / 70 kV
    10. Vector group (connection symbol): YN D 5
    11. Impedance voltage: 9.231%
    12. Short circuit time: 3 seconds
    13. Insulation class: A
    14. Weight of active part: 49.5 t
    15. Weight of oil: 10.25 t
    16. Total weight: 74.85 t
    17. Type of oil: Nynas Nytro 10 XT
    18. Outline dimension (m): 7.5 m x 3.6 m
    19. Height (m): 6 m
  7. Steam Turbine
    1. Refurbished before shutting down
    2. Model: Mitsubishi Heavy Industries, Ltd., Tokyo, Japan. Year 1999
    3. Type: Mitsubishi steam turbine, extraction mixed pressure condensing
    4. Output: max 25,000 kW
    5. Speed: 3000 rpm
    6. Main steam press.: max 1260 psia
    7. Main steam temp.: max 950 °F
    8. Mixing steam press.: 50-90 psia
    9. Mixing steam temp.: max 475 °F
    10. Exhaust steam press.: 1.5 inHga
    11. Operation hours: 92,377 hr
  8. Steam Turbine Generator
    1. Mfgr: Mitsubishi Electric Corporation
    2. Power: 29,059 kVA
    3. Voltage: 11,500 V
    4. Amper: 1459 A
    5. Power factor: 0.85 PF
    6. Frequency: 50 Hz
    7. Speed: 3000 rpm
    8. Phases: 3 phases
    9. Type: MB
    10. Rule: IEC-34-1
    11. Inlet air temp.: 40 °C
    12. Temp. rise limit: stator 84 °C, rotor 80 °C
    13. Voltage: 280 exc. volt
    14. Ampereage: 552 exc. amp.
    15. Year: 1999
    16. Cooling fan capacity: 660 m³/min
  9. Steam Turbine Transformer
    1. Type: DO 25000/34.5
    2. Rated power: 25 MVA
    3. Rated frequency: 50 Hz
    4. Cooling method: ONAN
    5. Phase: 3
    6. Applicable standards: TS-267 IEC 76
    7. Rated voltage: 34.5 kV / 11.5 kV
    8. Rated current: HV (418 A), LV (1255 A)
    9. Insulation level: 170 kV / 70 kV
    10. Vector group (connection symbol): YN D 5
    11. Impedance voltage: 9.156%
    12. Short circuit time: 3 seconds
    13. Insulation class: A
    14. Weight of active part: 20.50 t
    15. Weight of oil: 5.50 t
    16. Total weight: 35.15 t
    17. Type of oil: Nynas Nytro 10 XT
    18. Outline dimension (m): 4.5 m x 3.4 m
    19. Height (m): 4.3 m