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Brown Boveri, Double Extraction Back-Pressure, 1982, 21.4 MW, 1450 PSIG, 3600 RPM

Description

  1. Overview
    1. Turbine: Brown Boveri (BBC) double extraction back-pressure turbine, year 1982
    2. Generator: Brown Boveri (BBC) type WX14L-032-LLT, year 1982
    3. Exciter: Brown Boveri (BBC) brushless exciter type WBT 74/188-22 AO, year 1981
    4. Permanent magnet generator type WPE 35-9-4R20
    5. Voltage regulator: Brown Boveri (BBC) Unitrol, year 1981
    6. Control systems: Brown Boveri (BBC) / Bently Nevada, year 1981 and newer
    7. Lubrication systems: Rexroth / Alfa Laval / others, year 1982 and newer
    8. Switchgear: GE, complete
    9. Battery pack, UPS, and motor control center: GE, complete
  2. Turbine Specifications
    1. Power: 21.4 MW
    2. Current inlet pressure/temperature: 1450 psig / 950°F
    3. Current extraction/exhaust pressure: 400 - 150 psig / 50 psig
    4. Max inlet flow: 330,000 lbs/h
    5. RPM: 3600
    6. Weight: N/A
    7. Running time: 0 hours since overhaul in June 2012
    8. Overhaul dates: majors in June 2012, 2004, 1998
  3. Generator Specifications
    1. Power: 24 MVA
    2. Power factor: 0.85
    3. RPM: 3600 (direct coupling)
    4. Voltage/phase/Hz: 13.8 kV / 3 / 60
    5. Current: 1004 A
    6. Weight: 80,770 lbs
    7. Cooling: Internal air-cooled from under generator with water cooling system from Perfex
    8. Total loss dissipation rated at 540 kW
  4. Exciter Specifications
    1. Rated output / ceiling output (max 10 s): P = 151 kW / 268 kW, U = 165 V / 220 V, I = 915 A / 1220 A
    2. Field current (Ifw): 12.5 A / 19 A
    3. Field voltage (Ufw): 57 V / 87 V
    4. RPM: 3600
  5. Permanent Magnet Generator Specifications
    1. Type: WPE 35-9-4R20
    2. Output (P): 8.6 kVA / 11 kVA
    3. Power factor (cos φ): 0.5 / 0.8
    4. Frequency (F): 120 Hz
    5. Voltage (V): 407 V
    6. Current (U): 12.2 A / 15.6 A
    7. RPM: 3600
  6. Voltage Regulator Panel Content
    1. Dual channel VR: Unitrol K16008
    2. Unitrol 3310-3313
    3. Integrator: Unitrol 0008
    4. Limitation regulator: Unitrol 0021
    5. Pulse regulator: Unitrol 0510
    6. Load angle limiter: Unitrol 1041a
    7. Limitation unity: Unitrol K3001
    8. Supervision for rotary rectifiers: type URGA
  7. Control Systems Functions
    1. The electro-hydraulic control and safety system opens or closes the various control valves as necessary to control speed and load, frequency, extraction pressures, and back-pressure in various combinations, depending on the desired performance mode.
    2. The system also provides necessary safety functions, preventing turbine overspeed, overpressure in HP, IP, and LP sections, and other hazardous conditions.
    3. Panel content includes display for pressure and temperature of inlet, extraction, and exhaust steam.
    4. Vibration monitor: Bently Nevada 3500
  8. Lubrication Systems Functions
    1. The oil supply system supplies oil at a controlled temperature and pressure and directs its flow to the bearings of the turbine, generator, and exciter.
    2. In addition, the system supplies oil to the four main bearings to lift the shaft during starting, stopping, and turning gear operation, and to cool the control fluid.