Turbine Control

 

The Exitech Turbine Control system has predicted real life response for the initial control installation in a major utility.  Exitech was able to save the customer time and money because of its detailed design of circuits and hydraulics.  All control systems are different, but here is an example of the Exitech Turbine Control features modeled.

Pressure Control Unit

This module determines the values, discrete and analog, determined by the pressure control unit, including both pressure amplifiers of the EHC System.

  • SENSED THROTTLE PRESSURE
  • PRESSURE SETPOINT BIAS
  • PRESSURE SETPOINT
  • HIGH VALUE GATE
  • LEAD/LAG NETWORK
  • PRESSURE CONTROL UNIT INDICATING LAMPS
  • PRESSURE CONTROL UNIT METERS

Speed Control Unit

This module determines the values for the speed control unit of the EHC System.

  • SPEED SELECTOR CIRCUIT LOGIC
  • ACCELERATION SELECTOR CIRCUIT LOGIC
  • SPEED REFERENCE CIRCUIT
  • WOBBULATOR
  • SPEED REFERENCE CIRCUIT
  • ACCELERATION REFERENCE CIRCUIT
  • SPEED DIFFERENTIATOR CIRCUIT
  • ACCELERATION ERROR
  • ACCELERATION ERROR INTEGRATOR
  • SPEED ERROR / ACCELERATION ERROR HIGH VALUE GATE
  • SPEED CONTROL UNIT LAMPS
  • PRESSURE SETPOINT BIAS
  • PRESSURE SETPOINT
  • HIGH VALUE GATE
  • LEAD/LAG NETWORK
  • PRESSURE CONTROL UNIT INDICATING LAMPS
  • PRESSURE CONTROL UNIT METERS

 

Load Control Unit

This module determines the logic and normalized outputs of the load control unit of the EHC System.

  • POWER LOAD UNBALANCE CIRCUIT
  • LOAD REFERENCE CIRCUIT LOGIC
  • LOAD REFERENCE MOTOR POSITION (RVDT)
  • CONTROL VALVE AMPLIFIER OUTPUT
  • LOAD LIMIT LOGIC CIRCUITS
  • CONTROL VALVE CIRCUIT BOARD INPUT
  • INTERCEPT VALVE AMPLIFIER OUT (A50)
  • LOAD SELECTOR INDICATING LAMPS
  • LOAD CONTROL UNIT METERS

Bypass Control Unit

This module determines the values for the Bypass valve amplifier ( card A60 ) and the combined maximum flow limit amplifier ( card A63 ) for the EHC System.

  • DC CONTROL BUS STATUS
  • FLOW ERROR SIGNAL
  • BYPASS VALVE POSITION REFERENCE
  • HIGH VALUE GATE
  • MAXIMUM COMBINED FLOW LIMIT
  • LOW VALUE GATE
  • LOW CONDENSER VACUUM LIMIT CIRCUIT
  • BYPASS VALVE JACK INDICATING LAMPS
  • BYPASS CONTROL UNIT METERS

 

Valve Control Units

This module is the valve control unit module for the EHC simulation system. It processes signals from the Speed Control Unit, Load Control Unit, Pressure Control Unit, and Bypass Control Unit, and the Turbine Trip System to compute control valve, bypass valve, stop valve, and intercept valve positions.

  • SHELL/CHEST WARMING LOGIC
  • MAIN STOP VALVE TEST RELAYS
  • MAIN STOP VALVE #2 EXTRA RELAYS
  • MAIN STOP VALVE SOLENOIDS
  • MAIN STOP VALVE HYDRAULIC FLUID PRESS, NORMALIZED
  • MAIN STOP VALVE 2 POSITION
  • MAIN STOP VALVE 1 POSITION
  • MAIN STOP VALVE 3 POSITION
  • MAIN STOP VALVE 4 POSITION
  • MAIN STOP VALVE INDICATING LAMPS
  • CONTROL VALVE TEST LOGIC
  • CONTROL VALVE SERVO CONTROL RELAY LOGIC
  • CONTROL VALVE FAST ACTING RELAY LOGIC
  • CONTROL VALVE FUNCTION GENERATOR
  • CONTROL VALVE POSITIONS
  • CONTROL VALVE TEST INDICATORS
  • BYPASS VALVES
  • IV/ISV VALVE TEST RELAYS
  • IV VALVES SLOW CLOSE
  • IV VALVES FAST CLOSE SOLENOIDS
  • IV-1 POSITION
  • IV-3 POSITION
  • IV-5 POSITION
  • IV-2/4/6 POSITION
  • ISV VALVE SOLENOIDS
  • ISV POSITIONS
  • SERVO AMP READINGS ON LOSS OF POWER
  • VALVE CONTROL UNIT METERS

 

Turbine Trip System

This module is the turbine trip system module for the EHC simulation system. It computes the status of the EHC trip system.

  • MAIN CONDENSER VACUUM TURBINE TRIP
  • LOW OIL PRESSURE TRIP
  • EXHAUST HOOD HIGH TEMP TRIP
  • MOISTURE SEPARATOR HIGH LEVEL TRIP
  • HIGH VIBRATION TRIP
  • HYDRAULIC FLUID PRESSURE LOW
  • TURBINE RESET SIGNAL
  • REACTOR WATER HIGH LEVEL TRIP
  • BACKUP OVERSPEED TRIP
  • NO EHC DC POWER INPUT
  • LOSS OF STATOR COOLANT TRIP
  • REMOTE TURBINE TRIP
  • OVERSPEED TRIP TESTING AND RESET
  • TURBINE TRIP
  • TURBINE TRIP SYSTEM INDICATING LAMPS

 

EHC Outputs

This module set the outputs required for the EHC system.

  • OVERSPEED TRIP
  • BACKUP OVERSPEED TRIP
  • TURBINE MASTER PUSHBUTTON TRIP
  • EHC HYDRAULIC FLUID LOW PRESSURE TRIP
  • THRUST BEARING WEAR/BRG OIL LOW PRESSURE TRIP
  • CONDENSER LOW VACUUM TRIP
  • OVERSPEED TRIP LOCKOUT
  • OVERSPEED TRIP LOCKOUT
  • LOSS OF STATOR COOLANT TRIP
  • OVERSPEED TRIP RESETTING
  • EMERGENCY TRIP PRESSURE LOW PRESSURE TRIP
  • SHAFT PUMP DISCHARGE LOW PRESSURE TRIP
  • EHC LOSS OF 125VDC TRIP
  • EXHAUST HOOD HIGH TEMP TRIP
  • REACTOR WATER HI LEVEL TRIP
  • MOISTURE SEPARATOR HI LEVEL TRIP
  • TURBINE STOP VALVE CLOSED
  • TURBINE HI VIBRATION TRIP
  • EHC LOSS OF 24V DC TRIP
  • TSI LOSS OF TRIP VOLTAGE
  • TSI LO VOLTAGE FAILURE
  • EHC 125V DC SOURCE TRANSFERRED
  • EHC ELECTRICAL MALFUNCTION
  • 2 OF 3 LOGIC LOSS OF FUSE OR TRIP SENSOR MALFUNCTION
  • HP SHELL HIGH PRESSURE
  • TRIP RELAY LOW VOLTAGE OR 386 PROT RELAY TRIP
  • POWER/LOAD UNBALANCE TRIP
  • BYPASS VALVE OPEN
  • STOP VALVE TEST IN PROGRESS