Configurable TMR Steam Turbine Control System
The 3420 is a configurable steam turbine controller that utilizes proven Tricon V9 triple modular redundant (TMR) fault tolerant hardware for the control system platform. The system uses two-out-of-three voting to provide high-integrity, error-free, uninterrupted process operation with no single point of failure within the controller chassis.
The core turbine control program can be configured to start, warm-up, accelerate, and run most one- and two-valve steam turbines. It allows testing of overspeed trip devices and provides several options for tripping the turbine.
It is also programmable. The core control program can access half of the installed I/O. Custom programs can be added to the core control program to access the remaining I/O. These custom programs can be used to start and stop lube oil pumps, sequence of turning gear hydraulic system, or control a pressure reducing valve for the steam system. Compressor anti-surge control or generator voltage regulation can be added as well.
The 3420 provides automatic control of start-up, loading, and shutdown of both one- and two-valve steam turbines. Two-valve configuration allows control of extraction and/or induction applications. The 3420 has a number of control features that allow it to protect and control both the turbine and the driven equipment.
Package description
- 3420 Tricon chassis, I/O modules and power supplies
- External termination panels and interconnecting cables
- TriStation 1131 developer’s workbench software
- Steam turbine application software
- Configuration software
Available options
- Cabinet
- Field I/O power supplies
- Servo control
- TurboSentry overspeed trip system
- Integrated compressor surge control
- Integrated generator voltage regulation
- Full complement of turbine retrofit accessories including actuators, gears, magnetic pickups, and position indicators for both pneumatic and hydraulic solutions
Operator interface packages
- Vacuum luminescent operator panel
- Graphic HMI package with a flat screen for cabinet mounting
- Graphic HMI package with monitor and PC for table top location
Standard software features
- Turbine power load limiting
- Extraction and/or induction header pressure control
- Selectable priority (power or pressure) when controlling two-valve turbines
- Two critical speed avoidance ranges
- Warm/cold start-up settings
- User-definable start permissives
- Mechanical overspeed trip test setting
- Up to three hand valve control outputs
- Up to two speed switch outputs
- One stand-alone PID available to the end-user
Generator control features
- Automatic/manual synchronization and generator breaker closure
- Inlet pressure or back pressure override control if out-of-range
- Speed droop control
- Megawatt PID control in cascade
- Back pressure control
Mechanical drive control features
- Speed droop control
- Process PID control in cascade (choice of suction pressure, discharge pressure, or suction flow)
- Remote speed setpoint control
- Special inlet pressure/speed two-valve control (SASIPR)
Standard I/O
- 8 Pulse inputs
- 32 Analog inputs
- 32 Discrete inputs
- 8 Analog outputs
- 16 Discrete outputs