SPECIFICATIONS
Part Number: IS200TPROH1A
Manufacturer: General Electric
Series: Mark VI
Product type: Turbine Protection Terminal Board
Country of Manufacture: United States (USA)
Functional Description
IS200TPROH1A is a turbine protection terminal board developed by GE under Mark VI control system. As part of an independent emergency overspeed and synchronization protection system, TPRO sends speed signals, temperature signals, generator voltage, and bus voltage to the VPRO.
Features
- System Architecture and Protection Design: The turbine protection system is built around three fully redundant VPRO boards, housed within a dedicated protection module that is physically and functionally isolated from the primary turbine control system. This triple-modular redundancy (TMR) architecture significantly enhances system reliability, ensuring uninterrupted protection even if a single component fails. The TPRO terminal board serves as the primary signal distribution point, feeding all three VPRO boards with identical, high-integrity input signals. This design guarantees consistent decision-making across all protection channels and supports voting logic for critical trip conditions.
- Trip Solenoid Control and Power Distribution: Trip solenoid actuation is managed through a coordinated arrangement of TREx and TRPx terminal boards.
- TREx boards (TREG, TREL, or TRES) control the positive side of the 125 V DC supply and are responsible for driving the trip solenoids.
- TRPx boards (TRPG, TRPL, or TRPS) manage the negative side of the 125 V DC circuit, completing the solenoid control path.
- The system supports connection of up to three trip solenoids between the TREx and TRPx boards, enabling multiple, independent shutdown paths for enhanced safety and compliance with turbine protection standards.
- This dual-board power handling approach ensures controlled, reliable energization and de-energization of the trip solenoids during both normal operation and emergency conditions.
- Emergency Overspeed and Trip Functions: The VPRO module is responsible for executing the emergency overspeed protection and emergency stop (trip) functions. Upon detecting unsafe operating conditions—such as excessive turbine speed or abnormal electrical parameters—the VPRO module immediately commands the trip solenoids to actuate, resulting in a rapid and controlled turbine shutdown. This fast response minimizes the risk of mechanical damage and protects both personnel and equipment.
- TREG Relay Management and Redundancy: Within the protection system, the VPRO module manages the TREG relay board, which contains 12 electromechanical relays.
- Nine relays are organized into three independent groups of three, each group dedicated to controlling one trip solenoid.
- The remaining relays are used for auxiliary protection and status signaling.
Installation Procedure
- The first terminal block of the TPRO board is wired to:
- Generator and bus potential transformers (PTs)
- Analog input signals
- Thermocouple inputs for temperature monitoring
- Magnetic speed pickups are connected to the second terminal block, providing precise turbine speed feedback to the protection system.
- Jumpers JP1A and JP1B are configurable to support either 4–20 mA current signals or voltage inputs on the first of the three available analog input channels, allowing flexibility to match site instrumentation requirements.
Operation
- The Primary function is to provide speed signals to the VPRO for the turbine's emergency overspeed (EOS) protection.
- TPRO also provides generator signals for backup synchronization check protection, three analog current inputs, and nine thermocouple inputs, primarily for gas turbine exhaust over-temperature protection.
- VPRO supplies TPRO with 28 V dc to power the three analog input transmitters.
Generator and Bus Voltage Sensors
- Two Single-Phase Potential Transformers, 115 V rms secondary.
- Voltage accuracy is 0.5% of rated Volts rms.
- Frequency Accuracy 0.05%.
- Phase Difference Measurement better than 1 degree.
- Allowable voltage range for synchronizing is 75 to 130 V rms.
- Each input has a load of less than 3 VA
WOC is happy to assist you with any of your GE requirements. Please contact us by phone or email for pricing and availability on any parts and repairs.
FREQUENTLY ASKED QUESTIONS
What is IS200TPROH1A?
It is a turbine protection terminal board developed by GE
How many VPRO boards are there in the system?
There are three redundant VPRO boards in the system, all located in a separate module from the turbine control system.
What is the role of TREx in the system?
TREx controls the trip solenoids (TREG, or TREL, or TRES) in the system.
What inputs does TPRO provide to the VPRO boards?
TPRO feeds speed signals, temperature signals, generator voltage, and bus voltage inputs to all three VPRO boards in the system.
What is the function of the TRPx terminal board?
The TRPx terminal board supplies the negative side of the 125 V dc to the trip solenoids in the system.
