The GE IS200TRPGH1BBA Gas Turbine Primary Trip Board is a safety-critical terminal board used within GE Industrial Control Systems for gas turbine primary trip applications. As a member of the TRPG board family, the IS200TRPGH1BBA Gas Turbine Primary Trip Board is controlled by the Primary Turbine Protection controller, either the VTUR board in Mark VI systems or the PTUR I/O pack in Mark VIe systems. The board contains nine magnetic relays arranged in three voting circuits to interface with three trip solenoids, and it works in conjunction with the TREG board to form the primary and emergency sides of the interface to the trip solenoids. The IS200TRPGH1BBA Gas Turbine Primary Trip Board also accommodates inputs from eight Geiger-Mueller flame detectors for gas turbine applications.
The IS200TRPGH1BBA Gas Turbine Primary Trip Board is identified by the GE part numbering convention used throughout the Industrial Control Systems product line. The "IS200" prefix identifies the board as a GE Industrial Control Systems product, with "200" specifically indicating that the board is a base-level assembly. The "TRPG" acronym identifies the board's functional designation as a Gas Turbine Primary Trip Board. The "H1" designation identifies the hardware group and the TMR application variant, while the "BBA" suffix identifies the artwork and functional revision combination. All digits are important when ordering or replacing any board, as boards of different revision levels may not contain identical hardware, and GE ensures backward compatibility of replacement boards while noting that different revision levels may not contain identical components.
The IS200TRPGH1BBA Gas Turbine Primary Trip Board is the H1B version of the TRPG family, which is the current production version for TMR applications. The board family includes the H1A and H1B versions for TMR applications, each with three voting relays per trip solenoid, and the H2A and H2B versions for simplex applications, each with one relay per trip solenoid. The H1A and H2A versions are not used for new applications, while the H1B and H2B versions provide 24 V DC output contact capability in addition to the 125 V DC output contact capability. The H3B version is a special version for TMR applications that features special handling of the 28 V control power and is otherwise identical to the H1B version.
This product introduction provides detailed technical information, functional descriptions, connector assignments, configuration guidance, and comprehensive specifications for the GE IS200TRPGH1BBA Gas Turbine Primary Trip Board, serving as an essential reference for control system engineers, maintenance technicians, and system integrators working with GE industrial control equipment.
Functional Architecture and Signal Processing
The IS200TRPGH1BBA Gas Turbine Primary Trip Board is built around a robust triple modular redundant (TMR) architecture that provides the primary trip function for the gas turbine. The board performs several distinct functions that together ensure reliable and safe turbine protection, including trip solenoid control, flame detection, and diagnostic monitoring.
The I/O pack or board provides the primary trip function by controlling the relays on the TRPG, which trip the main protection solenoids. In TMR applications, the three inputs are voted in hardware using a relay ladder logic two-out-of-three voting circuit, ensuring that a trip command from any two of the three controllers will result in the trip solenoids being energized. The I/O pack or board monitors the current flow in its relay driver control line to determine its energize or de-energize vote and status of the relay coil contact status, and supply voltages are monitored for diagnostic purposes. A normally closed contact from each relay on the TRPG is monitored by the diagnostics to determine its proper operation.
The primary overspeed trip comes from the controller and is passed to the I/O pack or board, and then to the TRPG. The TRPG works in conjunction with the TREG board, which is controlled by the emergency overspeed system, and this TRPG and TREG combination can drive three trip solenoids. The trip solenoid circuits include a metal oxide varistor and a current limiting resistor in each circuit, and the TREG board provides terminals for an optional 10 ohm, 70 W economizing resistor.
The board also accommodates inputs from eight Geiger-Mueller flame detectors. With no flame present, the detector charges up to the supply voltage, and the presence of flame causes the detector to charge to a level and then discharge through the TRPG. As the flame intensity increases, the discharge frequency increases, and when the detector discharges, the I/O pack or board and the TRPG convert the discharged energy into a voltage pulse. The pulse rate varies from 0 to 1,000 pulses per second, and these voltage pulses are fanned out to all three modules. Voltage pulses above 2.5 volts generate a logic high, and the pulse rate over a 40 ms time period is measured in a counter, providing a reliable flame detection function for the gas turbine.
System Design and Compatibility
The IS200TRPGH1BBA Gas Turbine Primary Trip Board is designed for both Mark VI and Mark VIe control systems, providing flexibility across different GE control architectures.
In the Mark VI system, the TRPG works with the VTUR board and supports simplex and TMR applications, with cables with molded plugs connecting the TRPG to the VME rack where the VTUR board is located. In the Mark VIe system, the TRPG is controlled by the PTUR packs on the TURH1C, and supports simplex and TMR applications, with the I/O packs plugging into the D-type connectors on the TURH1C, which is cabled to the TRPG. The IS200TRPGH1BBA Gas Turbine Primary Trip Board is the TMR version for Mark VIe applications, providing three voting relays per trip solenoid and supporting the 125 V DC output contact rating with 1 A capability and the 24 V DC output contact rating with 3 A capability.
Installation and Wiring
The IS200TRPGH1BBA Gas Turbine Primary Trip Board is designed for straightforward installation and field wiring. The wires for the three trip solenoids connect directly to the first I/O terminal block, while the wires for the flame detectors, if used, connect to the second terminal block. The power for the flame detectors is connected to the J3, J4, and J5 plugs, which provide 335 V DC from the rack power supplies in the R, S, and T sections. The 125 V DC power for the trip solenoids is connected to the J1 plug, and power is transferred to the TREG board using the J2 plug.
The terminal blocks can be unplugged from the terminal board for maintenance, and up to two #12 AWG wires per point with 300 V insulation can be accommodated, providing flexibility for different field wiring requirements. The shield bar provides a termination point for the cable shields, ensuring proper shielding and grounding of the field wiring. The board includes the DC-37 pin type connectors with latching fasteners for the cables to the TURH1C in Mark VIe systems or to the VTUR boards in Mark VI systems.
Flame Detector Interface
The IS200TRPGH1BBA Gas Turbine Primary Trip Board includes a comprehensive flame detector interface that supports up to eight Geiger-Mueller flame detectors per board. Each detector is supplied with 335 V DC at 0.5 mA, and the detector signal is processed by the board to generate a pulse rate proportional to the flame intensity. The eight flame detector circuits are arranged with the flame 1 through flame 8 high and low connections on the second terminal block, and the flame detector supply voltage is provided through the J3, J4, and J5 plugs, which receive 335 V DC from the rack power supplies in the R, S, and T sections.
The flame detector excitation voltage is monitored by the diagnostics, and a diagnostic alarm is created if the excitation voltage is too low or too high. This ensures that a failure in the flame detector supply or wiring is detected and reported, maintaining the reliability of the flame detection function.
Diagnostics and Fault Detection
The IS200TRPGH1BBA Gas Turbine Primary Trip Board provides comprehensive diagnostic capabilities that assist with system verification and fault isolation. The I/O board runs the TRPG diagnostics, which include feedback from the trip solenoid relay driver and contact, the solenoid power bus, and the flame detector excitation voltage being too low or too high. A diagnostic alarm is created if any one of the signals goes unhealthy or beyond limits, alerting the operator to a potential problem with the trip or flame detection circuits.
The connectors JR1, JS1, and JT1 on the terminal board have their own ID device, which is interrogated by the I/O board. The ID device is a read-only chip coded with the terminal board serial number, board type, revision number, and the plug location. If a mismatch is encountered, a hardware incompatibility fault is created, preventing the system from operating with incorrect or mismatched hardware. This diagnostic feature ensures that the correct board is installed in each location and that the system configuration matches the physical hardware.
Configuration
The IS200TRPGH1BBA Gas Turbine Primary Trip Board has no jumpers or hardware settings on the board. All configuration is performed through the system software and the I/O pack or board, simplifying installation and reducing the potential for configuration errors. The board's operating mode, whether TMR or simplex, is determined by the board version and the system configuration, and the board's output contact rating is determined by the board version and the field wiring.
Application Suitability and System Integration
The IS200TRPGH1BBA Gas Turbine Primary Trip Board is a critical component of the gas turbine protection system, providing the primary trip function that protects the turbine from overspeed conditions and other hazardous events. The board's TMR architecture, with nine magnetic relays in three voting circuits, provides the fault tolerance and high availability required for a safety-critical protection function.
The board's trip solenoid interface, with three trip solenoids per TRPG and hardware two-out-of-three voting, ensures that a trip command from any two of the three controllers will result in the trip solenoids being energized, providing reliable tripping even if one controller or one relay fails. The board's flame detector interface, with eight Geiger-Mueller flame detectors and a pulse rate measurement from 0 to 1,000 pulses per second, provides reliable flame detection for the gas turbine combustion monitoring function.
In Mark VI systems, the TRPG works with the VTUR board, with cables with molded plugs connecting the TRPG to the VME rack where the VTUR board is located. In Mark VIe systems, the TRPG is controlled by the PTUR packs on the TURH1C, with the I/O packs plugging into the D-type connectors on the TURH1C. The IS200TRPGH1BBA Gas Turbine Primary Trip Board is the TMR version for Mark VIe applications, providing the three voting relays per trip solenoid and the 125 V DC and 24 V DC output contact capabilities required for the primary trip function.
Maintenance and Lifecycle
The IS200TRPGH1BBA Gas Turbine Primary Trip Board is designed for long service life with minimal maintenance. The board contains the magnetic relays as its only moving parts, and its robust construction ensures high reliability in continuous industrial operation. Routine maintenance consists of periodic visual inspection of the board, terminal blocks, and wiring, verification that the trip solenoid power and flame detector excitation voltages are within specification, and confirmation that the shield terminals are properly connected.
The board's diagnostic features, including the trip solenoid relay driver feedback, the solenoid power bus monitoring, the flame detector excitation voltage monitoring, and the onboard ID chip, simplify troubleshooting and ensure that the correct board is installed in each location. If a trip solenoid relay driver or contact fails, a diagnostic alarm is created, alerting the operator to a potential problem with the trip circuit. If the flame detector excitation voltage goes too low or too high, a diagnostic alarm is created, alerting the operator to a potential problem with the flame detection circuit.
If the board requires replacement, the process is straightforward. After de-energizing the associated equipment and verifying that no power exists, the pluggable terminal blocks should be labeled and removed, and the board should be removed from its mounting. The replacement board should be installed in the same position, and the terminal blocks reconnected as labeled before returning the system to service.
GE Industrial Control Systems ensures compatibility of its replacement boards, even though boards of different revision levels may not contain identical hardware. When ordering a replacement IS200TRPGH1BBA Gas Turbine Primary Trip Board, provide the complete part number and description, the drive or system serial number, and the Material List (ML) number. The factory may substitute later versions based on availability and design enhancements, but backward compatibility of replacement boards is guaranteed.
Conclusion
The GE IS200TRPGH1BBA Gas Turbine Primary Trip Board is a reliable, robust, and safety-critical protection module for GE Industrial Control Systems gas turbine applications. Its nine magnetic relays in three voting circuits, its three trip solenoid interfaces with hardware two-out-of-three voting, its eight Geiger-Mueller flame detector inputs, its 125 V DC and 24 V DC output contact capabilities, and its comprehensive diagnostics provide the primary trip and flame detection functionality required for the gas turbine protection function.
With its pluggable terminal blocks, clearly labeled connectors, comprehensive diagnostics, and compatibility with both Mark VI and Mark VIe architectures, the IS200TRPGH1BBA Gas Turbine Primary Trip Board is designed for easy installation, verification, and maintenance. Backed by GE's quality manufacturing, global support network, and commitment to backward compatibility, the IS200TRPGH1BBA Gas Turbine Primary Trip Board continues to deliver the performance, durability, and safety that industrial users expect from GE. Whether used in a new installation or as a replacement for an existing board, the IS200TRPGH1BBA Gas Turbine Primary Trip Board provides the primary trip and flame detection functionality required for reliable and safe gas turbine operation.
