IS210TREGH1B - Turbine Emergency Trip Terminal Board

SPECIFICATIONS

Part No.: IS210TREGH1B
Manufacturer: General Electric
Country of Manufacture: United States of America (USA)
Size: 33.0 cm high x 17.8 cm, wide
Technology: Surface mount
Temperature: -30 to 65oC
MPU pulse rate range: 2 Hz to 20 kHz
MPU pulse rate accuracy: 0.05 percent of reading
Number of inputs: 14
Number of outputs: 9
Contact ratings: NEMA class F.
Product Type: Turbine Emergency Trip Terminal Board
Availability: In Stock
Series: Mark VIe

Functional Description

IS210TREGH1B is a Turbine Emergency Trip Terminal Board developed by GE. It is a part of the Mark VIe control system. TREG supplies power to three emergency trip solenoids and is managed by the I/O controller. A maximum of three trip solenoids can be connected between the TREG and TRPG terminal boards. It delivers the positive side of the DC power to the solenoids, while TRPG provides the negative side.

Power Supply and System Connectivity

Distributes DC power and maintaining control integrity across the emergency trip circuit. It ensures that the turbine can be safely and rapidly shut down when protection limits are exceeded.

The typical configuration includes:

• TREG Terminal Board – Supplies the positive side of the DC voltage to the solenoids.
• TRPG Terminal Board – Supplies the negative side of the DC voltage, completing the trip circuit.

Each of the three trip solenoids receives its power through dedicated relay channels, ensuring that any trip command issued by the Mark VIe controller is transmitted accurately and without delay. The design minimizes the risk of false trips while maintaining a fail-safe response in the event of a confirmed fault.

Relay Configuration and Redundancy

The TREG board incorporates a total of 12 relays, carefully structured to provide both control precision and redundancy. Out of these 12 relays, nine are organized into three groups of three, forming a three-channel voting logic system.

This configuration plays a crucial role in Triple Modular Redundancy (TMR) systems used in high-integrity turbine control environments. The three-channel voting arrangement ensures that:

• A trip signal is executed only when at least two out of three relays in a group confirm the trip condition.
• False trips caused by noise or single-point relay failure are prevented.
• System reliability and safety are enhanced by maintaining operational redundancy.

The remaining three relays on the board perform auxiliary or monitoring functions, supporting trip verification and system diagnostics. This redundancy-based relay design ensures precise trip logic, which is essential for maintaining safe turbine operation and compliance with protection standards.

Functional Role in Turbine Protection

It serves as a central component in the emergency overspeed protection and emergency stop circuits of the turbine system. During critical fault conditions, the Mark VIe controller sends a trip signal to the TREG board, which in turn energizes or de-energizes the associated solenoids to isolate fuel supply and shut down the turbine safely.

Typical protective actions initiated through TREG include:

• Overspeed Trip – Activated when turbine speed exceeds safe limits.
• Manual Emergency Stop – Triggered by operators during hazardous situations.
• System Fault Trip – Initiated automatically upon detection of unsafe operating parameters.

These functions ensure that the turbine system can transition to a safe shutdown state rapidly, preventing potential mechanical damage or safety risks.

Design Benefits and Reliability

The TREG board’s design emphasizes reliability, modularity, and fault tolerance, making it ideal for critical applications in gas, steam, and hydro turbine systems. Its robust construction ensures long-term performance even in demanding industrial environments characterized by high vibration, temperature variations, and electrical noise.

Key benefits include:

• High-speed response to emergency trip commands.
• Redundant relay architecture for enhanced system reliability.
• Seamless integration with other Mark VIe components via standardized connectors and control logic.
• Simplified maintenance and testing, with clear diagnostic pathways and modular replacement capability.

Operation

The board operates under the direct control of the I/O controller, making it a highly integrated and responsive component. Key connections include:

• J2 Power Cable: Supplies the necessary power for board operations.
• Trip Solenoids: Provide the connection for emergency trip execution.
• J1 Trip Signal Cable: In simplex systems, this additional connection links to the TSVO terminal board, enabling a servo valve clamp function during turbine trips.
• By minimizing external dependencies and leveraging the I/O controller’s capabilities, the TREG board ensures fast and reliable responses during critical scenarios.

Terminal Board Diagnostics

To ensure high reliability, operational safety, and system integrity, the I/O controller performs continuous and comprehensive diagnostics on the board and its connected components. These diagnostics play a crucial role in monitoring critical parameters, detecting anomalies, and preventing failures that could compromise turbine operations.

Key Diagnostic Functions

The diagnostic system monitors several essential aspects of the TREG board, including:

• Trip Relay Driver and Contact Feedback: Ensures that the trip relay functions correctly by continuously verifying its driver signals and feedback contacts. Confirms that the relay engages and disengages properly, preventing unintended turbine trips or failure to shut down during an emergency.
• Solenoid Voltage Levels: Monitors the voltage supply to the trip solenoids to ensure they receive stable and adequate power for proper operation. Detects overvoltage, undervoltage, or loss of voltage, which could lead to trip solenoid failure.
• Economizer Relay Driver and Feedback Mechanisms: Verifies the performance of the economizer relay, which optimizes solenoid power consumption by reducing energy draw after activation. Ensures proper feedback communication between the relay driver and the I/O controller.
• K25A Relay Driver and Coil Performance: Continuously checks the K25A relay driver to ensure it is operating correctly. Monitors the coil resistance and activation response, detecting faults such as open circuits, short circuits, or degradation over time.
• Servo Clamp Relay Driver and Feedback Systems: Ensures the servo clamp relay driver is functioning correctly, as this component plays a role in system control and stability. Feedback mechanisms verify that the relay engages and releases properly, preventing erratic turbine behavior.
• Solenoid Voltage Source: Verifies the primary power source supplying the solenoids. Detects power fluctuations, drops, or loss of supply, which could prevent the system from initiating an emergency trip when needed.

Fault Notification and System Response

If any discrepancies, malfunctions, or abnormalities are detected during the diagnostic process, the system:

• Generates an immediate fault notification, alerting operators to potential issues.
• Logs diagnostic data for further analysis and troubleshooting.
• Initiates predefined safety protocols, ensuring minimal risk to the turbine and power system

Solenoid Trip Tests 

• The application software within the controller is utilized to initiate and perform tests on the trip solenoids. These tests can be conducted online, allowing each trip solenoid to be manually activated individually. This can be done either through the PTR relays controlled by the system or through the ETR relays from the protection module.
• To verify that a solenoid has successfully tripped, a contact from each solenoid circuit is wired back as a contact input, providing a positive confirmation.
• Additionally, primary and emergency offline overspeed tests are available, enabling the verification of actual trips under conditions where the software simulates trip overspeed scenarios.

The WOC team is always available to help you with your Mark VIe requirements. For more information, please contact WOC.

Frequently Asked Questions

What is IS210TREGH1B?
It is a Turbine Emergency Trip Terminal Board developed by GE under the Mark VIe series.

What is the role of the Turbine Emergency Trip Terminal Board in turbine protection?
It provides power to up to three emergency trip solenoids and is fully controlled by the I/O controller. It plays a crucial role in providing emergency overspeed protection and emergency stop functions. The system utilizes 12 relays on the TREG, nine of which are grouped in three sets of three-to-vote inputs, controlling the solenoids that are crucial for turbine safety.

What is the connection between TREG and TRPG boards?
TREG supplies the positive side of the DC power to the emergency trip solenoids, while the TRPG board provides the negative side of the power to complete the circuit. The I/O controller manages the communication and activation of trip functions between TREG and TRPG boards.

How does the TREG system work in simplex and redundant configurations?
In simplex systems, works with a third cable from J1 to the TSVO terminal board provides a servo valve clamp function when the turbine trips. The system can be configured with redundancy for enhanced reliability and fault tolerance.

What happens if there is a mismatch or fault in the system?
If the I/O controller detects a mismatch during diagnostics or identifies an incompatibility between the TREG board and other components (via the ID device), a hardware fault is triggered. This helps to ensure that only compatible and properly functioning hardware is used in the system, maintaining turbine safety.

How are the trip solenoids tested?
Trip solenoids can be tested using the application software in the controller, which allows the user to manually trigger each trip solenoid individually. Tests can be initiated through the PTR or ETR relays, confirming the solenoid circuit contacts, ensuring proper functionality of the emergency trip mechanisms.