IS210TREGH3B - Turbine Emergency Trip Terminal Board

SPECIFICATIONS:

Part Number: IS210TREGH3B
Manufacturer: General Electric
Series: Mark VIe
Product Type: Turbine Emergency Trip Terminal Board
Technology: Surface Mount
Size: 17.8 cm wide x 33.02 cm
Common Mode Voltage Range: ±5 V
Operating temperature: 0 to 65 °C
No.of Analog Voltage Inputs: 6
Repair: 3-7 Days
Weight: 2.00 lbs
Number of trip solenoids: 3
Number of inputs: 6
Availability: In Stock
Country of Origin: United States
Manual: GEH-6421I

FUNCTIONAL DESCRIPTION:

IS210TREGH3B is a Turbine Emergency Trip Terminal Board manufactured and designed by General Electric as part of the VIe Series used in GE Distributed Turbine Control Systems. The TREG module is responsible for supplying power to up to three emergency trip solenoids and operates under the control of the I/O controller. These solenoids are critical components in turbine or generator safety systems, providing a fast-acting mechanism to stop the system during abnormal or emergency conditions, such as overspeed events or other hazardous operating situations.

A maximum of three trip solenoids can be connected between the TREG and TRPG terminal boards. In this configuration, TREG supplies the positive side of the DC power to the solenoids, while TRPG provides the negative side, completing the circuit. The I/O controller plays a pivotal role by delivering emergency overspeed protection, emergency stop functions, and controlling the 12 relays located on the TREG board. Out of these 12 relays, nine are organized into three groups of three relays each, and these groups are responsible for "voting" inputs that determine activation of the three connected trip solenoids. This voting mechanism ensures that the trip solenoids are triggered reliably only when specific safety conditions are met. The TREG board comes in multiple types, each tailored for specific applications and system configurations:

• HIA Version: This is an older version and is no longer used in new production. It has been replaced by more advanced versions.
• H1B Version: This is the primary version for 125V DC applications. Control power is drawn from the JX1, JY1, and JZ1 connectors, which are diode-combined to create redundant power sources. This redundancy ensures that the board remains operational even if one power source fails. The redundant power supports status feedback circuits and economizing relays, while power separation is strictly maintained for the trip relay circuits to ensure that critical safety functions are isolated from auxiliary power paths.
• H2B Version: Designed for 24V DC applications, this board provides the same functionality and features as the H1B, including the redundant feedback and economizing relay power configuration.
• H3B, H4B, H5B Versions: These are specialized versions of H1B intended for systems with redundant TREG boards.

INSTALLATION:

The first I/O terminal block serves as the primary connection point for critical safety and control components in the system. Specifically, the three trip solenoids, which are responsible for rapidly stopping the turbine or generator during emergency conditions, are wired directly to this block. In addition to the trip solenoids, economizing resistors and the emergency stop circuit are also connected here.

• Economizing resistors play a key role in controlling the current supplied to certain relays, helping to reduce power consumption and prevent overheating during normal and standby operations.

• The emergency stop circuit provides a direct and immediate means to shut down the system safely, bypassing standard operational logic if a critical hazard is detected.

• The second I/O terminal block is designated for additional protective interlocks, allowing for up to seven trip interlocks to be wired. These interlocks act as supplementary safety checks that must be satisfied before a trip solenoid can activate. They monitor various system conditions such as turbine speed, pressure, temperature, or other critical operational parameters—and ensure that the trip action is executed only when multiple safety conditions are met.

• This dual-terminal-block configuration provides a clear separation between primary safety functions (trip solenoids, emergency stop, and economizing resistors) and auxiliary interlocks, enhancing both the reliability and maintainability of the system. By organizing the connections in this manner, maintenance personnel can easily identify, troubleshoot, and service critical components without risking disruption to other parts of the control system.

OPERATION:

The TREG board operates under complete control of the I/O controller, which manages all of its functions and ensures that safety-critical operations are executed reliably. The TREG itself does not contain autonomous control logic; instead, it acts as an interface for powering and controlling emergency trip solenoids, relays, and feedback circuits, responding solely to commands from the I/O controller. The physical connections between the TREG and the control modules are minimal, reflecting its role as a controlled power interface:

• J2 Power Cable: This cable supplies the necessary control and operating power to the TREG board from the system’s main control modules.
• Trip Solenoid Connections: The solenoids, which execute the emergency turbine stop, are wired directly to TREG and are activated only via signals from the I/O controller.

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FREQUENTLY ASKED QUESTIONS:

What is the function of the TREG/TRPG terminal boards?

The TREG/TRPG terminal boards supply power to the emergency trip solenoids and serve as the interface between the solenoids and the I/O controller. TREG provides the positive DC supply, while TRPG provides the negative connection. Together, they ensure that the trip solenoids receive reliable power for emergency turbine shutdowns.

How many trip solenoids can be connected to the TREG/TRPG?

Up to three trip solenoids can be connected, with their activation controlled by a voting relay logic on the TREG board. Each solenoid is linked to a dedicated group of relays that determine when it should activate based on safety inputs from the I/O controller.

How is redundant power implemented on the H1B board?

Control power from connectors JX1, JY1, and JZ1 is diode-combined, providing redundant power paths to the status feedback circuits and economizing relays. This ensures that a single power failure does not compromise board operation.

How is the relay voting logic implemented?

Each trip solenoid is controlled by a 3-of-3 relay voting scheme. The I/O controller provides discrete inputs to each relay group, and the solenoid is energized only when all three relays within a group simultaneously close. This ensures fail-safe operation and prevents spurious trips.