IS210TREGH1B - Turbine Emergency Trip DIN Rail Module

SPECIFICATIONS:

Part Number: IS210TREGH1B
Manufacturer: General Electric
Series: Mark VIe
Product Type: Turbine Emergency Trip DIN Rail Module
Number of Channels: 24
Number of inputs: 12
Number of trip solenoids: 3
Number of outputs: 125 V dc
Technology: Surface Mount
Suppression: MOV across the solenoid
Trip interlock isolation: Optical isolation to 1500 V
Dimensions: 17.8 cm wide x 33.02 cm
Operating Temperature: 30 to 65°C
Repair: 3-7 Days
Availability: In Stock
Country of Origin: United States
Manual: GEH-6421I

FUNCTIONAL DESCRIPTION:

IS210TREGH1B is a Turbine Emergency Trip DIN Rail Module manufactured and designed by General Electric as part of the Mark VIe Series used in GE Distributed Turbine Control Systems. The TREG terminal board is responsible for supplying DC power to up to three emergency trip solenoids. It works in coordination with the I/O controller and the TRPG terminal board to ensure a safe and reliable turbine shutdown during emergency conditions. TREG delivers the positive DC voltage to the solenoids, while TRPG completes the circuit by providing the negative return path.

The I/O controller plays a critical role by managing emergency functions such as overspeed protection and emergency stop. It also controls 12 relays located on the TREG board. Out of these, nine relays are arranged into three voting groups—each consisting of three relays—to manage the activation of the three trip solenoids through a 2-out-of-3 voting logic. This voting mechanism enhances system reliability and ensures fail-safe operation during critical events. There are several board types, as follows:

• H1B is the primary version for 125v dc applications. Control power from the JX1, JY1, and JZ1 connectors are diode combined to create redundant power on the board for status feedback circuits and powering the economizing relays. Power separation is maintained for the trip relay circuits.

• H2B is used for 24v dc applications. All other features are the same as H1B.

• H3B is a special version of H1B for use in systems with redundant TREG boards. Feedback circuit and economizing relay power is provided only by the JX1 connector.

• H4B is a special version of H1B for use in systems with redundant TREG boards. The feedback circuit and economizing relay power are provided only by the JY1 connector.

• H5B is a special version of H1B for use in systems with redundant TREG boards. The feedback circuit and economizing relay power are provided only by the JZ1 connector.

In redundant TREG applications, it is typical to find one H3B and one H4B board used together. System repairs must be done with the correct board type to maintain the control power separation designed into these systems. In Mark VIe systems, TREG is controlled by the PPRO pack on SPRO. The PPRO I/O packs plug into the D-type connectors on SPRO. Cables with molded plugs connect TREG to the SPRO board.

CONTROL OF TRIP SOLENOIDS:

Both TRPG and TREG control the trip solenoids so that either one can remove the power and actuate the hydraulics to close the steam or fuel valves. The nine trip relay coils on TREG are supplied with 28 V dc from the I/O controller. The trip solenoids are supplied with 125 V de through plug J2 and draw up to 1 A with a 0.1-second L/R time constant.

• Note that the solenoid circuit has a metal oxide varistor (MOV) for current suppression and a 10 £2, 70 W economizing resistor.

• A separately fused 125 V dc feeder is provided from the turbine control for the solenoids, which energize in the run mode and de-energize in the trip mode. Diagnostics monitor each 125 V dc feeder from the power distribution module at its point of entry on the terminal board to verify the fuse integrity and the cable connection.

• Two series contacts from each emergency trip relay (ETR1, 2, 3) are connected to the positive 125 V dc feeder for each solenoid, and two series contacts from each primary trip relay (PTR1,2,3 in TRPG) are connected to the negative 125 V dc feeder for each solenoid.

• An economizing relay (KE1, 2, 3) is supplied for each solenoid with a normally closed contact in parallel with the current-limiting resistor. These relays are used to reduce the current load after the solenoids are energized.

• The ETR and KE relay coils are powered from a 28 V de source from the I/O controller. Each PPRO I/O pack in each of the R8, S8, and T8 sections supplies an independent 28 V dc source.

• The 28 V dc bus is currently limited and used for power to an external manual emergency trip contact, shown as E-STOP. Three master trip relays (K4X, K4Y, K4Z) disconnect the 28 V DC bus from the ETR and KE relay coils if a manual emergency trip occurs.

• Any trip that originates in either the protection module (such as EOS) or the TREG (such as a manual trip) will cause each of the three protection module sections to transmit a trip command over the IONet to the control module and may be used to identify the source of the trip.

OPERATION:

TREG is entirely controlled by the I/O controller, and the only connections to the control modules are the J2 power cable and through the trip solenoids. In simplex systems a third cable carries a trip signal from J1 to the TSVO terminal board, providing a servo valve clamp function upon turbine trip. A separately fused 125 V dc feeder is provided from the turbine control for the solenoids, which energize in the run mode and de-energize in the trip mode. Diagnostics monitor each 125 V dc feeder from the power distribution module at its point of entry on the terminal board to verify the fuse integrity and the cable connection.

Two series contacts from each emergency trip relay (ETR1, 2, 3) are connected to the positive 125 V dc feeder for each solenoid, and two series contacts from each primary trip relay (PTR1,2,3 in TRPG) are connected to the negative 125 V dc feeder for each solenoid. An economizing relay (KE1, 2, 3) is supplied for each solenoid with a normally closed contact in parallel with the current-limiting resistor. These relays are used to reduce the current load after the solenoids are energized. The ETR and KE relay coils are powered from a 28 V dc source from the I/O controller. Each PPRO I/O pack in each of the R8, S8, and T8 sections supplies an independent 28 V dc source.

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FREQUENTLY ASKED QUESTIONS:

What is the function of the Turbine Emergency Trip DIN Rail Module in the control system?

The module acts as the interface between the turbine control system and the trip solenoids. It receives emergency trip signals from the I/O controller and facilitates safe, fast turbine shutdown by energizing or de-energizing the trip solenoids.

How is control power managed in the module?

For 125V DC systems, control power is diode-OR’d from JX1, JY1, and JZ1 connectors to create redundant power paths for feedback and economizing circuits, maintaining separation for trip relay circuits.

What relay configuration is used for solenoid control?

The module uses 12 relays, where 9 are grouped into three sets of 2-out-of-3 voting logic. Each group governs one of the three trip solenoids, ensuring high availability and fault tolerance.