IS200TREGS3B - Trip Emergency Gas Board

IS200TREGS3B - Trip Emergency Gas Board IS200TREGS3B - Trip Emergency Gas Board

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Part No.: IS200TREGS3B
Manufacturer: General Electric
Series: Mark VIe
Technology: Surface mount
Number of trip solenoids: Three
Availability: In Stock
Size 17.8 cm wide x 33.02 cm, high
Country of Manufacture: United States (USA)

Functional Description

IS200TREGS3B is an Turbine Trip Emergency Gas Board developed by GE. It is a part of Mark VIe control system. To ensure system reliability and redundancy, redundant TREG applications often utilize one H3B (High-Pressure Turbine Trip Solenoid Board) and one H4B (High-Pressure Compressor Trip Solenoid Board) used together. Each board type has specific functions and characteristics designed to maintain control power separation in these systems. Therefore, it is crucial to use the correct board type during system repairs to preserve the intended safety and control features.


  • 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 serve to reduce the current load after the solenoids are energized, optimizing their performance.
  • Emergency trip relays (ETR1, 2, 3) are connected to the positive 125 V DC feeder for each solenoid, while primary trip relays (PTR1, 2, 3 in TRPG) are connected to the negative 125 V DC feeder for each solenoid.
  • Furthermore, each I/O controller in the R8, S8, and T8 sections supplies an independent 28 V DC source. The 28 V DC bus is current-limited and used for power to an external manual emergency trip contact (E-STOP). By conducting these tests using the application software, the gas turbine system's reliability and safety are extensively evaluated. Regular testing of trip solenoids and their feedback contacts contribute to the early detection of any anomalies or malfunctions, enhancing the overall safety and efficiency of the system.

Control of Trip Solenoids

  • Both TRPG and TREG have the capability to control the trip solenoids, enabling either one to interrupt power and activate the hydraulic system to close the steam or fuel valves. TREG has a total of nine trip relay coils, which receive a 28 V dc supply from the I/O controller. The trip solenoids, on the other hand, are powered with 125 V dc through plug J2 and have a current draw of up to 1 A, with a time constant of 0.1 seconds (L/R time constant).
  • It's worth noting that the solenoid circuit includes a metal oxide varistor (MOV) for current suppression and a 10 Ω, 70 W economizing resistor. These solenoids are supplied by a separately fused 125 V dc feeder from the turbine control system. They become energized during the run mode and de-energize in the trip mode. Diagnostics closely monitor each 125 V dc feeder from its entry point on the terminal board to ensure the integrity of the fuse and cable connections.
  • For each solenoid, two series contacts from each emergency trip relay (ETR1, 2, 3) are connected to the positive 125 V dc feeder, while two series contacts from each primary trip relay (PTR1,2,3 in TRPG) are connected to the negative 125 V dc feeder. Additionally, there is an economizing relay (KE1, 2, 3) for each solenoid, featuring a normally closed contact that operates in parallel with the current limiting resistor. These economizing relays are used to reduce the current load after the solenoids are initially energized. The ETR and KE relay coils are powered from a 28 V dc source originating from the I/O controller. Each section (R8, S8, and T8) has its own independent 28 V dc source.
  • The 28 V dc bus is current-limited and serves as the power source for an external manual emergency trip contact, labeled as E-STOP. Three master trip relays (K4X, K4Y, K4Z) are responsible for disconnecting the 28 V dc bus from both the ETR and KE relay coils in the event of a manual emergency trip.
  • Any trip event, whether it originates in the protection module (e.g., EOS) or from TREG (e.g., manual trip), triggers all three sections of the protection module to send a trip command over the IONet to the control module. This functionality can be used to identify the source of the trip. Additionally, the K4CL servo clamp relay activates and sends contact feedback directly from the TREG terminal board to the TSVO servo terminal board. TSVO then disconnects the servo current source from the terminal block and applies a bias to close the control valve. This mechanism is primarily employed in simplex applications to safeguard against the servo amplifier failing in the high position.


  • Wiring Configuration: The installation involves connecting various components to terminal blocks on the system. Specifically, three trip solenoids, economizing resistors, and the emergency stop feature are directly wired to the first I/O terminal block. This arrangement ensures a streamlined connection of critical components to the system.
  • Additional Interlocks: For added functionality and safety, the system allows for the connection of up to seven trip interlocks, which can be conveniently wired to the second terminal block. This flexibility allows for the integration of multiple interlocking mechanisms to enhance system reliability and protection.
  • Maintenance Accessibility: An important feature of the installation is the ease of maintenance. Terminal blocks are designed to be easily unplugged from the terminal board when maintenance or troubleshooting is required. This accessibility simplifies maintenance tasks, making it efficient to service or replace components connected to the terminal blocks as needed.
  • Connection to TSVO Boards: Additionally, the J1 connection provides a link to the TSVO boards on SMX systems. This connection is essential for ensuring the seamless communication and coordination between different subsystems within the larger system.
  • Wire Specifications: It's important to note that the installation allows for the use of up to two #12 AWG wires per connection point, and these wires must have insulation rated for up to 300 volts. This specification ensures that the wiring meets safety and performance standards, providing a reliable electrical connection within the system.

Trip Interlock Isolation

  • The trip interlock system incorporates robust optical isolation, ensuring reliable operation and safety within the control environment.
  • All inputs are optically isolated up to 1500 volts, effectively shielding against potential electrical disturbances and enhancing system resilience against voltage fluctuations or transients.

Solenoid Inductance

  • The solenoid units employed in the system exhibit a maximum inductance-to-resistance (L/R) time constant of 0.1 second.
  • This characteristic defines the rate at which the solenoid's inductance influences the current flow, providing insight into the solenoid's responsiveness and dynamic behavior within the control circuitry.
  • A low L/R time constant ensures swift and efficient operation of the solenoids, contributing to rapid response times and precise control actions in critical scenarios.

World of Controls has the most comprehensive collection of GE Mark VIe components. Please contact WOC as soon as possible if you require any extra information.

Frequently Asked Questions


What is IS200TREGS3B?
It is an Turbine Trip Emergency Gas Board developed by GE

Why are diagnostics and ID devices crucial in gas turbine systems?
Diagnostics and ID devices play a vital role in ensuring the reliability and safety of gas turbine systems. By continuously monitoring and validating critical components' performance, the system can promptly detect and address any deviations or faults, contributing to optimal operation and enhanced system integrity.

Are there any configuration options available on the terminal board?
No, the terminal board does not have any switches for configuration. Instead, it uses jumpers to enable specific functionalities.

What is the purpose of the jumper on the terminal board?
The jumper is used to configure the terminal board according to the system requirements. It allows users to enable or disable certain features or inputs as needed.