IS200TREGH1BEC GE MarkVIe, Emergency Trip Terminal Board

Description:

 Functional Description
The IS200TREGH1BEC is an emergency trip terminal board developed by GE, specifically designed as part of the Mark VIe control system. This terminal board plays a crucial role in delivering power to three distinct emergency trip solenoids, all under the control of the I/O controller within the gas turbine system. It ensures the implementation of emergency safety measures and operational control.

 Power Distribution for Emergency Trip Solenoids
- Trip Solenoid Connection: The TREG terminal board facilitates the connection of up to three trip solenoids, forming a vital link between the TREG and TRPG terminal boards.
- Power Supply: TREG provides the positive side of the DC power required for the solenoids, while the TRPG terminal board complements this by supplying the negative side. This collaborative power distribution setup ensures comprehensive and controlled power delivery to the solenoids, which is critical for emergency operations.

 Functions and Control by I/O Controller
  - Controller-Based Functions:
  - Overspeed Protection: The I/O controller is responsible for providing emergency overspeed protection, ensuring swift and responsive actions in the event of a turbine overspeed condition, thus mitigating potential hazards.
  - Emergency Stop Functions**: The I/O controller also governs emergency stop functions, allowing for the prompt cessation of turbine operations during critical scenarios or emergency situations, prioritizing safety.
  - Relay and Trip Solenoid Control: The I/O controller manages 12 relays, with nine organized into three groups of three. These grouped relays collectively form a voting system, controlling the inputs for the three trip solenoids. Through the coordination of these relays, the I/O controller ultimately controls the three trip solenoids, ensuring reliable and accurate activation based on the controller's decisions.

 Control Mechanism for Trip Solenoids
The control and operation of the trip solenoids involve a coordinated effort between the TRPG and TREG, ensuring redundancy and enabling either terminal board to deactivate power and trigger the hydraulics to close steam or fuel valves, a critical safety measure.

 Power Supply and Solenoid Specifications
- Relay Coils on TREG: TREG houses nine trip relay coils, each receiving a 28 V DC supply from the I/O controller. These relays play a crucial role in managing and controlling the trip solenoids.
- Solenoid Power Supply: The trip solenoids, located on plug J2, are powered by a 125 V DC supply, drawing up to 1 A with a 0.1-second L/R time constant. This power circuit incorporates a metal oxide varistor (MOV) for current suppression and a 10 Ω, 70 W economizing resistor, enhancing safety and regulating current flow.

 Feeder Supply and Diagnostics
- Separately Fused Feeder: A distinct 125 V DC feeder, provided from the turbine control, supplies power to the solenoids. These solenoids energize during the run mode and de-energize during the trip mode, contributing to safe and controlled turbine operations.
- Diagnostic Monitoring: Diagnostics actively monitor each 125 V DC feeder from the power distribution module at its entry point on the terminal board. This monitoring system ensures integrity by verifying fuse conditions and cable connections, enhancing system reliability and safety.

 Relay Contacts and Economizing Relays
- Relay Contacts: Series contacts from emergency trip relays (ETR1, 2, 3) and primary trip relays (PTR1, 2, 3 in TRPG) are connected to the positive and negative 125 V DC feeders respectively for each solenoid. These contacts serve as crucial elements in managing solenoid power supply.
- Economizing Relays: Economizing relays (KE1, 2, 3) are associated with each solenoid, featuring normally closed contacts parallel to the current limiting resistor. These relays reduce the current load post-solenoid energization, ensuring efficient and optimized operation.

 I/O Controller Power Supply
- Power Source: The I/O controller supplies power for ETR and KE relay coils from a 28 V DC source. Each I/O controller within the R8, S8, and T8 sections delivers an independent 28 V DC source, enhancing redundancy and reliability in the control mechanism for trip solenoids.

This elaborate control setup, involving power supplies, diagnostic monitoring, relay contacts, and economizing relays, ensures the efficient and controlled operation of trip solenoids, crucial for maintaining safety and control within gas turbine systems.

Datasheet Link:

IS200TREGH1BEC GE MarkVIe, Emergency Trip Terminal Board PDF Datasheet