SPECIFICATIONS
Part No.: IS200TREGH1BEC
Manufacturer: General Electric
Country of Manufacture: United States of America (USA)
Size: 17.8 cm wide x 33.02 cm high
Temperature: -30 to + 65oC
Technology: Surface-mount
Number of relay channels 12 relays
Product Type: Emergency Trip Terminal Board
Availability: In Stock
Series: Mark VIe
Functional Description
IS200TREGH1BEC is an emergency Trip Terminal Board developed by GE. It is a part of Mark VIe control system. The gas turbine emergency trip terminal board serves 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. This terminal board is pivotal in ensuring 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 crucial link between the TREG and TRPG terminal boards.
- Power Supply: TREG specifically 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 assumes the responsibility of providing emergency overspeed protection, ensuring swift and responsive actions in the event of a turbine overspeed condition, and mitigating potential hazards.
- Emergency Stop Functions: Alongside overspeed protection, the I/O controller governs emergency stop functions, allowing for prompt cessation of turbine operations during critical scenarios or emergency situations, prioritizing safety.
- Relays and Trip Solenoid Control: Relay Control: Bboasts 12 relays, and among them, nine are organized into three groups of three. These grouped relays collectively form a voting system, controlling the inputs for the three trip solenoids.
- Trip Solenoid Management: Through the coordination of these relays, the I/O controller manages and votes on inputs, ultimately controlling the three trip solenoids. This sophisticated control mechanism ensures reliable and accurate activation of emergency trip functions based on the controller's decisions.
- The TREG terminal board's role in supplying power, managing relays, and enabling emergency trip functionalities, orchestrated by the I/O controller, plays a pivotal role in maintaining safety and ensuring controlled emergency responses within gas turbine systems.
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.
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 IS200TREGH1BEC?
It is an emergency trip terminal board developed by GE under the Mark VIe series.
What is the role of the 28 V DC bus in the emergency trip mechanism?
The 28 V DC bus is current limited and serves as the power source for an external manual emergency trip contact (E-STOP). This setup ensures a controlled power supply for manual emergency trip functions.
How are master trip relays (K4X, K4Y, K4Z) involved in emergency trip occurrences?
During a manual emergency trip, the three master trip relays disconnect the 28 V DC bus from the ETR and KE relay coils. This action safeguards the system by isolating the affected components in the event of an emergency trip occurrence.
How is the trip information transmitted and identified in case of a trip initiation?
Any trip originating from the protection module or TREG prompts each of the three protection module sections to transmit a trip command via the IONet to the control module. This transmission allows for clear identification of the trip source, aiding in diagnosing and addressing issues efficiently.
