SPECIFICATIONS
Part No.: IS200TRELH1A
Manufacturer: General Electric
Country of Manufacture: United States of America (USA)
Temperature Operating: -30 to 65 o C
Size: 17.8 cm wide x 33.02 cm high
Trip interlock filter: Hardware filter, 4 ms
Product Type: Emergency Trip Board
Availability: In Stock
Series: Mark VI
Functional Description
IS200TRELH1A is an emergency trip board developed by GE. It is a part of Mark VI control system. It operates in conjunction with the I/O controller within the protection module to execute specific functions vital for turbine safety. TREL serves as a crucial safety mechanism in large steam turbines, specifically dedicated to emergency overspeed protection through its interaction with the I/O controller and control of trip solenoids. Its specialized design in TMR form, devoid of certain features present in other relays like TREG, underscores its focus on emergency functionalities and safety protocols. Additionally, its expandability with multiple boards further emphasizes the importance of redundancy in critical turbine safety systems.
Control Mechanism
- TREL is under the command of the I/O controller, responsible for administering power to three essential emergency trip solenoids. These solenoids are connectable between the
- TREL and TRPL terminal boards. TREL supplies the positive side of the 125 V dc to the solenoids, while TRPL provides the negative side.
Features and Characteristics
- TMR Configuration Exclusive: TREL is solely available in Triple Modular Redundancy (TMR) form, emphasizing redundancy and reliability in its operational setup.
- Absence of Economizing Relay: Unlike its counterpart, TREG, TREL lacks an economizing relay, perhaps to streamline its functionality towards emergency protection without additional economizing features.
- No E-STOP Function: In contrast to TREG, TREL does not incorporate an E-STOP function, potentially due to its specialized focus on emergency overspeed protection.
- Multiple TREL Boards: The I/O controller possesses the capability to drive a secondary TREL board, enhancing redundancy or extending control over additional components for heightened safety measures.
Installation Process
Trip Solenoids Wiring
- Terminal Block Connection: The installation of the three trip solenoids involves their wiring to the first I/O terminal block. This block acts as the primary interface for these solenoids, facilitating their connection to the control system.
- Specific Arrangement: Detailed wiring configurations for these solenoids are outlined in the provided figure, ensuring accurate and precise connections to enable proper functionality within the system.
Trip Interlocks Integration
- Secondary Terminal Block Usage: Another critical aspect of the installation process involves integrating up to seven trip interlocks, which are connected to the second terminal block. These interlocks serve as additional safety measures within the system, enhancing the overall safety protocol.
- Wiring Arrangement: The wiring connections for these interlocks, conveying essential trip-related information, are specifically delineated in the provided documentation. They are designed to ensure efficient communication and response to potential trip scenarios.
Connector Details
- Connector J2: This component plays a pivotal role by carrying three power buses sourced from the TRPL (Terminal Relay Positive Line) system. These power buses are instrumental in providing the necessary electrical supply and support to the connected components.
- Connector JH1: Carrying the excitation voltage for the seven trip interlocks, JH1 acts as a conduit for supplying the required excitation voltage. This voltage is crucial for the proper functioning and activation of the interlocks, reinforcing the safety mechanisms in place.
Key Considerations
- Precision and Adherence to Diagrams: The wiring connections highlighted in the provided figure must be followed meticulously to ensure accurate installation and proper functionality of the trip solenoids and interlocks.
- System Integrity and Safety: Proper installation and connection of these components are critical for maintaining the integrity and effectiveness of the emergency overspeed protection system. Adherence to recommended guidelines and wiring configurations is essential to guaranteeing the system's safety and reliability.
Other Features
- Trip Solenoid Circuits: The trip solenoid circuits of the Expander Load Source Board are engineered to meet stringent safety and performance standards. These circuits are rated for NEMA class E creepage and clearance, ensuring optimal insulation and spacing to prevent electrical arcing and maintain reliable operation in demanding environments. Additionally, the circuits are designed to clear a 15 A fuse even with all circuits fully loaded, demonstrating robustness and resilience under high current conditions. The solenoid inductance is carefully managed to ensure a maximum L/R time constant of 0.1 sec, minimizing delay and ensuring rapid response times when activating the solenoids. Furthermore, suppression Metal Oxide Varistor (MOV) on TRPL across the solenoid provides enhanced protection against voltage surges and transients, safeguarding the solenoid circuits and associated components from damage.
- Relay Outputs: The relay outputs serve critical functions in controlling various components within the system. The driver to breaker relay K25A on TTUR ensures precise and reliable command execution for breaker operations, enhancing system safety and efficiency. Similarly, the servo clamp relay on TSVO facilitates controlled engagement and disengagement of servo mechanisms, contributing to precise control over system components and processes.
- Solenoid Control Relay Contacts: The solenoid control relay contacts are designed to handle inductive solenoid loads with efficiency and reliability. Rated to interrupt inductive solenoid loads at 125 V dc, 1 A, these contacts provide robust switching capabilities to ensure safe and effective control of solenoid circuits. Moreover, the contacts are engineered to withstand variations in bus voltage, which can range from 70 to 145 V dc, ensuring consistent performance and operation under varying voltage conditions.
- Trip Inputs: The trip inputs provide essential interlock functionalities for system protection and safety. With seven trip interlocks to the I/O controller protection module, operating at 125/24 V dc, these inputs enable the detection of critical fault conditions and facilitate prompt protective actions to safeguard the system and connected equipment. This comprehensive trip input system enhances the overall reliability and safety of the system, ensuring uninterrupted operation and minimizing the risk of damage or downtime due to unforeseen events.
The WOC team is always available to help you with your Mark VI requirements. For more information, please contact WOC.
Frequently Asked Questions
What is IS200TRELH1A?
It is an emergency trip board developed by GE under the Mark VI series.
What do board connectors JX1, JY1, and JZ1 contain?
These connectors house ID devices with unique serial numbers, board types, revision details, and plug locations, enabling the I/O controller to identify and verify terminal board information.
What happens if the ID device information doesn't match the expected values?
A hardware incompatibility fault is raised by the I/O controller, indicating a discrepancy between expected and detected information. This prompts an investigation into potential hardware compatibility issues.
Are there any jumpers or hardware settings available on the TREL board?
No, the board does not feature any jumpers or hardware settings.
