IS200TREGH3B - Turbine Emergency Trip Board

SPECIFICATIONS

Part No.: IS200TREGH3B
Manufacturer: General Electric
Series: Mark VI
Trip interlock isolation: Optical isolation to 1500 V
Trip interlock filter: Hardware filter, 4 ms
Trip interlock ac voltage rejection: 60 V rms
Size: 17.8 cm wide x 33.02 cm, high
Number of trip solenoids: Three
Availability: In Stock
Country of Manufacture: United States (USA)

Functional Description

IS200TREGH3B is a Turbine Emergency Trip Board developed by GE. It is a part of mark VI control system. The module is responsible for providing power to the emergency trip solenoids and ensuring safe and reliable operation. Controlled by the I/O controller, the module plays a pivotal role in executing essential emergency functions and coordinating critical relay operations. The primary function of TREG is to supply power to three emergency trip solenoids. These solenoids serve as critical components for initiating the emergency trip of the turbine in case of potential hazards or overspeed conditions. The TREG module is designed to deliver the positive side of the dc power required to actuate these solenoids effectively.

Features

• It is connected to the Turbine Relay Power Ground terminal board, which serves as the counterpart providing the negative side of the dc power to the trip solenoids. This connection ensures a complete circuit and enables precise and reliable control over the solenoids, ensuring their efficient functioning during emergency situations.
• In addition to supplying power to the trip solenoids, the I/O controller is responsible for providing crucial safety features. It oversees the emergency overspeed protection function, which is designed to monitor the turbine's rotational speed continuously. If the turbine's speed exceeds predefined safe limits, the I/O controller initiates the emergency trip sequence, leading to the activation of the trip solenoids and the subsequent shutdown of the turbine to prevent any potential damage.
• I/O controller controls the emergency stop functions, allowing immediate shutdown of the turbine under critical conditions. This feature ensures the rapid cessation of turbine operations in response to safety concerns or system abnormalities, promoting the safety of personnel and equipment.
• It houses 12 relays, and the I/O controller takes charge of their control and coordination. These relays play a crucial role in the emergency trip protection system, allowing the I/O controller to monitor various inputs and make informed decisions based on the voting logic.
• Nine out of the twelve relays on the module are organized into three groups of three. This configuration forms a voting system, where the I/O controller takes input signals from different sensors, monitors, or speed pickups, and uses the voting logic to make critical decisions. Based on the voting results, the I/O controller determines the appropriate action and controls the trip solenoids via the module to execute the emergency trip sequence when needed.

Operation

• The TREG module operates as a crucial component in the turbine control system, responsible for emergency trip functions and actuating critical hydraulics during a turbine trip event. It is entirely controlled by the I/O controller, forming an essential link in the safety and protection mechanisms of the turbine.
• The control connection between TREG and the control modules primarily relies on the J2 power cable. This cable facilitates communication and power transfer between the TREG module and the I/O controller. The I/O controller supplies 28 V dc to the nine trip relay coils, ensuring their proper operation.
• In simplex systems, an additional cable carries a trip signal from J1 to the TSVO (Turbine Servo Valve Open) terminal board. This trip signal provides a servo valve clamp function upon turbine trip. The clamp function ensures that the turbine's servo valves are securely closed during an emergency trip, preventing any uncontrolled or undesirable movements.
• Both the TRPG and TREG modules play a role in controlling the trip solenoids. The module provides the negative side of the 125 V dc power supply to the solenoids, while the module supplies the positive side. This dual control mechanism ensures redundancy and fault tolerance. Either module can remove power from the trip solenoids and actuate the hydraulics to close the steam or fuel valves, enabling a rapid and effective emergency shutdown when needed.
• The module supplies 125 V dc to the trip solenoids through plug J2. These solenoids draw up to 1 A of current with a 0.1-second L/R time constant. The high-voltage supply and rapid response characteristics of the solenoids enable them to actuate the hydraulics swiftly during an emergency trip event.

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Frequently Asked Questions

 

What is IS200TREGH3B?
It is a Turbine Emergency Trip Board developed by GE

What happens if any of the diagnostic values do not match the desired values?
If any of the diagnostic values do not agree with the desired values, the I/O controller detects a fault. This fault indicates a potential issue or deviation from the expected performance of the TREG board and its connected components. The fault notification prompts operators and maintenance personnel to investigate and address the problem promptly, ensuring the reliability and safety of the system.

How do the ID devices on connectors JX1, JY1, and JZ1 enhance compatibility and identification?
Connectors JX1, JY1, and JZ1 are equipped with ID devices that contain vital information. These read-only chips are coded with essential details such as the terminal board's serial number, board type, revision number, and the plug location. The ID devices help ensure proper identification and compatibility checking when connecting to the I/O controller.

What happens if there is a mismatch encountered when reading the ID devices on TREG connectors?
When the I/O controller reads the ID device on any of the connectors (JX1, JY1, or JZ1) and identifies a mismatch, such as an incorrect serial number or plug location, a hardware incompatibility fault is generated. This fault indicates a potential issue with the connection or identification, alerting users to resolve the mismatch for proper system functioning.

. How do these diagnostics and ID devices contribute to system reliability and maintenance?
The diagnostics performed by the I/O controller on the board and its connected devices ensure that any deviations or faults are promptly detected and addressed, preventing potential failures and enhancing system reliability. The presence of ID devices on connectors facilitates easy and accurate identification of terminal boards, streamlining maintenance activities and ensuring proper compatibility during system setup or upgrades.