IS210TREGH4B

IS210TREGH4B is an emergency trip terminal board assembly developed by General Electrics. It is a part of Mark VI control system. The TREG system plays a critical role in ensuring the safety and functionality of various emergency functions within a larger system. Specifically, it serves as the power source for three emergency trip solenoids, all of which are under the precise control of the I/O controller.

Features

• Responsible for supplying power to the three emergency trip solenoids. These solenoids are crucial for triggering essential safety measures in response to specific conditions or events.
• It is designed to accommodate up to three trip solenoids, and these solenoids are connected between the TREG and TRPG terminal boards. Each solenoid is strategically positioned to respond to distinct emergency scenarios.
Provides the positive side of the direct current (DC) power to the connected solenoids. This positive power supply is essential for energizing and activating the solenoids when required. It is designed to accommodate up to three trip solenoids, and these solenoids are connected between the TREG and TRPG terminal boards. Each solenoid is strategically To complete the circuit and ensure proper functionality, the TRPG terminal boards come into play by providing the negative side of the DC power. This complementary power source from TRPG is essential for enabling the solenoids to perform their emergency trip functions effectively. It is designed to accommodate up to three trip solenoids, and these solenoids are connected between the TREG and TRPG terminal boards. Each solenoid is strategically The I/O controller takes on a central role in the operation of this system. It is responsible for overseeing and managing several critical functions:
• Emergency Overspeed Protection: The I/O controller monitors the speed of the system and can engage emergency overspeed protection measures to prevent dangerous acceleration.
• Emergency Stop Functions: In case of any critical issues or emergencies, the I/O controller can initiate emergency stop functions to halt the system immediately.
• Relay Control: TREG hosts a set of 12 relays, and the I/O controller is in charge of controlling these relays. Nine of these relays are organized into three groups of three. These relay groups work in a voting system, where the inputs are assessed collectively, ensuring redundancy and reliability. This mechanism allows for effective control of the three trip solenoids, enhancing safety and response capabilities.

Operation

The operation of the TREG system is highly streamlined and reliant on the precise control provided by the I/O controller. This control scheme ensures the safety and functionality of the entire system, with minimal external connections to the control modules.

• I/O Controller Dominance: The I/O controller serves as the central brain of the system, exercising complete authority over its functions. It orchestrates and coordinates all actions and responses, making it a crucial component for the system's overall performance and safety.
• Control Module Connections: TREG maintains a minimalist approach when it comes to external connections. The only two connections it has to the control modules are as follows:
• J2 Power Cable: This cable is responsible for supplying power. It acts as the lifeline that ensures TREG remains operational and ready to respond to emergency situations. This power connection is fundamental to keeping the system active and prepared for action.
• Trip Solenoid Connections: The primary means through which TREG interacts with the wider system is through the trip solenoids. These solenoids are crucial for initiating emergency shutdowns or other critical actions when necessary. The control signals from the I/O controller are transmitted through these solenoids, enabling precise and rapid responses to emergency conditions.
• Simplex System Functionality: In simplex systems, an additional cable, known as the third cable, comes into play. This cable carries a trip signal from J1 to the TSVO terminal board. This trip signal is particularly important because it facilitates a servo valve clamp function when the turbine undergoes a trip event. This feature is critical for ensuring that the turbine is safely brought to a stop or controlled state during emergency scenarios.
• In essence, TREG's operation is characterized by its reliance on the I/O controller for control and coordination. Its connections are kept minimal and purpose-driven, with power supply through the J2 cable and communication via the trip solenoids. In simplex systems, the introduction of the third cable adds an extra layer of safety by enabling precise control of the servo valve during turbine trip events. This careful design and control strategy make TREG an integral component in maintaining the safety and reliability of the larger system it is a part of.

Attributes

• Trip interlock isolation: Optical isolation to 1500 V on all inputs
• Trip interlock filter: Hardware filter, 4 ms
• Trip interlock ac voltage rejection: 60 V rms
• Solenoid response time: Solenoid L/R time constant is 0.1 second

Solenoid Trip Tests

• Solenoid Trip Tests involve the utilization of application software within the controller to execute tests on trip solenoids. These tests can be conducted online, enabling the individual tripping of each solenoid sequentially. This can be achieved either through the PTR (Protection, Trip, and Release) relays from the controller or via the ETR (Emergency Trip Relay) relays from the protection module.
• For confirmation of solenoid operation, a contact from each solenoid circuit is connected back as a contact input, providing a positive indication that the solenoid has indeed tripped.
• Furthermore, the system incorporates primary and emergency offline overspeed tests. These tests serve the purpose of validating genuine trip occurrences by simulating overspeed conditions through software. This verification process ensures the reliability and functionality of the solenoids in response to critical operational parameters, bolstering the overall safety and efficiency of the system.