Key Features

• Triple Modular Redundancy (TMR): Three VPRO boards in a dedicated protection module ensure high system availability and fault tolerance for emergency overspeed functions.
• Dedicated Emergency Trip Logic: The VPRO board provides an independent emergency trip mechanism, enabling safe, rapid turbine shutdown during critical events.
• IONet Communication: An Ethernet interface supports IONet connectivity, facilitating data exchange with control modules for integrated system oversight.
• Trip Solenoid Control: Up to three trip solenoids are managed through TREG (positive side) and TRPG (negative side) terminal boards, each supplied with 125 V DC for redundant, resilient control.
• Overspeed and Emergency Stop Management: The board directly governs overspeed detection and emergency stop sequences, ensuring rapid and reliable turbine protection.
• Redundant Relay Logic: TREG manages 12 relays, with nine arranged in three groups of three to implement a voting scheme that controls the trip solenoids, reinforcing system reliability.

Power Supply Architecture

• Each VPRO board includes an independent on-board power supply that converts 125 V DC from the cabinet’s Power Distribution Module (PDM) into 5 V DC and 28 V DC for internal circuitry.
• With three VPRO boards, the protection module benefits from three independent power sources, improving fault tolerance and minimizing single-point failure risks.
• TREG is controlled entirely by the VPRO boards, with only a J2 power cable and trip solenoid connections linking it to the control modules.
• In simplex configurations, an additional cable from J1 to the TSVO terminal board carries a trip signal, activating a servo valve clamp function during turbine trips for enhanced safety.