This module provides the final trip relay and solenoid interface for the Mark VI turbine protection system. It implements two-out-of-three (2oo3) voting logic using multiple relays to ensure safe and reliable turbine tripping during emergency conditions such as overspeed, emergency stop, or protection interlocks.

The board is designed to work in conjunction with the PPRO protection processor module and TRPG board, forming the last-stage hardware layer of the triple-redundant trip control circuit.

Core Functions

12 electromechanical relays total

9 relays arranged in 3 groups implementing 2-out-of-3 voting

3 relays for trip output actuation

Controls 3 trip solenoid valves

Supports:

Emergency overspeed protection

Emergency stop (E-Stop) functions

Trip interlock inputs

Power Supply & Redundancy

Supply voltage: 125 V DC

Compatible with H1B series mainstream specifications

Redundant power inputs:

JX1 / JY1 / JZ1 powered through diode OR-ing

Power source: Mark VI system rack redundant power supply

Typical power consumption: approximately 10 W

Interface & Wiring

Connection to PPRO module via molded plug cable

Terminal interfaces adapted for:

Trip solenoid valves

Energy-saving resistors

Emergency stop pushbuttons

7-channel trip interlock inputs

Designed to maintain clear power isolation within the trip relay circuit

Relay Configuration & Safety

Relay isolation between control logic and tripping circuits

High reliability for safety-critical turbine shutdown functions

Supports continuous monitoring and deterministic tripping behavior in TMR systems

Environmental Specifications

Operating temperature: 0 °C to +60 °C

Storage temperature: –40 °C to +85 °C

Mechanical Characteristics

Form factor: Mark VI standard I/O terminal board

Dimensions (approx.): 160 × 100 × 25 mm

Weight (approx.): 0.8 kg

Installation & Protection

Installation method:

Mark VI standard I/O rack terminal board slot installation

Supports hot plugging and unplugging

Protection rating: IP20

Suitable for installation inside control cabinets

Compatibility & System Integration

Fully compatible with Mark VI PPRO protection modules

Operates in conjunction with the TRPG board

Designed for triple-redundant trip control circuits

Seamless integration with Mark VI system software and protection logic

Typical Applications

Turbine emergency trip systems

Overspeed protection circuits

Safety shutdown systems for gas and steam turbines

Triple-redundant protection architectures

GE IS200TREGH2B｜Emergency Trip Terminal Board｜