WOODWARD 8237-1246 ProTech-GII TMR Overspeed Protection Unit

WOODWARD 8237-1246 is a complete TMR overspeed protection unit of Woodward ProTech-GII series. It provides triple modular redundant overspeed protection for gas turbines, steam turbines and turbocompressors, using three independent channels to monitor rotor speed and execute emergency trip when overspeed occurs.

This unit complies with IEC 61508 SIL3 safety standard, supports speed probe signal acquisition, voting logic and relay trip output. It has built-in event recording and hardware self-diagnosis. Widely used in power, chemical and pulp & paper turbine safety protection maintenance, spare replacement and safety system retrofit projects.

Data Parameters

• 1. Brand: Woodward (USA).

• 2. Model: 8237-1246.

• 3. Product Type: ProTech-GII TMR Overspeed Protection Assembly.

• 4. Application: Gas / steam turbine, turbocompressor overspeed trip protection.

• 5. Feature: Triple Modular Redundancy, SIL3 certification, three independent monitoring channels.

• 6. Characteristic: Accept magnetic pickup pulse signals, 2-out-of-3 voting logic.

• 7. Input: Magnetic speed probe signal; Output: Trip relay contact.

• 8. Package: Integrated rack-mount safety protection unit assembly.

• 9. Mounting: Installed inside turbine control cabinet.

• 10. Operating Temperature: -20℃ ~ +60℃.

Core Functions

• 1. Collect pulse signals from three magnetic speed pickups and calculate real-time rotor speed independently per channel.

• 2. 2-out-of-3 voting logic to judge overspeed condition and trigger turbine emergency trip command.

• 3. Continuous hardware self-test on each channel to detect circuit faults, probe failures and wiring issues.

• 4. Store trip and alarm event logs for post-trip analysis and on-site troubleshooting.

• 5. Provide local status LED indicators and communication interface for parameter configuration and status viewing.

Application Scenarios

• 1. Power plant turbine ProTech-GII overspeed protection unit spare replacement.

• 2. Petrochemical plant turbocompressor safety interlock cabinet maintenance project.

• 3. Pulp and paper mill turbogenerator overspeed safety protection upgrade.

• 4. Heavy industry rotating machinery SIL3 safety instrumented system spare parts backup.

• 5. Old turbine overspeed protection system renewal and retrofit project.

FAQ

• 1. Q: What is WOODWARD 8237-1246?
      A: It is Woodward ProTech-GII SIL3 TMR overspeed protection unit for turbine and compressor overspeed trip protection.

• 2. Q: What is TMR?
      A: Triple Modular Redundancy, three independent channels, 2-out-of-3 voting to avoid false trip caused by single channel fault.

• 3. Q: Can it be hot swapped?
      A: Must strictly follow Woodward safety operation procedure, evaluate unit risk before replacement, online replacement is restricted.