Product Short Description
Product Name: ProTech-GII Triple Modular Redundant Overspeed Protection System
Product Introduction: The 8237-1246 is a dedicated, independent turbine safety device from Woodward’s ProTech-GII line, providing millisecond-level overspeed and over-acceleration trip protection for steam, gas and hydro turbines, fully separated from the primary governor control path.
Description
Technical Specifications:
- Architecture: TMR, 2-out-of-3 voting on trip relays
- Speed inputs: 3 × magnetic pickup or proximity (one per channel)
- Power: 90–264 VAC 47–63 Hz or 100–150 VDC, ~30 W
- Trip outputs: dual redundant voted relays + optional independent alarms
- Speed output: 4–20 mA per channel
- Response: ~12 ms detection-to-relay
- Comms: Modbus RTU for diagnostics
- Enclosure: bulkhead mount, IP56
- Vibration: 0.04 G²/Hz, 1.04 Grms 10–500 Hz
- Temp: -20 to +60 °C operating
- Dimensions: 330 × 486 × 153 mm
Functional Features: Online channel replacement, independent channel displays and keypads, SIL-3 capable per IEC 61508, acceleration-rate monitoring, event logging.
Working Principle: Three parallel channels measure shaft speed via MPU, compare to setpoint and acceleration limit, vote on discrepancy, and de-energize trip relays on 2-of-3 agreement to close fuel/steam stop valves.
Application Scenarios: Combined-cycle gas turbines, utility steam turbines, hydro turbine spurts, compressor drive trains requiring certified overspeed shutdown.
Structural Characteristics: Heavy metal bulkhead housing, three removable front display modules, rear terminal strip, isolated power supplies per channel.
Installation Requirements: Rigid bulkhead mounting with gasket; separate spare from control power; shielded MPU cabling with correct air gap; ground enclosure to turbine skid.
Usage Notes: Do not use as primary speed controller; test trip logic periodically; keep Modbus polling non-intrusive; verify 2/3 voting before bypassing any channel.
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