Description
The Woodward ProTechGII (Part: 8237-2600 / 8200-1302) is an advanced, SIL-3 rated Overspeed Protection System specifically engineered for steam, gas, and hydro turbines. It serves as a critical safety barrier, providing high-speed detection of dangerous turbine overspeed conditions. The system utilizes independent, redundant sensor inputs to trigger emergency shutdown (ESD) relays, ensuring the mechanical integrity of the turbine by preventing catastrophic damage due to excessive rotational speeds.
📋 Technical Specifications
| Parameter | Specification |
|---|---|
| Product Name | ProTechGII Overspeed Protection System |
| Part Number | 8237-2600 (System) / 8200-1302 (Module/Component) |
| Safety Integrity | SIL-3 certified (IEC 61508) |
| Core Function | High-speed turbine overspeed protection and ESD |
| Input Channels | 3 independent Speed Sensor inputs (MPUs or Prox) |
| Output Type | Triplicated redundant trip relay outputs |
| Voting Logic | 2-out-of-3 (2oo3) logic for high reliability |
| Response Time | < 10 milliseconds (from detection to trip) |
| Mounting Style | 19-inch rack-mount or panel-mount chassis |
| Communication | Modbus TCP/IP or RTU for diagnostic monitoring |
🚀 Key Components & Integration
The ProTechGII is typically installed as a standalone safety layer independent of the main turbine controller (e.g., MicroNet or NetCon). Key associated components include:
- Magnetic Pickups (MPUs): Usually 3 separate sensors mounted on the turbine shaft to provide speed feedback to the ProTechGII.
- Emergency Trip Solenoids: The final control elements that dump hydraulic pressure or cut fuel to stop the turbine.
- ProTech GII Configuration Software: Required for setting the overspeed trip setpoints and defining the voting logic.
- Test Switch Panel: Used for manual “proof testing” of the overspeed logic without actually tripping the turbine.
- Power Supply Modules: Redundant 24V DC power inputs to ensure system availability.
⚠️ Integration and Safety Note
The ProTechGII is a safety-critical device; therefore, maintenance must be strictly controlled:
- Proof Testing: To maintain SIL-3 compliance, the system must undergo periodic “proof tests” where each input channel is simulated to verify that the 2-out-of-3 logic functions correctly without nuisance trips.
- Sensor Alignment: Proper gap setting for proximity sensors or depth for magnetic pickups is vital. Improper sensor distance is the most common cause of “Input Fault” alarms.
- Firmware: Always verify the firmware revision (via the diagnostic port) before attempting to modify parameters. Mismatched firmware can lead to unexpected system behavior or loss of safety certification.
