Overview

The Woodward 8404-067 ProTech-GII is a triple-redundant overspeed protection system designed for critical turbine applications. It continuously monitors rotor speed and acceleration, ensuring a safe shutdown during overspeed or unsafe operating conditions. This system is ideal for steam, gas, and hydro turbines in high-availability environments, where reliability and safety are paramount.

ProTech-GII operates with three independent modules (A, B, and C) and offers configurable 2-out-of-3 or 3-out-of-3 voting logic. Each module receives input from magnetic pickups and controls trip relays to initiate a safe shutdown if thresholds are exceeded. The system also supports online testing and repair, allowing maintenance without interrupting turbine operation. Its Modbus RTU communication and 4–20 mA outputs facilitate seamless integration into plant control systems.

Designed for harsh industrial environments, the 8404-067 is housed in an IP56-rated cabinet, providing protection against dust, moisture, and other environmental factors. Engineers rely on its fault tolerance, diagnostic capabilities, and compliance with CE and UL standards to ensure asset protection and operational safety.

Technical Data

Typical Applications

Steam Turbines: Monitors rotor speed and initiates a trip to valves during overspeed events.

• Gas Turbines: Provides rapid shutdown to prevent mechanical damage during unsafe conditions.

• Hydro Turbines: Ensures safe operation during load rejection or runaway conditions.

• Industrial Safety Systems: Integrates with emergency shutdown logic across plant-wide systems.

• Offshore Platforms: Protects rotating equipment in remote and hazardous environments.

For instance, in a power generation facility, the 8404-067 continuously monitors turbine speed and initiates a shutdown if speed thresholds are exceeded, preventing catastrophic mechanical failures and ensuring regulatory compliance.

FAQ

Q1: What makes the 8404-067 highly reliable?
Its triple-redundant design and online testing features ensure fault tolerance and continuous operation, even if one module fails.

Q2: Can the system be tested without shutting down the turbine?
Yes, each module supports online testing and repair, allowing for system maintenance without interrupting turbine operation.

Q3: What communication protocols are supported?
The system supports Modbus RTU and provides 4–20 mA analog outputs for integration with plant control systems.

Q4: What power inputs are accepted?
It accepts dual high-voltage or mixed high/low voltage inputs, ensuring redundancy and continued operation during power fluctuations.

Q5: Is it suitable for outdoor or harsh environments?
Yes, when mounted in its standard cabinet, it meets IP56 standards, providing dust and water protection for outdoor and harsh environments.