Woodward 8237-1247 ProTech-GII Overspeed Protection Relay

Overview

The 8237-1247 ProTech-GII bulkhead relay from Woodward is a dedicated overspeed and overacceleration protection device for turbines and critical rotating equipment. It operates as part of the ProTech-GII protection architecture, continuously evaluating rotor speed and acceleration data and initiating a shutdown signal when preset safety thresholds are exceeded.
The bulkhead-mounted construction is intended for fixed installation in turbine enclosures or protection panels where environmental robustness and wiring accessibility are required.

Functional Description

The 8237-1247 overspeed relay processes pulse signals from magnetic speed pickups and compatible sensors to determine real-time shaft speed and rate of change. When abnormal operating conditions such as overspeed or rapid acceleration are detected, the unit energizes trip outputs connected to the turbine trip valve or shutdown system. Integrated event recording supports post-trip analysis and maintenance diagnostics.

​Technical Specifications

• Product Series: ProTech-GII
• Device Type: Overspeed and Overacceleration Protection Relay
• Manufacturer: Woodward
• Model / Part Number: 8237-1247
• Mounting Style: Bulkhead mount
• Enclosure Rating: IP56, dust-tight and protected against high-pressure water jets
• Supply Voltage Options:
  • High-level DC input: 100–150 VDC
  • Low-level DC input: 10–36 VDC
    Configuration depends on ordered variant
• Current Limiting: 500 mA
• Speed Sensor Inputs:
  • Passive magnetic pickups (MPU)
  • Active magnetic pickups
  • Hall-effect speed sensors
• Additional Inputs: Discrete and analog signals for status and supervision
• Communication Capabilities: Modbus, CANbus, or Ethernet depending on configuration
• Event Recording: Trip and alarm logging with time stamping
• Operating Temperature Range: –30 °C to +70 °C
• Dimensions: 330 × 486 × 153 mm
• Weight: 5 kg

Key Capabilities

• High-speed overspeed trip response suitable for turbine safety systems
• Independent monitoring of speed and acceleration parameters
• Compatibility with a wide range of magnetic pickup technologies
• Rugged enclosure designed for turbine halls and outdoor installations
• Communication interfaces for integration with plant control or monitoring systems

Typical Applications

• Gas turbine overspeed protection
• Steam turbine safety systems
• Hydro turbine protection panels
• Compressors, generators, and other high-inertia rotating machinery

FAQ

What type of sensors can be connected to the 8237-1247?
The relay supports both active and passive magnetic pickups as well as Hall-effect speed sensors commonly used in turbine applications.

Is the unit suitable for harsh environments?
Yes. The IP56 enclosure and wide operating temperature range make it suitable for demanding industrial and power-generation environments.

Can this relay communicate with a DCS or PLC?
Depending on configuration, the device supports Modbus, CANbus, or Ethernet for integration with plant control and monitoring systems.