Woodward 8237-1247 ProTech-GII Over-Speed Detection System

Description

The Woodward 8237-1247 is a triple modular over-speed detection system designed to monitor turbine rotor speed and acceleration for industrial turbines. Operating via active or passive magnetic pickups (MPUs), the unit issues a precise shutdown command to the turbine trip valve or corresponding trip system. The 8237-1247 features a bulkhead mount enclosure with IP56 dust and water resistance, integrating 4 to 20 mA speed readouts and Modbus communications. It utilizes two redundant trip relays and supports high-voltage power inputs to ensure reliable safety instrumented protection across hydro, steam, and gas turbine applications.

Features

• Triple modular design enabling online replacement of individual modules during operation
• Active or passive MPU detection for rotor speed and acceleration monitoring
• Two redundant trip relays for reliable emergency shutdown execution
• 4 to 20 mA speed readouts and Modbus communication support
• Resistance to sulfur contamination, H2S, and CO2 gases
• Built-in routine testing functionality using an internal frequency generator

Applications

• Hydro turbines
• Steam turbines
• Gas turbines
• Turbine over-speed and over-acceleration protection systems

Technical Specifications

Installation Guidelines

• Mount the bulkhead unit securely in a standard industrial cabinet door environment.
• Wire active or passive MPUs to the designated signal inputs for accurate turbine speed and acceleration monitoring.
• Connect high-voltage (100 to 150 Vdc) or low-voltage (nominal 24 Vdc) power supplies according to the module rating specifications.
• Verify redundant trip relay connections to the turbine trip valve prior to system commissioning.

Compliance and Certifications

• IEC 721-3-3 1994 classification