Woodward 8237-1246

Product Name: 8237-1246 ProTech-GII Overspeed Protection Device

Product Description: Bulkhead-mounted triple modular redundant (TMR) overspeed protection relay designed to safely shut down steam, gas, and hydro turbines upon detection of overspeed or overacceleration events. Provides voted relay outputs for high and low voltage applications, ensuring reliable machinery protection in harsh industrial environments.

Category:
Description
Technical Specifications:
  • Dimensions: 330 × 486 × 153 mm
  • Enclosure Type: IP56
  • Power Input: 90–264 VAC / 47–63 Hz or 100–150 VDC @ 30 W per module
  • Output Voltage: 115 VAC / 240 VAC / 125 VDC (configurable)
  • Display: Three 4.2-inch operator interface displays
  • Vibration Resistance: 0.04 G²/Hz, 1.04 Grms, 10 to 500 Hz
  • Operating Temperature Range: –20 °C to +70 °C (–4 °F to +158 °F)
  • Response Time: Deterministic trip response <12 milliseconds
  • Safety Integrity: SIL 3 compliant, 2-out-of-3 voting logic

    Functional Features:

  • Triple Modular Redundancy (TMR) architecture with 2oo3 voting logic for fault tolerance
  • Simultaneous overspeed and overacceleration detection
  • Bulkhead-mounted design for harsh environment installation
  • High and low voltage voted relay outputs
  • Built-in self-diagnostics and fault reporting
  • Intuitive keypad and display interface for configuration and monitoring
  • Compatible with all sizes of steam, gas, and hydro turbines

    Application Scenarios:

  • Power generation plants (fossil, combined cycle, hydroelectric)
  • Oil and gas turbine-driven compressor trains
  • Marine propulsion turbine systems
  • Industrial manufacturing turbine equipment
  • Petrochemical refinery turbomachinery
  • Aerospace and defense turbine test facilities

    Material Composition:

  • Enclosure: Heavy-duty steel bulkhead enclosure with corrosion-resistant powder coating
  • Internal Modules: Three independent speed measurement and control modules with galvanic isolation
  • Connectors: Industrial-grade circular connectors with environmental sealing
  • Display Assembly: Sealed membrane keypad and LCD display modules
  • Mounting Hardware: Stainless steel bulkhead mounting brackets

    Structural Characteristics:

  • Three-module redundant design with separate power, sensing, and output circuits
  • Front-accessible operator interface with three independent display/keypad modules
  • Bulkhead mounting flange for panel or wall installation in harsh locations
  • Sealed construction for IP56 dust and water ingress protection

    Working Principle:

    Three independent speed measurement modules receive turbine speed signals from separate speed sensors. Each module independently calculates speed and acceleration, comparing values against user-configured trip setpoints. A 2-out-of-3 voting circuit evaluates the three module outputs: if two or more modules detect an overspeed or overacceleration condition, the unit initiates a turbine shutdown via voted output relays. This architecture eliminates single points of failure and ensures reliable protection.

    Installation Requirements:

  • Mount on a rigid bulkhead or panel with sufficient structural integrity to withstand vibration
  • Ensure proper orientation with displays and keypad accessible for operation and maintenance
  • Connect speed sensors using shielded twisted-pair cable, routed separately from power cables
  • Wire power and output relay circuits according to Woodward wiring diagrams and local electrical codes
  • Allow adequate clearance around the enclosure for heat dissipation and cable access

    Usage Precautions:

  • Do not adjust trip setpoints below manufacturer-recommended minimum values without engineering approval
  • Perform periodic functional tests and calibration verification to ensure protection integrity
  • Only qualified personnel should perform configuration and maintenance procedures
  • Keep enclosure covers secured at all times to maintain IP56 environmental protection
  • Do not connect or disconnect wiring while power is applied to avoid equipment damage and electrical hazard
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