Woodward 8444-1091 MFR300 Series Multifunction Relay

The Woodward 8444-1091, also cataloged as the 8444-1091 Multifunction Relay and Measuring Transducer, operates as a dedicated hardware component for multi-phase electrical parameter evaluation, synchronous power network monitoring, and localized generator/busbar circuit protection within industrial distribution grids.

Hardware Specifications

Industrial Drives & Governor Control Loop Networks

• V/Hz and Field-Oriented Vector Control Coordination The multifunction relay tracks incoming three-phase voltage and frequency vectors with Class 0.5 precision. When tied into prime mover control topologies, these instantaneous phase metrics provide the tracking baseline needed to manage V/Hz ratios during generator synchronization, preventing severe reactive torque surges from entering coupled engine shafts.
• Actuator Loop Feedback Response and Thermal Dissipation Profiles The internal microprocessing engine computes true RMS values and matches them against configurable protection profiles within a deterministic execution window. The physical chassis uses an optimized surface-area-to-mass profile to maximize natural convection cooling across its -20 to +70 deg C operating window, allowing the solid-state switching components to drive downstream trip circuit actuators without thermal de-rating.

Frequently Asked Questions

Q: How does the Class 0.5 and Class 1 accuracy rating profile impact power management system integration?

A: The Class 0.5 rating guarantees a maximum measurement variance of ±0.5% for foundational variables like voltage and current, while the Class 1 rating ensures a ±1.0% tolerance for derived real and reactive power metrics. This tight resolution allows utility-grade power management systems to execute precise load-sharing calculations and microgrid profiling directly from the transducer outputs.

Q: What are the protection consequences if the input operating voltage drops down to the 8 VDC absolute lower bound?

A: The internal power regulation stages maintain stable logic rails across the entire 8 to 32 VDC window. If the supply voltage drops below the 8 VDC threshold during engine cranking or low-battery anomalies, the internal brownout logic triggers a systematic reset, forcing all output protection contacts to transition safely to their de-energized states.