Woodward LR20025 MFR13 Series Multifunction Unit

Configured for high-fidelity signal processing in decentralized power networks, the Woodward LR20025 (MFR13 Multifunction Unit) provides direct physical/electrical execution. The hardware operates as a high-precision multifunction protection relay that monitors three-phase voltage, frequency, and power parameters across wind turbine generators and grid-tie interfaces.

Hardware Specifications

V/Hz and Field-Oriented Vector Control Integration

The device tracks electrical line variables to support external V/Hz and field-oriented vector control systems during synchronization. Its high-resolution True RMS sensing evaluates phase angle deviations and provides real-time harmonic distortion suppression profiles. The 8 independent discrete relay outputs drive local interlocking circuits, establishing rapid actuator loop feedback response metrics when grid voltage transients cross safe trip limits. This ensures that field-side fault energy is isolated before thermal heat sink dissipation profiles in the adjacent inverter assemblies exceed operational tolerances.

Frequently Asked Questions

Q: Can the current sensing inputs of the LR20025 be connected directly to the primary power lines?

A: No. The current sensing architecture relies on external current transformers with a secondary output range of 0.5 to 5 A. Direct connection to primary high-voltage conductors will result in catastrophic failure of the internal measurement circuitry.

Q: How does the device handle communication failures on the CAN bus interface?

A: The CAN bus interface works independently of the localized protective relay logic. If a network disruption occurs, the internal processor continues to execute over/under voltage and frequency protection parameters based on physical input sampling, driving the local discrete relay outputs autonomously.

Field Installation Guidelines

• Install the housing within a standard panel cutout or secure it using a verified DIN rail adapter to maintain mechanical stability under high-vibration conditions.
• Route all three-phase high-voltage sensing cables (250 - 690 VAC) through separate conduit layouts away from low-voltage DC signals and CAN bus data lines.
• Verify that the external current transformer secondary wires are properly grounded at a single point before completing termination at the current input block.
• Connect the main chassis grounding point directly to the central plant electrical earth using a heavy-gauge copper braid to minimize common-mode noise issues.