Relay and Transducer
Product Overview
The Woodward 8444-1104, designated as MFR300-71M/K42, is a multifunction relay and measuring transducer within the MFR 300 series. It is engineered for monitoring single- and three-phase power systems, combining protection relay functions with high-accuracy measurement capabilities in a single DIN-rail-mounted unit.

This specific variant, 8444-1104, was developed as a customized configuration based on the standard MFR300-71M (8444-1091). The adjustments were made to meet specific project requirements, introducing a new parameter for selecting the method of controlling unbalanced load and a minor modification to RoCOF (Rate of Change of Frequency) detection. The result is a relay tailored for applications such as steam turbine control systems, where precise power measurement and reliable protection are essential.

Key Specifications
The 8444-1104 is configured with the following primary ratings:

Voltage Measurement: 690 Vac (Delta) / 400 Vac (Wye)

Current Measurement: 1 A

Power Supply: 12/24 Vdc (operating range 8 to 32 Vdc)

Accuracy: Class 0.5 for voltage, frequency, and current; Class 1 for real and reactive power/energy

The unit features three true RMS voltage inputs and three true RMS current inputs, ensuring accurate measurement even in the presence of harmonics and distortions.

Protection Functions
The MFR300-71M/K42 integrates a comprehensive suite of ANSI-rated protection functions, configurable via Woodward‘s ToolKit software:

Over-/undervoltage (ANSI 59/27)

Over-/underfrequency (ANSI 81O/U)

Voltage asymmetry (ANSI 47)

Overload and unbalanced load (ANSI 32, 46)

Phase shift (ANSI 78)

Overcurrent (ANSI 50/51)

df/dt (ROCOF)

Ground fault

QV monitoring

Each protection function is equipped with configurable delay timers ranging from 0.02 to 300.00 seconds, allowing precise coordination with upstream and downstream protection devices.

Communication and Configuration
The device supports configuration and remote monitoring through multiple interfaces. The K42 option provides an RS-232 service port and a CAN bus interface for connectivity. The standard MFR 300 platform also supports CANopen and Modbus communication protocols, enabling integration into plant control systems and SCADA architectures.

Configuration is performed using Woodward’s ToolKit software. Users connect via a USB DPC cable, load the appropriate device configuration file, and access parameters through a structured code-level login system. For the 8444-1104, the relevant configuration files and technical documentation are available through Woodward‘s support portal.

Environmental and Physical Characteristics
The MFR300-71M/K42 is designed for demanding industrial environments:

Operating Temperature: -20 °C to +70 °C

Storage Temperature: -40 °C to +85 °C

Humidity: Up to 95%, non-condensing

Mounting: DIN rail

Altitude: Up to 2000 meters

The unit is UL/UCL Listed and CE marked, confirming compliance with applicable safety and electromagnetic compatibility standards.

Application Context
The 8444-1104 is particularly suited for steam turbine control systems and other power generation applications where the standard MFR300-71M configuration requires the specific unbalanced load control parameter and RoCOF detection behavior introduced in this variant. Its combination of measurement accuracy, configurable protection, and communication flexibility makes it a practical choice for both new installations and retrofit projects requiring a compact, multifunction relay solution.

Important Notice
When specifying or replacing an 8444-1104, the complete part number MFR300-71M/K42 8444-1104 should be referenced. The K42 option designation and the 8444-1104 configuration code distinguish this unit from other MFR 300 variants with different I/O configurations or firmware settings. For technical support, configuration files, or warranty inquiries, contact Woodward or an authorized Woodward representative.