8444-1109 Multifunction Relay (Industrial-Grade Power Monitoring Solution)

The 8444-1109 from Woodward delivers enterprise-level electrical parameter monitoring and fault protection for mission-critical power generation assets. This integrated relay-transducer platform consolidates voltage sensing, current measurement, frequency tracking, and automated protection logic into a single DIN-rail mountable unit—eliminating the complexity and cost of deploying multiple discrete protective devices across generator control panels, switchgear assemblies, and industrial distribution systems.

Designed for operators managing standby generators, cogeneration facilities, microgrids, and heavy industrial motor feeders, the 8444-1109 addresses the persistent challenge of coordinating protection schemes while maintaining real-time visibility into electrical system health. By combining ANSI/IEEE-compliant protection functions with precision power quality analytics, this relay enables predictive maintenance strategies that reduce unplanned outages and extend capital equipment lifespan.

Whether you're safeguarding a 500 kW diesel genset in a data center, monitoring a 2 MW gas turbine CHP plant, or protecting critical process motors in chemical manufacturing, the 8444-1109 provides the measurement accuracy, communication flexibility, and environmental ruggedness required for 24/7 industrial operation.

Key Features & Technical Advantages

→ Consolidated Protection Architecture
Replaces 4-6 single-function relays with one unified device covering overvoltage (59), undervoltage (27), over/under frequency (81 O/U), reverse power (32), phase unbalance (46), and ground fault (50N/51N) protection—reducing panel footprint by up to 60% while simplifying wiring and commissioning.

→ Precision Electrical Measurement
Class 0.5 accuracy for active/reactive/apparent power, voltage (50-690V L-L), current (0.1-10A direct input), frequency (±0.01 Hz resolution), power factor, and harmonic distortion up to the 31st order—providing laboratory-grade data for load profiling and efficiency optimization.

→ Dual-Protocol Communication
Simultaneous Modbus RTU and Ethernet/IP connectivity enables integration with legacy SCADA systems and modern IoT platforms, supporting remote parameter adjustment, alarm notification, and historical trend analysis without requiring protocol converters or gateways.

→ Programmable Logic & Alarming
User-configurable trip curves, time delays, and alarm thresholds allow precise coordination with upstream circuit breakers and downstream contactors, ensuring selective fault isolation that maintains service continuity for non-faulted loads.

✓ Industrial Environmental Rating
Operates reliably across -25°C to +70°C ambient temperatures with conformal-coated electronics for moisture resistance, making it suitable for outdoor generator enclosures, marine engine rooms, and harsh manufacturing environments.

✓ Non-Volatile Event Recording
Stores 500+ time-stamped fault events, alarm activations, and parameter excursions in permanent memory, providing forensic data for root cause analysis and regulatory compliance documentation.

Application Scenarios & Use Cases

Emergency Generator Monitoring
Data centers, hospitals, and telecom facilities deploy the 8444-1109 to monitor standby diesel generators, automatically detecting voltage sags, frequency deviations, and phase loss conditions that could damage IT loads or violate utility interconnection agreements. The relay's reverse power function prevents accidental backfeed into utility grids during transfer operations.

Combined Heat & Power (CHP) Plants
Industrial cogeneration systems use this relay to track electrical output from gas turbine or reciprocating engine generators while coordinating with thermal control systems. Real-time power quality monitoring identifies combustion issues before they escalate into forced outages, while harmonic analysis ensures compliance with IEEE 519 grid connection standards.

Microgrid & Islanding Applications
Renewable energy installations and remote industrial sites leverage the 8444-1109's frequency and voltage monitoring to manage seamless transitions between grid-connected and islanded operation modes. Programmable under-frequency load shedding prevents generator overload during grid separation events.

Critical Motor Protection
Chemical plants, water treatment facilities, and mining operations protect high-value motors (pumps, compressors, conveyors) by detecting phase imbalance, ground faults, and overload conditions before thermal damage occurs—reducing motor replacement costs and eliminating production losses from unexpected failures.

Marine & Offshore Power Systems
Shipboard generators and offshore platform power plants benefit from the relay's wide voltage range (50-690V), conformal coating, and vibration resistance, ensuring reliable protection in environments where equipment failure can compromise vessel safety or production uptime.

Technical Specifications & Selection Guide

Selection Criteria: Choose the 8444-1109 when you need comprehensive protection and measurement in a single device for generators rated 10 kW to 3 MW, or motor feeders up to 500 HP. For applications requiring differential protection or arc flash detection, consider pairing with dedicated protective relays. Verify CT ratios match your existing current transformers, or specify new CTs during procurement.

Advanced Capabilities & Integration Options

SCADA & BMS Integration: Native support for Modbus TCP and Ethernet/IP protocols enables plug-and-play connectivity with Schneider Electric, Siemens, Rockwell Automation, and Honeywell control systems. OPC UA server functionality (optional firmware) provides direct integration with modern cloud-based analytics platforms.

Custom Logic Programming: Built-in ladder logic editor allows creation of custom interlock sequences, automatic transfer switch (ATS) coordination, and load-dependent start/stop algorithms without external PLCs—reducing system complexity and points of failure.

Remote Configuration & Diagnostics: Web-based interface accessible via Ethernet port permits parameter adjustment, firmware updates, and waveform capture from any network-connected device, eliminating the need for on-site visits during commissioning or troubleshooting.

Delivery, Warranty & Technical Support

Lead Time: Standard units ship within 3-5 business days from our regional distribution centers. Custom-configured relays with pre-programmed setpoints or special communication modules require 10-15 business days.

Warranty Coverage: 12-month manufacturer warranty against defects in materials and workmanship, with optional extended service agreements available for critical infrastructure applications. Warranty includes firmware updates and technical support access.

Technical Assistance: Our application engineering team provides pre-sales sizing calculations, protection coordination studies, and commissioning support. Post-installation, 24/7 technical hotline access ensures rapid resolution of configuration questions or operational issues.

Documentation Package: Each relay ships with installation manual, quick-start guide, Modbus register map, and configuration software (Windows-compatible). CAD drawings and protection coordination templates available for download.

Frequently Asked Questions

How does the 8444-1109 simplify generator protection panel design?
By consolidating voltage, current, frequency, and power protection into one device, you eliminate the need for separate overvoltage relays, underfrequency relays, reverse power relays, and power meters—reducing panel space requirements by 50-70%, cutting wiring labor by 40%, and simplifying troubleshooting with a single configuration interface.

What current transformer ratios are compatible with this relay?
The 8444-1109 accepts any standard CT ratio from 5:5 (direct) up to 5000:5, programmable through the front panel or configuration software. For loads under 10A, you can connect current-carrying conductors directly through the relay's input terminals without external CTs.

Can this relay monitor power quality parameters for utility interconnection compliance?
Yes—the device tracks total harmonic distortion (THD), individual voltage and current harmonics up to the 31st order, voltage unbalance, and power factor. These measurements help demonstrate compliance with IEEE 519, IEEE 1547, and utility-specific power quality requirements for distributed generation interconnection.

Is the 8444-1109 suitable for marine or offshore oil & gas installations?
The relay meets IEC 60068 environmental testing standards and features conformal-coated circuit boards for enhanced corrosion resistance. When installed in IP54 or higher-rated enclosures, it performs reliably in marine engine rooms, offshore platform generator skids, and other high-humidity, high-vibration environments.

How do I retrieve fault event logs for incident analysis?
Event logs are accessible three ways: (1) scroll through the front-panel LCD display, (2) download via Modbus/Ethernet to a SCADA system or PC, or (3) export as CSV files using the configuration software. Each event includes timestamp, fault type, measured values at time of trip, and relay response action.

What's the difference between this relay and single-function protective devices?
Traditional protection schemes use separate relays for each function (voltage, frequency, current, power), requiring individual wiring, configuration, and testing. The 8444-1109 integrates all functions with shared voltage/current sensing, unified configuration, and coordinated trip logic—improving reliability while reducing installation and maintenance costs by 30-50%.

Ready to Upgrade Your Power Monitoring System?

Contact our technical sales team for application-specific sizing, protection coordination analysis, and volume pricing. We provide same-day quotations, expedited shipping for urgent projects, and complimentary commissioning support for multi-unit installations.

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