UR8FH Transformer Interface Module (Industrial-Grade CT/VT Input Solution)

The UR8FH Transformer Interface Module is a precision-engineered CT/VT input component designed for GE Multilin Universal Relay (UR) Series protection platforms. This module captures real-time current and voltage signals from power transformers, enabling comprehensive monitoring, fault detection, and protective relay coordination across utility substations, industrial power distribution networks, and critical infrastructure facilities.

Built to withstand harsh electrical environments, the UR8FH serves as the primary signal acquisition interface for three-phase power systems, delivering measurement-grade accuracy for metering, protection logic, and SCADA integration. Whether you're upgrading legacy relay systems or deploying new substation automation projects, this module provides the reliability and flexibility demanded by modern power system operators.

With support for both 1A and 5A current transformer secondaries, configurable voltage ranges up to 240V AC, and hot-swappable architecture, the UR8FH minimizes installation complexity while maximizing operational uptime. Its modular design integrates seamlessly into existing UR Series chassis, reducing retrofit costs and simplifying spare parts inventory management.

Core Capabilities & Technical Advantages

→ Eight Independent Current Channels
Monitor up to eight CT inputs simultaneously for complete three-phase measurement including neutral and ground fault detection. Each channel handles transient overcurrents up to 100x nominal rating without signal saturation, ensuring accurate fault recording during short-circuit events.

→ Four Voltage Transformer Inputs
Capture phase-to-neutral or phase-to-phase voltages from 57.7V to 240V AC. Configurable VT ratios accommodate diverse system voltages from low-voltage industrial distribution (480V) to medium-voltage utility substations (34.5kV with appropriate VTs).

→ Metering-Class Accuracy (0.2%)
Meets IEC 61850 and IEEE C37.90 standards for revenue-grade metering applications. Advanced anti-aliasing filters eliminate harmonic distortion, ensuring measurement integrity even in non-linear load environments with variable frequency drives or rectifier systems.

→ Hot-Swappable Modular Architecture
Replace or upgrade the UR8FH without de-energizing the entire relay system. Field-replaceable design reduces mean time to repair (MTTR) and allows phased system upgrades without extended outages.

→ Extended Temperature Range (-40°C to +85°C)
Operates reliably in outdoor switchgear enclosures, desert climates, and arctic installations. Conformal coating protects against humidity, dust, and corrosive atmospheres common in industrial and marine environments.

✓ Software-Configurable CT/VT Ratios
Eliminate hardware jumpers and DIP switches. All input scaling, polarity, and wiring configurations are managed through the UR Setup software interface, reducing commissioning time and minimizing wiring errors.

Industry Applications & Use Cases

Utility Substation Protection
The UR8FH serves as the signal acquisition front-end for transmission and distribution substations. When paired with the GE F60 Feeder Protection System, it enables overcurrent, directional, and distance protection schemes. Utilities benefit from reduced panel space requirements compared to discrete electromechanical relays, while gaining advanced fault location and power quality monitoring capabilities.

Industrial Motor Control Centers
Integrate with the GE SR469 Motor Protection Relay to monitor motor current imbalance, thermal overload, and ground fault conditions. The UR8FH's wide dynamic range captures both locked-rotor inrush currents and low-level ground fault leakage, providing comprehensive motor asset protection that extends equipment lifespan and reduces unplanned downtime.

Generator Synchronization & Protection
Combine with the GE 489 Generator Management Relay for automatic synchronization, reverse power detection, and loss-of-excitation protection. The UR8FH's high-speed sampling (up to 64 samples per cycle) ensures accurate phasor measurement for paralleling generators to the grid or operating in islanded microgrids.

Renewable Energy Integration
Support solar inverter and wind turbine protection schemes by monitoring AC output currents and voltages. The module's 50/60 Hz ±10% frequency tolerance accommodates grid frequency variations during weak-grid conditions or black-start scenarios.

Data Center & Mission-Critical Facilities
Deploy alongside the GE C30 Controller System for integrated power monitoring and building management system (BMS) integration. Real-time power quality data feeds predictive maintenance algorithms, alerting facility managers to deteriorating electrical conditions before equipment failures occur.

Technical Parameters & Selection Criteria

Selection Guidelines:

• For transformer differential protection, specify one UR8FH per winding set (e.g., two modules for a two-winding transformer)
• Feeder applications typically require one module per three-phase circuit plus neutral/ground
• Bus protection schemes may need multiple modules depending on the number of incoming/outgoing feeders
• Verify CT burden calculations to ensure secondary wiring resistance does not exceed module input impedance limits

Advanced Integration Features

IEC 61850 Sampled Values (SV)
When configured with the GE UR7DH Communications Module, the UR8FH can publish sampled analog values over Ethernet using IEC 61850-9-2 protocol. This enables process-bus architectures where conventional copper CT/VT wiring is replaced with fiber-optic networks, reducing installation costs in large substations.

Oscillography & Event Recording
The module continuously buffers analog waveforms, allowing the GE UR9AH CPU Module to capture pre-fault and post-fault data for forensic analysis. Oscillography files export in COMTRADE format for compatibility with third-party analysis tools like PSCAD and DIgSILENT PowerFactory.

Redundant Power Supply Compatibility
Pairs with the GE URRHH Power Supply Module for dual-redundant DC power distribution. If one supply fails, the UR8FH continues operating without interruption, ensuring continuous protection coverage.

Digital I/O Coordination
Analog measurements from the UR8FH trigger logic functions in the CPU, which then activate relay outputs on the GE UR6NH Digital I/O Module. This modular approach allows customized protection schemes without rewiring the entire panel.

Delivery Timeline & Service Commitments

Standard Lead Time: 3-5 business days for in-stock units
Custom Configuration: 7-10 business days for factory-programmed modules
Warranty Period: 12 months from shipment date
Technical Support: Email and phone support during business hours (GMT+8)
Documentation Included: Installation manual, wiring diagrams, UR Setup software license, COMTRADE viewer

All shipments include anti-static packaging and handling instructions. International orders are shipped via DHL/FedEx with full tracking and customs documentation support.

Frequently Asked Questions

What is the maximum CT secondary cable length for the UR8FH module?
For 5A CTs, up to 300 meters using 2.5mm² copper conductors is acceptable. For 1A CTs, distances up to 600 meters are feasible, provided total loop resistance remains below 4 ohms. Always calculate CT burden to verify compliance with CT accuracy class requirements.

Can I mix 1A and 5A current transformers on the same UR8FH module?
No. All CT inputs on a single UR8FH module must use the same secondary rating (either all 1A or all 5A). If your application requires mixed CT ratings, use separate UR8FH modules or consider the GE UR8AH CT/VT Module which offers independent channel configuration.

Does the UR8FH support Rogowski coil current sensors?
No. The UR8FH is designed for conventional iron-core current transformers with 1A or 5A secondaries. For Rogowski coil integration, consult GE Multilin for alternative input modules or signal conditioning interfaces.

How do I upgrade firmware on the UR8FH module?
The UR8FH does not contain user-upgradeable firmware. All signal processing firmware is embedded in the module's FPGA and cannot be modified in the field. Software configuration changes are made through the UR Setup application, which communicates with the UR9AH CPU Module, not the UR8FH directly.

What is the power consumption of the UR8FH module?
Typical power draw is 8-12 watts depending on the number of active input channels. When sizing the URRHH Power Supply Module, allocate 15 watts per UR8FH to ensure adequate margin for transient conditions.

Can the UR8FH be used in marine or offshore applications?
Yes. The module's conformal coating and extended temperature range make it suitable for shipboard electrical systems and offshore platforms. Ensure the enclosure meets IP54 or higher ingress protection ratings to prevent salt spray contamination. For DNV-GL or ABS certification requirements, contact our engineering team for compliance documentation.

Request a Quote or Technical Consultation

Our application engineers are available to assist with system design, CT/VT sizing, and protection scheme coordination. Whether you're retrofitting an existing substation or designing a greenfield project, we provide:

• Single-line diagram review and module quantity estimation
• CT burden calculations and secondary wiring specifications
• UR Setup software configuration templates
• On-site commissioning support (available in select regions)

Contact us today:
Email: sale@ninermas.com
Phone: +0086 187 5021 5667
Response time: Within 24 hours for technical inquiries

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