Description
GE Multilin UR8FH CT/VT Module
The GE Multilin UR8FH is a high-performance analog input module designed for the Universal Relay (UR) family. It specifically functions as a CT/VT (Current Transformer/Voltage Transformer) interface, converting high-level primary signals from the power system into digital data for the relay’s processor.
Product Introduction
The UR8FH CT/VT Module is an essential component for power system protection and metering. It provides the high-accuracy sensing required for complex protection functions such as distance, differential, and directional overcurrent. The GE Multilin UR8FH is built with advanced galvanic isolation to protect the relay’s internal circuitry from power system transients and surges.
GE MULTLIN UR8FH
Technical Specifications (Datasheet)
The UR8FH module provides 8 analog input channels, typically configured for a mix of current and voltage sensing.
| Parameter | Specification |
| Number of Channels | 8 Channels (Total) |
| Configuration Type | 4 Current (CT) + 4 Voltage (VT) |
| Current Input Rating | 1 A / 5 A (Software selectable or hardware fixed) |
| Voltage Input Rating | 0 to 300 V AC |
| Frequency Range | 50 Hz / 60 Hz (Adaptive tracking) |
| Accuracy | \pm 0.1\% of Reading (0.1 to 2.0 x Nominal) |
| A/D Conversion | 64 samples per cycle |
| Isolation | 2 kV AC for 1 minute |
| Country of Origin | USA / Canada |
Technical Description & Usage
The UR8FH module resides in the I/O slots of a UR chassis (such as the L90, G60, or B30). It is responsible for the rapid sampling of waveforms used in FlexLogic™ calculations.
- Signal Conversion: It transforms high-current and high-voltage secondary signals into low-voltage signals for digital signal processing (DSP).
- Sampling: The module performs high-speed sampling, which is critical for accurate phasor estimation and harmonic analysis.
- Calibration: Each module is factory-calibrated to ensure consistent performance across its entire operating temperature range.
- Redundancy: In high-availability configurations, multiple UR8FH modules can be used to provide redundant sensing paths for critical protection zones.
Application Fields
- Transmission Line Protection: Providing inputs for distance and line differential functions.
- Generator Monitoring: Sensing stator current and voltage for out-of-step and loss-of-excitation protection.
- Busbar Protection: Collecting high-accuracy current data for bus differential schemes.
- Power Quality Analysis: Capturing waveform data for total harmonic distortion (THD) and voltage sag/swell monitoring.
Recommended Similar Models
For different CT/VT configurations or expanded I/O needs within the GE Multilin UR series, consider the following modules:
- UR8G: A CT/VT module with 8 Current (CT) inputs for high-density current monitoring.
- UR8L: A CT/VT module featuring sensitive ground current inputs for high-impedance grounding systems.
- UR8M: A specialized module optimized for high-speed bus protection applications.
- UR8J: A voltage-only interface module providing 8 VT inputs for bus voltage monitoring.
- UR8N: A hybrid module designed for specific distribution automation tasks.
Would you like me to provide the specific wiring terminal pinouts for the UR8FH current and voltage inputs?
