Description
The GE UR8FH is a specialized Current Transformer / Voltage Transformer (CT/VT) input module designed for the GE Multilin Universal Relay (UR) series (including the B30, C60, D60, G60, L90, and M60 relays). It serves as the primary interface that scales down high field voltages and currents into low-level signals that the relay’s processor can safely monitor.
Technical Specifications
- Model Number: UR8FH (or UR-8FH)
- Series: Multilin Universal Relay (UR)
- Product Type: Standard CT/VT Module
- Input Channels: 8 total channels, typically configured as:
- 3x Phase CTs: 1A/5A dual-rated for phase current measurements.
- 1x Ground CT: 1A/5A dual-rated for ground current monitoring.
- 4x VT Terminals: For voltage scaling and monitoring.
- Accuracy: High-precision class (supports up to 0.2S for measurement).
- Response Time: Ultra-fast (<12ms response for critical faults).
- Mounting: Hot-swappable plug-in module for the UR-series chassis.
- Weight: Approximately 1.16 kg (2 lb 9 oz).
GE UR8FH
GE UR8FH
GE UR8FH
Key Features
- Galvanic Isolation: High-level insulation between field wiring and internal relay logic for maximum protection.
- Hot-Swappable Design: Allows for maintenance or module replacement without powering down the entire relay chassis (when used in a redundant setup).
- High Sensitivity: Accurate sensing even at low current levels, critical for detecting minor leakage or early-stage faults.
- FlexLogic™ Integration: Signals from the UR8FH are directly available to the relay’s internal programming (FlexLogic) for customized protection schemes.
Application Fields
The UR8FH is used in high-integrity protection and control environments:
- Transformer Protection: Interfacing with CTs on both high and low voltage sides to detect differential faults.
- Busbar Protection: Providing current sum data for bus differential protection.
- Motor Protection: Detecting mechanical jams, phase faults, and thermal overloads.
- Feeder Protection: Monitoring directional overcurrent and earth faults in distribution networks.
- Utility Substations: Acting as the high-accuracy measurement front-end for grid-level monitoring.
Usage & Installation Tips
- Terminal Matching: Always ensure the relay terminal connections match the secondary rating (1A or 5A) of your field CTs. Incorrect matching can lead to system damage or protection failure.
- Channel Grouping: Channels are typically grouped (e.g., Channels 1–4 and 5–8). Common practice places Phase A on channels 1 and 5, Phase B on 2 and 6, etc., to ensure proper vector calculation within the relay.
- Firmware Sync: After replacing a module, verify the relay’s firmware version. UR modules sometimes require a firmware update to be correctly recognized by the main CPU module.
- Grounding: Ensure the ground CT (Channel 4) is properly connected to the system neutral or residual ground path to enable sensitive ground fault protection.
Similar Model Recommendations
- GE UR-8G: Advanced CT/VT module with additional sensitive ground fault support.
- GE UR-8M: Transducer I/O module for 4-20mA signals.
- GE UR-8L: Digital I/O module for contact sensing and breaker control.
- GE UR-8N: High-density contact input module.
For technical support or to procure the GE UR8FH, please contact our protection relay specialists.
