Description
⚙️ Product Specifications
- Brand: GE Multilin
- Model: UR8HH (UR-8HH)
- Series: Universal Relay (UR) Series
- Product Name: Current Transformer / Voltage Transformer (CT/VT) Input Module
- Origin: USA / Canada
- Status State: Active / Refurbished
- Dimensions: Standard UR modular rack-mount format (approx. 7″ x 6″ x 2″ / 6 \times 19.5 \times 17.2 cm)
- Weight: Approx. 1.16 kg (2.55 lbs)
- Country of Origin: USA / Canada
- Power Rating: Low Voltage Backplane Powered / Signal Conditioned
📖 Operation Guidelines & Usage Instructions
The GE Multilin UR8HH is a high-accuracy Current and Voltage Transformer (CT/VT) module designed for integration within the Universal Relay (UR) protection and automation platform. It provides precise signal conditioning, isolation, and scaling of high-voltage and high-current inputs down to levels readable by the relay CPU. Ensure all rack power and external primary substation/switchgear feeds are completely isolated, locked out, and tagged before handling, inserting, or removing the module. Follow strict electrostatic discharge (ESD) safety protocols and secure the module firmly inside the designated relay bay. Routine maintenance includes verifying terminal screw torque, checking wiring insulation, and reviewing channel calibration via EnerVista UR software.
⚡ Power-Up / Power-Down Sequence
- Power-Up Sequence: Verify that the UR8HH module is properly aligned and securely plugged into the UR system backplane slot and that all CT/VT secondary wiring is correctly terminated. Switch on the main control power distribution unit supplying the relay rack. Observe the front-panel display and diagnostic LEDs to confirm proper module recognition and initialization.
- Power-Down Sequence: Disable active trip outputs or block protection schemes via the EnerVista software interface if necessary to prevent false tripping. Turn off the main power supply to the UR system rack, ensure external CT/VT circuits are safely shorted/isolated where required by safety standards, allow internal circuits to fully discharge, and carefully extract the module.
❓ Frequently Asked Questions (Q&A)
- Q: What is the primary purpose of the UR8HH module?
A: It provides the relay with phase and ground current transformer (CT) inputs (supporting 1A/5A ratings) and voltage transformer (VT) inputs, allowing the system to accurately monitor, meter, and protect electrical power networks.
- Q: Can this UR series module be hot-swapped while the system is energized?
A: No, live-insertion or hot-swapping CT/VT modules is strictly discouraged. Opening secondary CT circuits under load can generate dangerous high voltages and damage equipment; always de-energize and isolate the system first.
🚀 Recommended GE Multilin Models
- UR6BH
- UR6EH
- UR8AD
- F60 Feeder Protection System
- D60 Line Distance Protection System
- T60 Transformer Protection System
- M60 Motor Protection System
- C60 Breaker Management Relay
- B30 Busbar Protection System
- EnerVista UR Series Hub
