GE UR8LH  Multilin UR

The GE UR8LH is a protective relay module from GE’s Multilin UR Series, designed for high-voltage electrical protection applications. Here’s a detailed breakdown:

1. Product Overview

• Model: UR8LH
• Manufacturer: GE Renewable Energy (formerly Alstom Grid, now part of GE’s Grid Solutions business).
• Series: Multilin UR (Universal Relay) – A family of advanced protection, control, and monitoring relays for power systems.
• Type: Line protection relay, typically used for high-voltage transmission lines (e.g., 69 kV to 500 kV and above).

2. Key Features

• Protection Functions:
  • Overcurrent (50/51)
  • Distance protection (21)
  • Directional overcurrent (67)
  • Pilot protection (differential, permissive/blocking schemes)
  • Voltage and frequency protection
  • Breaker failure protection
  • Auto-reclosure coordination
• Communication:
  • Supports IEC 61850, DNP3, Modbus, and other protocols for SCADA integration.
  • Ethernet, serial, and fiber-optic communication options.
• Human-Machine Interface (HMI):
  • Front-panel LCD display for local monitoring and configuration.
  • Pushbuttons for navigation and control.
• Flexibility:
  • Modular design allows customization for specific applications.
  • Supports multiple I/O configurations (digital/analog inputs/outputs).

3. Applications

• Transmission Lines: Primary and backup protection for overhead and underground lines.
• Substations: Used in HV/EHV substations for line bay protection.
• Industrial Power Systems: Protection in large industrial facilities with high-voltage distribution.

4. Technical Specifications

• Voltage Rating: Typically supports high-voltage systems (e.g., 69 kV to 500 kV).
• Current Input: Supports CT secondary currents (e.g., 1A or 5A).
• Power Supply: Dual redundant power inputs for reliability.
• Environmental Rating: Meets IEC 60255 standards for temperature, humidity, and vibration.

5. Comparison with Other UR Models

• UR8LH vs. UR6LH: The UR8LH is designed for higher-voltage applications compared to the UR6LH (which may target medium-voltage systems).
• UR8LH vs. UR8B: The UR8B focuses on busbar protection, while the UR8LH is line-oriented.

6. Documentation & Support

• Manuals: Refer to GE’s official documentation for detailed setup, configuration, and troubleshooting.
• Training: GE offers training courses for engineers on UR series relay programming and operation.
• Software: Use GE’s EnerVista software for relay configuration, firmware updates, and event analysis.

7. Where to Buy/Service

• Distributors: Contact authorized GE Grid Solutions distributors or resellers.
• Service: GE provides global support for calibration, repairs, and technical assistance.

If you need specific technical details (e.g., wiring diagrams, setting examples, or firmware versions), consult the GE UR8LH Technical Manual or reach out to GE’s technical support team.

Would you like information on a particular aspect (e.g., configuration steps, fault analysis, or alternatives)?