GE UR8LH

GE UR8LH

Product Introduction: The GE UR8LH is a CT/VT module designed for the GE Multilin UR (Universal Relay) series. It provides 4CT/4VT with enhanced diagnostics capability. The module can be used to replace a current module, upgrade an existing module, or add new capability to a universal relay that was not originally equipped with a given module. The enhanced diagnostics variant verifies analog signal integrity and ensures reliability through advanced algorithms.

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Category: SKU: GE UR8LH

Description

GE UR8LH

Technical Specifications:

  • Series: GE Multilin UR (Universal Relay)
  • Module Type: CT/VT module
  • Configuration: 4CT/4VT with enhanced diagnostics
  • CT Ratings: 1 A and 5 A
  • VT Ratings: Standard VT secondary voltages
  • Mounting: Plug-in module inside UR relay chassis
  • Firmware Compatibility: New module requires firmware version 4.0x or higher with a new CPU

Functional Features:

  • Provides 4CT and 4VT inputs for power system monitoring
  • Enhanced diagnostics capability verifies analog signal integrity using advanced algorithms
  • CT/VT transformers scale current and voltage values to levels the relay can process
  • Enables identification of hazardous voltage and current conditions for protective response
  • Data viewable via front-panel LCD or EnerVista UR software on a computer
  • Integrates with UR relay health diagnostics for continuous self-monitoring
  • Supports differential protection, concurrent split-phase protection, and other protection schemes

Application Scenarios:

  • Substation protection relays requiring input for overcurrent, differential, and voltage protection
  • Transformer differential protection with multiple CT inputs
  • Busbar protection requiring split-phase CT monitoring
  • Generator protection with voltage and current monitoring
  • Industrial power distribution protection

Performance Parameters:

  • Up to 24 analog signals (across module variants) for AC power line monitoring
  • Enhanced diagnostics verify signal integrity for reliable protection
  • Compatible with 1 A and 5 A CT secondary ratings
  • High-accuracy scaling of current and voltage for protection and metering

Material and Structural Characteristics:

  • Industrial-grade PCB with precision CT/VT input transformers
  • Plug-in module form factor matching UR relay chassis
  • Front-panel accessible through hinged relay front cover
  • Robust construction for substation and industrial environments

Working Principle: The transformers scale high-level current and voltage signals from the power system down to levels the relay electronics can process. The module’s enhanced diagnostics use advanced algorithms to verify that analog signals are operating normally, detecting faults such as open circuits, short circuits, or signal corruption. The scaled signals are digitized and transmitted to the UR relay CPU, which uses them for protection functions (overcurrent, differential, over/undervoltage) and metering. Data and diagnostic status are viewable on the front-panel LCD or via EnerVista UR software. Installation Requirements:

  • Open the hinged front panel of the UR relay to access the module rack
  • Insert the UR8LH module into the designated CT/VT slot
  • Connect CT and VT inputs to the rear terminal blocks per schematics
  • Configure ratios using EnerVista UR software
  • Verify firmware version 4.0x or higher is loaded with a compatible new CPU

Usage Notes:

  • As a new CT/VT module, pair UR8LH with a new CPU to avoid hardware mismatch errors
  • Ensure firmware version 4.0x or higher is installed for compatibility
  • Verify CT and VT ratio settings match the installed instrument transformers
  • Use EnerVista UR software to monitor diagnostic status and signal integrity
  • Periodically verify measurement accuracy using a relay test set

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