GE UR-8FV
GE UR-8FV
GE UR-8FV
GE UR-8FV
GE UR-8FV

GE UR8GH | 4CT/4VT Sensitive Ground Fault Input Module – Field Service Notes

  • Model: UR8GH (also UR-8GH)
  • Alt. P/N: UR-8GH, UR 8GH
  • Product Series: GE Multilin UR Universal Relay Platform
  • Hardware Type: Slot-mounted 4CT/4VT analog input module
  • Key Feature: 10× higher ground fault sensitivity vs standard UR CT/VT modules
  • Primary Field Use: Captures low-level leakage currents for high-impedance ground fault protection
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Part number: UR8GH
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Description

Hard-Numbers: Technical Specifications

  • CT Inputs: 4 channels (3 phase + 1 ground), 1A/5A configurable
  • VT Inputs: 4 channels, up to 300VAC line-line
  • Accuracy: ±0.1% FS (precision metering grade)
  • Frequency: 45–65Hz (50/60Hz nominal, adaptive)
  • Isolation Rating: 2500Vrms between CT/VT and backplane
  • Operating Temperature: -40°C to +70°C continuous
  • Power Draw: 7.0W max, backplane-powered
  • Hot Swap: Live insertion/removal; auto-short on extract
  • Termination: Spring-clamp, 14–22 AWG
  • Dimensions: 4cm H × 18cm W × 15cm D
  • Weight: 1.36kg (3lb)
GE UR-8FV

GE UR-8FV

The Real-World Problem It Solves

Standard CT/VT modules miss low-magnitude ground faults in high-impedance systems. Undetected leakage leads to equipment damage and arc flash hazards.

Where you’ll typically find it:

  • Distribution substations (35–110kV) with high-resistance grounded systems
  • Power plant generator and unit auxiliary transformer protection racks
  • Industrial facilities (refineries, pulp mills) with ungrounded/high-impedance grids

Bottom line: It detects weak ground faults standard modules can’t, preventing unplanned outages and arc flash events.

 

Hardware Architecture & Under-the-Hood Logic

uses dedicated high-gain isolated analog front-ends (AFE) per channel, independent of the main relay CPU. All CT/VT circuits have reinforced galvanic isolation.

  1. CT (1/5A) and VT inputs feed to high-sensitivity isolated AFE stages.
  2. Precision burden resistors and low-noise op-amps scale low-level signals.
  3. 16-bit ADCs convert analog signals to high-resolution digital samples.
  4. Digital data crosses the isolated backplane to the host relay CPU.
  5. Per-channel diagnostics monitor saturation, wiring faults, and high-impedance paths.

 

Field Service Pitfalls: What Rookies Get Wrong

Ignoring CT Polarity for Sensitive GroundTechs reverse CT polarity on the ground input. Inverted signals cancel fault current, blinding protection.

  • Field Rule: Match CT polarity marks (H1/X1); verify with secondary injection test before energizing.

Over-Sizing VT Burden for High SensitivityAdding multiple devices to VT terminals loads the module. Voltage distortion kills low-level fault detection.

  • Quick Fix: Keep VT secondary load <30VA; use dedicated VT distribution blocks.

Misconfiguring Ground Fault ThresholdsSetting pickup too high negates 10× sensitivity. Low-level faults pass undetected.

  • Field Rule: Set ground pickup to 0.5–1.0% of CT nominal; coordinate with system grounding impedance.
GE UR-8FV

GE UR-8FV

Commercial Availability & Pricing Note

Please note: The listed price is for reference only and is not binding. Final pricing and terms are subject to negotiation based on current market conditions and availability.

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