GE UR7KH | Single-Mode Fiber Communication Module for UR Relays – Field Service Notes
GE UR7KH | Single-Mode Fiber Communication Module for UR Relays – Field Service Notes - Image 2
GE UR7KH | Single-Mode Fiber Communication Module for UR Relays – Field Service Notes - Image 3
GE UR7KH | Single-Mode Fiber Communication Module for UR Relays – Field Service Notes - Image 4
GE UR7KH | Single-Mode Fiber Communication Module for UR Relays – Field Service Notes - Image 5

GE UR7KH | Single-Mode Fiber Communication Module for UR Relays – Field Service Notes

  • Model: UR7KH
  • Alt. P/N: UR-7KH
  • Product Series: GE Multilin UR Universal Relay Platform
  • Hardware Type: Slot-mounted single-mode fiber communication expansion module
  • Key Feature: Dual 1300nm single-mode laser ports for long-distance inter-relay data transfer
  • Primary Field Use: Establishes low-attenuation fiber links for relay sync, GOOSE messaging, and wide-area substation coordination

 

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Description

Hard-Numbers: Technical Specifications

  • Fiber Port Count: 2 × single-mode ST fiber connectors
  • Optical Wavelength: 1300nm infrared single-mode laser
  • Max Fiber Distance: 20 kilometer with 9/125μm single-mode cable
  • Data Transfer Rate: 100Mbps fiber throughput, high-speed UR backplane interface
  • Supported Protocols: UR proprietary inter-relay protocol, GOOSE, IEC 61850, Modbus TCP/IP
  • Operating Temperature: -40°C to +70°C continuous cabinet operation
  • Isolation Rating: 2500Vrms galvanic isolation between fiber circuits and backplane
  • Power Draw: 4.5W maximum, powered entirely from UR chassis backplane
  • Hot Swap Rating: Live insertion/removal capable for in-service maintenance
  • Heat Dissipation: Passive convection cooling, no onboard fans

The Real-World Problem It Solves

Multimode fiber and copper links fail at long substation distances. High attenuation and EMI cause link drops, sync loss, and delayed trip logic over wide-area networks.

Where you’ll typically find it:

  • Large transmission substations with 5–15km inter-bay fiber runs
  • Regional power plant protection racks linking remote switchgear yards
  • Industrial refineries with distributed process control across wide sites

Bottom line: It extends reliable relay communication to 20km and eliminates distance-related signal loss in long-haul substation layouts.

 

Hardware Architecture & Under-the-Hood Logic

uses a dedicated onboard communication processor independent of the main relay CPU. All single-mode transceivers have full galvanic isolation to block high-voltage transients.

  1. Incoming single-mode fiber signals convert to digital logic via 1300nm laser transceivers.
  2. Local processor validates frames, filters noise, and buffers outbound messages.
  3. Processed data transfers across the high-speed UR backplane to the host relay.
  4. Trip logic, timing sync, and GOOSE commands package for transmission to remote UR fiber modules.
  5. Onboard diagnostics monitor optical power, link health, and transceiver faults continuously.

Field Service Pitfalls: What Rookies Get Wrong

Mismatched Fiber Cable TypesTechs plug multimode fiber into ports. High attenuation causes weak signals, constant link flapping, and unlogged communication errors.

  • Field Rule: Only 9/125μm single-mode fiber is approved; multimode cable will not work reliably.

Poor Fiber Termination & ContaminationDust, oil, or scratches on ST connector ends reduce light transmission. Degraded links trigger slow GOOSE response and delayed interlocks over long distances.

  • Quick Fix: Clean termini with alcohol wipes before mating; inspect with a fiber scope and polish if damaged.

Inadequate Cabinet CoolingStacked modules with no side airflow raise internal temps. Sustained heat shortens transceiver life and causes intermittent optical faults in high-temperature environments.

  • Field Rule: Maintain 20mm side clearance between slot cards; keep cabinet intake filters clear of dust.

 

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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