GE UR6DH
GE UR6DH
GE UR6DH
GE UR6DH
GE UR6DH

GE UR-77H | Multilin UR Inter-Relay Communication Module – Field Notes

  • Model: UR-77H (UR77H)
  • Alt. P/N: UR77H, UR‑77‑H
  • Product Series: GE Multilin UR Platform
  • Hardware Type: Inter‑relay high‑speed communication module
  • Key Feature: Dual‑port fiber/electrical, IEC 61850, DNP3, Modbus support
  • Primary Field Use: Links UR relays in substation; enables peer‑to‑peer protection and SCADA integration
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Part number: UR-77H
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Description

Hard-Numbers: Technical Specifications

  • Communication Ports: 2 × (Fiber SC/ST + Electrical Ethernet 10/100Base‑T)
  • Protocols: IEC 61850 (MMS/GOOSE), DNP3, Modbus TCP/IP, IEC 60870‑5‑103
  • Data Rate: 10/100 Mbps auto‑negotiate
  • Backplane Interface: UR high‑speed backplane, 2 Gbps throughput
  • Isolation Rating: 2500Vrms field‑to‑backplane
  • Operating Temperature: -40°C to +70°C continuous
  • Power Draw: 4.8W max, backplane powered
  • Form Factor: Standard UR slot, hot‑swap capable
  • Redundancy: Supports PRP/HSR for seamless redundant networks
GE UR6DH

GE UR6DH

The Real-World Problem It Solves

Substations with multiple UR relays need fast, reliable peer‑to‑peer links. Hardwired I/O is slow, bulky, and prone to noise; legacy serial links lack bandwidth for modern protection.

Where you’ll typically find it:

  • Transmission substations with 5–20 UR relays (line, transformer, bus protection)
  • Smart grid IEC 61850 process bus and station bus networks
  • Combined‑cycle plants integrating generator, switchgear, and balance‑of‑plant relays

Bottom line: It replaces hundreds of control wires with a single fiber link, cutting wiring time by 70% and enabling GOOSE‑speed tripping.

 

Hardware Architecture & Under-the-Hood Logic

UR-77H has a dedicated 32-bit communication processor, independent of the relay’s main CPU. All external ports are galvanically isolated from the backplane.

  1. Fiber/copper ports receive Ethernet frames; PHY chips handle encoding/decoding.
  2. Onboard processor filters, prioritizes, and routes messages (GOOSE, MMS, DNP3).
  3. High‑speed backplane interface exchanges data with local UR relay CPU.
  4. Peer‑to‑peer GOOSE messages broadcast to other UR77H modules in the substation.
  5. Redundancy logic (PRP/HSR) auto‑switches paths if a fiber or port fails.

 

Field Service Pitfalls: What Rookies Get Wrong

Mismatched Fiber TypesNew techs mix multi‑mode and single‑mode fiber; link stays down or drops packets under load.

  • Field Rule: Use 62.5/125 μm multi‑mode (for <2 km) or 9/125 μm single‑mode (for >2 km); never splice different types.

Ignoring Port IsolationTechs connect unisolated switches directly to UR-77H electrical ports. Ground loops cause corruption and random relay resets.

  • Field Rule: Always use isolated Ethernet switches between UR77H and non‑isolated SCADA networks.

Overloading GOOSE TrafficRookies enable too many GOOSE datasets; latency spikes, and trips get delayed.

  • Quick Fix: Limit each to 20–30 GOOSE messages; prioritize trip/interlock over non‑critical data.
GE UR6DH

GE UR6DH

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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