GE Multilin UR7DH UR-7DH Inter-Relay Communications Module The GE Multilin UR7DH, also cataloged as the UR7DH Inter-Relay Communications Module, operates as a dedicated...
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GE Multilin UR7DH UR-7DH Inter-Relay Communications Module
The GE Multilin UR7DH, also cataloged as the UR7DH Inter-Relay Communications Module, operates as a dedicated hardware component for high-speed optical data exchange between GE Multilin Universal Relay devices using direct fiber communication links.
Hardware Specifications
Parameter
Specification
Model
GE Multilin UR7DH
Brand
General Electric Multilin (GE)
Module Type
Inter-Relay Communications Module (COMMS 7D)
Origin
Markham, Ontario, Canada
Weight
1.2 kg
Dimensions
6 in L x 7 in W x 1.5 in H
Operating Temp
-40 deg C to +70 deg C
Power Consumption
Module power supplied through UR chassis backplane
Platform Compatibility
GE Multilin Universal Relay (UR) Series
Communication Interface
Direct fiber serial link
Optical Source
1300 nm single-mode laser
Channel Count
1 channel
Fiber Type
Single-mode fiber (SMF)
Communication Protocol
GE Multilin Direct High-Speed Inter-Relay Protocol
Form Factor
UR chassis slot insertable module
Profinet / EtherNet-IP Deterministic Networks and Backplane Integration
The UR7DH module integrates with the GE Multilin Universal Relay architecture through the UR chassis backplane interface. The module provides deterministic peer-to-peer communication without external protocol converters, supporting protection schemes requiring direct relay-to-relay signal exchange.
The optical interface uses a 1300 nm single-mode laser transmitter for low attenuation fiber links. The fiber serial connection provides electromagnetic interference resistance and maintains signal integrity in substation environments.
Frequently Asked Questions
Q: What communication medium is supported by the GE Multilin UR7DH? A: The module uses single-mode fiber (SMF) with a 1300 nm optical laser interface for direct high-speed inter-relay communication.
Q: Can the UR7DH operate as a standalone communication device? A: No. The UR7DH is designed as a UR chassis slot insertable module and requires installation within a compatible GE Multilin Universal Relay platform.
Q: What protection applications use the UR7DH communication link? A: The module supports relay communication schemes including line current differential protection, direct transfer tripping (DTT), permissive overreaching transfer trip (POTT), and inter-relay interlocking.
Field Installation Guidelines
Install the UR7DH module only in a compatible GE Multilin Universal Relay chassis slot.
Verify chassis power removal before module insertion or removal to prevent electrical damage.
Route fiber optic cables separately from high-voltage conductors and high-current wiring to reduce mechanical stress and accidental fiber damage.
Maintain proper fiber bend radius according to the installed cable specification.
Use appropriate fiber cleaning procedures before connecting optical interfaces.
Bond and ground the relay enclosure according to substation protection panel grounding practices.
Confirm communication link status after installation using relay configuration and diagnostic functions.
