GE Multilin UR7DH Inter-Relay Communications Module | UR Series Protection

Product Description

Overview

The GE UR7DH is an advanced inter-relay communications module designed for GE’s Universal Relay (UR) series. It delivers high-speed, reliable data transfer between relays to enable precise coordination in transmission line protection and substation automation. Engineered for utility and industrial power systems, it supports critical communication-aided schemes for fault detection and isolation.

Key Technical Features

Protection and Control

• Supports directional comparison blocking (DCB) and unblocking (DCU) pilot schemes

• Sub-cycle tripping with response times typically under 16 ms for transient stability

• Five independent distance protection zones with mho or quadrilateral characteristics

• Integrated Digital Fault Recording (DFR) and Sequence of Events (SOE) logging

Communications

• Single-mode 1300 nm fiber optic channel with optional direct relay-to-relay connections

• Fully compliant with IEC 61850 Edition 2, supporting seamless substation integration

• Supports PRP (Parallel Redundancy Protocol) and HSR (High-availability Seamless Redundancy)

• DNP 3.0, Modbus TCP/IP, and IEC 60870-5-104 compatible

Monitoring and Diagnostics

• Continuous self-health diagnostics of internal hardware and communication integrity

• Integrated Phasor Measurement Unit (PMU) compatible with IEEE C37.118

• Channel health monitoring for real-time fault detection

Hardware and Environmental

• Powered through the connected relay unit

• Operating range: -40°C to +70°C (-40°F to +158°F)

• Dimensions: 6 × 7 × 1.5 inches; Weight: 0.77 kg

• Modular design allows field upgrades and easy maintenance

• High EMC immunity suitable for substation environments

Technical Summary Table

Applications

Ideal for high-voltage transmission line protection and coordination, substation automation, and wide-area monitoring in industrial and utility networks. Compatible with UR series relays for pilot-aided schemes like POTT, DCB, and DUTT.

FAQ

Q: Can UR7DH integrate with other UR series relays?
A: Yes, it supports seamless inter-relay communication with any GE UR relay.

Q: Does it provide real-time diagnostics?
A: Yes, the unit continuously monitors channel health, hardware status, and communication integrity.

Q: What is the typical response time for protection tripping?
A: Sub-cycle response, typically under 16 ms.