GE Multilin UR81H UR 81H Process Bus Module

Product Overview

The GE Multilin UR81H is a process bus module for the Universal Relay (UR) series. It accurately acquires analog signals from CTs and VTs or digital streams from IEC 61850 process bus networks. Therefore, it supports advanced protection, control, and metering applications in industrial and utility environments. Its modular, hot-swappable design ensures minimal downtime during maintenance or system upgrades.

Key Features & Benefits

• Provides precise CT/VT measurement for reliable protection and metering functions.

• Supports IEC 61850 Edition 2 digital substation integration with 8-port connectivity.

• Hot-swappable design allows maintenance without interrupting critical system operations.

• CyberSentry™ cybersecurity features align with NERC CIP standards for secure operation.

• IEEE 1588 time synchronization ensures accurate event recording and data logging.

• Modular architecture enhances system flexibility and simplifies future expansions.

• Supports redundant communication to improve overall substation reliability.

Technical Specifications

Signal Inputs:

• CT inputs: 1 A or 5 A secondary rating, configurable per system requirements

• VT inputs: Standard voltage measurement ranges

• Digital Input: IEC 61850 process bus streams (8-port module)

Communication & Protocols:

• IEC 61850 Edition 2

• PRP redundancy support

Cybersecurity & Time Sync:

• CyberSentry™ features for NERC CIP compliance

• IEEE 1588 precision time protocol

Construction & Physical Data:

• Modular, hot-swappable UR chassis design

• Weight: 0.6 kg

Typical Applications & System Integration

• Integration within the UR family for generator, transformer, motor, breaker, and feeder protection

• Analog signal acquisition from CTs/VTs for metering, protection, and automation

• Digital substation process bus integration for modern IEC 61850-based networks

• Ideal for industrial, utility, and high-reliability power system environments

FAQ

Q1: Can UR81H operate with both analog and digital signals simultaneously?
A1: UR81H supports either CT/VT analog inputs or IEC 61850 digital streams, depending on configuration.

Q2: Is the module hot-swappable in the UR chassis?
A2: Yes, UR81H features a modular, hot-swappable design for maintenance without downtime.

Q3: Does UR81H support cybersecurity standards?
A3: Yes, CyberSentry™ compliance aligns with NERC CIP for secure system operation.

Q4: Which protocols are supported for communication?
A4: The module supports IEC 61850 Edition 2 and PRP redundancy for reliable networking.