GE UR81H Process Bus Module | Multilin UR Series Communication

GE UR81H Process Bus Module – Product Description

Product Summary

The GE UR81H is a process bus module engineered for the GE Multilin UR relay family, supporting advanced protection and digital substation architectures. It captures analog CT/VT signals and delivers them to UR relays using IEC 61850 process bus communication. Moreover, the module helps utilities reduce wiring complexity by digitizing traditional instrument transformer connections. Its robust electrical design performs reliably in harsh substation environments and maintains stable operation across wide temperature ranges. In addition, the UR81H integrates seamlessly inside the UR chassis, ensuring consistent performance in mission-critical power systems.

Technical Data

Model: UR81H
Series: GE Multilin UR (Universal Relay)
Type: CT/VT Process Bus Module
Primary Function: Acquisition and digital transfer of analog CT/VT signals
Compatibility: All GE UR protection and control relays
Inputs: Up to 24 analog CT/VT channels
Communication Protocol: IEC 61850 process bus
Mounting: UR chassis, horizontal or vertical rack
Weight: 600 g
Operating Temperature: –40 °C to +70 °C
Storage Temperature: –40 °C to +85 °C
Country of Origin: USA

FAQ

Q1: What role does the UR81H play inside a UR relay system?
It converts analog CT/VT signals into digital data and sends them to UR relays via the IEC 61850 process bus.

Q2: Can the UR81H be used with any GE Multilin UR model?
Yes, it is compatible with the complete UR protection relay lineup.

Q3: Does the module improve system wiring efficiency?
Yes, it significantly reduces copper wiring by replacing point-to-point CT/VT connections with digital communication.

Q4: Is the UR81H suitable for high-temperature substations?
Yes, it operates reliably from –40 °C to +70 °C, making it suitable for demanding environments.

Q5: Does the module support redundant architectures?
Yes, it works within redundant communication networks used in modern utility substations.