GE Multilin UR8HH CT/VT Input Module

The GE Multilin UR8HH is a dedicated CT/VT interface module developed for the UR series universal protection relays. It collects current and voltage signals from instrument transformers, converts high primary electrical signals into low-level signals that the relay can process accurately for power system measurement and protection logic.

This plug-in module adopts integrated signal conditioning and isolation circuits. It supports phase CT and ground CT inputs, ensuring stable signal transmission under complex electromagnetic interference environments, and is widely used for upgrading and spare part replacement of power protection control cabinets.

Main Specifications

Brand: GE Multilin (General Electric)
Model: UR8HH
Applicable Series: UR Universal Relay Platform
Signal Type: CT / VT Current & Voltage Transformer Input
Phase CT Rating: 1A / 5A
Ground CT Rating: 1A / 5A
Operating Temperature: -40°C ~ +70°C
Installation: Hot-pluggable module for UR relay chassis
Communication: Interconnected with main CPU via internal backplane
Approximate Weight: 1.16 kg

Core Functions

Receive analog signals from power system CT and VT instrument transformers
Signal filtering, isolation and conditioning for high-precision sampling
Transmit processed electrical data to UR relay main control unit
Support phase current measurement and ground fault current monitoring
Provide raw data for overcurrent, earth fault and voltage protection functions
Built-in circuit protection against surge and transient interference
Module status detection and fault diagnosis feedback
Compatible with EnerVista UR configuration software
Support hot swap for convenient maintenance without system shutdown
Realize reliable signal isolation between primary circuit and relay internal circuit