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

Application Scenarios

• Substation medium voltage feeder protection relay systems
• Power plant generator and auxiliary motor protection cabinets
• Oil & gas industry power distribution monitoring and protection
• Metallurgical factory medium voltage power supply control system
• Water treatment plant power distribution protection equipment
• Wind farm and photovoltaic power station relay protection devices
• Mine power distribution network fault monitoring and protection
• Industrial factory medium voltage switchgear control cabinets
• Legacy GE UR protection system renovation and spare parts replacement
• Building large-scale power distribution automation monitoring system