GE Multilin UR8FV CT/VT Measurement Module

The GE Multilin UR8FV is a hot‑swappable plug‑in CT/VT analog measurement module for GE Multilin UR‑series universal protection relays. It receives secondary current and voltage signals from current transformers and voltage transformers, converts raw field signals into precise digital measurement data, and feeds data to the main relay CPU for protection algorithms, metering and power‑system fault monitoring in substation automation systems.

This module connects directly to UR‑series relay chassis backplane bus, featuring high‑precision signal conversion and galvanic isolation to suppress substation electromagnetic interference. It supports hardware channel diagnostics and works with EnerVista UR configuration software. Original production has been discontinued. It is widely supplied as aftermarket spare parts for utility substation, petrochemical power‑room protection cabinet maintenance and protection‑system upgrade projects.

Main Specifications

1. Brand:GE; Model:UR8FV; Type:Multilin UR‑Series CT/VT Measurement Module
2. Input Configuration:3 phase CT inputs (1A/5A), 1 ground CT input (1A/5A), 1 four‑terminal VT input
3. VT Rated Range:115V, 230V, 460V, 575V for different power‑system voltage levels
4. Measurement Accuracy:Current ±0.5% FS, Voltage ±0.2% FS, frequency range 45‑65Hz
5. Bus Interface:Direct plug‑in connection to UR‑series relay internal backplane bus
6. Diagnostic Feature:Per‑channel self‑diagnosis, LED status indicators for measurement channel status
7. Supply Status:Original production discontinued, available as tested surplus or refurbished spare parts

Core Functions

1. Acquire secondary analog signals from field CT and VT sensors, complete signal conditioning and high‑precision conversion for power‑system current and voltage parameters.
2. Transmit accurate measurement data to UR main relay CPU to support differential protection, overcurrent protection, metering and disturbance‑recording functions.
3. Provide galvanic isolation between high‑energy field transformer circuits and internal relay circuits to resist surge and electromagnetic interference inside substation cabinets.
4. Support hot‑swap installation within compatible UR chassis to shorten equipment downtime during module maintenance and replacement work.
5. Detect measurement channel anomalies and hardware faults, upload diagnostic information to main relay and display running status via on‑board LED indicator lights.
6. Serve as critical analog signal acquisition hardware for GE Multilin UR‑series protection and control relays inside power‑utility and heavy‑industry substation cabinets.

Application Scenarios

1. Power‑utility substations, petrochemical plants, metallurgical enterprises and other sites equipped with UR‑series protection relays for medium‑high‑voltage power equipment.
2. Spare CT/VT measurement module replacement and routine maintenance of existing GE Multilin UR‑family protection‑control cabinets.
3. Technical renovation and measurement‑accuracy upgrade of aging substation protection‑control automation systems.
4. On‑site troubleshooting and replacement of faulty measurement modules on continuously operating power‑supply protection units.
5. Spare‑parts stocking for system integrators and power‑system professional maintenance contractors.
6. Global aftermarket spare supply for technicians maintaining obsolete GE Multilin UR‑series legacy protection hardware.

FAQ

1. Q:Can UR8FV work as a standalone device?
   A:It is an analog measurement expansion module, must be installed inside matched Multilin UR relay chassis and cannot operate independently.
2. Q:What happens when UR8FV module fails?
   A:Loss of current‑voltage measurement data, protection function invalidation, system fault alarm and protection mis‑operation risk may occur.

3. Q:What configuration software applies to UR8FV?
   A:It is configured and diagnosed via GE EnerVista UR setup software together with the host UR‑series protection relay.