GE Multilin UR8FV | Universal Relay Series | CT/VT Measurement Module

Overview

The UR8FV CT/VT module from GE Multilin is a dedicated measurement interface designed for the UR Series Universal Relay platform. It integrates current and voltage sensing functions into a single hardware module, allowing the relay to acquire precise electrical parameters required for protection, metering, and system diagnostics in medium- and high-voltage power networks.

Engineered for substation-grade reliability, this module supports both phase and ground current measurement along with voltage inputs, ensuring accurate real-time data for protective algorithms and control logic.

Key Functions and Capabilities

The UR8FV module delivers combined current and voltage measurement through a compact design that minimizes wiring complexity and panel space. It supports standard secondary current ratings and voltage transformer connections commonly used in protection systems, enabling seamless integration with existing CTs and VTs.

The module is not a standalone device; it operates as part of the GE Multilin UR relay hardware architecture and communicates directly with the relay processor for protection, monitoring, and recording functions.

Technical Specifications

• Phase Current Inputs: Three phase CT channels, configurable for 1 A or 5 A nominal secondary

• Ground Current Input: One dedicated ground CT channel, configurable for 1 A or 5 A

• Voltage Inputs: Four-terminal VT input for phase or line voltage measurement

• Measurement Functions: RMS current and voltage measurement, phase and ground monitoring

• System Compatibility: GE Multilin UR Series Universal Relays

• Electrical Environment: AC power systems in substations and industrial power distribution

• Installation: Plug-in module for UR relay chassis

• Reliability Class: Designed for continuous operation in utility-grade environments

Applications

The UR8FV CT/VT module is commonly used in:

• Transmission and distribution substations

• Generator and transformer protection schemes

• Feeder protection and monitoring

• Industrial power systems requiring integrated current and voltage measurement

Installation and Engineering Notes

Correct CT polarity, VT wiring, and relay configuration are essential to ensure accurate measurements and dependable protection operation. Secondary current ratings must match relay settings to avoid scaling errors. Commissioning tests are recommended after installation.

FAQ

Is the UR8FV a complete protection relay?

No. The UR8FV is a measurement module that operates only when installed in a compatible GE Multilin UR Series relay.

Does the module support both 1 A and 5 A CTs?

Yes. The UR8FV supports standard 1 A and 5 A secondary CT inputs through configuration.

Can this module be used outside the UR Series platform?

No. It is specifically designed for electrical and mechanical compatibility with GE Multilin UR Series relays.