GE UR8FH CT/VT Input Module

Technical Specifications

Model: UR8FH

Brand: GE Multilin (GE Vernova)

Product Type: CT/VT signal acquisition input module

Applicable System: GE Multilin UR‑series universal relay chassis, compatible with T60, G60, B90, C60 etc. main CPU units

Phase CT Input: 3‑channel phase current, support 1A /5A secondary CT input

Ground CT Input: 1‑channel ground fault current, support 1A /5A secondary CT input

VT Voltage Input: 4‑channel voltage transformer secondary input (4‑VT)

CT Burden: ＜0.2VA @5A, ＜0.08VA @1A

VT Burden: ＜0.025VA per channel

Sampling Precision: High‑speed ADC sampling, meets IEC protection‑class accuracy requirement

Backplane Interface: UR‑series chassis high‑speed backplane connector, hot‑swap plug‑in structure

Installation Mode: Plug‑in slot installation inside UR relay chassis

Operating Temperature:‑40℃ ~ +70℃, non‑condensing

Humidity:5%‑95% non‑condensing

Weight:0.82kg

Dimension:142mm ×124mm ×62mm

Application: Power‑plant main‑transformer protection, substation bus‑bar & feeder protection, generator protection, industrial high‑voltage power‑system UR‑relay signal acquisition.

Product Function Description

UR8FH is the dedicated CT/VT acquisition expansion module for GE Multilin UR series universal relay platform。

This module directly connects to on‑site current transformer and voltage transformer secondary circuits, completes high‑precision sampling of three‑phase phase current, ground fault current and multi‑group AC voltage signals, and transmits the sampled raw data to UR main CPU through chassis backplane bus. It provides the basic analog‑signal source for differential protection, overcurrent protection, impedance protection, power‑measurement and power‑quality monitoring functions of UR‑series relays。

The module adopts plug‑in hot‑swap design, convenient for on‑site replacement and maintenance without modifying external CT/VT secondary wiring. It has built‑in over‑voltage and surge‑suppression protection, which can resist the interference of transient surges in power‑system secondary‑loop. It is widely matched with T60 transformer relay, G60 generator relay, B90 bus‑bar relay and other core UR‑series protection devices in power‑plant and substation sites。

It supports multi‑range CT secondary setting (1A/5A), users can configure CT rated value through relay software according to on‑site transformer parameters, no need to change hardware. The module cooperates with UR main‑frame to realize complete protection, measurement, recording and communication functions of power equipment.

Product Details

Standard plug‑in board‑type module for UR‑series chassis, metal housing, industrial‑grade anti‑interference hardware design, adapts to complex substation and power‑plant electromagnetic‑interference environment. This legacy module has been discontinued by original manufacturer, mainly used for old‑equipment overhaul and spare‑part replacement. Please confirm chassis slot position, CT secondary rating and main‑unit firmware version before commissioning. Strict ESD protection shall be adopted during installation.