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GE Multilin UR8GV UR-8GV CT/VT Input Module

Configured for CT and VT signal acquisition in GE Multilin Universal Relay platforms, the GE Multilin UR-8GV (UR-8GV CT/VT Input Module) provides direct physical/electrical execution for protective measurement, metering, and disturbance recording functions.

Hardware Specifications

Parameter	Specification
Model	UR-8GV
Brand	GE Multilin
Origin	Canada
Operating Temp	-40 deg C to +60 deg C
Power Consumption	Not specified in provided data
Module Type	Combined CT/VT AC Input Module
Frequency Input	50 Hz / 60 Hz auto-sensing and configurable
CT Inputs	1 A or 5 A nominal secondary current, selectable by order option
CT Thermal Withstand	20 A continuous, 500 A for 1 second
CT Burden	< 0.2 VA at rated current
VT Inputs	60 V to 240 V AC phase-to-neutral
VT Maximum Continuous Voltage	300 V AC
VT Burden	< 0.15 VA at 120 V
Sampling Rate	Up to 128 samples per cycle
Current Accuracy	+/- 0.25% of reading from 0.1 to 2.0 x IN
Voltage Accuracy	+/- 0.25% of reading from 10 V to 208 V
Frequency Accuracy	+/- 0.01 Hz
Storage Temp	-40 deg C to +85 deg C
Relative Humidity	Up to 95% non-condensing
Terminal Type	High-current screw-clamp and draw-out shorting block terminals

Deterministic Network and Protection Processing Characteristics

The UR-8GV module operates as an analog acquisition interface inside GE Multilin Universal Relay platforms. It converts CT and VT secondary signals into digitized measurement data used by relay protection algorithms, phasor calculations, oscillography, and power quality analysis.

The module provides CT shorting functionality during removal from the relay chassis to maintain a closed current transformer secondary circuit. The input design supports neutral current measurement, ground fault detection, zero-sequence protection schemes, and harmonic analysis up to the 25th harmonic.

The CT/VT channels are processed with relay internal sampling architecture for time-aligned protection calculations. The module interfaces with UR series protective relays including C60, T60, L90, D60, and B30 platforms.

Frequently Asked Questions

Q: Does the UR-8GV support hot-swap removal while CT circuits are connected?
A: The module includes an automatic CT shorting mechanism that shorts CT secondary circuits during module removal. Maintenance procedures must follow the relay manufacturer's installation instructions.

Q: What type of signals are processed by the UR-8GV module?
A: The module processes secondary current signals from CTs and secondary voltage signals from VTs for protection, metering, and recording functions.

Q: What terminal design is used for CT connections?
A: The module uses high-current screw-clamp and draw-out shorting block terminals designed for CT circuit safety during maintenance operations.

Field Installation Guidelines

Install the UR-8GV module only in compatible GE Multilin Universal Relay chassis slots. Verify chassis configuration, terminal assignments, and relay firmware compatibility before installation.

Connect CT wiring using the designated shorting terminal arrangement and maintain correct polarity between instrument transformers and relay inputs. Keep CT and VT signal wiring separated from high-current power conductors to reduce induced electrical noise.

Use shielded signal cables where required by the installation design. Connect cable shields according to site grounding practices and avoid multiple unintended grounding paths.

Confirm that VT secondary voltage levels match the configured relay input range before energizing the module. Inspect terminal tightness, connector engagement, and module seating position after installation.

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