GE UR8GH CT/VT Ground Protection Module

Product Overview

The GE UR8GH is a high-performance CT/VT Ground Protection Module designed specifically for the GE Multilin Universal Relay (UR) family. This module is engineered to bridge the gap between primary high-voltage equipment and the relay's digital logic by converting signals from Current Transformers (CT) and Voltage Transformers (VT) into precise digital data. 

Technical Specifications

• Module Type: Sensitive Ground CT/VT Protection

• Manufacturer: GE Multilin

• Operating Voltage: 220 V AC

• Memory Capacity: 2 MB Program / 1 MB Data

• Operating Temperature: -40 °C to +70 °C

• Interfaces: RS232 (Standard), Ethernet (Optional)

• Processing Speed: 15 Hz

• Analog Inputs: Supports 4-20 mA process variable monitoring

• Safety Feature: Automatic CT shorting on removal

Key Features and Engineering Advantages

• Ultra-Sensitive Ground Detection: Engineered to detect minute ground leakage currents that standard modules might miss, providing a superior layer of protection for expensive windings in generators and large motors.

• Integrated Safety Shorting: To protect personnel and equipment, the UR8GH includes a mechanical safety feature that automatically short-circuits the CT secondary circuit when the module is withdrawn from the chassis, preventing hazardous high-voltage transients.

• Hybrid Analog Input Support: Beyond traditional power monitoring, the module can accept 4-20 mA inputs. This allows engineers to integrate process variables—such as transformer oil temperature or water levels—directly into the relay's protection logic.

• Advanced Signal Diagnostics: The module continuously monitors the integrity of the CT/VT wiring. If a signal discrepancy or open circuit is detected, it triggers an immediate alert via the EnerVista UR software or the relay's local display.

• Scalable Modular Design: The UR8GH is fully compatible with the broader UR-series architecture, allowing it to be used in conjunction with other I/O and communication modules to create a customized protection profile (e.g., in a G60, B30, or T60 relay).