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The GE UR8AH is a CT/VT Input Module (Current Transformer / Voltage Transformer Module) designed for the GE Multilin UR Series Universal Relays. As a critical analog input card, the GE UR8AH provides high-accuracy measurement of phase currents, ground currents, and voltages for protection, metering, and monitoring functions in the UR relay platform.

The GE UR8AH supports 1 A / 5 A nominal CT inputs for three-phase currents plus ground, along with voltage transformer (VT) inputs, enabling comprehensive transformer, feeder, motor, and generator protection schemes. Its modular plug-in design allows easy insertion into UR chassis for flexible configuration. The GE UR8AH is widely used in utility substations, industrial power systems, and critical protection applications where precise analog signal acquisition is essential for reliable relay operation.

Model,GEUR8AH

Module Type,CT/VT Input Module (Analog Input Card)

Phase CT Inputs,3 × 1 A / 5 A nominal (configurable)

Ground CT Input,1 × 1 A / 5 A nominal

VT Inputs,4 Voltage Transformer inputs (standard)

Accuracy,Class 0.2 or better for metering and protection

Burden,Low burden design (<0.2 VA typical)

Frequency,50 / 60 Hz (auto-sensing)

Isolation,Galvanic isolation between channels and logic

Operating Temperature,-40°C to +60°C

Humidity,"5% to 95% RH, non-condensing"

Dimensions,Approx. 15 cm × 18 cm × 4 cm

Weight,Approx. 1.13 kg (2.5 lbs)

Mounting,Plug-in module for UR Series chassis

Compatibility,"GE Multilin UR Series Universal Relays (e.g., T60, L90, G60, etc.)"

Operating the GE UR8AH within a UR relay system follows standard Multilin UR procedures:

Insert the GE UR8AH module firmly into the designated slot in the UR chassis and ensure it is properly seated.

Apply control power to the UR relay and verify the module is recognized during self-diagnostic boot-up.

Configure CT/VT ratios, scaling factors, and protection settings via the front panel keypad or EnerVista UR Setup software.

Perform secondary injection testing to validate current and voltage measurement accuracy of the GE UR8AH.

Monitor real-time metering values (currents, voltages, power, frequency) on the relay HMI or SCADA system.

During normal operation, the GE UR8AH continuously feeds precise analog data to the relay CPU for protection algorithms.

In case of alarms, review event records and oscillography stored in the UR relay to analyze signals from the GE UR8AH.

Proper installation of the GE UR8AH is essential for measurement accuracy and protection reliability. Always de-energize the UR relay and isolate primary circuits before inserting or removing the module. Use the draw-out design carefully and ensure automatic shorting of CT circuits when the module is withdrawn. Connect CT and VT secondary wiring with correct polarity, phase sequence, and proper torque on terminal blocks. Ground the relay chassis securely. After installing the GE UR8AH, perform insulation resistance tests, verify CT shorting contacts, and conduct full secondary injection calibration before placing the protected equipment in service. Only qualified protection engineers trained on GE Multilin UR Series should install or service the GE UR8AH.

Routine maintenance ensures long-term accuracy and reliability of the GE UR8AH:

Visually inspect the GE UR8AH module and UR chassis for dust, loose connections, or abnormal heat during outages.

Review relay self-diagnostic logs and metering accuracy daily via the HMI or EnerVista software.

Verify CT/VT input signals match expected values and check for any drift or alarms.

Confirm control power voltage remains stable within specification.

Monitor operating temperature and ensure the environment stays within -40°C to +60°C.

Test protection element pickup levels periodically using secondary injection during planned maintenance.

Record any anomalies and schedule full calibration or module inspection every 1–2 years (or per utility policy) to sustain the precision of the GE UR8AH.

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