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The GE UR8NH (also designated UR-8NH) is a CT/VT (Current Transformer / Voltage Transformer) input module belonging to the GE Multilin Universal Relay (UR) Series. As a modular analog input card, the GE UR8NH equips UR-series relays (such as T60, L90, G60, C60, etc.) with standard current inputs for precise metering, protection, and monitoring of three-phase power systems. The GE UR8NH is an 8N-type module featuring enhanced diagnostics that continuously monitor hardware health, input signal integrity, and internal DC voltages, providing early warnings via the relay LCD or EnerVista software. It supports both 1 A and 5 A CT secondaries and is commonly configured with multiple phase CTs plus sensitive or residual ground CTs. The GE UR8NH enables scalable system upgrades, easy replacement of failed modules, and reliable analog data acquisition in substations, industrial plants, generators, transmission lines, and motor applications. Its robust design and advanced self-diagnostics make the GE UR8NH a preferred choice for maintaining or expanding legacy and modern UR-family protection relays.

Model,GE UR8NH (UR-8NH)

Manufacturer,GE Multilin (GE Vernova)

Series,Universal Relay (UR) Series

Product Type,CT/VT Analog Input Module (8N type with enhanced diagnostics)

CT Inputs,Standard 8 CT channels; typically 6 × Phase CT (1 A / 5 A) + 2 × Ground CT (1 A / 5 A)

VT Inputs,Dependent on specific UR relay configuration (module supports CT/VT signals)

Frequency,50 / 60 Hz (system dependent)

Diagnostics,"Enhanced health diagnostics (startup + continuous monitoring of hardware, signals, and DC voltage)"

Compatibility,"All UR Series relays (T60, L90, G60, etc.)"

Dimensions,Approx. 6” L × 7” W × 1.5” H

Weight,Approx. 1.15 kg

Mounting,Plug-in modular slot in UR chassis

Additional Features,Supports up to 24 analog CT/VT signals in full UR configuration; scalable and hot-swappable in some setups

Power down the UR relay chassis and remove the old CT/VT module if replacing.

Insert the GE UR8NH into the designated CT/VT slot, ensuring proper alignment with the backplane connectors.

Secure the module with retaining screws or latches.

Connect CT secondary wiring (phase and ground) to the corresponding terminals on the UR relay rear panel.

Restore power to the relay and verify module recognition on the front-panel display or via EnerVista UR Setup software.

Configure CT ratios, ground CT type, and protection elements in the relay settings.

Monitor analog values, metering, and diagnostic status during normal operation; perform secondary injection testing to validate accuracy.

De-energize the entire UR relay and associated CT circuits before inserting or removing the GE UR8NH to prevent damage or safety hazards.

Use proper ESD protection (grounded wrist strap) when handling the module to avoid static damage to sensitive analog circuitry.

Confirm the slot is compatible with CT/VT modules and that the relay firmware supports enhanced diagnostics (8N-type).

Short CT secondaries with test blocks during wiring changes; never leave CTs open-circuited while energized.

Verify CT polarity and ratios match the relay settings; use appropriately rated wiring and maintain separation from high-voltage circuits.

After installation, run the relay self-test and check diagnostic messages for any CT/VT channel faults before placing the system in service.

Ensure the UR chassis has adequate ventilation and operates within specified temperature limits.

Check the UR relay front-panel display or EnerVista software daily for any CT/VT-related alarms, diagnostic warnings, or “Module Fail” indications from the GE UR8NH.

Monitor real-time metering values (phase currents, ground current, sequence components) for unexpected deviations or zero-sequence anomalies.

Review event records and oscillography for any protection operations that may indicate CT wiring or module issues.

Inspect rear terminal connections and CT wiring periodically for tightness, corrosion, or signs of overheating.

Verify internal health diagnostics (analog channel integrity and DC voltage levels) remain healthy during routine checks.

Clean dust from the relay chassis and module area (power off) using low-pressure compressed air every 1–3 months, depending on environment.

During scheduled outages, perform secondary injection tests on CT inputs, validate ground fault sensitivity, and confirm firmware compatibility; backup all relay settings.

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