GE UR8NH input expansion module

Part Number: UR8NH
Manufacturer: General Electric
Series: Mark VIe
Product Type: Simplex Analog Input Terminal Board
Number of channels: 12
Maximum Lead Resistance: 15 Ω
Outputs: 24 V dc
Size: 15.9 cm high x 10.2 cm wide
Operating Temperature: -30 to +65oC
Technology: Surface mount
Repair: 3-7 Days
Country of Origin: USA
Availability: In Stock

GE UR8NH

1. UR8NH Product Overview

The GE UR8NH is an 8-channel standard CT analog input expansion module belonging to the GE Multilin UR series universal relay platform. Designed for power system protection, high-precision metering and waveform data acquisition, this module serves as a critical signal acquisition interface for UR-series protective relays including D60, G60, L90, and B30. The UR8NH receives secondary current signals from current transformers (CTs), converts analog field signals into high-resolution digital data, and transmits measured values to the main relay CPU for protection algorithms, power metering and real-time monitoring. Built with reinforced galvanic isolation and comprehensive onboard diagnostics, it effectively prevents interference and equipment damage between high-voltage field circuits and relay control logic. Widely deployed in utility transmission and distribution substations, industrial power plants, transformer monitoring systems and renewable energy power stations, it meets strict ANSI, IEEE and IEC power system protection standards.

2. UR8NH Core Product Features & Key Advantages

The GE UR8NH integrates high-precision signal sampling technology and substation-grade hardware design to deliver stable, dependable analog measurement performance:

• 8 Independent CT Input Channels: High-density current acquisition supports system expansion for multi-feeder, transformer bank monitoring, saving cabinet rack space.
• Software-Selectable CT Secondary Rating: Compatible with both 1 A and 5 A nominal CT secondary signals for flexible site configuration.
• Reinforced Galvanic Isolation: 2500 Vrms isolation between field CT circuits and relay backplane, eliminating ground loop risks and isolating surge disturbance.
• Advanced Built-In Diagnostic Functions: Continuously detects open CT circuits, CT saturation, signal polarity errors, phase imbalance and signal overrange to avoid protection misoperation.
• Hot-Swap Support: Supports live insertion and removal with automatic CT shorting logic, enabling module maintenance without system shutdown and improving overall system availability.
• 16-bit High-Resolution ADC Sampling: Synchronous high-speed sampling ensures accurate waveform capture and high-grade metering & protection measurement precision.
• Ultra-Low CT Burden Design: Minimizes CT loading errors and guarantees measurement accuracy under long field wiring conditions.
• Full EnerVista Software Compatibility: All channel parameters can be configured, calibrated and monitored via GE EnerVista UR configuration software.

3. Classified Technical Parameters (Core Highlight)

Structured modular layout for engineering selection, system commissioning and search engine retrieval.

3.1 Signal & Measurement Performance Parameters

• Model: UR8NH (Multilin UR Series Analog Input Module)
• Channel Configuration: 8 isolated CT current input channels
• Nominal CT Secondary: Software selectable 1 A / 5 A
• Measurement Accuracy: ±0.2% full scale (protection & revenue metering grade)
• ADC Resolution: 16-bit per channel
• Applicable Frequency: 45 Hz – 65 Hz (50 Hz / 60 Hz power grid adaptable)
• Sampling Mode: Synchronous high-speed sampling for transient waveform recording
• CT Burden: Ultra-low burden design to reduce CT operating load

3.2 Electrical Specifications

• Module Power Supply: Powered via UR relay backplane (no separate external power wiring)
• Maximum Power Consumption: 7.2 W
• Dielectric Withstand Voltage: 2500 Vrms reinforced isolation (field side to backplane logic)
• Diagnostic Coverage: Open CT, CT saturation, polarity fault, overrange, channel hardware abnormality
• EMC Compliance: Compliant with international substation electromagnetic compatibility standards

3.3 System Compatibility Parameters

• Supported Host Devices: GE Multilin UR series universal relays (D60, G60, L90, B30 and other UR models)
• Configuration Tool: GE EnerVista UR Software Suite
• Expansion Capacity: Multiple UR8NH modules can be installed in one chassis to expand CT acquisition capacity
• Installation Slot: Standard plug-in slot for UR relay rack

3.4 Environmental Adaptability Parameters

• Operating Ambient Temperature: -40°C ~ +70°C (-40°F ~ +158°F)
• Storage Temperature Range: -55°C ~ +85°C (-67°F ~ +185°F)
• Relative Humidity: 5% ~ 95% RH, non-condensing
• Mechanical Performance: Industrial anti-vibration and anti-shock design for substation cabinet environments
• PCB Protection: Conformal coating to resist dust, humidity and mild corrosive gas

3.5 Physical & Installation Parameters

• Overall Dimensions (L × W × D): 178 mm × 152 mm × 38 mm (7.0” × 6.0” × 1.5”)
• Net Weight: Approximately 1.15 kg
• Installation Form: Plug-in draw-out module for UR series relay chassis
• Heat Dissipation: Passive natural cooling, no built-in fan
• Protection Class: IP20 (for indoor cabinet installation)

4. Typical Application Scenarios

The GE UR8NH analog CT input module is specially applied to power system protection and monitoring projects:

• Transmission & distribution substation feeder protection relays
• Power transformer differential protection and current monitoring systems
• Industrial large power plant auxiliary power monitoring
• Renewable energy grid connection protection cabinets
• Utility substation multi-circuit current signal centralized acquisition
• Power quality monitoring and fault recording systems

As an extended signal acquisition unit for UR universal relays, it expands the number of measurable CT circuits, provides reliable raw current data for relay protection logic, and enhances the capability of fault judgment and accident analysis.

5. Product Core Value Summary

The GE UR8NH is a high-reliability expansion analog input module designed exclusively for the GE Multilin UR relay platform. Its 8-channel high-density CT acquisition, ±0.2% high measurement accuracy and powerful onboard diagnostics ensure credible data acquisition for power protection and metering. Reinforced isolation and hot-swap capability greatly improve system safety and maintainability. With wide temperature adaptability and seamless compatibility with mainstream UR-series protective relays, the UR8NH serves as an essential expansion component for constructing high-standard substation protection systems, reducing equipment investment and simplifying engineering design.