Description
GE Multilin UR8NH CT/VT Module
The GE Multilin UR8NH is a high-performance analog input module designed for the Universal Relay (UR) series. It serves as a critical interface for sensing current and voltage levels from power system transformers, providing the high-fidelity data required for advanced protection and metering algorithms.
Product Introduction
The UR8NH CT/VT Module is a specialized hardware component that occupies one of the I/O slots in a UR chassis. This module is engineered to handle the high-speed sampling and digitization of analog waveforms. By integrating the GE UR8NH into a relay system, utilities can ensure precise monitoring of electrical parameters for distance, differential, and overcurrent protection schemes.
GE MULTLIN UR8NH
Technical Specifications (Datasheet)
The UR8NH module is characterized by its high accuracy and robust isolation properties. Below are the core technical parameters:
| Parameter | Specification |
| Input Type | Combined CT (Current Transformer) and VT (Voltage Transformer) |
| Configuration | 4 Current Inputs + 4 Voltage Inputs |
| Current Measurement Range | 1 A / 5 A (Nominal), software-configurable |
| Voltage Measurement Range | 0 V to 300 V AC (Secondary) |
| Frequency Support | 50 Hz and 60 Hz systems |
| A/D Conversion | 128 samples per cycle (high resolution) |
| Accuracy Class | 0.1% for metering / 3% for protection |
| Burden | < 0.2 VA at rated current |
| Thermal Withstand | 20 A continuous (Current), 400 A for 1 second |
| Country of Origin | USA / Canada (Primary manufacturing centers) |
Product Features
- Dynamic Range: Capable of capturing high-magnitude fault currents without saturation of the digital signal.
- Galvanic Isolation: Provides superior protection against common-mode noise and high-voltage surges from the primary side.
- Self-Diagnostics: Continuous monitoring of the internal analog-to-digital converters and reference voltages.
- Plug-and-Play Integration: Automatically recognized by the UR CPU for seamless configuration via EnerVista software.
Application Guidelines
- Mounting: The module must be installed in a standard UR 19-inch rack or compact chassis. Ensure the module is fully seated in the backplane before tightening the retaining screws.
- Wiring: Use ring terminals for CT connections to prevent accidental open circuits. Voltage inputs should be fused according to local safety standards.
- Commissioning: Verify the CT/VT ratios within the relay settings to match the primary field equipment for accurate scaling.
- Redundancy: In Triple Modular Redundancy (TMR) applications, multiple UR8NH modules provide independent sensing paths for high-reliability systems.
Recommended Similar Models
For different input configurations or specialized sensing requirements within the GE Multilin UR platform, consider the following:
- UR8FH: A standard 4CT/4VT module used in general-purpose protection applications.
- UR8G: A high-density 8-channel Current (CT) input module for busbar protection.
- UR8L: Specialized CT/VT module with sensitive ground current inputs for ungrounded systems.
- UR8J: An 8-channel Voltage (VT) module optimized for synchrocheck and bus voltage sensing.
- UR8M: A dedicated high-speed analog interface for fast bus differential protection schemes.
