Description
Product Overview
GE Multilin UR8NH is an 8-channel CT/VT analog acquisition expansion module for GE Vernova Multilin UR series universal protection relays. It samples secondary current and voltage signals from CT and VT transformers, converts analog power waveforms into digital data for the relay main CPU. This module supports high-precision metering, protective relaying, fault oscillography and disturbance recording. Widely used in power substations, generator protection, large motor protection and industrial power distribution systems. It is a pluggable spare replacement part for UR relay chassis including G60, M60, D60, F60, C60.
Technical Specifications
| Parameter | Details |
|---|---|
| Part Number | UR8NH (UR-8NH) |
| Brand | GE Multilin (GE Vernova) |
| Type | 8-Channel CT/VT Analog Input Module |
| Compatible Host | UR Series Universal Relays (G60, M60, D60, F60, C60 etc.) |
| Input Channels | 8 analog channels for CT/VT signals |
| CT Input | Configurable for 1A or 5A secondary current |
| VT Input | 120V / 240V nominal transformer secondary voltage |
| Measurement Accuracy | ±0.1% full scale |
| Built-in Diagnostics | CT open circuit detection, VT fuse failure detection, A/D converter health monitoring |
| Galvanic Isolation | High dielectric isolation between power circuit and relay logic circuitry |
| Power Supply | Powered by UR chassis backplane, no external power needed |
| Operating Temperature | -40°C ~ +85°C |
| Storage Temperature | -40°C ~ +85°C |
| Humidity | 5~95% RH, non-condensing |
| Mounting | Slot plug-in inside UR universal relay chassis |
| Net Weight | ~0.36 kg |
| Certifications | CE, UL, IEC 60255 |
| Configuration Software | EnerVista UR Setup Software |
Key Features
- 8 high-speed analog channels for multi-circuit CT/VT waveform sampling, supports complex protection algorithms
- Onboard diagnostics to detect CT open circuit, VT fuse failure and wiring faults
- High resolution sampling for fault oscillography, event recording and power quality monitoring
- Hot-swappable plug-in design inside UR relay chassis
- Software configurable CT secondary rating and VT scaling through EnerVista UR Setup
- Substation-grade EMC surge protection for harsh high EMI environments
- Supports sequence of event (SOE) timestamping for post-fault analysis
Installation & Testing Notes
- Insert UR8NH into the designated rear expansion slot of UR series relay chassis
- Terminate CT and VT wiring strictly following polarity requirements; reversed polarity will cause protection misoperation
- Ensure CT circuit must never be open while energized; prevent VT secondary short circuit before applying power
- Configure CT/VT ratio and secondary rating parameters in EnerVista UR Setup software
- After configuration, execute module self-test and verify CT/VT diagnostic status
- Hot swap is supported with host relay powered; avoid replacement during live primary fault events
- Perform secondary injection test to validate measurement accuracy and protection pickup thresholds
- Verify fault waveform capture function after commissioning
FAQ
Q: What is UR8NH used for? A: It is an 8-channel CT/VT analog input expansion module for GE Multilin UR universal protection relays.
Q: What is the difference between UR8NH and UR8LH? A: UR8NH is 8-channel CT/VT module; UR8LH is 4CT+4VT module, total 8 channels as well, different hardware variant for UR relay platform.
Q: Is UR8NH hot swappable? A: Yes, plug-in hot swap supported within UR relay chassis.
Q: What software configures UR8NH? A: EnerVista UR Setup software.
Q: What fault conditions can this module detect? A: CT open circuit, VT fuse failure, and internal A/D converter faults.
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