Description
Product Overview
GE Multilin UR8LH is a CT/VT analog measurement expansion module for GE Vernova UR series universal protection relays. It provides 4 current transformer (CT) and 4 voltage transformer (VT) input channels, delivering high-precision AC current and voltage sampling for power protection, metering, fault recording and oscillography. Widely applied in power substations, generator protection, motor protection and industrial power distribution systems, this plug-in module serves as spare replacement hardware for existing UR relay chassis such as C60, G60, M60, D60, F60.
Technical Specifications
| Parameter | Details |
|---|---|
| Part Number | UR8LH (UR-8LH) |
| Brand | GE Multilin (GE Vernova) |
| Type | 4CT+4VT Analog Transducer Input Module |
| Compatible Host | UR Series Universal Relays (G60, M60, D60, F60, C60 etc.) |
| Input Channels | 4 CT, 4 VT |
| Measurement Accuracy | ±0.1% full scale |
| CT Input | 1A or 5A secondary CT configurable |
| VT Input | 120V / 240V nominal voltage transformer secondary |
| Diagnostics | CT open circuit, VT blown fuse, wiring anomaly detection |
| Galvanic Isolation | High isolation between power circuit and relay logic |
| Power Supply | Powered by UR chassis backplane |
| 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 | ~0.35 kg |
| Certifications | CE, UL, IEC 60255 |
| Configuration Software | EnerVista UR Setup Software |
Key Features
- 4 CT + 4 VT high precision analog inputs for three-phase current, voltage and neutral monitoring
- Built-in enhanced diagnostics to detect CT open circuit, VT fuse failure and wiring faults
- Supports high-speed waveform sampling for fault oscillography and disturbance recording
- Hot-swappable plug-in design for UR relay chassis
- Works seamlessly with relay protection logic, metering, sequence of events (SOE) and fault report
- Software configurable CT secondary rating (1A/5A) and VT scaling via EnerVista UR Setup
- Rugged substation-grade EMC protection for high EMI environment
Installation & Testing Notes
- Insert UR8LH into the designated rear expansion slot of UR series relay chassis
- Terminate CT and VT wiring strictly following polarity rules; wrong polarity will cause protection misoperation
- Verify CT circuit never be open while energized; confirm VT secondary no short circuit before power-up
- Configure CT/VT ratio and secondary rating in EnerVista UR setup software
- After configuration, run module self-test, check CT/VT health diagnostic status
- Hot swap is supported when host relay is powered; avoid replacement during live primary fault condition
- Perform secondary injection test to validate measurement accuracy and protection pickup
- Review oscillography capture function after commissioning
FAQ
Q: What is UR8LH? A: It is 4CT+4VT analog input expansion module for GE Multilin UR universal protection relays.
Q: What is the difference between UR8LH and UR6PH? A: UR8LH is CT/VT analog measurement module; UR6PH is digital DI/DO relay I/O expansion module.
Q: Is UR8LH hot swappable? A: Yes, plug-in hot swap supported within UR relay chassis.
Q: What software configures UR8LH parameters? A: EnerVista UR Setup software.
Q: What faults can UR8LH detect? A: CT open circuit, VT fuse failure and wiring abnormality alarms.
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