Overview
It directly interfaces with protection-grade current transformers and voltage transformers in substation automation systems.
Moreover, the module ensures precise analog measurement required for reliable protection, control, and metering functions.
Its robust hardware design supports stable operation under harsh electrical and environmental conditions.
Therefore, protection engineers widely deploy the UR-8NH in critical transmission and distribution applications.
Specification
| Parameter | Specification |
|---|---|
| Product Type | CT / VT Input Module |
| Model | UR8NH / UR-8NH |
| Manufacturer | GE Multilin |
| Platform Compatibility | UR Series Universal Relays |
| Number of CT Channels | Up to 4 protection-grade inputs |
| CT Secondary Ratings | 1 A or 5 A selectable |
| CT Input Burden | Low burden optimized for protection-class CTs |
| CT Measurement Accuracy | High accuracy for protection and metering |
| Number of VT Channels | Up to 4 voltage measurement inputs |
| VT Secondary Ratings | Standard VT secondary voltages |
| VT Measurement Accuracy | High accuracy for protection and metering |
| Voltage Connection Types | Line-to-neutral and line-to-line |
| System Frequency Range | 45–65 Hz nominal |
| Input Isolation | Galvanic isolation between channels |
| EMC Compliance | Meets utility EMC standards |
| Operating Temperature | Industrial substation environment |
| Storage Temperature | Extended industrial storage range |
| Humidity Tolerance | Designed for high-humidity installations |
| Module Form Factor | Plug-in modular card |
| Installation Method | UR-series relay chassis slot |
| Cooling Method | Passive cooling via chassis airflow |
| Hot-Swap Capability | Supported in compatible UR systems |
| Calibration Requirement | No routine calibration required |
| Serviceability | Field-replaceable module |
| Expected Service Life | Long-term utility-grade operation |
FAQ
A1: The UR8NH module collects CT and VT signals to support protection, metering, control, and monitoring functions.
Q2: Which relay systems are compatible with the UR8NH module?
A2: The UR8NH module works exclusively with GE Multilin UR Series Universal Relays and matching chassis platforms.
Q3: Does the UR8NH support both 1 A and 5 A CT secondary ratings?
A3: Yes, the module supports both 1 A and 5 A CT inputs, allowing flexible adaptation to different substation standards.
Q4: Can the UR8NH process current and voltage signals at the same time?
A4: Yes, the module simultaneously processes CT and VT inputs, enabling comprehensive protection and metering applications.
Q5: Is routine calibration required during normal operation?
A5: No routine calibration is required, as the module maintains stable measurement accuracy over its service life.
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