Precision Analog Measurement for Modern Protection Systems
The GE UR8LH CT/VT Module is engineered to deliver highly accurate current and voltage signal acquisition for GE Multilin Universal Relay platforms. Equipped with four CT inputs, four VT inputs, and advanced analog diagnostic technology, it enables dependable protection, metering, and monitoring across substations, industrial facilities, and utility networks. Its modular architecture, high-speed signal processing, and proven compatibility with the UR relay family make it an excellent solution for critical power system applications requiring long-term operational reliability.
Technical Specifications
| Parameter | Specification |
|---|
| Product Model | UR8LH |
| Product Type | CT/VT Module |
| Series | GE Multilin Universal Relay (UR) |
| CT Inputs | 3 × Phase CT (1 A / 5 A), 1 × Ground CT (1 A / 5 A) |
| VT Inputs | 3 × Phase VT + 1 × Auxiliary VT |
| Input Voltage Range | 50–240 VAC (VT Inputs) |
| System Frequency | 50 / 60 Hz |
| Analog Diagnostics | Enhanced Analog Channel Diagnostics |
| Signal Processing | High-Resolution A/D Conversion |
| Installation | Plug-In Module for UR Relay Platform |
| Operating Temperature | -40°C to +85°C |
| Dimensions (W × H × D) | Approximately 40 × 185 × 172 mm |
| Weight | Approximately 1.20 kg |
Recommended Companion Models
| Model | Product Name |
|---|
| UR7HH | CPU Module |
| UR6TH | Power Supply Module |
| UR6FH | Digital I/O Module |
| UR9EH | Communication Module |
Frequently Selected Alternatives
| Model | Product Name |
|---|
| UR8FH | CT/VT Module |
| UR8MH | CT/VT Module |
| UR8RH | CT/VT Module |
| UR8VH | CT/VT Module |
Technical Questions & Answers
1. What is the primary function of the UR8LH module?
The UR8LH is a CT/VT input module that acquires current and voltage transformer signals for GE Multilin Universal Relay systems, enabling accurate measurement, monitoring, and protection of electrical power networks.
2. How many CT and VT inputs are supported?
The module supports four current transformer (CT) inputs and four voltage transformer (VT) inputs, including three phase CTs, one ground CT, three phase VTs, and one auxiliary voltage input.
3. Does the UR8LH include enhanced diagnostic capabilities?
Yes. The module continuously verifies analog measurement integrity and can detect internal analog channel failures, improving the reliability of protection functions.
4. Which relay platform is compatible with this module?
The UR8LH is designed for installation in the GE Multilin Universal Relay (UR) platform and integrates directly with compatible protection relays.
5. What CT ratings are supported?
The module accepts both 1 A and 5 A secondary current transformer inputs, allowing compatibility with a wide range of industrial and utility protection systems.
6. Can the module operate in both 50 Hz and 60 Hz power systems?
Yes. It is designed to support both 50 Hz and 60 Hz electrical networks without requiring hardware modification.
7. How does the module improve protection accuracy?
It utilizes high-resolution analog-to-digital conversion and continuous analog signal validation to provide precise electrical measurements for relay decision-making.
8. Is firmware compatibility important when installing the UR8LH?
Yes. Enhanced diagnostic functions are supported on compatible UR relay firmware versions, and system firmware should be verified before commissioning.
9. Can the UR8LH be used when upgrading an existing Universal Relay?
Yes. The plug-in modular design allows the module to replace or upgrade existing CT/VT modules without requiring major system modifications.
10. What are the benefits of using enhanced diagnostics in protection applications?
Enhanced diagnostics improve measurement reliability by detecting analog channel abnormalities, reducing the risk of incorrect relay operation and improving overall system security.
