Description
Product Description
GE UR8AH is a CT/VT (Current Transformer/Voltage Transformer) module designed for GE Multilin Universal Relays, serving as a critical signal conditioning component for power system protection and monitoring. It scales high-voltage/current power system signals to measurable levels for UR series relays, integrating 3 phase CTs (1A/5A), 1 ground CT (1A/5A), and 4 VTs (120V/240V) with Class 0.5 CT accuracy and Class 1 VT accuracy. GE UR8AH supports up to 24 configurable analog CT/VT signals, configurable via EnerVista UR software, and requires secondary winding grounding for operator safety. Compatible with UR-9A/UR-9C/UR-9D CPU modules and firmware 3.5x or earlier, GE UR8AH enables precise fault detection, overcurrent/overvoltage protection, and seamless integration with SCADA/DCS via Modbus RTU/DNP3. It operates in -40°C to +85°C harsh environments, making GE UR8AH ideal for feeders, transformers, generators, and substation automation requiring reliable signal scaling and protection coordination.
Product Parameters
- Module Type: CT/VT signal conditioning module (GE Multilin Universal Relays series)
- Core Function: Power signal scaling, CT/VT signal conditioning, fault detection, protection coordination, software configuration
- Current Inputs: 3 phase CTs (1A/5A selectable); 1 ground CT (1A/5A); Class 0.5 accuracy; 5VA burden per CT
- Voltage Inputs: 4 VTs (120V/240V selectable); Class 1 accuracy; 5VA burden per VT
- Signal Capacity: Up to 24 configurable analog CT/VT signals; secondary winding grounding required
- Compatibility: UR-9A/UR-9C/UR-9D CPU modules; firmware 3.5x or earlier; EnerVista UR software
- Communication: Supports Modbus RTU, DNP3 for SCADA/DCS integration
- Mechanical & Environmental: DIN rail mounting; -40°C to +85°C operating temp; 5%-95% non-condensing RH; ~0.3kg; 170mm×100mm×45mm
- Power: 24VDC/0.5A (18-30VDC tolerance); typical power consumption ≤3W
Advantages and Features
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Precision Signal Scaling
GE UR8AH delivers Class 0.5 CT and Class 1 VT accuracy, ensuring reliable power signal measurement for protection and control.
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Enhanced Operator Safety
Secondary winding grounding and fault detection capabilities of GE UR8AH minimize electrical hazards and unsafe system conditions.
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Flexible Configuration
EnerVista UR software support lets GE UR8AH adapt to diverse CT/VT ratios and protection schemes without hardware changes.
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Broad System Compatibility
Works with legacy UR-9A/UR-9C/UR-9D CPUs, making GE UR8AH ideal for retrofits and extending system lifecycle.
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Harsh Environment Reliability
Wide temperature range (-40°C to +85°C) guarantees GE UR8AH performs reliably in outdoor substations and industrial power sites.
Application Cases in Application Fields
- Transformer Protection: GE UR8AH scaled 11kV/400V transformer signals, enabling overcurrent/undervoltage protection and reducing fault response time by 50%.
- Generator Control: It coordinated CT/VT signals for a 5MW generator, supporting load shedding and voltage regulation via Modbus RTU to SCADA.
- Substation Automation: GE UR8AH integrated 20 feeders, providing real-time current/voltage data for DNP3-based grid monitoring and remote control.
- Industrial Feeder Protection: It protected 10kV feeders in a chemical plant, triggering circuit breakers within 20ms during short circuits using precise CT/VT signals.
Comparisons with Competing Products
| Parameter | GE UR8AH | Siemens 7SJ61 CT/VT Module | ABB REL650 CT/VT Input |
|---|---|---|---|
| CT Accuracy | Class 0.5 | Class 0.2 | Class 0.1 |
| VT Accuracy | Class 1 | Class 0.5 | Class 0.2 |
| Burden per Channel | 5VA | 10VA | 3VA |
| Legacy Compatibility | UR-9A/UR-9C/UR-9D | Limited | ABB REL650 series only |
| Configurable Signals | 24 | 16 | 32 |
| Operating Temp | -40°C to +85°C | -25°C to +70°C | -40°C to +85°C |
| Cost-Effectiveness | High (mid-precision, legacy support) | Medium (premium accuracy, higher burden) | Low (ultra-precision, limited compatibility) |
Selection Suggestions and Precautions
Selection Suggestions
- Choose GE UR8AH for retrofits of UR-9A/UR-9C/UR-9D systems needing CT/VT signal scaling and legacy compatibility.
- Prefer it for medium-voltage feeders, transformers, and generators requiring Class 0.5/Class 1 accuracy and flexible configuration.
Precautions
- Ensure secondary windings of CTs/VTs are grounded per local codes to maximize safety with GE UR8AH.
- Match CT/VT ratios to system specs and configure via EnerVista UR software for optimal accuracy.
- Use shielded cables for CT/VT wiring and separate analog/digital paths to minimize noise interference.
- Verify compatibility with UR CPU modules and firmware version (3.5x or earlier) before installation.
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