The ABB REU610 (specifically the CVVHCNN configuration) is a versatile voltage and frequency protection relay designed for the protection and supervision of motors, generators, and distribution substations. While often used in motor control centers to detect under-voltage or over-voltage conditions that could damage winding insulation, it also serves as a critical component for automatic load shedding and busbar supervision.
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Product Specifications
| Feature | Details |
| Model Name | REU610 |
| Configuration Code | CVVHCNN |
| Series | Relion 610 |
| Country of Origin | Finland |
| Primary Functions | Under-voltage, Over-voltage, Residual Voltage |
| Secondary Functions | Frequency Protection (f<, f>, df/dt) |
| Auxiliary Voltage | 48-250V DC / 100-240V AC |
| Dimensions (WxHxD) | 149 x 160 x 235 mm |
| Net Weight | 3.2 kg |
Operational Precautions
- VT Secondary Connection: Ensure the Voltage Transformer (VT) secondary leads are properly fused and connected. Unlike CTs, VT secondaries must never be short-circuited as this will lead to high current flow and component failure.
- HMI Protection: The front panel LCD and navigation keys are precision components. Avoid using screwdrivers or sharp tools to navigate menus; use only fingers or an approved stylus to prevent screen cracking.
- Phase Sequence Awareness: For motor protection applications, ensure the phase sequence (L1, L2, L3) matches the relay configuration to ensure accurate calculation of negative sequence voltages.
- Mounting Depth: The REU610 requires a significant depth (approx. 235mm) behind the panel. Ensure there is adequate clearance for wiring harnesses and airflow within the cabinet.
FAQ (Questions & Answers)
Q: Can the REU610 be used for motor protection? A: Yes. It is frequently used for “Voltage-Based” motor protection, such as detecting phase imbalance or sustained under-voltage conditions that lead to motor overheating. For comprehensive thermal and current-based protection, it is often paired with an REM610 or REM615.
Q: What does the “CVVHCNN” code indicate? A: This is a hardware/software configuration string that specifies the auxiliary power supply range, the number of binary inputs/outputs, and the supported communication protocols (such as Modbus or IEC 60870-5-103).
Q: Does it support frequency-based load shedding? A: Yes, the REU610 includes multi-stage frequency protection and rate-of-change (df/dt) functions, making it suitable for automatic load shedding in weak grids or islanded systems.
Similar Relion 610/615 Series Models
- REM610 (CVVHCNN): Dedicated Motor Protection Relay (Current-based).
- REF610 (CVVHCNN): Feeder Protection Relay for overcurrent and earth-fault.
- REU615 (1VH991012326): Modern successor with full IEC 61850 support and color HMI.
- REM615 (1VH991012323): Advanced Motor Protection and Control IED.
- RET615 (1VH991012324): Specialized Transformer Protection and Control IED.
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