ABB REU610 CVVHCNR Voltage Protection Relay

Product Overview

The ABB REU610 CVVHCNR is an intelligent voltage protection relay within the Relion® 610 series, engineered for comprehensive busbar and feeder supervision. It is specialized for detecting over-voltage and under-voltage conditions in distribution substations, power transformers, and motors. 

Technical Specifications

• Model Number: REU610 CVVHCNR.

• Product Series: Relion 610.

• Core Function: Voltage Supervision and Protection.

• Overvoltage Protection: Two-stage integrated logic.

• Undervoltage Protection: Two-stage integrated logic.

• Earth-Fault Detection: Two-stage Residual Overvoltage protection.

• Phase Sequence Logic: Negative phase-sequence overvoltage or Positive phase-sequence undervoltage.

• Protocols: IEC 61850, Modbus, DNP3, Profibus, SPA, LON, IEC 60870-5-103.

• Certifications: KEMA Certified, DNV (Marine/Offshore) Approved.

Key Features and Engineering Advantages

• Integrated Voltage Suite: Provides precise two-stage monitoring for both over-voltage and under-voltage, ensuring that sensitive industrial equipment and motors are not damaged by grid instability.

• Residual Voltage Monitoring: Specifically effective in isolated neutral systems for non-discriminative earth-fault protection, identifying phase-to-ground faults via residual voltage measurement.

• Automatic Busbar Changeover: Includes built-in initialization logic for substation busbar changeover, ensuring a seamless transition to backup power sources during primary failures.

• Islanding Detection: Protects the public network by automatically disconnecting small power units (distributed generation) during grid disturbances to prevent unsafe islanding.

• Draw-out Maintenance Efficiency: The removable plug-in design allows for rapid insertion and withdrawal, significantly reducing downtime during commissioning or routine maintenance.

• Broad Communication Gateway: Supports a wide range of protocols, from legacy Modbus and SPA to modern IEC 61850, ensuring compatibility with diverse SCADA and automation architectures.