ABB REF620 Feeder Management Relay

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1. Product Overview

The ABB REF620 Feeder Management Relay is a member of the ABB Relion® 620 series, designed for protection, control, measurement, and supervision of medium-voltage distribution feeders. By integrating multiple protection and automation functions into a single device, the REF620 enhances system reliability, safety, and operational efficiency in both utility and industrial power networks.

2. Technical Specifications

• Model: REF620

• Product Type: Feeder Management Relay

• Series: ABB Relion® 620 series

• Applicable Voltage Level: Medium-voltage distribution systems (typically 1 kV to 36 kV)

• Rated Frequency: 50 / 60 Hz

• Current Inputs:

  • Phase currents (IA, IB, IC)

  • Residual current (I0)

• Voltage Inputs:

  • Three-phase or line voltages

  • Residual voltage (U0, optional)

• Main Protection Functions:

  • Overcurrent protection (instantaneous and time-delayed)

  • Earth-fault protection

  • Directional overcurrent and earth-fault protection

  • Load supervision and overload protection

  • Circuit breaker failure protection

• Control Functions:

  • Circuit breaker open/close control

  • Disconnector control (optional)

• Measurement Functions:

  • Current, voltage, power, power factor, frequency

  • Energy metering (active and reactive)

• Communication Interfaces:

  • Ethernet

  • Serial communication ports

• Communication Protocols:

  • IEC 61850

  • IEC 60870-5-103

  • Modbus

  • DNP3 (depending on configuration)

• Event and Disturbance Recording:

  • Sequence of events (SOE)

  • Disturbance and fault recording

• Display and Operation:

  • Graphical LCD display

  • Local push-button interface

• Mounting:

  • Panel-mounted or flush-mounted

• Standards:

  • IEC 60255

  • IEC 61850

3. Advantages and Features

1. All-in-One Functionality
   Combines protection, control, measurement, and communication in one relay.

2. Reliable Feeder Protection
   Comprehensive overcurrent and earth-fault protection suitable for various grounding systems.

3. IEC 61850 Compliance
   Enables seamless integration into digital substations and smart grid systems.

4. Advanced Fault Analysis
   Disturbance recording and event logs support fast fault diagnosis.

5. Flexible Configuration
   Adaptable to different application requirements and network topologies.

4. Applications

• Medium-voltage feeder protection

• Utility distribution networks

• Industrial power distribution systems

• Substation feeder bays

• Energy, mining, and petrochemical industries

• Smart grid and digital substation projects

5. Installation and Usage Notes

1. Verify that the relay configuration matches the system protection requirements before installation.

2. Ensure correct CT and VT wiring to avoid maloperation.

3. Perform parameter setting, secondary circuit checks, and functional testing before commissioning.

4. Confirm communication protocol and network settings when integrating into control systems.

5. Periodic inspection and review of event records are recommended for reliable operation.