ABB REF620 Dedicated Feeder Management Relay

ABB REF620 Feeder Protection and Control Relay

The ABB REF620 is an advanced feeder protection and control relay from the Relion® 620 series, designed to safeguard and manage outgoing power lines (feeders) in medium-voltage power distribution networks. As a key component in modern substations, the REF620 ensures reliable, safe, and efficient power delivery.

Core Functions

1. Protection
REF620 detects and isolates faults such as short circuits and earth faults to protect equipment and maintain system stability. It supports a wide array of protection functions:

• Overcurrent protection

• Earth-fault protection, including advanced multifrequency admittance-based protection

• Fault location

• Optional modules for:

• Distributed generation interconnection

• Capacitor bank protection

• Basic motor protection

• Arc flash protection

2. Control
Enables remote and local control of switching devices like circuit breakers, allowing safe and efficient power flow management and isolation during faults or maintenance.

3. Measurement
Continuously monitors electrical parameters such as current, voltage, power, and frequency—providing real-time data for operational analysis and optimization.

4. Supervision
Monitors the health and performance of the feeder, detecting abnormalities to prevent potential system failures.

Key Features and Benefits

• All-in-One Solution: Combines protection, control, measurement, and supervision in a compact, integrated unit.

• Flexible Deployment: Suitable for radial, looped, or meshed networks—with or without distributed generation.

• Advanced Earth-Fault Detection: Multifrequency admittance-based algorithm delivers high sensitivity and precise fault location.

• IEC 61850 Compliant: Ensures seamless substation automation, supporting GOOSE messaging, HSR, and PRP redundancy.

• User-Friendly Interface: Equipped with a large graphical display and customizable single-line diagrams (SLDs); also accessible via web-based HMI.

• Withdrawable Design: Plug-in module enables fast installation, easy commissioning, and simplified maintenance.

• Multi-Protocol Support: In addition to IEC 61850, it supports Modbus, DNP3, and IEC 60870-5-103 protocols for broad integration compatibility.