The ABB REF615 is a digital feeder protection and control relay that is used in medium-voltage substations and industrial power systems. It is a modular relay that can be configured to meet the specific needs of the application.

The REF615 offers a wide range of protection functions, including:

• Overcurrent protection
• Undervoltage protection
• Overvoltage protection
• Phase-to-phase and phase-to-ground fault protection
• Directional protection
• Distance protection
• Earth fault protection
• Reclosing protection
• Load shedding protection

The REF615 also provides a variety of control and measurement functions, including:

• Tap changer control
• Circuit breaker control
• Metering
• Supervision

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