ABB REF611 Power Supply Protection Relay

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1. Product Overview

The ABB REF611 is part of the Relion® protection and control family, designed specifically for feeder protection in medium-voltage distribution networks. It provides comprehensive protection functions, including overcurrent, earth-fault protection, overload, phase imbalance, and loss-of-phase detection.

With an integrated LCD display, advanced measurement features, and strong communication capability, REF611 is a reliable and intelligent device for modern power distribution automation.

2. Main Technical Specifications

• Model: REF611

• Application: Feeder protection

• Auxiliary Power Supply: 24–250 V DC / 48–240 V AC

• Frequency: 50/60 Hz

• CT Inputs: 1 A / 5 A

• VT Inputs: 100–110 V

• Protection Functions:

  • Three-stage overcurrent protection (50/51)

  • Earth-fault protection (50N/51N)

  • Overload protection

  • Phase imbalance detection

  • Loss-of-phase detection

  • Reclose logic

  • Self-supervision and fault diagnostics

• Measurements:

  • Current, voltage, frequency, phase angle

  • Demand and harmonic monitoring

• Digital I/O:

  • DI: 8–12

  • DO: 6–8

• Communication Protocols:

  • IEC 61850

  • Modbus RTU/TCP

  • DNP3

  • SPA

• Recording & Analysis:

  • Event recorder with 1 ms resolution

  • Disturbance recorder and SOE

• Mounting: Panel flush mounting

• Protection Class: IP54 (front panel)

• Operating Temperature: -40°C to +70°C

3. Advantages and Features

1. Comprehensive Integrated Protection

Covers essential protection for medium-voltage feeder systems, reducing the need for multiple devices.

2. Excellent Communication Capability

Supports IEC 61850, DNP3, and Modbus for smart substation integration.

3. High Reliability and EMC Immunity

Industrial-grade components ensure stable performance even under harsh electrical and environmental conditions.

4. User-Friendly Interface

• LCD display with clear menus

• PC configuration tools

• Fast access to event logs and disturbance records

5. Flexible I/O and Modular Configuration

Allows expansion and tailoring to different system requirements.

6. Strong Fault Analysis Tools

SOE, waveform recording, and fault logs provide complete diagnostic data.

4. Application Areas

REF611 is widely used in:

• Medium-voltage distribution feeders (10–35 kV)

• Industrial distribution switchgear and RMUs

• Substation automation systems

• Plant and utility feeder protection

• Power supply incoming-line protection

5. Precautions

1. Set CT/VT parameters according to actual system data.

2. Protection settings must be based on system studies and short-circuit capacity.

3. Avoid modifying logic or communication settings during operation.

4. Ensure proper grounding of the relay.

5. Export and review event logs regularly for preventive maintenance.

6. Install within the recommended temperature range.

7. Maintain stable auxiliary power to avoid unintended resets.