ABB REF 601 Feeder Protection and Control Relay

Product Description

The ABB REF 601 feeder protection and control relay is a compact, pre-configured device from the Relion 605 series. It is specifically designed for medium-voltage applications in utility substations and industrial power systems. Supporting both Rogowski coil sensor technology and conventional current transformers (CTs), it provides versatile protection and control functionality.

Technical Specifications

• Product Version: 2.0

• Nominal Input Voltage: 24–240 V AC/DC

• Sensor Inputs: 3 Rogowski coil inputs

• Earth Fault Input: 1 core balance CT input (1 A)

• Binary Inputs: 4 (remote trip, reset, close, open)

• Binary Outputs: 2 trip, 2 signaling, 1 breaker close, 1 unit ready/IRF

• Mounting Depth: 102 mm

• Weight: 1.2 kg

• Communication Protocols: Modbus RTU, IEC 60870-5-103

• Interface: RS485 (2-wire)

• Protection Class: IP42 (front), IP20 (sides)

• EMC Compliance: IEC 60255-26, EN 50263

• Safety Standards: EN 60255-27, EN 60255-1

• RoHS Compliance: Yes

Functional Highlights

• Overcurrent Protection: Three-stage (low, high, very high)

• Earth-Fault Protection: Two-stage (low, high)

• Transformer Inrush Detection: Second harmonic blocking method

• Negative Phase Sequence Protection: Detects imbalance and discontinuity

• Circuit Breaker Failure Protection: Ensures system reliability

• Thermal Overload Protection: For feeders, cables, and transformers

• Auto-Reclose Functionality: Multi-shot capability

• Trip Circuit Supervision: Monitors breaker trip circuits

• Configurable Logic Gates: Flexible system integration

• Event Logging & Fault Recording: Non-volatile memory storage

Application Scenarios

• Medium-voltage feeder protection in utility substations

• Industrial power distribution systems requiring compact relay solutions

• Systems using Rogowski coil sensors or conventional CTs

FAQ

Q: Does the REF601 support both Rogowski coils and CTs?  A: Yes, it is compatible with Rogowski coil sensors and conventional current transformers.

Q: What communication protocols are available?  A: The relay supports Modbus RTU and IEC 60870-5-103 via RS485 interface.

Q: How is transformer inrush detected?  A: The relay uses second harmonic blocking to distinguish inrush currents from faults.