ABB REF611 Feeder Protection Relay

The ABB REF611 Feeder Protection Relay is a member of the ABB Relion® 611 series, designed specifically for the protection, control, measurement, and supervision of overhead lines and cable feeders in distribution networks. Built with the latest IEC 61850 standard for substation communication, REF611 ensures high interoperability and reliability in both simple and complex power systems. It provides a compact and cost-efficient solution for medium-voltage applications, integrating advanced protection functions with monitoring and control features.

Its modular design and user-friendly interface make it suitable for new installations as well as retrofit projects. The REF611 is equipped with a range of configurable protection schemes including overcurrent, earth-fault, phase unbalance, and thermal overload protection, making it highly adaptable to different distribution system requirements.

Product Specifications

Product Applications

The ABB REF611 Feeder Protection Relay is widely used in medium-voltage distribution networks for safeguarding overhead lines and cable feeders. It is ideal for:

• Primary and Secondary Substations: Provides complete feeder protection for distribution systems.

• Industrial Power Systems: Ensures reliable protection in industrial plants with complex network topologies.

• Renewable Integration: Suitable for feeder protection in wind and solar power distribution systems.

• Retrofit Projects: Compact design allows easy replacement of outdated relays without major panel modifications.

Product Advantages

• Comprehensive Protection: Offers multiple protection functions in one device, reducing the need for additional relays.

• Advanced Communication: IEC 61850 support ensures seamless integration with modern SCADA and substation automation systems.

• High Reliability: Robust design with wide temperature range and strong EMC performance.

• User-Friendly Interface: Intuitive LCD display and customizable logic configuration make setup and monitoring simple.

• Compact and Modular: Fits into small panels and supports easy expansion of functionality through software upgrades.

• Event and Disturbance Recording: Helps in efficient fault analysis and improves system reliability.

FAQ

1. What types of overcurrent protection does the REF611 provide?

   The REF611 supports both phase overcurrent and directional/non-directional earth-fault protection with configurable curves.

2. Can the REF611 be integrated into IEC 61850-based substation automation systems?

   Yes, it fully complies with IEC 61850 standards and supports GOOSE messaging for fast data exchange.

3. Does the REF611 support dual current transformer inputs?

   Yes, it can be configured for both 1 A and 5 A CT secondary ratings.

4. What is the typical trip time accuracy for the REF611?

   It provides a high-precision trip time accuracy of less than ±3% depending on the selected characteristic.

5. Can the REF611 perform thermal overload protection for feeders?

   Yes, it includes an I²t-based thermal overload function for protecting cables and transformers from overheating.

6. What kind of event and disturbance recording is available?

   It supports up to 1024 event logs and 10 waveform disturbance records with precise time-stamping via SNTP.

7. Is the REF611 capable of phase unbalance detection?

   Yes, it provides negative-sequence current detection for unbalanced load protection.

8. What redundancy options are available for communication?

   The REF611 supports redundant Ethernet ports with RSTP for reliable network operation.

9. Does the REF611 support remote firmware updates?

   Yes, firmware can be updated remotely via the PCM600 configuration tool.

10. Can the REF611 be used in isolated neutral networks?

    Yes, it can be configured for various neutral grounding methods, including isolated and resistance-earthed systems.