Description
3. Key Technical Specifications
- Rated Current Inputs: 1/5 A configurable
- Rated Voltage Inputs: Standard VT inputs (100-240 V range typical)
- Auxiliary Power Supply: 24-265 V DC / 100-240 V AC
- Communication Protocols: IEC 61850 (Edition 2 support), Modbus, DNP3, IEC 60870-5-103
- Protection Functions: Directional/non-directional overcurrent, sensitive earth-fault, thermal overload, frequency, voltage protections
- Operating Temperature: -25°C to +55°C (standard)
- Dimensions (W x H x D): Approx. 246 mm x 160 mm x 201 mm (case)
- Weight: Approx. 2.8 kg (plug-in unit)
- Binary I/O: Configurable inputs and outputs (high-speed options available)
- Event/Disturbance Recording: Built-in sequence of events and fault recording
- Design: Withdrawable unit for easy maintenance
- Mounting: Panel or rack installation
4. Product Introduction
The ABB REF620 NBFNAANNNDA1BBN1XF is a dedicated feeder management relay in the Relion 620 series. It delivers integrated protection, control, measurement, and supervision for medium voltage distribution feeders in utility substations and industrial plants, including networks with distributed generation.
This configuration supports conventional instrument transformers and provides a full suite of protection functions such as overcurrent, directional earth-fault, and voltage elements. Its withdrawable design and IEC 61850 communication make it a practical choice for both new installations and direct replacements.
- REF620 NBFNAANNNDA1BBN1XF
- REF620 NBFNAANNNDA1BBN1XF
- REF620 NBFNAANNNDA1BBN1XF
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No power / blank display | Auxiliary voltage missing | Low | Measure 24-265 V DC or 100-240 V AC at power terminals | Verify supply voltage and fuses before replacing IED |
| Incorrect measurements | Wrong CT/VT ratio or wiring | Medium | View analog values on HMI or PCM600 | Confirm scaling parameters match installed transformers |
| Nuisance or no trip | Protection settings or blocking | High | Review event log and disturbance recorder | Export records; validate active setting group and function enables |
| Loss of station communication | Ethernet/fiber issue or config | Medium | Check link status and ping from station computer | Verify IP settings, PRP/HSR if used, and cable integrity |
| Self-supervision or internal fault | Hardware or firmware issue | High | Note specific alarm code on HMI | Power cycle; provide diagnostic logs to support if it repeats |
| Unstable operation | Loose terminals or grounding | Low | Inspect all wiring and torque | Reseat connections; confirm proper shielding and grounding |
Always rule out field wiring and upstream devices first. Send HMI screenshots, event logs, and COMTRADE files when contacting support.
6. Frequently Asked Questions (FAQ)
Is this unit new original stock? Yes, offered as New Original / New Surplus with traceability. It has passed our inbound verification and functional testing.
Does it support hot-swapping? No. Shut down and isolate the circuit before swapping the withdrawable unit. This prevents backplane stress or unintended operations.
What communication protocols are included? It includes IEC 61850 with GOOSE, plus Modbus, DNP3, and IEC 60870-5-103. Confirm the exact ordering code matches your SCADA requirements.
How do I check or update the firmware? We record the installed firmware version in the test report. Use ABB PCM600 for reading and updates. Match firmware to your existing system to avoid compatibility problems.
Will this serve as a drop-in replacement? It works as a direct replacement within the REF620 family, but verify I/O configuration, firmware revision, and protection settings. Photograph the old unit’s jumpers and settings before removal.
What warranty applies? Standard 1-year warranty covering manufacturing and functional defects under normal use. Contact us for project-specific extensions.
Why choose surplus over new factory order? You get immediate availability and the same performance at a lower cost. Every unit goes through full visual, electrical, and functional testing on a compatible rack with a signed test report provided. Photos and videos available on request.
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