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Key Technical Specifications
| Parameter | Value |
|---|---|
| Brand | ABB |
| Model | REF620E-1G NBFNAANNNEA1BNF11G (Relion 620 series) |
| Product family | Relion® 620 series, feeder protection and control library. |
| Device type | Numerical feeder protection and control IED library. |
| Typical application | MV feeder protection for overhead lines, cable feeders, and busbar systems in utility/industrial library. |
| Protection functions (typical) | Multi-stage phase OC, earth-fault, voltage and frequency, thermal overload, breaker failure, arc flash, HIZ fault detection (feature set depends on order code) library. |
| Communication protocols | IEC 61850, plus options such as IEC 60870-5-103, Modbus, DNP3, etc., depending on configuration library. |
| Design | Draw-out relay with plug-in unit and ring-lug terminals for all I/Os library. |
| Output performance | High-speed binary outputs, typical operate time < 1 ms for trip signals library. |
| Measurement functions | Three-phase current, voltage, power, energy, power factor, frequency, fault location, PQ metrics library. |
| HMI | Large LCD LHMI with programmable push-buttons and LEDs library. |
| Mounting | Flush-mounted in switchgear panel or relay compartment; draw-out chassis library. |
| Environmental / standards | Designed to EN/IEC 60255 series, EMC directive 2014/30/EU, LVD 2014/35/EU |
| System voltage range | Medium-voltage feeder applications; CT/VT ratios configurable in settings library. |
- REF620E-1G NBFNAANNNEA1BNF11G
4. Product Introduction
The ABB REF620E-1G NBFNAANNNEA1BNF11G is a configured variant of the REF620 feeder protection and control relay from the Relion 620 series, used for protection, control, measurement, and supervision of medium-voltage feeders in utility and industrial distribution systems. It integrates main feeder protection, breaker control, and measurement into a single draw-out IED, fitting typical single-breaker, 1.5-breaker, or double-breaker feeder schemes.new.
This unit is typically selected when you need IEC 61850-based feeder protection with fast trip outputs, flexible logic, and enough I/O to handle modern MV switchgear schemes. Compared with older electromechanical or early numeric relays, REF620 reduces panel space, simplifies wiring changes with its plug-in design, and provides richer disturbance recording and remote access for commissioning and fault analysis.library.
5. Troubleshooting Quick Reference
This is the “3:00 AM at the substation” view: is the REF620E-1G really dead, or is it a CT, VT, wiring, or settings problem?
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Front display completely dark | Loss of DC control voltage, blown DC fuse, or failed relay PSU | ✅ High | Measure DC at relay supply terminals; check panel fuses and DC distribution | If DC is missing, fix supply first; if rated DC is present and relay stays dead, schedule relay replacement. |
| Relay powers but shows “VT/CT mismatch” | Incorrect CT/VT ratios or wiring, wrong configuration group | ⚠️ Medium | Compare settings vs. single-line, verify CT/VT wiring and polarity | Correct wiring and settings before blaming the IED; replace only if errors persist with correct configuration. |
| Trips not issued during faults | Protection disabled, outputs not mapped, or bad trip wiring | ⚠️ Medium | Check protection function enable flags and output matrix; monitor binary output status in test | Fix logic and wiring first; if outputs do not change even in test injections, suspect relay hardware. |
| Spurious trips with no actual fault | Wrong CT polarity, incorrect settings, induced voltages, or noise | ⚠️ Medium | Review disturbance records and event lists; confirm CT phase rotation and grounding | Adjust CT wiring and settings; replace relay only if internal self-tests or diagnostics indicate hardware fault. |
| Cannot communicate via IEC 61850 | Wrong IP, VLAN/firewall, disabled protocol, bad port | ❌ Low | Check IP/subnet in LHMI, ping test from engineering laptop, verify 61850 server is enabled | Treat this as a configuration/network issue unless port LEDs and internal self-tests indicate a physical fault. |
| Relay in “internal fault” state | Self-detected hardware or firmware error | ✅ High | Read fault code in LHMI/web/PC tool; consult ABB documentation for that internal error | After confirming DC quality, consider firmware update; if fault persists, plan a draw-out replacement. |
| Measured currents/voltages zero | CT/VT secondary open, blown fuse, wrong terminal connections | ❌ Low | Measure CT/VT secondary circuits, check terminal tightness and fuses | Fix CT/VT circuits; rarely a relay issue unless terminals or internal A/D show clear damage or self-test errors. |
If you are unsure, pull the disturbance and event records, take photos of the LHMI alarms and wiring terminals, and send them along with your one-line diagram and setting files to your protection engineer before ordering a replacement.
6. Frequently Asked Questions (FAQ)
Q1: What is the ABB REF620E-1G NBFNAANNNEA1BNF11G actually protecting?
It is a configured REF620 feeder relay variant used as the main protection and control IED for medium-voltage feeders and, in some schemes, associated busbar sections. It handles overcurrent, earth-fault, voltage, and frequency functions, plus breaker control and supervision according to the option code.library.
Q2: Is this variant a direct replacement for any REF620?
No, REF620 variants differ by hardware, I/O, and firmware option sets encoded in the order code string (for example NBFNAANNNEA1BNF11G). You need to match both the base type REF620E-1G and the options to the existing relay’s type label and the project documentation before treating it as a direct drop-in.techdoc.relays.
Q3: Which communication protocols does this unit support?
REF620 supports IEC 61850 as a core feature, and depending on the ordered configuration can also support protocols such as IEC 60870-5-103, Modbus, and DNP3 for integration into various SCADA systems. To know exactly what your relay supports, check the communication option code in the order string and the protocol lists in the product guide.library.
Q4: Can I hot-swap the relay plug-in unit while the system is live?
The draw-out design allows replacing the plug-in unit without disturbing most of the hard-wired CT/VT and trip circuits, and the base normally provides CT shorting during withdrawal. That said, you should always follow your utility/plant switching procedures, isolate the feeder, and make sure all trip paths are in a safe state before pulling the unit, because an error here can cause unintended trips or leave a feeder unprotected.library.
Q5: Will I lose settings and recordings if I replace the plug-in unit?
Settings, disturbance records, and recorded data reside in the relay electronics, so swapping the plug-in unit will not automatically carry them over unless you restore a saved configuration. Before you pull a relay, export the configuration and disturbance files with PCM600 (or your chosen tool), and keep a copy on your engineering laptop or server so the replacement unit can be loaded quickly.library.
Q6: Is REF620 considered current technology or legacy now?
REF620 is part of the Relion 620 series, which ABB still positions for modern feeder protection and control applications and continues to support with current product guides and firmware updates. That said, you will find multiple firmware and hardware revisions in the field, so always align firmware, communication options, and settings templates when replacing units.library.
Q7: Why is one REF620E-1G unit cheaper than another with a similar code?
Price differences usually come from condition (new original vs. new surplus vs. refurbished) and from option content in the order code, such as communication cards and advanced protection features. Refurbished units are often ex-service, cleaned, tested, and sold with a shorter warranty, while new original units command a premium due to full traceability and longer warranty coverage.
