ABB REF620 – NBFNAAAABEC1BNN1XF Line Protection Relay

Basic Information

Full Order Code: REF620‑NBFNAAAABEC1BNN1XF Product Series: Relion® 620 Device Type: Feeder Protection and Control IED (Feeder Protection Relay) Application: 6‑35kV MV switchgear feeder protection, suitable for cable feeders, overhead lines, plant auxiliary power, distribution substations and distributed generation interconnection systems.

Mechanical Structure: Withdrawable plug‑in unit, panel mount, 3U form factor Auxiliary Power Supply: 110‑240V AC/DC wide range, no backup battery Current Input: 1A / 5A CT secondary configurable Rated Frequency: 50/60Hz I/O Configuration: Digital inputs & outputs; expandable with RIO600 remote I/O Communication Interface: Dual Ethernet for IEC61850, RS485; supports Modbus RTU, DNP3, IEC60870‑5‑103 Display Unit: Graphical LCD, single‑line diagram support, local keypad operation Configuration Tool: PCM600 Weight: Approx. 3.2 kg Lifecycle: REF620 series discontinued by OEM. Only spare‑parts supply available, no new original orders.

Main Protection Functions

1. Phase Overcurrent Protection (Definite‑time / Instantaneous) 50/51
2. Directional Phase Overcurrent Protection 67
3. Earth‑Fault, Directional Earth‑Fault & Sensitive Earth‑Fault Protection 50N/51N, 67N
4. Thermal Overload Protection 49
5. Over‑voltage / Under‑voltage Protection 59/27
6. Frequency Protection 81 (Overfrequency, Underfrequency, ROCOF)
7. Three‑pole Multi‑shot Auto‑reclosing 79
8. Circuit‑Breaker Failure Protection 50BF
9. Negative Sequence Overcurrent Protection 46
10. High‑Impedance Fault (HIZ) protection, Cable Fault Detection (CFD)

Monitoring & Recording Functions

• Sequence of Event Recorder (SER)
• Digital Fault Recorder (DFR) with high sampling rate
• Circuit Breaker Condition Monitoring, Trip Circuit Supervision
• Electrical measurement, local & remote alarm reporting

Compatibility Notes

1. Full order code NBFNAAAABEC1BNN1XF must be exactly matched. Devices with different I/O, firmware or function packages cannot be directly interchanged.
2. Successor model: REF620E‑F. Hardware is not plug‑and‑play compatible, full engineering re‑configuration is required.
3. Supports IEC61850 GOOSE messaging, compatible with MicroSCADA and third‑party substation SCADA systems.
4. Remote I/O expansion supported via RIO600.