| Function description | IEC 61850 identification | IEC 60617 identification | ANSI/IEEE C37.2 device number |
|---|---|---|---|
| Directional earth-fault protection, low stage | DEFLPDEF | Io> -> |
67G/N-1 51G/N-1 |
| Directional earth-fault protection, high stage | DEFHPDEF | Io>> -> |
67G/N-1 51G/N-2 |