| Function description | IEC 61850 identification | IEC 60617 identification | ANSI/IEEE C37.2 device number |
|---|---|---|---|
| Three-phase directional overcurrent protection, low stage | DPHLPDOC | 3I> -> | 67P/51P-1 |
| Three-phase directional overcurrent protection, high stage | DPHHPDOC | 3I>> -> | 67P/51P-2 |