Size of DG | Operating Characteristics | Required Protective Relays |
Up to 25 kW | Sustained Parallel Operation | 25, 27, 59, 81O, 81U |
25 kW - 1 MW | Sustained Parallel Operation | 25, 27, 59, 81O, 81U |
1 MW - 5 MW | Sustained Parallel Operation | 25, 27, 59, 81O, 81U, 67, 67N |
Greater than 5 MW | Sustained Parallel Operation | 25, 27, 59, 81O, 81U, 67, 67N, 32 |