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