5. Typical Categories of DG ≥ 10MW Large a) ≤ 1MW but > 500kW connected to distribution system voltage ≤ 15kV b) > 1MW but ≤ 10MW connected to distribution system voltage ≤ 15kV Mid-sized a) ≤ 500kW connected to distribution system voltage ≤ 15kV b) ≤ 1MW connected to distribution system voltage ≤ 15kV Small ≤ 10kW Micro Rating DG Classification
10. Two-directional Flows with DG Power flows in traditional network Power flows with distributed generation
11.
12. Protection of DG Inter-connection ANSI # Function 21 Distance 25 Synchronizing 27 Under voltage 27N Neutral under voltage 32 Directional power 40 Loss of excitation 46 Neg. seq. current 47 Neg. seq. voltage 50 Instantaneous overcurent 50N Neutral overvoltage 51N Neutral instantaneous overcurrent 51V Voltage-restrained overcurrent 59 Overvoltage 59I Instantaneous overvoltage 59N Neutral overvoltage 60FL Voltage transformer fuse failure 67 Directional overcurrent 79 Reclosing 81 Frequency (under and over) 81R Rate of change of frequency 87 Differential LOM Loss of mains