Table 1.

Real-time processing of power quality measurements in programmable controller.

Measurements	Computed	Intervals
One-cycle fundamental power values	3-phase	1 cycle
Power values	3-phase	10 cycles
Energy values	3-phase	10 cycles
Aggregated frequency 10 s values	1-phase	10 s
Voltage RMS values	3-phase	10 cycles, 3 s, 10 s, 10 m
Current RMS values	3-phase	10 cycles, 3 s, 10 s, 10 m
Voltage underdeviation	3-phase	10 cycles, 3 s, 10 s, 10 m
Voltage overdeviation	3-phase	10 cycles, 3 s, 10 s, 10 m
Voltage events	3-phase	1 cycle
Rapid voltage changes events	3-phase	1/2 cycle
Voltage total harmonic distortion (THD)	3-phase	10 cycles, 3 s, 10 s, 10 m
Voltage unbalance factor	1 value for 3-phase	10 cycles
Fundamental voltage unbalance factor	1 value for 3-phase	10 cycles, 3 s, 10 s, 10 m
Fundamental voltage symmetrical components	1 value for 3-phase	10 cycles
Current unbalance factor	1 value for 3-phase	10 cycles
Fundamental current unbalance factor	1 value for 3-phase	10 cycles
Harmonic voltage RMS values	3-phase	10 m