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Power Quality Analyzer Model 3945-B
APPENDIX A
MATHEMATICAL FORMULAS FOR VARIOUS PARAMETERS
NOTE the following abbreviations used in this section:
NSHC =
number of samples per half cycle (between two consecutive
zeros)
NSC =
number of samples per cycle
NSS =
number of samples in a second (multiple of NSC)
V =
voltage phase to neutral
U =
voltage phase to phase
Half-period Voltage and Current RMS Values
Half-cycle RMS phase-to-neutral voltage of phase (i+1) with i
X
[0; 2].
Half-cycle RMS phase-to-phase voltage of phase (i+1) with i
X
[0; 2].
Half-cycle RMS current of phase (i+1) with i
X
[0; 2].
To avoid missing any fault, these values are calculated for each half-cycle.