Appendix A: Mathematical Formulas; Half-Period Voltage And Current Rms Values; Min / Max Values For Voltage And Current - AEMC 8335 User Manual

Half-period Voltage and Current RMS Values

[]
Vdem i =
NSHC
[]
i
Udem =
NSHC
[]
Adem i =
NSHC
NSHC: number of samples per half cycle (between two consecutive zeros)
n: sample (0; 255)
i: phase (0; 1; 2)

MIN / MAX Values for Voltage and Current

Vmax[i] = max (Vdem[i]), Vmin[i] =min (Vdem[i]), Vavg=1/6000 Σ Vdem[i]
Umax[i] = max (Udem[i]), Umin[i] =min (Udem[i]), Aavg=1/6000 Σ Adem[i]
Amax[i] = max (Adem[i]), Amin[i]=min (Adem[i]) (Avg calculation on 1s)
92
APPENDIX A
MATHEMATICAL FORMULAS
FOR VARIOUS PARAMETERS
1 Next Zero
[][ ]
∑
⋅ V i
n Zero
:
1 Next Zero
[][ ]
∑
U i
⋅
n : Zero
1 Next Zero
[][ ]
∑
⋅ A i
n : Zero
2
n
Single rms voltage half-period i + 1 phase
2
n
Compound rms voltage half-period i + 1 phase
2
n
Rms current half-period i + 1 phase
Power Quality Analyzer Model 8335