Appendix; Mathematical Formulas For Various Parameters; Half-Period Voltage And Current Rms Values; Min / Max Values For Voltage And Current - AEMC PowerPad 3945 User Manual

8.1 Mathematical Formulas for Various Parameters

8.1.1 Half-period Voltage and Current RMS Values

[]
=
Vdem
i
[]
=
Udem i
[]
=
Adem i
NSC: number of samples by cycle
n: sample (0; 255)
i: phase (0; 1; 2)

8.1.2 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)

8.1.3 Peak Values for Voltage and Current

Vpp[i] = max (V[i]][n]), Vpm[i] = min (V[i][n]), n
Upp[i]= max (U[i]][n]), Upm[i] = min (U[i][n]), n
App[i]= max (A[i][n]), Apm[i] = min (V[i][n]), n
80
C
A
Next Zero
2
∑
⋅
V
NSC
n : Zero
Next Zero
2
∑
⋅
U
NSC
:
n Zero
Next Zero
2
∑
⋅
A
NSC
n : Zero
8
HAPTER
PPENDIX
[][ ]
2
i n
Single rms voltage half-period i + 1 phase
[][ ]
2
i n
Compound rms voltage half-period i + 1 phase
[][ ]
2
i n
Rms current half-period i + 1 phase
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Power Quality Analyzer Model 3945
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