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Power Quality Analyzer Model 3945-B
93
Different Power Levels 1 Sec
[]
[][ ]
iW
VA[i] = Vrms[i] Arms[i] Apparent power i + 1 phase
VAR[i] =
or VAR[i] = VA[i] – W[i] if computation method is with harmonics
Active power i + 1 phase
NSS-1
0
nV i
n
.
.
.
∑
=
[][ ]
nA i
=
1
NSS
[][ ]
Reactive power i + 1 phase
NSS-1
0
n - NSS / 4VF i
n
.
∑
=
[][ ]
nAF i
1
NSS
22
W[3] = W[0] + W[1] + W[2] Total active power
VA[3] = VA[0] + VA[1] + VA[2] Total apparent power
VAR[3] = VAR[0] + VAR[1] + VAR[2] Total reactive power
Ratios
PF[i] = i + 1 phase power factor
W[i]
VA[i]
DPF[i] = cos(φ[i])
i + 1 phase displacement factor
Tan[i] = tan(φ[i])
i + 1 phase tangent
PF[3] =
PF[0] + PF[1] + PF[2]
3
Total power factor
DPF[3] =
DPF[0] + DPF[1] + DPF[2]
3
Total shift factor
Tan[3] =
Tan[0] + Tan[1] + Tan[2]
3
Total tangent
cos(φ[i]) =
[][ ]
Cosine angle between voltage
fundamental and i + 1 phase current
NSS-1
0
2
niVF
[][ ]
niAF
n
∑
=
[][ ]
NSS-1
0
niVF
n
∑
=
2
[][ ]
NSS-1
0
niAF
n
∑
=
.