Power Quality Analyzer Model 3945
81
8.1.4 Peak Factors for Current and Voltage
[]
[]
[]
[][ ]
∑
−
=
⋅
=
1
0
2
1
)
i
Vpm
,
i
max(Vpp
Vcf
NSC
n
n
i
V
NSC
i
Peak factor single voltage i + 1 phase
[]
[]
[]
[][ ]
∑
−
=
⋅
=
1
0
2
1
)
i
Upm
,
i
max(Upp
Ucf
NSC
n
n
i
U
NSC
i
Peak factor phase-phase voltage i + 1 phase
[]
[]
[]
[][ ]
∑
−
=
⋅
=
1
0
2
1
)
i
Apm
,
i
max(App
Acf
NSC
n
n
i
A
NSC
i
Peak factor current i + 1 phase
8.1.5 1 sec RMS values for voltage and current
[]
[][ ]
∑
−
=
⋅
=
1
0
2
1
Vrms
NSS
n
n
i
V
NSS
i
Single rms voltage i + 1 phase
[]
[][ ]
∑
−
=
⋅
=
1
0
2
1
Urms
NSS
n
n
i
U
NSS
i
Compound rms voltage i + 1 phase
[]
[][ ]
∑
−
=
⋅
=
1
0
2
1
Arms
NSS
n
n
i
A
NSS
i
Rms current i + 1 phase
NSS: number of samples in a second (multiple of NSAMPER)
8.1.6 Voltage and Current Unbalance
=
V
+
(VF[0] + a VF[1] + a
2
VF[2]) Direct voltage (complex notation a = e )
1
3
j 2
π
3
=
V
-
(VF[0] + a
2
VF[1] + a
VF[2]) Reverse voltage
1
3
Vrms
-
Vrms
+
Arms
-
Arms
+
Vunb =
, Aunb =
