Hioki 3197 - Page 170

8.5 Calculation Formulas
162
Wiring
Configuration
Parameter
Single-
Phase
2-Wire
Single-Phase
3-Wire
Three-phase, 3-wire
Three-Phase
4-Wire
1P2W 1P3W 3P3W2M 3P3W3M
3P4W,
3P4W2.5E
Voltage Total
Harmonic
Distortion
THD
[%]
THD
UF1
THD
UF1
THD
UF2
THD
UF1
THD
UF2
THD
UF3
Current Total
Harmonic
Distortion
I THD
[%]
THD
IF1
THD
IF1
THD
IF2
THD
IF1
THD
IF2
THD
IF3
K factor
KF
KF
1
KF
1
KF
2
KF
1
KF
2
KF
3
c: Measurement channel, k: Analysis order, r: Amount of resistance after FFT, i: Amount of reactance after
FFT
THD
UFc
Uck()
2
k2=
50

U
c1
--------------------------------
100×=
THD
IFc
Ick()
2
k2=
50

I
c1
-----------------------------
100×=
KFc
k
2
I×
2
ck


k1=
50

I
2
ck
k1=
50

-----------------------------------=
Wiring
Configuration
Parameter
Single-
Phase
2-Wire
Single-Phase
3-Wire
Three-phase, 3-wire
Three-Phase
4-Wire
1P2W 1P3W 3P3W2M 3P3W3M
3P4W,
3P4W2.5E
Voltage
Unbalance
Factor
Uunb
[%]
Uunb
136
β ––
136 β –+
-----------------------------
100×=
β
U
4
12
U
4
23
U
4
31
++
U
2
12
U
2
23
U
2
31
++()
2
-------------------------------------------------=