182
13.1 Formulae
*1: The harmonic phase angle is displayed after it is corrected
using the phase of the fundamental of the PLL synchronization/
frequency source as the reference phase (0.0°). When
U
ki
=
U
kr
= 0,
φU
k
= 0°. When
I
ki
=
I
kr
= 0,
φI
k
= 0°.
*2: Reactive power is calculated with the phase of the harmonic
component of the current lagged by 90 degrees.
*3: The calculation is performed internally and the result is not dis-
played on-screen.
Harmonic Formulae for Each Connection Method
Total har-
monic dis-
tortion-F
THD-F
[%]
-- -- THD
UF
X100 (%)
THD
IF
X100 (%)
Total har-
monic dis-
tortion-R
THD-R
[%]
-- -- THD
UR
X100 (%)
THD
IR
X100 (%)
Processing
Item
k
th harmonic
Total up to the 40th
U
k
()
2
k 2=
40
∑
U
1
-------------------------------
I
k
()
2
k 2=
40
∑
I
1
----------------------------
U
k
()
2
k 2=
40
∑
U
k
()
2
k 1=
40
∑
-------------------------------
I
k
()
2
k 2=
40
∑
I
k
()
2
k 1=
40
∑
----------------------------
k
: Harmonic order (
k
= 1 to 40),
K
:
K
= 40
r
: resistance component after FFT
i
: reactance component after FFT
Wiring
Item
Single-phase 2-wire Single-phase
3-wire
Three-phase 3-wire Three-phase
4-wire
1P2W 1P3W 3P3W2M 3P3W3M 3P4W,3P4W4I
Voltage
U
k
[Vrms]
U
1k
U
1k
U
2k
U
1k
U
2k
U
3k
*6
U
1k
U
2k
U
3k
*4
U
1k
U
2k
U
3k
Current
I
k
[Arms]
I
1k
I
1k
I
2k
I
1k
I
2k
I
3k
*5
I
1k
I
2k
I
3k
I
1k
I
2k
I
3k
I
4k
Active
power
P
k
[W]
P
1k
P
1k
+
P
2k
P
1k
+
P
2k
P
1k
+
P
2k
+
P
3k
*3
P
1k
+
P
2k
+
P
3k
Reactive
power
Q
k
[var]
*1
Q
1k
Q
1k
+
Q
2k
Q
1k
+
Q
2k
Q
1k
+
Q
2k
+
Q
3k
*3
Q
1k
+
Q
2k
+
Q
3k
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