12.5 Calculation Formulas
207
Chapter 12 Specifications
12
* Subscript c: measurement channel, k: order being analyzed; r: resistance after FFT; i: reactance
after FFT
Harmonic voltage, current, and power (PW3360-21 only)
Wiring
setting
Item
Single-phase
2 wire
Single-phase
3 wire
Three-phase
3 wire
Three-
phase
4 wire
1P2W 1P3W 1P3W1U 3P3W2M 3P3W3M 3P4W
Voltage
U
ck
[Vrms]
U
1k
U
1k
U
2k
U
1k
U
1k
U
2k
U
1k
U
2k
U
3k
U
ck
=
• When using 3P3W3M wiring, the phase voltage is used.
• Harmonic voltage content percentage (%): U
ck
=U
ck
/U
c1
×100 (%)
Current
I
ck
[Arms]
I
1k
I
1k
I
2k
I
1k
I
2k
I
3k
I
ck
=
• Harmonic current content percentage (%): I
ck
=I
ck
/I
c1
×100(%)
Active power
P
ck
[W]
P
1k
P
1k
P
2k
P
1k
P
2k
=
-U
1kr
×I
2kr
-U
1ki
×I
2ki
P
1k
P
2k
P
1k
P
2k
P
3k
P
ck
=
U
ckr
×I
ckr
+U
cki
×I
cki
P
k
=P
1k
+P
2k
P
k
=P
1k
+P
2k
+P
3k
• Harmonic power content percentage (%): P
ck
=P
ck
/IP
c1
I × 100(%)
• Although P
1k
and P
2k
values for 3P3W2M wiring are used in internal calculations, they are
not displayed.
Reactive
power
Q
ck
[var]
Q
1k
Q
1k
Q
2k
Q
1k
Q
2k
=
-U
1kr
×I
2ki
+U
1ki
×I
2kr
Q
1k
Q
2k
Q
1k
Q
2k
Q
3k
Q
ck
=
U
ckr
×I
cki
-U
cki
×I
ckr
Q
k
=Q
1k
+Q
2k
Q
k
=Q
1k
+Q
2k
+Q
3k
• Although Q
ck
values are used in internal calculations, they are not displayed.
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