MI 2893 / MI 2892 / MI 2885
Measurement methods
185
Positive sequence apparent power:
I
U
S
tot
3
[VA],
(23)
Positive sequence power factor:
tot
tot
tot
S
P
DPF
.
(24)
U
+
, U
-
, U
0
and
+
are obtained from unbalance calculus. See section 5.1.11 for details.
Nonfundamental phase power measurements
Standard compliance: IEEE STD 1459-2010
Nonfundamental power measurements are measured according to following equations:
Phase nonfundamental apparent power:
2
2
2
Hp
Vp
Ip
Np
S
D
D
S
[VA], p: 1,2,3
(25)
Phase current distortion power
Ip
fundP
Ip
THD
S
D
[VA], p: 1,2,3
(26)
Phase voltage distortion power:
Up
fundP
Vp
THD
S
D
[var], p: 1,2,3
(27)
Phase harmonic apparent power
Ip
Up
fundP
Hp
THD
THD
S
S
[var], p: 1,2,3
(28)
Phase active harmonic power:
fundP
p
Hp
P
P
P
[W], p: 1,2,3
(29)
Phase harmonic distortion power
2
2
Hp
Hp
Hp
P
S
D
[var], p: 1,2,3
(30)
Total nonfundamental power measurements
Standard compliance: IEEE STD 1459-2010
Total nonfundamental power quantities are calculated according to the following equations:
Total nonfundamental effective apparent power:
2
2
2
tot
tot
tot
tot
H
V
I
N
Se
De
De
Se
[VA]
(31)
270
0
+DPF
ind
Le
ad
L
a
g
+DPF
cap
-DPF
cap
-DPF
ind
180
0
90
0
0
0
+P
+
-P
+
-Q
+
+Q
+
I
II
III
IV
