Operation Manual

MI 2092 Power Harmonics Analyser Section II Internal operation
17
Phase voltage crest factor
Q
U
U
x
x
x
cr
=*
max
100
[18]
Phase current crest factor
I
I
I
x
x
x
cr
=*
max
100
[19]
Additional calculation (using FFT transformation)
Phase voltage-current
angle
f = f
i
- f
u
f
i
, f
u
are calculated by FFT
VI angle for the fundamental
component
[9]
Phase voltage THD
thd
hn
h
U
U
n
U
x
x
x
=*
=
å
2
2
63
100
1
% [10]
Phase current THD
thd
hn
h
x
x
x
n
I
I
I
1
=*
=
å
2
2
63
100
% [11]
Phase voltage
individual harmonics
Hn
hn
h
U
U
U
x
x
x
=*
1
100
% [12]
Phase current
individual harmonics
Hn
hn
h
I
x
x
x
=*
I
I
1
100
% [13]
Total values
Total active power
P
P
P
P
t
=
+
+
1
2
3
W [14]
Total reactive power
Q
Q
Q
Q
t
=
+
+
1
2
3
var [15]
Total apparent power
SPQ
ttt
=+
22
VA [16]
Total power factor
Pf
P
S
t
t
t
=
[17]
In a 3j systems with a normal 3 wire connection, the following values are not available
for displaying and recording:
· Neutral conductor current
· Phase voltage-current angle
· Phase power factor