ABB PQFS

152 Commissioning instructions  Manual Power Quality Filter PQFS
°∗
∆
= 360
1T
T
ϕ
where T1 is the fundamental period duration.
For an inductive and non-regenerative load, the current signal should lag the voltage by
a phase shift lower than 90°.
Figure 77: Phase shift evaluation between two waveforms
8.6.2.3.2 Measurement of the CT in phase L2 and L3 (Figure 78 and Figure 79)
The same operations as those described in the previous paragraph must be repeated
with the phase L2 (Figure 78) and phase L3 (Figure 79).
For a balanced load (which is usually the case in most of the three phase systems), the
phase shift should be approximately the same for all the three phases.
L1
L2
L3
Load side
Supply side
K
L
I
k
K
L
I
k
K
L
I
k
PQF
L1
L2
L3
Positive direction
Ch1
Ch2
N
N
X21.1
X21.2
X21.3
X21.4
X21.5
X21.6
X21.7
X21.8
X21.9
Figure 78: Connection of the scopemeter for checking CT in phase L2
∆T
T
1
U
I1