Manual Power Quality Filter PQFM
The PQF-Manager user interface 171
L1
L2
L3
Load side
Supply side
K
L
I
k
K
L
I
k
K
L
I
k
PQF
L1
L2
L3
Positi ve direction
Ch1
Ch2
X21.1
X21.2
X21.3
X21.4
X21.5
X21.6
X21.7
X21.8
X21.9
Figure 97: Connection of the scopemeter for checking CT in phase L3
8.6.2.3.3 Checking the correct connection of the CTs with two current probes
If the main bus bar is available and all security rules are taken, it is possible to use the
two-channel scopemeter in order to see if the current measured through the CT is
matching the real current in the bus. Connect the current probes as shown on
The two traces must be in phase and of the same shape (the magnitude could be
different as the gains are different) if the wiring is correct.
L1
L2
L3
Load side
Supply side
K
L
I
k
K
L
I
k
K
L
I
k
PQF
L1
L2
L3
Ch1
Ch2
Positive direction
Positive direction
X21.1
X21.2
X21.3
X21.4
X21.5
X21.6
X21.7
X21.8
X21.9
Figure 98: Connection of the scopemeter for checking the CT in phase L1 by
comparing the currents