ABB PQFS Installation, Operation And Maintenance Instructions page 153

Figure 79: 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.
Figure 80: Connection of the scopemeter for checking the CT in phase L1 by
L1 K
L2
Supply side
L3
I
N
L1 K
L2
Supply side
L3
I
N
comparing the currents
L
K L
K L
k
I k
I k
Positive direction
Ch1
Positive direction
L
K L
K
k
I k
I
Positive direction
Manual Power Quality Filter PQFS  Commissioning instructions 153
Load side
N L1 L2 L3
X21.1
X21.2
X21.3
X21.4
PQF
X21.5
X21.6
X21.7
X21.8
X21.9
Ch2
L
k
N L1 L2 L3
X21.1
X21.2
X21.3
X21.4
PQF
X21.5
X21.6
X21.7
X21.8
X21.9
Ch1 Ch2
Figure 80.
Load side