ABB PQFM Instruction Manual page 171

Supply side
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.
Supply side
Figure 98: Connection of the scopemeter for checking the CT in phase L1 by
L1 K L
K L
L2
L3
I k
I k
Positi ve direction
Positive direction
L1 K L
K
L2
L3
I k
I
Positive direction
comparing the currents
Manual Power Quality Filter PQFM ç The PQF-Manager user interface 171
K L
I k
L1 L2 L3
X21.1
X21.2
X21.3
X21.4
PQF
X21.5
X21.6
X21.7
X21.8
X21.9
Ch1 Ch2
L
K L
k
I k
L1
X21.1
X21.2
X21.3
X21.4
X21.5
X21.6
X21.7
X21.8
X21.9
Ch1 Ch2
Load side
Figure 98.
Load side
L2 L3
PQF