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compensation and balancing. After the procedure has finished, the user has to
reprogram these parameters into the filter.
8.6.2
Manual CT detection procedure
Refer to
Section 7.9.2.3.2
setup.
The following procedure will allow you to check the CT connection. This step only has to
be executed if the CT setup could not be detected automatically. For filters consisting
of more than one unit, it is necessary to check the CT connections for each individual
unit.
WARNING: The secondary circuit of a loaded CT must never be opened. Otherwise
extremely high voltages may appear at its terminals which can lead to physical danger
or destruction of the CT.
8.6.2.1 PQF connection diagram
Figure 73
shows the standard connection diagram for the PQF (Cf.
be noted that:
−
L1, L2 and L3 rotation must be clockwise.
−
The CTs must be on the supply (line) side of the PQF.
−
The CT monitoring a phase must be connected to the filter CT terminal dedicated
to the same phase.
−
One secondary terminal of the CT must be earthed.
Supply side
K = P1, L = P2, k = S1, l = S2
It is also seen that terminal X21.1 and X21.2 are related to the CT located in phase L1,
terminal X21.4 and X21.5 are related to the CT located in phase L2 and terminal X21.7 and
X21.8 are related to the CT located in phase L3.
for guidelines on how to enter data when using the manual CT
L1
K
L
K
L2
L3
k
l
N
k
l
To X21.1/X21.2
To X21.4/X21.5
Figure 73: Basic CT connection diagram
Manual Power Quality Filter PQFS Commissioning instructions 149
L
K
L
k
l
To X21.7/X21.8
N
L1
L2
X21.1
X21.2
X21.3
X21.4
PQF
X21.5
X21.6
X21.7
X21.8
X21.9
Section
7.9.1). It must
Load side
L3
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