Electrical Interconnection Of Pqfs Enclosures - ABB PQFS Installation, Operation And Maintenance Instructions

Note that this cable must be able to withstand three times the secondary current rating
of the CTs. Note that this cable must be able to withstand three times the secondary
current rating of the CTs.
Supply side
K = P1, L = P2, k = S1, l = S2
Figure 35: Four wires CT wiring approach that may be used with a single unit
In case a filter system consists of more than one unit, all units have to be supplied with
the CT measurement information. This is done by cabling the CTs in a daisy chain fashion
between the different units. This is illustrated in Section 6.11.3.

6.11 Electrical interconnection of PQFS enclosures

This section explains how to electrically interconnect different PQFS enclosures.
Figure 36 shows schematically which interconnections have to be made between two
filter enclosures.
52 Electrical design and installation  Manual Power Quality Filter PQFS
L1 K L
K
L2
L3
N
To X21.5
To X21.2
PQFS active filter
L
K L
To X21.8
L1
N
X21.1
X21.2
X21.3
X21.4
X21.5
X21.6
X21.7
X21.8
X21.9
Load side
L2 L3
PQF