Connection Of The Pqfs In 3-Wire Mode - ABB PQFS Installation, Operation And Maintenance Instructions

NOTE: The PQF active filter is not compatible with high impedance devices installed
upstream of the filter in the neutral. The PQF may refuse to start or may not function
correctly when such a device is present. For best PQF performance, these devices have
to be removed or bypassed.
6.8.1

Connection of the PQFS in 3-wire mode

Use the 3-wire connection mode for installations where there is no need for neutral
current filtering or line to neutral balancing. In this mode, the active filter can
compensate 20 individual harmonic components.
In order to connect the PQFS in 3-wire mode, follow the below guidelines:
1. Fix the filter mechanically to the wall (Cf.
2. Ensure that an appropriately selected protecting device is connected upstream and
that the power supply cables are not live
3. Remove the protective cover present at the bottom right side of the filter (Cf.
27)
Figure 27: Removing the Aluminum protective cover at the bottom side of the active filter
4. Make holes in the protective cover of appropriate section corresponding to the
power cable section used. Also make holes for the earth cable, the CT wire and any
other control wires that may be needed, e.g. for implementing remote control
functionality. When finished, slide the cover over the feeding cables and the earth
cable.
5. Connect the earth cable (Cf.
6. Connect the three power cables to the reactor terminals (Cf.
WARNING: The power cables are directly connected by the customer at the line reactor
terminals. In order to safeguard the terminals from mechanical stress, it is
recommended that the weight of the power cable is properly supported using a cable
tray or a suitable cable connection box.
Section
enclosure
Section 6.5)
Manual Power Quality Filter PQFS  Electrical design and installation 45
5.7)
Figure 28).
Figure