Electrical Design And Installation; What This Chapter Contains - ABB PQFS Installation, Operation And Maintenance Instructions

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6 Electrical design and installation

6.1

What this chapter contains

This chapter gives the data required for integrating the PQFS active filter successfully in
an electrical installation. It also gives electrical connection examples for popular filter
options.
WARNING: The PQFS is able to operate on networks in a voltage range 208-240 V and
380-415 V with a tolerance range of +/- 10 % (inclusive of harmonics but not
transients). Since operation at the upper limits of voltage and temperature may
reduce its life expectancy, the PQFS should not be connected to systems for which it
is known that over voltages will be sustained indefinitely. Excessive voltage levels may
lead to filter damage.
WARNING: The PQFS is not designed to be connected to systems where one phase
serves as neutral. Connection of a PQFS to such a system is only authorized after
explicit approval by ABB.
The active filter must be connected to the network in parallel with the loads.
WARNING: The PQFS does not incorporate protective power line fuses or main
contactor. Hence the customer has to ensure that the feeding cables to each filter
panel are adequately protected taking into account the filter rating and the cable
section used. More information on this topic is presented in
Basic filter functionality can be obtained after connection of:
−
Ground (PE) (per cubicle).
−
Four power cables including neutral. The neutral connection is not mandatory for
filtering three phase loads. The power lines must be protected by appropriately
sized fuses or a contactor.
−
3 CTs (one per phase, to be connected to each filter unit in a filter system through
a daisy chain method with return path).
More advanced filter features (e.g. external monitoring of the filter status) require some
more connections. The connections for these advanced features have to be made on the
PQF-Manager.
WARNING: Ensure that the filter supply is isolated upstream during filter installation.
If the system has been connected to the supply before, wait for 25 mins after
36 Electrical design and installation  Manual Power Quality Filter PQFS
Section 6.7.