ABB PQFA, Instruction Manual

Page: 32 / 98

PQFA Instructions Manual
Asea Brown Boveri Jumet S.A.
32
If single core cables are used an alloy gland plate is recommended.
Cable terminals dimensions are shown hereafter.
6.3. Current transformers/control cables selection
Three CT’s are needed since the PQFA monitors the three phases of the
network.
The proper operation of the PQFA does not require any special CT’s. The
requirements are minimum:
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5A of secondary
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15 VA minimum for up to 30 meters of 2.5 mm² cable
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Class 1 accuracy or better
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Ratio limit above maximum line current
In case the CT’s are shared with other loads, the VA burden shall be adapted
and the connection of the different loads (including the PQFA) must be in
series.
Twin 2.5 mm² control cable is the most suitable for this application.
In order to determine the suitable CT’s for your application, please refer to the
following chart.
Note for top cable entry PQFA: if you filter is fitted with an additional cubicle
for top cable entry, you only need one set of 3 power cables to be connected
to the busbar installed in the connection cubicle. Those cables shall be sized
as described at the beginning of this paragraph.