ABB PQFS Installation, Operation And Maintenance Instructions page 109

For detecting the CT-settings automatically, go to
[/Welcome/Settings/Commissioning/Auto CT detection]
WARNING: When launching the automatic CT detection procedure, the filter will
connect to the network automatically. This may take several minutes in the case of
large multi-unit filters. During this operation (high) operating voltages will be present
in the filter unit. For personal safety reasons, close the filter cover before launching
the CT detection procedure. Also ensure that the filter CT terminals (X21) are not
shorted.
When engaging the automatic CT detection procedure the filter will execute the
following steps:
−
Deselect harmonics and reactive power/balancing settings previously entered by
the customer
−
Display a warning message to wait for the identification procedure to end
−
Check the voltage level of the DC capacitors, close the main contactor and start
the IGBTs
−
Inject a small current into the supply
−
Record the current measured by the CTs and calculate the filter CT ratios and
positions
Manual Power Quality Filter PQFS  Commissioning instructions 109