Setting Up The Current Transformer Ratios And Position - ABB PQFS Installation, Operation And Maintenance Instructions

7.7.2.3 Setting up the current transformer ratios and position

The current transformers connected to the filter (units) have to be entered into the filter
system.
Two methods can be used to do this.
These approaches are discussed next.
94 The PQF-Manager user interface ç Manual Power Quality Filter PQFS
· Pressing
in the unit ratings setup menu will result into jumping to the next step
in the menu without the values entered being taken into account. When
involuntarily entering the menu, walk through the menu by pressing
repeatedly. This way the menu can be quit without modifying any values.
·
For single master units, this has to be done only for that master
·
For filter systems consisting of more than one unit, this has to be done for all the
units of the system
· Using the automatic CT detection feature
· Entering the CT ratios and positions manually
· Detection of the CT positions and ratio's using the automatic CT detection
feature:
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
o
entered by the customer
Display a warning message to wait for the identification procedure to
o
end
Check the voltage level of the DC capacitors, close the main contactor
o
and start the IGBTs
Inject a small current into the supply
o
Record the current measured by the CTs and calculate the filter CT
o
ratios and positions
Display a message indicating whether the CT identification ended
o
successfully or not
or