Simulator 16 User Guide - PowerWorld

Transformer Impedance Correction Tables Dialog
The Transformer Correction Tables Dialog is used to view information about the transformer
impedance correction tables. These tables are used on some LTC or phase shifting transformers to
model the impedance of the transformer as a function of the off-nominal turns ratio or phase shift.
The dialog has the following fields:
Transformer Impedance Correction Table Number
Number of the impedance correction table, between 1 and 63. Use the spin button immediately to
the right of this field to step through the list of defined tables. If you have made changes to a
particular table, you must click Save before moving to another correction table; otherwise, your
changes will be lost.
Table Name
The name assigned to the table.
Table Entries
Used to insert/edit/delete the actual entries in the impedance correction table. In the first row, enter
either an off-nominal turns ratio for an LTC transformer, or a phase shift in degrees for a phase
shifting transformer. The entries in the first row must be entered in strictly ascending form. In the
second row, enter the scale factor to apply to the transformer impedance. The transformer's nominal
impedance is multiplied by the scale factor to obtain the actual value. Note that at least two columns
must be used.
Right-click on the table to invoke its local menu, which allows you to delete and to insert columns.
To insert a new column, click on the column before which you want to insert a new column and
select Insert New Point from the local menu. To delete a column, position the cursor on the
column you want to delete and select Delete Point.
Table is Used by the Following Transformers
Lists all the transformers in the case that use this impedance correction table. A single table may be
used by any number of transformers. To associate a table with a transformer, use the Transformer
AVR Dialog for LTC transformers or the Transformer Phase Shifting Dialog for phase shifters.
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