Transformer Impedance Correction Table Display

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The Transformer Impedance Correction Display shows information about all the transformer impedance correction tables in the case. The Transformer Impedance Correction Display is used to model the change in the impedance of the transformer as the off-nominal turns ratio or phase shift angle is varied.

The impedance correction display is a class of Case Information Display and therefore can be used in a manner consistent with all other case information displays. It has a local menu from which you can print, copy, and modify its information as well as view the information dialog of its associated correction tables. When in Edit Mode, you can define new tables using the Insert option, or delete existing tables using Delete .

To show this display select Network > Impedance Correction Tables from the Model Explorer.

 

The display contains the following fields by default:

Table #, Table Name

Shows the table number and name for the record.

Transformer Impedance Scaling Factors

The rest of the default columns show the actual fields in the table. The first field of each pair shows the off-nominal turns ratio or phase shift angle and is named Tap, while the second field shows the associated scaling factor for the transformer’s impedance and is named Value. Up to 100 points are allowed for each table. To determine the appropriate scaling factor, interpolation will be used based on the current tap or phase angle.