This component models a single-phase, ideal transformer that can be configured to model from five to 12 windings. Options are provided to enable a simple saturation model on a user selected winding, as well as for adding a tap changer.
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Name for Identification |
Text |
Optional text parameter for identification of the component. |
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Transformer MVA |
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REAL |
Constant |
The apparent power rating of the transformer [MVA]. |
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Base Operation Frequency |
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REAL |
Constant |
The base frequency of the electrical system, in which the transformer resides [Hz]. |
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Number of Windings |
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Choice |
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Select the number of windings, from 5 to 12. |
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Tap Changer on Winding |
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Choice |
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Select None, #1, #2... #12.
Select the winding number on which to place the on-line tap changer (or none). See On-Line Tap Changer for more details. |
Leakage ReactancesLeakage Reactances
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Leakage Reactance (#M-#N) |
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REAL |
Constant |
The leakage reactance between winding #m and #n [pu]. |
Winding Voltages and LossesWinding Voltages and Losses
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Winding # Line to Line Voltage (RMS) |
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REAL |
Constant |
[kV] |
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No Load Losses |
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REAL |
Constant |
Core losses [pu]. |
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Copper Losses of Winding # |
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REAL |
Constant |
[pu] |
NOTE: See Adjusting Saturation Properties for more details on these inputs
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Saturation Enabled |
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Choice |
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Select Yes or No to enable or disable the core saturation routine. |
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Place Saturation on Winding |
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Choice |
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Select #1, #2... #12.
See Adjusting Saturation Properties for more details. |
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Time to Release Flux Clipping |
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REAL |
Constant |
Time interval from start-up in which the model will 'clip' (limit) the calculated flux linkage values. This is simply a modelling 'trick' to prevent instability at start-up [s]. |
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Air Core Reactance |
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REAL |
Constant |
Usually approximately twice the leakage reactance [pu]. |
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Magnetizing Current |
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REAL |
Constant |
The percentage of primary winding current that flows through the transformer magnetizing susceptance. This value can be calculated based on the open-circuit test results. The magnetizing susceptance is calculated based on this value [%]. |
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Knee Voltage |
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REAL |
Constant |
The knee point voltage corresponding to the knee point of the saturation curve [pu]. |
Internal OutputsInternal Outputs
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Name for Magnetizing Current [kA] |
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REAL |
Output |
Name for the magnetizing current [kA]. |
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Name for Flux Linkage [kWb-N] |
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REAL |
Output |
Name for the calculated flux linkage [kWb-N]. |
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Name for Winding # Current |
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REAL |
Output |
Name for the specified winding current [kA]. |