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ATPDraw supports the transformer components; Ideal transformer, saturable transformer, BCTRAN and the Hybrid Transformer. The BCTRAN model is documented in chapters 5.6 and the Hybrid Model in chapter 5.7 of the Advanced Manual.
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The popup menu under Transformers contains the following items:
Selection |
Object name |
Icon |
ATP card |
Description |
Ideal 1 phase |
TRAFO_I |
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SOURCE type 18 |
Single-phase ideal transformer. |
Ideal 3 phase |
TRAFO_I3 |
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SOURCE type 18 |
3-phase ideal transformer. |
Saturable 1 phase |
TRAFO_S |
|
BRANCH TRANSFORMER |
Single-phase saturable transformer. |
Saturable 3 phase |
SATTRAFO |
|
BRANCH TRANSFORMER |
General saturable transformer. 3-phase. 2 or 3 windings. |
BCTRAN |
BCTRAN |
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BRANCH Type 1...9 |
Direct support of BCTRAN transformer matrix modeling. |
Hybrid model |
XFMR |
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BRANCH
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Winding resistance, leakage inductance, topologically correct core, capacitance. Test report, design data or typical. |
The characteristic of the nonlinear magnetizing branch of the three saturable-type transformers can be given in the Characteristic tab of the component dialog box. The saturable transformers have an input window like the one in Fig. 4.57. In this window the magnetizing branch can be entered in IRMS/URMS or IA/FLUXVs coordinates. The RMS flag on the Attributes page select between the two input formats. If the Include characteristic check box is selected on the Attributes page, a disk file referenced in the $Include field will be used in the ATP input file. If the nonlinear characteristic is given in IRMS/URMS, ATPDraw will calculate the flux/current values automatically and use them in the final ATP input file.
The BCTRAN transformer component provides direct support of BCTRAN transformer matrix modeling. The user is requested to specify input data (open circuit and short circuit factory test data) in BCTRAN supporting routine format, then ATPDraw performs an ATP run to generate a punch-file that is inserted into the final ATP-file describing the circuit. The user can specify where the factory test was performed and where to connect the excitation branch. The excitation branch can be linear or non-linear. In the latter case, the nonlinear inductors must be connected to the winding closest to the iron core as external elements.
The BCTRAN dialog and the Component dialog of the Saturable 3-phase SATTRAFO differ in many ways from the input data window of other objects. A more comprehensive description of the input parameters is given in chapters 5.6 and 5.2.1 of the Advanced Manual, respectively.
The Hybrid Transformer model is based on development made by Dr. Bruce Mork and his group at Michigan Technological University. It offers both advanced and simplified usage. The XFMR dialog box and the implementation is documented in Users' Manual.