Class Description
Transformer star impedance (Pi-model) that accurately reflects impedance for transformers with 2 or 3 windings. For transformers with 4 or more windings, TransformerMeshImpedance class shall be used.
For transmission networks use PowerTransformerEnd impedances (r, r0, x, x0, b, b0, g and g0).
Attributes
| Name | Type | Description |
|---|---|---|
| r | Resistance | Resistance of the transformer end. |
| r0 | Resistance | Zero sequence series resistance of the transformer end. |
| x | Reactance | Positive sequence series reactance of the transformer end. |
| x0 | Reactance | Zero sequence series reactance of the transformer end. |
Relationships
Inherits from
Descendant classes
- No descendant classes
Leaf/Root class
| IsLeaf | IsRoot |
|---|---|
| False | False |
Associations
| Source Class | Cardinality Source | Target Class | Cardinality Target | Source Name | Source Assoc. Description | Target Name | Target Assoc. Description |
|---|---|---|---|---|---|---|---|
| TransformerEnd | 0..* | TransformerStarImpedance | 0..1 | TransformerEnd | All transformer ends having this star impedance. | StarImpedance | (accurate for 2- or 3-winding transformers only) Pi-model impedances of this transformer end. By convention, for a two winding transformer, the full values of the transformer should be entered on the high voltage end (endNumber=1). |
| TransformerEndInfo | 0..1 | TransformerStarImpedance | 0..1 | TransformerEndInfo | Transformer end datasheet used to calculate this transformer star impedance. | TransformerStarImpedance | Transformer star impedance calculated from this transformer end datasheet. |