Transformers
This section describes the general properties of all transformer components in Typhoon HIL's Schematic Editor, such as an ideal transformer, a single-phase three winding transformer, a three-phase four winding transformer, etc. There are currently 9 different transformer components in Schematic Editor.
There are eight transformers available in the library: single phase ideal transformer, single phase ideal transformer with variable transfer ration, single and three phase two winding transformers (one secondary winding), single and three phase three winding transformers (two secondary windings), single and three phase four winding transformers (three secondary windings).
Core model
Transformer core modeling is available for all transformers in the library. A transformer core model can be selected by the Core model combo box. Table 1 shows mask properties and the primary side of the transformer for all available core models. If Non-Linear is selected as the Core model property, core saturation is modeled as a nonlinear magnetizing inductance on primary side of the transformer. If Linear is selected as the Core model property, the core is modeled as a linear magnetizing inductance on the primary side of the transformer. If Lm/Rm neglected is selected as the Core model property, magnetizing inductance and resistance will be neglected. Certain transformers also have Hysteresis core model compatibility.
| Core model | Properties window | Primary side |
|---|---|---|
|
Linear |
 |
 |
|
Non-Linear / Hysteresis |
  |
 |
|
Lm/Rm neglected |
 |
 |
Hysteresis effects
Simulating hysteresis effects requires signal processing implementation. Therefore, an execution rate for hysteresis simulation must be specified. To capture this effect for an arbitrary dynamic signal, its period should be at least 20 times faster than the execution rate of hysteresis sampling, defined in Execution rate. Hysteresis is further defined through three lists/arrays which have different labels depending on the type of transformer or nonlinear inductor as shown in Figure 1.
To properly define hysteresis, the data value for both Flux values and Hysteresis flux values must be specified for the zero current data-point, which means that the first value of Current values and Flux values lists/arrays must be 0, and that the first value of the Hysteresis flux values list/array must be the remanent flux value. Secondly, all three of these properties must have the same number of elements and all three must be monotonically non-decreasing lists/arrays. Hysteresis flux values must have at least one element that is higher in value than the corresponding element in the Flux values list, followed by at least one element that has the same value as the corresponding element in Flux values. The first common element for Hysteresis flux values and Flux values is defined as the Hysteresis upper curve threshold.
Figure 2 demonstrates an example of properly defined parameter values using the settings below.
Flux values [Wb]: [0, 0.004, 0.008, 0.011, 0.013, 0.014, 0.0145, 0.015]
Current values [A]: [0, 1, 2, 3, 4, 5, 6, 7]
Hysteresis flux values [Wb]: [0.004, 0.007, 0.01, 0.012, 0.0135, 0.0141, 0.0145, 0.015]
The current version of Schematic Editor offers a selection of the following types of transformer components:
Ideal transformer with variable transfer ratio
Single phase two winding transformer
Single phase two winding variable ratio transformer
Single phase three winding transformer
Single phase four winding transformer
Three phase two winding transformer
Three phase three winding transformer
Three phase four winding transformer
Single phase multi-winding transformer
Three phase two winding variable ratio transformer
Additional information on calculation of equivalent circuit parameter values is contained in a separate section.