Description
Transformer models with tap changer are designed to be used when the voltage needs to be set. This is often the case with electronic power converters. The 4-winding linear transformer is best used when the simulation of saturation can be avoided as it can save computation time.
Mask and Parameters
General Parameters
| Description | Use this field to add all kinds of information about the component |
| Base primary/secondary/tertiary/quaternary winding voltage (rmsLN) | Base value pour PU conversion (kV) |
| Base power (total) | Base value pour PU conversion (MVA) |
| Base frequency | Base value pour PU conversion (Hz) |
Magnetization Impedance Parameters
- Rm: Equivalent resistance of iron losses of the magnetic circuit (Ω)
- Lm: Magnetization inductance (H)
Winding Parameters
| Voltage (rms) | Rated voltage of the winding (kV) |
| R1, R2, R3, R4 | Leakage resistance of the winding (Ω) |
| L1, L2, L3, L4 | Leakage inductance of the winding (H) |
Tap Changer Parameters
The tap changer effect is simulated by changing the transformer ratio.
| Control type | Source of the command Internal (control model): The parameter "Manual tap position" defines the set point for the tap. It is reached after the temporization and operation times. External (input pins): The parameter "Manual tap position" defines the initial value of the tap and is not used thereafter. The temporization and operation times apply to the external control. |
| Manual position | Manual position required; either a set point or initial value depending on the control type |
| Number of taps | Number of tap(s); maximum 50 |
| Nominal tap | Tap position at which nominal values are set |
| Tap size (% of base voltage) | Tap voltage increment value in reference to the primary base voltage (%) |
| Temporization time | Minimum duration required for a signal order to start changing tap (s) |
| Operation time | Time between tap changes (s) |
Ports, Inputs, Outputs and Signals Available for Monitoring
Ports
| Net_1+ | Positive primary winding connection (supports only 1-phase connections) |
| Net_1- | Negative primary winding connection (supports only 1-phase connections) |
| Net_2+ | Positive secondary winding connection (supports only 1-phase connections) |
| Net_2- | Negative secondary winding connection (supports only 1-phase connections) |
| Net_3+ | Positive tertiary winding connection (supports only 1-phase connections) |
| Net_3- | Negative tertiary winding connection (supports only 1-phase connections) |
| Net_4+ | Positive quaternary winding connection (supports only 1-phase connections) |
| Net_4- | Negative quaternary winding connection (supports only 1-phase connections) |
Inputs
- U: "Up" control input; changes one position
- D: "Down" control input; changes one position
Outputs
- Pos: Tap position
Sensors
| D | "Down one position" order from control input or internal command |
| ILMAG | Magnetization current (A) |
| IPRIM | Primary current (A) |
| ISEC2 | Secondary current (A) |
| ISEC3 | Tertiary current (A) |
| ISEC4 | Quaternary current (A) |
| Tap | Tap position |
| U | "Up one position" order from control input or internal command |