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 3-winding linear transformer is best used when the simulation of saturation can be avoided as it can save computation time.

Table of Contents

Mask and Parameters

General Parameters

Description	Use this field to add all kinds of information about the component
Base primary/secondary/tertiary winding voltage (rmsLN)	Base value pour PU conversion (kV)
Base power (total)	Base value pour PU conversion (MVA)
Base frequency

Magnetization Impedance Parameters

Rm: Equivalent resistance of iron losses of the magnetic circuit (Ω)
Lm: Magnetization inductance (H)

Winding Parameters

Voltage (rmsLN)	Rated voltage of the winding (kV)
R1, R2, R3	Leakage resistance of the winding (Ω)
L1, L2, L3	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)

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)
Tap	Tap position
U	"Up one position" order from control input or internal command

3-Winding 1-Phase Linear Transformer with Tap Changer