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Linear Dy5 Transformer

Purpose

Three-phase transformer in Dy5 connection.

Library

3-Phase Transformers

Description

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Implements a linear three-phase transformer with two windings in Dy5 connection using three Linear 2-Winding Transformers. The magnetization inductance Lm and the core losses Rm are modeled as linear elements. Their values are referred to the primary side.

Parameters and Dialog Box

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Leakage inductance
A two-element vector containing the leakage inductance of the primary side L1 and the secondary side L2. The inductivity is given in henries (H).
Winding resistance
A two-element vector containing the resistance of the primary winding R1 and the secondary winding R2, in ohms (_O_).
Winding ratio
The ratio n1=n2 between the number of turns of the primary and secondary winding.
Magnetization inductance
A two-element vector containing the magnetization inductance Lm and the auxiliary magnetization inductance Lrm, both in henries (H). Their value is referred to the primary side.

The auxiliary magnetization inductance Lrm is connected in series with the magnetization resistance. A value greater than 0 avoids stiff differential equations that may otherwise slow down the simulation. In order to minimize the influence on the simulation results Lrm should be significantly smaller than Lm. The default for Lrm is 0.

Magnetization resistance
The magnetization resistance Rm representing the core losses. The value in ohms (_O_) is referred to the primary side.
Initial current
A two-element vector containing the initial currents on the primary side [i1;a i1;b] in amperes (A). The currents are considered positive if flowing into the transformer. The default is [0 0 0].
Initial current
A three-element vector containing the initial currents on the secondary side [i2;a i2;b i2;c] in amperes (A). The currents are considered positive if flowing into the transformer. The default is [0 0 0].