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Linear 3-Winding Transformer

Purpose

Three-winding transformer.

Library

Passive Components

Description

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This transformer models three coupled windings on the same core. The magnetization inductance Lm   and the core loss resistance Rm   are modeled as linear elements. Their values are referred to the primary side. A stiff solver is recommended if Rm   is not infinite.

The electrical circuit for this component is given below:

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In the transformer symbol, the primary side winding is marked with a little circle. The secondary winding is marked with a dot at the outside terminal, the tertiary winding with a dot at the inside terminal.

Parameters and Dialog Box

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Leakage inductance
A three-element vector containing the leakage inductance of the primary side L1  , the secondary side L2   and the tertiary side L3  . The inductivity is given in henries (H).
Winding resistance
A three-element vector containing the resistance of the primary winding R1  , the secondary winding R2    and the tertiary winding R3  , in ohms (_O_  ).
No. of turns
A three-element vector containing the number of turns of the primary winding n1  , the secondary winding n2   and the tertiary winding n3  .
Magnetization inductance
The magnetization inductance Lm  , in henries (H). The value is referred to the primary side.
Core loss resistance
An equivalent resistance Rm   representing the iron losses in the transformer core. The value in ohms (_O_  ) is referred to the primary side.
Initial current
A three-element vector containing the initial currents on the primary side i1  , the secondary side i2   and the tertiary side i3  , in amperes (A). The currents are considered positive if flowing into the transformer at the marked terminals. The default is [0 0 0].