Saturable Transformers
Purpose
Single-phase transformers with two resp. three windings and core saturation
Library
Electrical / Passive Components
Description
These transformers model two or three coupled windings on the same core.




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
- Leakage inductance
- A vector containing the leakage inductance of the primary
side
, the secondary side
and, if applicable, the tertiary side
. The inductivity is given in henries (H).
- Winding resistance
- A vector containing the resistance of the primary winding
, the secondary winding
and, if applicable, the tertiary winding
, in ohms (
).
- No. of turns
- A vector containing the number of turns of the primary winding
, the secondary winding
and the tertiary winding
, if applicable.
- Magnetizing current values
- A vector of positive current values in amperes (A) defining the piece-wise linear saturation characteristic of the transformer legs. The current values must be positive and strictly monotonic increasing. At least one value is required.
- Magnetizing flux values
- A vector of positive flux values in Vs defining the piece-wise linear saturation characteristic. The flux values must be positive and strictly monotonic increasing. The number of flux values must match the number of current values.
- Core loss resistance
- An equivalent resistance
representing the iron losses in the transformer core. The value in ohms (
) is referred to the primary side.
- Initial current
- A vector containing the initial currents on the primary side
, the secondary side
and the tertiary side
, if applicable. The currents are given in amperes (A) and considered positive if flowing into the transformer at the marked terminals. The default is [0 0 0].