Modelling Transformers from data sheets or factory test certificates

I have data from 2 similar 33/11kv transformers

Tx1:

Positive Sequence resistance/reactance + Zero Sequence resistance/reactance (all per unit)

Tx2:

Primary and secondary winding resistance (ohms), no load losses (watts and amps), impedance/reactance at full load (%)

How do these figures get intergrated into a simscape electrical 3 lim transformer?

Answer 1

[Joel Van Sickel]

Hello Joshua,

You primarily need the per unit resistance and inductance of the two windings. You would need to convert the tx2 data on impedance/reactance at full load to per unit as well. Those would be enough to parameterize a linear transformer that gives you decent results at full load. You could then use the additional knowledge of no load losses to better tune the magnetization resistance to provide something more realistic.

Here is an example specificly for this type of transformer.

https://www.mathworks.com/help/physmod/sps/examples/three-phase-three-limb-core-type-two-winding-transformer.html

Please see it's doc page for specifics and if you are intersted, this the reference used for builiding this model: [1] IEC. International Standard IEC 60076-1, Power Transformer - Part 1: General, Edition 2.1, 2000–04. "Annex D: Three-phase transformer connections." 2000.

Regards,

Joel