Bugs in transformers: wrong sign of secondary power calculation & orientation of secondary components

[modelica-trac-importer]

Reported by christiankral on 3 May 2014 20:25 UTC
Transformer models have a primary side (index 1) and secondary side (index 2). Often power is transferred from side 1 to 2. Nevertheless, any transformer model shall be symmetrical. Therefore, transformer models shall behave the very same way independent on whether power is transferred from side 1 to side 2 or from side 2 to side 1. This is currently not the case.

There are two issues:

• Power consumed by side 1 is considered through of positive sign in power1, but power consumed by side 2, power2, gives rise to a negative sign.
• Orientation of secondary resistor and stray inductor differs from orientation of primary winding resistor and stray inductor.

The problem occurs in Modelica.Electrical.Machines.Interfaces.PartialBasicTransformer. Additionally, connections of models based on this partial model need to be updated.

The issues shall be fixed in the MSL 3.2.1 maintenance branch and in the trunk.

Note: A similar issue occurred in #1226

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Migrated-From: https://trac.modelica.org/Modelica/ticket/1474

[modelica-trac-importer]

Comment by beutlich on 4 May 2014 19:58 UTC
Please check the milestone. If the erroneous version is trunk(dev) then the fix should probably go to MSL 3.2.2. On the other side, if the fix is for MSL 3.2.1+build3 then the error should already be in MSL 3.2.1+build2.

[modelica-trac-importer]

Comment by christiankral on 20 Jun 2014 09:21 UTC
Fixed bugs in trunk and maintenance 3.2.1, see 0414edc, d5a38e5.

[modelica-trac-importer]

Modified by dietmarw on 20 Jun 2014 10:45 UTC