Three-windings transformer manipulation improvements

[annetill]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Does this PR already have an issue describing the problem?

No. But convenient methods for three windings transformer management is missing.

What kind of change does this PR introduce?

• Get the transformer from a leg.
• Use ThreeSide in ThreeWindingsTransformerToBeEstimated extension.

What is the current behavior?

What is the new behavior (if this is a feature change)?

Does this PR introduce a breaking change or deprecate an API?

• Yes
• No

If yes, please check if the following requirements are fulfilled

• The Breaking Change or Deprecated label has been added
• The migration steps are described in the following section

What changes might users need to make in their application due to this PR? (migration steps)

In ThreeWindingsTransformer.Leg interface, each implementations must add a getTransformer() method that gives the transformer associated to a leg.
In ThreeWindingsTransformerToBeEstimatedAdder, two new methods must be implemented:

• withRatioTapChangerStatus(ThreeSides side, boolean toBeEstimated) and
• withPhaseTapChangerStatus(ThreeSides side, boolean toBeEstimated).

Other information:

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
88.9% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[rolnico]

LGTM