Adding features for threewinding transformer model

[thijsvanderhoeven301]

For TenneT to be able to work with the thermal model a few features have been requested:

• variable cooling stage support for ONAF transformers
• Support for a tap change position dependent load loss
• Allow a top oil temperature measurement as input for the model (this is already possible for the twowinding model

Progress on these features is logged here.

[anna-van-velsen]

✨We have an update concerning the three winding feature!

This morning we released a new version, version 0.2.0, which includes the basic implementation to model a three winding transformer.
The release notes can be found here: https://github.com/alliander-opensource/transformer-thermal-model/releases/tag/v0.2.0

📖 Background

The three winding transformer model is based on how the PowerTransformer and the DistributionTransformer are modelled. Please note that the three winding transformer it is not included in the IEC 60076-7. But our implementation is derived from the methodology used for the two winding transformers as described in the IEC 60076-7.

📈 Validation

It is important to know that we did not validate the output with measurement data yet. So take this into account when using the three winding transformer feature. This is something we will work on together with TenneT in the coming months. So you could ask: why did we already released this model before validation? This is simple: Because we want you to get started with it, gives us feedback and help us validate it!

🚀 Getting started

Please have a look at the example notebook to get started with this new feature.

👀 Outlook

In the following months we plan to get started with the extra features for the three winding transformer

• Variable cooling stage support for ONAF transformers
• Support for a tap change position dependent load loss
• Allow a top oil temperature measurement as input for the model
• Validation with measurement data

[RoosSchellevis]

Great stuff!! Let's do some first validation for the ONAF transformers on the 14th!
I have already added your model to our dashboard for quick visual validation 😄