[BUG] *Sparse matrix error when calculating the transformer 63/10*

[WinApiMan]

Hi!I encountered a problem. When calculating the asymmetrical short circuit (A) on the 0.4 kV busbar of a transformer with Id=1503, a sparse matrix error occurs.Moreover, when calculating an asymmetrical short circuit on the buses of a similar transformer ID=1426, such an error does not occur. We reconnected the objects. We replaced ID=1426 with ID=1503, and set 1426 instead of 1503. However, the error still occurs precisely where ID=1503 is set. Perhaps this isn't a bug, but my own mistake, and you can help me solve this problem.

Input Data Validity
calculate_model 1503.json

calculate_model ID1426.json

calculate_output_model ID1426.json

Screenshots

[mgovers]

hi @WinApiMan, Thank you for reporting this.

Can you try to load the data into Python and use the data validator (https://power-grid-model.readthedocs.io/en/stable/user_manual/data-validator.html)? This may expose some basic usage problems that may not be caught in the C API.

Can you please also provide the exact PGM version you are running (either release tag or Git SHA) and, ideally, an example script of how you run the PGM? With that, we can try to have a look at this tomorrow.

[mgovers]

FYI, I've been able to reproduce the SparseMatrixError and I also confirmed that our data validator does not signify any errors. We will dive into this now.

[WinApiMan]

Hi @mgovers, Thanks for the quick reply.

We are using version 1.12.54. I'm attaching a test example of the call script and errors.

[mgovers]

Thank you for your extensive input, it really helps with the investigation. This indeed seems something that requires a deep-dive on our end. We will investigate.

[figueroa1395]

Hello @WinApiMan,

I want to let you know that we are actively working on this issue. We have found some leads, but nothing conclusive yet. We will communicate with you as soon as we have more concrete progress.

[WinApiMan]

Hi @figueroa1395!Thank you, the moment is quite relevant, so we are waiting