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.

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

@mgovers, @figueroa1395 , Hi!We ran a series of further tests and found a pattern. If after transformer (after to_node) we have only one node, we get sparse matrix error. However,...

@mgovers , @petersalemink95, I don't think the problem lies in the asymmetrical short circuit calculation. Here's an example of the same error in the Power Flow and asymmetrical load calculation....

For analysis, we added an additional link after the transformer and before the load to the previous scheme. The scheme began processing and at the 30th iteration, showed a numericla...

@petersalemink95 , Great, I hope you're right :)

@TonyXiang8787, @mgovers . We used the last pgm version 1.12.69. The sparse matrix error didn't disappear. Files [calculate_model_1.json](https://github.com/user-attachments/files/23647264/calculate_model_1.json) Additional test [calculate_model.json](https://github.com/user-attachments/files/23647573/calculate_model.json)

@mgovers For analysis, we tried increasing the error_tolerance value, and at a value of 1e-1, an error appeared that we didn't understand

@mgovers Thanks for the information. We use parts of a real network for testing, so this was the smallest part that we were able to generate quickly :)

We can certainly change this. But this is an artificial parameter change. We're using real network parameters: Un = 10,000 V, Isc = 5,000 A. If we use 10e12, the...