• Do you want to request a feature or report a bug?

Feature

• What is the current behavior?

Currently, it is possible to accidentally connect, say a 400kV bus to a 220kV one which can lead to weird load flow results (in my case, I also obtain different results when using itools and pypowsybl, maybe because of different versions/default parameters).

• What is the expected behavior?

Output a warning when computing a load flow for such invalid cases (I guess no warning should be given for connections between 380 and 400KV buses).

• Please tell us about your environment:
  • PowSyBl Version: ...
  • OS Version: Ubuntu 22.04