[bug] Test fail on Mac OS for tap dependent impedance

[j0m0k0]

Bug report checklis

• Searched the issues page for similar reports

• Read the relevant sections of the documentation

• Browse the tutorials and tests for usefull code snippets and examples of use

• Reproduced the issue after updating with pip install --upgrade pandapower (or git pull)

• Tried basic troubleshooting (if a bug/error) like restarting the interpreter and checking the pythonpath

Reproducible Example

Install the latest version of pandapower in Mac OS M2, using pip.
Then run the following code, as mentioned in the documentation here

import pandapower.test
pandapower.test.run_all_tests()

Issue Description and Traceback

There is one test that fails:

============================================================================== short test summary info ===============================================================================
FAILED .venv/lib/python3.12/site-packages/pandapower/test/control/test_tap_dependent_impedance.py::test_characteristic_diagnostic - AssertionError: assert 'The characteristic value of 6.0 at the neutral tap position 0 does not match the value 6.000001' in 'Checking transformer characteristics\ntrafo: found 2...
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! stopping after 1 failures !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
======================================================== 1 failed, 181 passed, 12 skipped, 3 xfailed, 229 warnings in 21.68s =========================================================

Expected Behavior

All tests should pass.

Installed Versions

• python version: 3.12
• pandas version: 2.2.3
• networkx version: 3.4.2
• scipy version: 1.13.1
• numpy version: 1.26.4
• packaging version: 2.14.11
• tqdm version: 4.67.1
• deepdiff version: 8.1.1
• Operating System name/version: MacOS 14.7

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[tellitos]

I get the same message and while running the sample code from the tutorials I also get different angle values for S apparent power angle. Im very thankful for any help or leads.

[vogt31337]

Hello,

thanks for raising the awareness to this issue, currently there is a large PR in the making which will change some of the inner workings regarding this part of pandapower.

@tellitos, could you perhaps point me to which tutorial this problem arose?

BR

[tellitos]

Hello,

thanks for raising the awareness to this issue, currently there is a large PR in the making which will change some of the inner workings regarding this part of pandapower.

@tellitos, could you perhaps point me to which tutorial this problem arose?

BR

@vogt31337 thanks for answering im referring to this Tutorial: Four bus system
pandapower.networks.simple_four_bus_system()[](https://pandapower.readthedocs.io/en/latest/networks/test.html#pandapower.networks.simple_four_bus_system)

It seems to be like the angle just gets -150
Kind Regards

[vogt31337]

@j0m0k0, @tellitos I have talked with @pawellytaev and the discrepancy is, because the shift_degree from the trafo is now set to 150° and not to 0°. If you change this back it'll return the old results.
I will investigate, why the standard parameter was defined like this.

@j0m0k0, why the tests are failing on MacOS, I can't help. I do not have access to a Mac. Maybe you retry it again and post more output of the actual error message.