PSSE Parser: incorrect impedance when NOMVX is 0.0 about powermodels.jl

[ccoffrin]

Has this been addressed by #919?

[frederikgeth]

Just saw Jay's issue and I think it is the same underlying issue, #888, which ran into this problem for branches, not (3-winding) transformers 2-winding transformers

Note that with r and x both effectively becoming zero none of the bus injection model type formulations will work, and instead converge to an infeasible point.

For those finding this issue before a fix: manually edit your raw file and set the nomv values to the appropriate ones

[frederikgeth]

Ok, also noticing this being the problem in #897

[ccoffrin]

Can you adapt one of the test network datasets to exhibit the issue so that we can make a test for this?

[frederikgeth]

We have a MWE with PSSE baseline results, @hei06j started preparing a PR. Hopefully we can get it out today before flying to PSCC.

[hei06j]

Yes.