Reactive,
Great info on a unique problem being debugged.
We have debugged several like this. One involved energizing a backup UPS with filters onto a backup gen. The transformer magnetizing inrush and UPS filter first parallel resonant point on the 3rd created an excessive transient...
Reactive,
Did you finally solve your problem?
The last post on EMTP modelling is an excellent recommendation, and I also would recommend this. In my earlier years when working under a noted harmonics expert, he always recommended never allowing a first parallel resonant point sitting on the...