i have data from single prahse ferroresonance and three phase (3* single phase) on medium voltage potential transformers (low voltage model). Data are voltage and curent oscilograms. I did all measurement and evaluation in Matlab but I can export data to other readable format if necessary. I have real model of 3 phase medium voltage measuring node (3 potential transformer), programable serial (resonance) capacitors, programable paralel capacitors, programable load. Open delta of transformers for testing supression methods. I can quite easily make specific experiments for you. Let mi know what is your expectations and what type of data formatu you need.