Hi, Please have a look at this paper: "Abnormal Voltages in Transformers" L.F. Blume, 1919 AIEE (someone had mentioned this prior) I tried attaching the paper, did not work. The most interesting this is that abrupt pulses make transformers react as a condenser rather than an inductor? What is the mechanism behind this? Obviously, coil-to-coil capacitance and mutual inductance plays huge role. Seems to be a non-linear phenomenon, and could have some interesting implications. Anyone have additional references that are similar?