Simulation of Experiment 24A (...version b)

Some of my 34  measurements serve for Microsim 8 modelling. The schematics file for this simulation can be downloaded as Induktor24Ab.sch
Operating the inductor with 8 mm secondary-spark. The sparking time is adapted to the experiment (3.5ms; sorry: no predictive way!). The breakdown voltage of the sparkgap was estimated by a first simulation run without spark (breakdown voltage set to DC=1000kV), then reading the first peak of U2~15.5kV, then setting DC=15kV. The log-decrement of the oscillations in dominated by the value of the "iron resistor" Rfe, which, within reasonable limits, regarding results from 50Hz "transformer tests", was looked at, as a fitting parameter for the damping behavior of the oscillations. However, in this simulation, Rfe was transferred to the secondary side, as Rsec, by multiplying Rfe with the winding ratio n=N2/N1squared (= 2022 = 40'804; ...Rfe=1M in the schematic is only a placeholder!). The simulation result, giving a qualitatively less satisfying representaton of the experiment than before, is considered better, because of:

1.) Simulated voltage U1 closer to experiment ( i.e. U1max = 70V(sim.) vs. 66V(exp.) )
2.) Superposition of higher frequency "ripple" on ringdown  less prominent.
     (however: the small ripple is real, and can be observed experimentally at the start of  primary current).
3.) Phase-information of simulation only in raw agreement with experiment, even less than before ---> is yet unsatisfying.

Simulated Waveform Waveform Photo 33A