Re: [TCML] high frequency wave propagation along secondary coils

[Steve Ward <steve.ward@xxxxxxxxx>]

Hi Paul,

Of course, a base current measurement would be useful.  I happen to
have a pearson CT on hand, i will try to get that measurement once the
coils are rigged again.  I think i can figure out how to interpret the
results, but dont be surprised if i ask someone to check my math ;-).

Steve

On Fri, Sep 28, 2012 at 2:30 PM, paul <tcml88@xxxxxxxxxxx> wrote:
> Steve Ward wrote:
>
>> How much confidence do you have in those simulations?
>
> Not a great deal, it extrapolates well beyond the model's domain
> of qualification by measurements. It is quite a crude simulation
> of a complete discharge from the topload, programmed to occur at
> the peak of the top voltage to represent a worst-case scenario.
>
>
>> It basically shows about 2/3 of the top voltage applied
>> across the bottom 10% of the winding, which sure looks
>> like a recipe for failure.
>
> The transient should be readily visible in the base current
> waveform.   With a suitable test rig this could be recorded
> and the voltage gradient near the base reliably deduced from
> the current waveform.
>
> The model uses a limited number of frequency components,
> in reality the transient could be even steeper, at the top
> at least.   The intention was to demo one possible cause of
> racing arcs and I often wonder how much HF energy is sent down
> into the coil from smaller step changes in top volts resulting
> from normal (to air) breakout.   HF components show up well
> in base current waveforms and would be a good diagnostic -
> unfortunately recordings are rare as hen's teeth.
>
> --
> Paul Nicholson
> --
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