>
>Rich says:
>
> >secondary insulation failure
>
> Interesting. Why should that happen when an arc occurs on the DC
>side? Is it possible that under these extreme conditions, the leakage
>inductance is shocked into a resonant condition providing very high
>voltages?
? ..... seems reasonable, Peter . Henry uses a filter capacitor with
rather low ESR, and no glitch resistor in the hv pos. to limit peak fault
current.
>
>> Proving once again that paper is really and truly hygroscopic
>
>Too right, Rich! Possibly yacht varnish might do,
? Yacht varnish is good, however, it shrinks when it dries, leaving
airways into the transformer windings. Air brings moisture.
>but proper potting is likely to be far better.
? agreed
>Vacuum impregnation even more so,
? ditto
- cheers, Peter. Florida is a virtual Turkish steam bath.
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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