Re: DC? was: mechanical bridge rectifier

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

At 11:57 AM 11/20/2002 -0700, you wrote:
>Original poster: "J Dow by way of Terry Fritz <twftesla-at-qwest-dot-net>" 
><jdowphotography-at-hotmail-dot-com>
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>Good evening folks
>Recently I asked about rectifying AC on the low side of the mane 
>transformer in a TC.
>The answers from the list were a resounding NO it can’t be dun.  So then 
>if DC is bad for transformer action why is it ok for HV TC work? The TC 
>(pri ­ sec) is just a transformer.
>Why is DC bad for one kind of transformer and not for another?


The spark gap, primary cap, and primary inductance make AC (at ca. 100 kHz) 
from DC, so the transformer thing works.

A DC tesla coil, then, goes AC/DC/AC

240 V AC line at low voltage and 50/60 Hz
15 kV AC HV after transformer at 50/60 Hz
20 kV DC after rectifier/filter (0 Hz)
20 kV HV AC produced by sparkgap/Lpri/Cpri (100 kHz)
500 kV EHV AC after transformer (TC primary/secondary) (100 KHz)