Re: NST frequency

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

Original poster: "Area31 Research Facility by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rwstephens-at-hurontario-dot-net>

I believe that Darin's problem of the inverter going stupid is being caused by
EMP when he discharges his Multiplier.  It could well be that there is enough
increase in EMP from 4 stages over 3 that he thresholds into this problem.  I
built a tabletop Cockroft Walton multiplier that achieves 150 KV on top from 5
kVAC input in the lab and the first time I discharged it into a grounded wand
it made a VCR in the same room lock up so badly it had to be left unplugged
overnight to recover.
 
Physically disconnecting the inverter and also powering it down prior to
discharging the multiplier may be helpful, although no guarantee of saving the
inverter from catastrophic damage.  Shielding and bypassing of all leads in and
out of the inverter may help.
 
Rob
>
> -- Original Message ----- 
> From: <mailto:tesla-at-pupman-dot-com>Tesla list 
> To: <mailto:tesla-at-pupman-dot-com>tesla-at-pupman-dot-com 
> Sent: Wednesday, August 01, 2001 20:17
> Subject: Re: NST frequency
>
> Original poster: "Kevin Ottalini by way of Terry Fritz
> <<mailto:twftesla-at-qwest-dot-net>twftesla-at-qwest-dot-net>"
> <<mailto:ottalini-at-mindspring-dot-com>ottalini-at-mindspring-dot-com>
>
> Darin:
>         The number of stages should not directly affect the inverter except
> under load. I'm guessing that you actually overvoltaged something.
>
> What exactly did you use for the caps and diodes in the Cockroft?
>
> You should also monitor the input current to the inverter.  If the current
> goes
> up when you add the Cockroft on then you have some sort of short or
> breakdown happening (I expect a little increase).  Make sure the HV output
> from the Cockroft is isolated (no load) during the test.
>
> You shouldn't hear (or see) any corona (crackling) when the unit is
> running.  If you do, than you have an isolation and leakage problem
> that needs to be fixed before anything else can happen.  You may
> actually be trying to generate too much voltage ... 9kv to 15kv DC
> is all that you need for a DCTC.
>
> Without knowing exactly the voltage and frequency of the inverter, it will
> be difficult to calculate what the Cockroft will do, but if you supply the
> diode and capacitor values you used (value and voltage and type) I can
> give you an approximate idea of what is happening.
>
> Kevin
>
>
> ----- Original Message -----
> From: "Tesla list" <<mailto:tesla-at-pupman-dot-com>tesla-at-pupman-dot-com>
> To: <<mailto:tesla-at-pupman-dot-com>tesla-at-pupman-dot-com>
> Sent: Wednesday, August 01, 2001 3:23 PM
> Subject: Re: NST frequency
>
>
> > Original poster: "Darin Willson by way of Terry Fritz
> <<mailto:twftesla-at-qwest-dot-net>twftesla-at-qwest-dot-net>"
> <<mailto:darinwil-at-execpc-dot-com>darinwil-at-execpc-dot-com>
> >
> > Thanks for the info, I have built an Cockroft it is 3 stages. I dont know
> > how much it puts out but If I go for 4 stages
> > the dead short protection for the inverter kicks in when I discharge it
> and
> > I have to disconnect the power for 10secs
> > before it will reset. Any one know where I can find equations for a
> > Cockroft so I can figure out what I am getting so far?
> >
>
>
>