Re: Inductive Kick LTR Pig Systems

["Malcolm Watts" <M.J.Watts-at-massey.ac.nz> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

On 26 Aug 00, at 16:51, Tesla list wrote:

> Original poster: Terry Fritz <twftesla-at-uswest-dot-net>
> 
> Hi All,
> 
> 	A 500uF PFC cap fixed it real good.  240 VAC in at 46.4 amps can charge a
> 350nF cap to 22kV.  I could get that better with fine tuning but the
> numbers are working out just as expected.  The ballast is at 10mH.  So
> about 91% VA efficency without really trying.
> 
> 	With such a large primary cap, the Q for the primary system is really
> important!  A large primary inductance helps a lot but you would really
> need to have a very low loss primary system.  High primary to secondary
> coupling helps but there is a limit to that.  I notice in the models that
> the primary Q and output impedance match to the arc is not well tuned for
> the model I modified for this.  A low system Fo frequency is suggested.
> Perhaps increasing the primary voltage would get over some of the loss
> issues.  Maybe a pig with a voltage larger than 14,400 is really suggested
> at such high power levels...
> 
> Cheers,
> 
> 	Terry

OK - I shouldn't have ignored the primary magnetizing 
inductance.

Regards,
Malcolm
 
> 
> >Hi All,
> >
> >	I was plugging away at a few Inductive Kick Larger Than Resonant designs 
> >with pig transformers with MicroSim.  I can fairly easily charge a 270nF
cap 
> >to 20.3kV at 120BPS while staying inside the "specs" of everything.  
> >However, that is only:
> >
> >1/2 x 270x10^-9 x 20300^2 x 120 = 6676 watts 
> >
> >for 10kVA input.  The problem is the power factor is really bad!  Do people 
> >use PFC caps with pig systems??  I assume the "limit" of such a system is 
> >the AC line current available.  PFC caps may do wonders for getting more 
> >bang for the same current.  PFC cap could easily pull that power factor 
> >right in.
> >
> >IK LTR Pig Systems (IKLTRPS) seem very interesting since we can change the 
> >ballasting and get over a rather obnoxious tuning parameter that cannot be 
> >adjusted on NST systems...
> >
> >If a pig can take a substantial current overload, one could just design an 
> >IKLTRPS to match the breaker box limits ones has available.  50, 100, 200 
> >amps service in other words.  With 200 amp service, you should be able to 
> >get 45kW which is close to what Tesla had and works to 31 foot arcs from 
> >John's equations "stretched" ;-))  Such a system may cost a bit more than 
> >typical but there is a lot of potential for a really efficient home system 
> >that would run an a tremendous amount of power.  Perhaps a 20 or 30 kVA pig 
> >would be best.  I assume pigs are 240:14400 devices.  I work with three 
> >phase all the time so I forget the "home" voltages...
> >
> >Such a system may be kind of grand to do in the garage ;-))  But perhaps a 
> >good Avalon project ;-)  Smaller systems my give wonderful performance with 
> >more modest means...
> >
> >Cheers,
> >
> >	Terry
> 
>