Re: Inductive Kick LTR Pig Systems

[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


>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