Re: Ok, what is an LTR cap.

[FutureT-at-aol-dot-com (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

In a message dated 8/23/00 7:13:56 PM Pacific Daylight Time, tesla-at-pupman-dot-com 
writes:

> 
>  Actually, PIG's are STR's (smaller than resonant). Typically, coilers use a
>  10kva, 14.4kv pig's. Resonant caps are 0.128uF (from memory). Obvisouly 
HUGE!
> 
>  We typically use smaller than resonant caps (STR's) on our systems. NST's
>  however (and OBIT's), can use LTR's. Could you imagine the joules for a pig
>  using an LTR? I see smoke, fire, wooosh!!! Well, for most of us, not Greg,
>  Bill, Hull, etc... or you Chris (yet?). 
>  
>  Take care, 
>  Bart 

Bart,

I'm not so sure that Pigs use STR's.  I would say that the effect
of the ballast has to be included when defining a cap as STR, Reso
or LTR.  By adjusting the ballast to create a reso condition, the
power factor will be the best (at least at 120 bps) and I run my PT
systems that way.  At higher break-rates, this might change
a little in other words an STR or LTR system might give a better
power factor, but I really didn't do much work in that area.  Has
anyone looked at this or analyzed it?  I know that Richie B has
done some simulations of power factor at various break-rates,
however these may have used a fixed ballast (NST) type xfrmer.

BTW, I've run my PT system in STR, reso, and LTR modes, and
I've posted the results on this list in the past. The only difference 
is that the STR and LTR modes have a very bad power factor.

Progress through innovation, knowledge, and experimentation,
John Freau