Re: 200:1 Potential Transformer

["Tesla list" <tesla-at-xxxxxxxxxx>]

Original poster: "Barton B. Anderson" <tesla123-at-pacbell-dot-net> 

Hi Jason,

Smart question (hope I can give a smart answer):

Higher voltage at the cap can be very desirable, but over-voltage is a typical
failure for caps in disruptive high voltage tesla service. How far you push the
tranny depends on two things. (1) The cap rating and (2) your over-volt safety
factor. Periodially, the cap may see Vp-p voltages as well as high
transients. At
24KVrms your looking at a cap rating of 24kv x 1.414 x 2 = ~68kv minimum! A
typical safety factor is 3 times the cap rating. For example, if a cap is
rated at
60kv(AC), then don't pump in less than 20KV at the tranny. Some like to
extend the
factor higher than 3 depending on their experience and/or fear of loosing a
high
dollar cap. Safety gaps of course help to prevent popping a cap. Don't rely
on the
safety gap to limit the cap voltage. Rely on your design.

Take care,
Bart

Tesla list wrote:

> Original poster: "tesla" <tesla-at-vortexia-dot-com>
>
>     Greetings all. I need some advice.... I just aquired a GE Super Bute
200:1
> insturment transformer. I am not entirely sure how to integrate this type of
> transformer into my current system. I am looking at being able to limit the
> current on the 120 side to 14-20A, but should I run this at full voltage (it
> produced 24KV from 120)? Would it be better to run it at 80-90V input at
> 14-20A? I am just not sure and I do not wnat to kill a perfectly good
> transformer by overloading it (does anybody have an idea of the current
> handling capacity on these things?).
>     I would more than welcom any kind of advice that I can get on this one.
>
>         Thanks in advance,
>                         Jason Zuberer