RE: PFC Capacitors

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

Original poster: "John H. Couture by way of Terry Fritz <twftesla-at-qwest-dot-net>" <couturejh-at-mgte-dot-com>


Ed -

While I was trying to figure out how to answer your post Dan and Bart did it
for me and did a better job than I could have done. I
have found, however, that there appears to be many different answers from
the List for correcting a certain LPF NST. It should be noted that if the
capacitance is too large you will have a leading PF which is undesireable.

John Couture

---------------------------


-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Friday, August 02, 2002 5:35 PM
To: tesla-at-pupman-dot-com
Subject: Re: PFC Capacitors


Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<evp-at-pacbell-dot-net>

Tesla list wrote:
>
> Original poster: "John H. Couture by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <couturejh-at-mgte-dot-com>
>
> PFC capacitors are used to reduce the wallplug ampreage for low power
factor
> neon sign transformers (NST).

	The input PF isn't low when the tank capacitor is anywhere near
resonant [the "matched" value], particularly after the transformer
fails.  I can certainly see how a capacitor across the line can reduce
the current IF the input reactance is inductive, but why should it be?

Ed