Re: PFC Question

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Dmitry (father dest)" <dest@xxxxxxxxxxx>


you wanna say that if there`s a number of "toroid turns in series with
the load", then these turns  are "seen" by the load as some
inductance? it`s wrong too - variac isn`t an inductive divider, the
voltage on the load doesn`t depend from the current through it, so
load doesn`t "see" any series  inductance.

> Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

> Hi Dmitry,

> YES, the mains see the variac inductance that is in parallel with the
> load. This inductance is very high however.  What I was trying to
> say, was when variac_out = variac_in, the wiper is at the power in
> point on the toroid so there are no toroid turns in series with the
> load for this case.  Hope that is clearer.

> Gerry R

>>Original poster: "Dmitry (father dest)" <dest@xxxxxxxxxxx>
>>
>> > Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
>>
>> > PFC caps can also be placed upstream of the variac as well to 
correct > for
>> > the inductance added by the variac itself.  However, the variac
>> > inductance will be a function of the variac setting (zero inductance
>> > when variac_out = variac_in)
>>
>>it`s wrong - when "variac_out = variac_in" the coil "sees" zero
>>inductance from the mains side, but the mains "sees" the full variac
>>inductance.


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Neon transformers are doomed in Tesla service! I should know, I've
killed more of 'em than many pople have ever even seen in a life time.
25-03-96 (c) Richard Hull, TCBOR