Re: Saturable Reactors as Ballast

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Finn Hammer <f-h@xxxx>

Carl,

Yes, "u" is voltage across inductor being measured.
u = wLi

Rearrange for L you get:

L=u/wi
And can see that for a given current, voltage across 
inductorincreases with L and for the same voltage across inductor: 
current decreases with inductance. Which is what you`d expect.

Cheers, Finn Hammer

Tesla list wrote:

> Original poster: "Carl Litton" <Carl_Litton@xxxxxxxxxx>
>
> Thanks, Finn.  What is 'u' in your equation - the input voltage?
>
> Carl Litton
>
>
> -----Original Message-----
> From: Tesla list [mailto:tesla@xxxxxxxxxx]
> Sent: Saturday, December 24, 2005 10:37 AM
> To: tesla@xxxxxxxxxx
> Subject: Re: Saturable Reactors as Ballast
>
> Original poster: Finn Hammer <f-h@xxxx>
>
>
>
> Tesla list wrote:
>
> >Original poster: "Mike" <induction@xxxxxxxxxxx>
> >
> >Hi Carl,
>
> Snip
>
>
> >Next week or two, if I can cut loose from other stuff at work, I
> >will try and use the LRC meter to get you some L values on the AC
> >windings as well as the control windings.
> >Mike
>
> Mike,
>
> Pls. notice that few LCR meters can supply enough current to produce
> a usefull measurement on iron cored inductors. By exciting the
> windings with a typical LCR meter, the iron will be operating in the
> low "initial permeability" area of the B-H curve, and the readings
> will turn out to be too small.
>
> Instead, you should connect the windings across a variac, with a
> Ammeter in series, and calculate inductance according to:
> u = wLi
>
> W = Omega = 2*pi*frequency = 2 * 3.14 * 60 = 377
>
> Cheers, Finn Hammer