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Re: Measuring inductive limits (was Re: Rotary Sparkgap)
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To: tesla-at-grendel.objinc-dot-com
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Subject: Re: Measuring inductive limits (was Re: Rotary Sparkgap)
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From: "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz>
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Date: Tue, 27 Feb 1996 09:25:44 +1200
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In reply to Wes,
> The few fields texts that do the analysis for a shunt limited
> transformer also show the shunt producing an effective series
> inductance, so this is as it should be. Could you describe the
> setup you used to separate out the resistive and inductive
> parts? Since the inductance is kind of a virtual thing, inside
> the fields of the transformer iron, as it were, I've never
> come up with a really good way of measuring it.
I've just sent a post on how to estimate transformer power.
Some of the ideas expressed therein can be used. But the real
one is to measure the Q of the circuit. Since you can measure
R directly, and since Q = Xl/R, you can calculate Xl and hence
L.
More directly, L = (Q x R)/(2 x PI x f)
You can also use Q = 1/R x SQRT(L/C) in the form :
L = Q^2 x R^2 x C
Malcolm