Re: Rotary Sparkgap
Subject: Re: Rotary Sparkgap
From: "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz>
Date: Wed, 28 Feb 1996 09:58:34 +1200
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Further to my neon addendum and in reply to Jim Fosse...
> I haven't digested all of your post from yesterday yet, so I haven't
> responded to it yet. But today I did call magnacraft (old Jefferson
> Electric) to ask about their Neon transformers. Their product specialist
> said that you could treat the neon as a perfect transformer in series with a
> large inductance for "DC" only. It will not resonate as if it had a 637H
> inductor in series with it, to use your numbers from yesterday. So I guess
> we don't have to wory about the current of a series resonant circuit going
> to 360ma or the voltage going to 36KV.
I've reached the conclusion that the low-level Q I measure is
different from the powered-up Q. But it most certainly ddoes resonate
at low-level, and at least three people here have encountered diffi-
culties associated with resonances under normal running conditions.
I think the 360mA IS invalid. BUT, any resonance implies a higher
current than the limited value into a resistive load. I have opened
up a spark gap to well over the rated peak voltage and I know Ed
Philips has too.
> If I remember correctly, the leakage inductance of a transformer is
> measured by shorting the secondary and then measuring the
> inductance of the primary.
Shorting the primary should achieve the same end as shorting the
secondary IMHO. The idea of using a low-Z generator was to achieve
> If you have an inductance bridge available (I don't) could you measure your
> transformer, primary, secondary, and leakage? It would help some of
> us-old-stumbling-EEs to get back to first principals;)
Looks like I have the same problems myself at times ;) No, I don't
have a bridge that can handle the beast. I reiterate that I think
the resonant f idea (forget the Q one) is valid for finding Xl.
BTW, the primary resistance is less than 2 Ohms. Total core sat-
ration would spell death for primary fuses.