Re: Rotaries and Neons new question (fwd)

To: tesla-at-pupman-dot-com
Subject: Re: Rotaries and Neons new question (fwd)
From: Tesla List <mod1-at-pupman-dot-com>
Date: Sat, 8 Aug 1998 14:11:23 -0600 (MDT)
Approved: mod1-at-pupman-dot-com



---------- Forwarded message ----------
Date: Sat, 08 Aug 1998 18:57:16 +0930
From: Mark Finnis <mefinnis-at-medicine.adelaide.edu.au>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: Rotaries and Neons new question (fwd)

At 20:57 7/08/98 -0600, Gary Lau wrote:

>Consider this contrived example.  Maximum charging voltage of the xfmr is
>10KV, 60 Hz.  Ignore resonance.  RSG is running 240 presentations per
>second (exactly two per half cycle), and gap breakdown voltage at each
>presentation is 7.1KV.  If the phasing of the rotor is such that the
>presentations occur at 45, 135, 225, and 315 degrees of each cycle (90
>and 270 being the peaks), the gaps will never fire, since Vcap is
>10KV*sin(45)= 7.07KV at each presentation.

I am probably about to make a complete ass of myself in public here, but....

Why does the V across the cap decline after the half-cycle peak ?

I understand at first presentation we will be under V, but we then go
through Vpeak, which is (assuming no losses) what I would expect the Vcap
to be at the next presentation ?

I would expect from the above example to fire every second presentation,
approximately.

But then I'm no EE and my theory is as thin as a politicians veil of
honesty ;-)

Some-one clever like to comment on this for me ..... please !


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