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Re: streamer impedance
Subject: Re: streamer impedance
Date: Mon, 19 May 1997 12:36:48 +1200
From: "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz>
Organization: Wellington Polytechnic, NZ
To: tesla-at-pupman-dot-com
Hi theory group :)
thought I might have a quick shot at this....
> From: pierson-at-ggone.ENET.dec-dot-com
> To:
>
>
> >> Do you think that the streamer impedance can change as fast as
> >> the current in the sinusoidal waveform?
>
> I should certainly hope so. The current determines the
> impedance,
> to some extent...
>
> (Interesting challenge to computer model THAT. 8)>>
> [I ASSume it could be done, but its not gonna be trivial..])
>
> regards
> dwp
Starting point: we know primary ringdown is linear and a linear
decrement has also been observed with secondary discharges. To date
my thinking has been that Vgap conducting is nearly constant. I will
measure this in due course (I could be totally wrong, BUT, the
ringdown is linear). According to the picture I have, Rgap = k/f(ip)
So Rgap = Vgap/ip(t) and we know ip(t) is sinusoidal.
i.e. ip(t) = Ip.sin(wt) where Ip is peak current
=> Rgap = Vgap/(Ip.sin(wt))
=> Rgap = Vgap.cosec(wt)/Ip
and Ip itself changes as ringdown progresses due to loss/transfer to
secondary. This is definitely a first-order shot at it.
I would dearly love to know or develop a formula for the pri-sec
transfer as a function of time. Bert's figures suggest there is
indeed an inertia type of process at work there. Much more to be done.
Musings, comments welcome,
Malcolm