[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [RE]Quenching Theory Question (fwd)
Original poster: List moderator <mod1@xxxxxxxxxx>
---------- Forwarded message ----------
Date: Fri, 18 May 2007 23:57:29 -0400 (EDT)
From: M G <gt4awd@xxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: [RE]Quenching Theory Question (fwd)
p {margin-top:0px;margin-bottom:0px;}
Hi Bart, thank you for the very informative post. I also save the posts I
consider to be of great importance. This will definitely be one of them.
By the way, about your greater gap separation theory. Would it be more
effective to add a "controllable" gap that can be opened more after
initial operation of the gap? This seems like a good idea to me. Maybe it
could be voltage/amperage controlled such as old ammeters are?
Again thanks,
Matt G.
---------[ Received Mail Content ]----------
Subject : Re: [RE]Quenching Theory Question (fwd)
Date : Fri, 18 May 2007 20:22:07 -0600 (MDT)
From : "Tesla list" <tesla@xxxxxxxxxx>
T! o : tesla@xxxxxxxxxx
Original poster: List moderator
---------- Forwarded message ----------
Date: Fri, 18 May 2007 19:16:50 -0700
From: Barton B. Anderson
To: Tesla list
Subject: Re: [RE]Quenching Theory Question (fwd)
Hi Matt,
Yes, voltage is "not" the only the determining factor. Bert
and Jim gave
"beautiful" reply's to this inquiry as they always do. Save
those posts
for reference in the future (I save every post I determine is
gold).
Everything the gap is made of, the geometry, the gas around
the gap, the
supply current and voltage at the gap all determine arc
events. Material
the electrodes are made from influence the arc. Material is
blasted into
the ionizing air and influences the arc channel. The current
effects the
gap resistance and the heat! ed area of the arc channel.
The voltage is a good deter mination for a cold start as long
as the
material and electrode geometry is considered. But once the
arc is
formed, the gap air ionizes, it heats, it has a neutral to
ionized
recovery time depending on all those factors and external
influence
(such as fans). The barometric pressure that particular day
even
influences the breakdown voltage. Many things affect the gap
initially
firing as well as the time required before conduction across
the gap
stops. And then the electrode temperature, air temperature,
gas
ionization, and temperature effect the next breakout
situation. Bert
wisely mentioned the load. That in itself is a large factor
for gap
quenching.
Almost any info you find on spark gaps is always an empirical
number
meaning an experiment or/scientist has measured one
particular number
against another (voltage, electrode size, gap spacing are
regular
measu! rements for dielectric breakdown).
When considering spark gaps and list questions about them, I
often refer
to heat dissipation more than anything else because it is
something we
can control. For say a static gap, I refer to large surface
area to
dissipate heat. Granted, if there was enough moving air for
say a 2
electrode gap, fine, but there must be enough moving air to
cool and
stabilize the heat of a 2 gap setup. So, to deal with the air
flow
capability (the norm), adding surface area (electrodes) is
needed and is
why multigap spark gaps have been used for so long. All
electrodes of
course will have hot spots as determined by their geometry
and position
to each other. But the temperature of those hot spots can be
greatly
reduced simply by the number of gaps which increase the
surface area and
in turn, thermal dissipation. The biggest problem with
several electrode
!
cylinders is the air across them. If uneven, the gap will
start ou t good
but diminish quickly because a few of those electrodes are
not being
cooled like some of the others. Their re-arc voltage lowers,
and it as
if you decreased the gap spacing. If you can keep all the
cylinders
cooling concentrically, then you are on your way to a good
gap. This is
why the TCBOR/RQ gap is so endeared as probably the best
static gap
developed. It does give the ability to cool all cylinder
electrodes
evenly. But even with that, how you manage the air flow
across those
electrodes can also make a bad or good gap.
I probably shouldn't say this, but often I'll set my gap
spacing a
little larger to make up for the re-ignittion voltage rather
than the
initial breakdown voltage. Not a lot, just a wee bit more. I
know that
the reoccurring breakdowns will be at a slightly lower
voltage, so I
compensate a little. Ok, just to you let you know how much?
When ! the
tranny just does not fire with the gap (I set the gap and
tranny alone
by themselves, and increase the spacing until it just doesn't
fire).
Oops, there's one of my personal secrets. Some may see that
as going too
far. I think of it as an intervention due to physics.
Take care,
Bart
Tesla list wrote:
>Original poster: List moderator
>
>---------- Forwarded message ----------
>Date: Fri, 18 May 2007 18:42:39 -0400 (EDT)
>From: M G
>To: Tesla list
>Subject: [RE]Quenching Theory Question (fwd)
>
>p {margin-top:0px;margin-bottom:0px;}
>I'm not an expert at any of this but I can say I looked at
one of this
>list members websites. It showed one volt at one thousand
amps jumping a
>large air gap just as one thousand volts at one ! amp would.
So, I do not
>think the potential difference (vol tage) is the only
determining factor
>to spark length.
>Matt G.
>
>By the way, if the person with this website can link to that
>image/article that would be great.
>
>
>
>
________________________________________________________________________________
Love Games? Gamesville is Waiting for You...
Free Online Games, Fat Cash $ Prizes
Plus Bingo, Solitaire, Poker& Much More! http://www.gamesville.com