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Re: [TCML] RSG Cooling - was - a new coil being born + PICTURES



Thanks. Worst case is fine for what I may end up doing.

Adam

--- On Wed, 7/30/08, Bert Hickman <bert.hickman@xxxxxxxxxx> wrote:

> From: Bert Hickman <bert.hickman@xxxxxxxxxx>
> Subject: Re: [TCML] RSG Cooling - was - a new coil being born + PICTURES
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Date: Wednesday, July 30, 2008, 11:00 PM
> Hi Adam,
> 
> This is related to the recent "Gaps" thread (BTW,
> there was a 
> transcription error in the table I showed for 2nd notch
> quenching). You 
> can get a ballpark estimate if you know how well your coils
> is 
> quenching. First notch quenching (a single Primary -->
> Secondary energy 
> transfer followed by quenching) is an ideal quench). Spark
> gap coils 
> usually don't quench on the first primary current
> notch. Most well 
> designed SG coils begin quenching on the 2nd or 3rd notch
> (or worse). 
> Also, in well designed coils, about 15% of the system
> energy is lost in 
> the gap during a complete P -->S energy transfer or S
> --> P transfer (if 
> the gap fails to quench). The "worst case" gap
> loss, as a percentage of 
> bang size, can thus be estimated depending on which notch
> you're 
> quenching at:
> 
> Primary   Percent of bang
> Current   energy being lost
>   Notch:   within the gap (X)
> =======   ================
>    1		15%	   	
>    2		39%
>    3		56%
>    4		68%
>    5		77%
> 
> You can take the above quenching factor (X) and multiply it
> by bang size 
> and BPS to arrive at the "worst case" power
> dissipated by the spark gap:
> 
> Wgap = X * Bang Size * BPS  (watts)
> 
> As mentioned, the above will be worst case. Actual gap
> dissipation will 
> be a somewhat less when your coil is breaking out. As heavy
> streamer 
> loading removes significant system energy, quenching
> becomes easier, and 
> solid ground strikes result in an immediate quench.
> It's not unusual to 
> see a system that initially quenches at the 3rd or 4th
> notch improve to 
> 2nd notch and even intermittent 1st notch quenching when
> the coil is 
> really cooking at full power. The converse is also true -
> poor tuning or 
> no breakout will cook your gap electrodes.
> 
> Bert
> -- 
> ***************************************************
> We specialize in UNIQUE items! Coins shrunk by huge
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> ***************************************************
> 
> Yurtle Turtle wrote:
> > This thread got me thinking... Is there any consensus
> over
> > "approximately" how much power is lost (heat
> I need to remove)
> > through a rsg? I have a 10" pig/coil I usually
> run at around 10 kVA
> > with a "four gap" rotary. If I were to try
> and design a cooling
> > system, what would a good rating be for watts to
> dissipate? I
> > probably run around 400 - 480 bps with a 100 nF cap. I
> wanted to
> > check the Joules per bang, but hot-streamer is down
> and that's where
> > I have my specs.
> > 
> > Adam
> > 
> > --- On Tue, 7/29/08, Jeremy Scott
> <supertux1@xxxxxxxxx> wrote:
> > 
> >> From: Jeremy Scott <supertux1@xxxxxxxxx>
> Subject: Re: [TCML] a new
> >> coil being born + PICTURES To: "Tesla Coil
> Mailing List"
> >> <tesla@xxxxxxxxxx> Date: Tuesday, July 29,
> 2008, 11:05 AM
> > 
> > 
> > 
> >>> It'll be interesting to see how hot it
> gets.
> >> Yeah I thought that might be an issue too but
> I'm not too
> >> concerned. The purpose of the ballast is to ramp
> up to full power 
> >> slowly so most of the time the core won't even
> be in. I built
> >> everything for 50A but realistically I'll
> probably only run it at
> >> 30A. (#10 wire in the ballast.)
> >> 
> >>>> Here's some of the  50A 220V cables
> I'm
> >> going
> >>> to use. TIP: Recreational
> >>>> vehicle (RV)  stores are a great supply
> for 50A
> >>> extention cables.
> >>> 
> >>> 
> >>> That's a great tip, thanks!
> >>> 
> >>>> Maxwell Caps. I've had these for
> awhile. 100KV
> >> @
> >>> 10nF.
> >>> 
> >>>> I can easily short out the last capacitor
> for 70KV
> >> @
> >>> 15nF:
> >>> 
> >>>
> http://mywebspace.wisc.edu/jeremyscott/web/MaxCaps.JPG
> >>> 
> >>> 
> >>> I hope those outside terminals don't come
> too
> >> close to
> >>> all that pretty wood!
> >> They actually go through the wood on the ends of
> the box and there
> >> are two screws that I crank down to sandwich the
> bank together.
> >> When I want to take a capacitor out, I loosen the
> press and stick
> >> some wire in there to short out one of the
> capacitors then tighten
> >> it again. Is that bad? I've used this
> capacitor bank before without
> >> problems, and I coat the exposed terminals with
> polyurethane for an
> >> extra little bit of insulation. (Home Depot has
> this liquid rubber
> >> stuff I want to try, but it's ugly orange.)
> >> 
> >> 
> >> 
> >> 
> >> 
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> > 
> > 
> > 
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