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Re: [TCML] Rotary Spark Gap and Safety Gap Behaving Weirdly [VIDEO]
Bingo!
As the OP posted in reply to my YouTube comment, it seems the primary and tank are not connected, just the NST, filter, and SGs. So with no loading whatsoever as soon as the RSG breaks the arc inductive kick raises the voltage above the safety gap setting.
For a proper test I would connect the primary and tank and set up a suitable eddy-current dummy load, I think you'll find the safety gap stops firing and you'll get a real test of the RSG (without reactive components there is no additional current in the arc than what the NST can put out).
-Sigurthr
[This message was sent from my iPhone]
On Apr 13, 2013, at 11:18 AM, jhowson4@xxxxxxxxxxx wrote:
> Oh sorry, you said you set the safety gap.
> In that case i wonder if it just does not like being interrupted. so if you have current flowing though an inductor, and you suddenly stop that current (breaking the gap) the inductor tries to keep that current flowing, by boosting the voltage across the inductor. which would then trigger your safety gap because it has no where else to go? maybe? because you have nothing else connected this might be whats happening.
> Try connected the rest of your coil with a dummy load, and see if the problem persists .
>
>
>
> Thanks,
> John "Jay" Howson IV
>
>
> "Why thank you, I will be happy to take those electrons off your hands."
>
> ----- Original Message -----
> From: jhowson4@xxxxxxxxxxx
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Sent: Saturday, April 13, 2013 10:16:36 AM
> Subject: Re: [TCML] Rotary Spark Gap and Safety Gap Behaving Weirdly [VIDEO]
>
> I am not really sure but It looks like you have the safety gap set to small, Put the transformer across the safety gap and set it until it does not fire at max variac settings. Then connect up your rotary gap and such.
> When the rotary is firing, that's what mine looks like when i'm just running the transformer with nothing else attached, if its not a sync gap then you will get weird pulsing effects, as the electrodes come in and out of phase, I have a dc motor on mine, so i get a wide assortment of weirdness when i run near mains frequency with just the transformer.
>
>
>
> Thanks,
> John "Jay" Howson IV
>
>
> "Why thank you, I will be happy to take those electrons off your hands."
>
> ----- Original Message -----
> From: "Matt \"Sig\" Giordano" <romsigurthr@xxxxxxxxx>
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Sent: Saturday, April 13, 2013 1:24:05 AM
> Subject: Re: [TCML] Rotary Spark Gap and Safety Gap Behaving Weirdly [VIDEO]
>
> Hello Brandon,
> Do you have a dummy load in place at the center of the primary coil? The
> energy has to go somewhere, and if it isn't being delivered to a load then
> perhaps you are getting resonant rise when the RSG fires as the energy just
> sloshes back and forth between L and C?
>
> -Sigurthr
>
> -----Original Message-----
> From: Brandon Hendershot
> Sent: Friday, April 12, 2013 6:41 PM
> To: Tesla Coil Mailing List
> Subject: [TCML] Rotary Spark Gap and Safety Gap Behaving Weirdly [VIDEO]
>
> Hi All,
>
> Decided to give my SRSG a spin with just the transformer hooked up, and
> although it didn't explode catastrophically, it didn't play nicely with the
> others. I took a video and put it up here:
> youtube.com/watch?v=lBi0Rl9jLuU<http://www.youtube.com/watch?v=lBi0Rl9jLuU>
> MAKE
> SURE annotations are ON (Left-most icon in the group of icons at bottom
> right of the video player, looks like a speech bubble (On by default).).
>
> I'll summarize the issue here for archival purposes should the video ever
> disappear. I've made sure to set the safety gap properly without the rsg
> connected. The safety gap will not fire with the variac turned up to max
> voltage, but as soon as the RSG is engaged, the safety gap will fire
> immediately. After turning the variac down and extenguishing the arc, it
> will reignite when re-approaching max (130-140V) voltage. Again, the safety
> gap will NOT fire even at max voltage when the rsg is turned off.
>
> Thoughts, solutions, and further test procedures welcome.
>
> Thanks,
> Brandon H.
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