RE: Recent power arc experiments

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "boris petkovic by way of Terry Fritz <twftesla-at-uswest-dot-net>" <petkovic7-at-yahoo-dot-com>






> Just a thought...I haven't tried this but you could 
> Try running the resistors with no arc gap to
> eliminate the power division
> (check for temp rise) 
> (may need >>R to better simulate entire channel Z),
---
With no arc gap (resistors connected to the sphere)
13.5 kohm string doesn't get warm either.
But this is to be expected becouse the set up like
this
causes significant out of resonance condition.
Higher  rated resistors we have at moment are 
four 20kohm ,15 W.They are much bigger than 5 W
resistors.
The string of such was tested without arc too,and
there was no heat again.And again,that was probably
due to detuning (noticable increase of light and sound
from rotary).
What was intersting that longer arc gaps tests with 80
kohm string (>10") ended with a complete failure.
Arc was  restless ,more deattaching than attaching
,and seemed like it avoided to connect   
desirable path.    
We will get new supply of varios  resistors and
hopefully proceed with experiments.
BTW,I don't doubt that 200 kohm string,if power rated
adequatly ,wouldn't get warm.It would.
Lenght of string in higher kohm range must be wisely
choosen.Otherwise ,arcover might likely to occur.
------ 
    

 
> i.e. resistors connected to the topload, 
> then with 1", 2",... controlled gap length arcs,
> etc.
> 
> then Try ~200K ohms with no arc 
> then with arc to presumably divide power in ~half ?
> (when arc R=~200k?)
> 
> Measure I w/ oscilloscope current probe around
> the return side of the resistor to low side of Sec
> as a check on current waveform shape to calc avg
> power.
> 
----
Like to do one day.Not possible at the moment.



Regards,
Boris

> -----Original Message-----
> From: Tesla list [mailto:tesla-at-pupman-dot-com]
> Sent: Tuesday, February 20, 2001 3:50 PM
> To: tesla-at-pupman-dot-com
> Subject: Recent power arc experiments
> 
> Original poster: "boris petkovic by way of Terry
> Fritz
> <twftesla-at-uswest-dot-net>" <petkovic7-at-yahoo-dot-com>
> 
> Hi All,
> 
> The result of following experiment,fellow coiler
> conducted  recently,seems bit strange (at least for
> me
> ,since I suggested him to do it estimation vise).
> 
> According to the instructions, he hung ,verticaly,
> above 10" spherical terminal of his coil several
> resistors and grounded them via wire in a celling.
> Between  sharp point on the top of the sphere and
> string of resistors there was formed variable gap
> that
> way.
> For the particular coil and power level used,it was
> found to be most convenient to use 19" gap spacing.
> At this stage ,attached arc would be quite stable
> and
> could last for quite a time without deattachment.
> The string of resistors was made of identical parts-
> each resistor rated 5 W-1500 ohms.
>    
> Now,the strange part.
> Experimentally,by low frequency test,it was found
> that
> ,if forced to dissipate 10 W ,these resistors
> considerably  get warm.
> Since ,there were 9 of them put in series,90 W would
> do a nice heating effect to them (very soon).
> But,nothing of the expected heating was noticed.
> The experimenter,after few minutes of TC run turned
> the power off,and touched the resistors.
> They stayed reasonably cool.
> 
> Used input power level for that and other
> experiments
> was always the same -about 650 W.  
> This is a nice classical TC system;with 300 BPS
> rotary,20"*6" closewound secondary and by using 650
> W
> it can occasionally  develop 36" point to point
> arcs. 
> 19" spacing provided for the arc the most stable
> condition with  the dimmest primary gap light
> running,
> though.
> The result of all said :Total string resistance
> 9*1500=
> 13500 ohm consumed less power than secondary power
> arc.
> This is very much in confrontation with usual view
> of
> the impedance ballpark of such arc.
> Anybody else performed similar expertiments,and
> wondered why there wasn't any smoke where it had to
> be?
> Any comments ,and thoughts on this would be welcome.
> 




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