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Re: Safety gap issues

Original poster: "Freddie Hamilton" <crzydmd@xxxxxxxxxxx>

Comments interspersed.

From: "Tesla list" <tesla@xxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: Safety gap issues
Date: Wed, 23 Nov 2005 20:09:53 -0700

Original poster: "JT Bowles" <jasotb@xxxxxxxxxxx>

considering my current capacitor i rated at 18KV, and is destroying itself(i can see internal flashes, often), i need a higher voltage rated capacitor, before i can turn my coil up to 11KV spark gap.
Considering that your spark gap is (Presumably) set to <11kV, and your cap is arcing over, I would say that your current capacitor isn't rated at 18kV, and thusly you need a "higher voltage rated" cap for your present configuration (let alone running a wider statig gap).

I am currently hopefully getting 12 caps, together with a capacitance of 7.33 nF, rated double my previous cap. (36,000 KV now)

as soon as i buy this new cap, i will put it in my system, and turn up to full power. Then well see who has the best coil on the net..... 

: - D  Good One!


From: "Tesla list" <tesla@xxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: Safety gap issues
Date: Tue, 22 Nov 2005 13:27:11 -0700

Original poster: "Malcolm Watts" <m.j.watts@xxxxxxxxxxxx>

On 22 Nov 2005, at 12:19, Tesla list wrote:

> Original poster: "JT Bowles" <jasotb@xxxxxxxxxxx>
>
> Either I have constructed such a safety-perfect circuit,

Such as what?
or my

safety
> gap is being dumb.
That's gotta be it! Education is the key to "smart" safety gaps! 
>
> I added a grounded middle node, and now it NEVER fires.(I think i saw
> it fire twice in a couple minutes of operation). Whats the deal?

I am 
> using my RF ground, the same one attatched to my secondary. I spaced
> the safety gap JUST over what the main spark gap is set at. So, whats
> the deal? could by ground be so used up


???  Your ground is "so used up"?  What do you mean?

that it is actually 
repelling
> a spark in my safety gap?


You're kidding, right?

>
> - I measured , with a ruler, it to be 8000 volts across the Saf. gap.

I wish my rulers could measure kV, but alas, I can only afford the cheap kind that read in inches or centimeters. ;-)

> -my main spark gap is set up at around 7300 volts (also measured with
> a ruler device) -my xformer is a 12,000 volt output *should I even
> worry about this*

Assuming that by saying "my main spark gap is set up at around 7300 volts (also measured
with a ruler device)" you actually mean: I estimate my sparkgap breakdown voltage to be around 7300 Volts based upon the measured gap of a little more than 3/32" and the commonly quoted breakdown voltage of air (in a uniform field) being 30kV/cm (Which is wrong anyway), then no, I wouldn't worry about the gap distance being risky for your nst.

Given the above assumptions, your safety gap is set to a little less than 7/64". There is not much difference in length between 3/32" and 7/64" (It's only 1/64") or alternately, there is not much difference in the length that 8kV and 7.3kV will spark.

But, assuming that the above assumptions are likely totally incorrect, it would be of much more use to state your gap distances in inches/cm if you would like for it to receive analysis from the list. Try to be as accurate as possible, and also describe the details of your gap (Such as parts used, geometry of the layout, flavor of the electrodes while firing, etc.) OK, maybe not that last one...