Re: Safety Gaps

• To: tesla-at-pupman-dot-com
• Subject: Re: Safety Gaps
• From: Terry Fritz <twftesla-at-uswest-dot-net>
• Date: Thu, 20 May 1999 21:20:34 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hi All,

At 05:29 PM 5/18/99 +0100, you wrote:
>
>Hi Vivian, and all,
>
>I don't know what size your main capacitor is,  but with such a powerful
>HV supply,  and a low break rate,  you risk overcharging it in the time
>between presentations.
>
snip................
>
>2. Change to a higher break rate such as 200 BPS (still synchronous.)
>Since another presentation has now been added between every 100BPS
>presentation,  these will catch the voltage rise before the safety gap
>fires,  and make use of the stored energy by sending 200 bangs into the
>primary as opposed to 100.
>
snip.............
>
>I opted for a 200 BPS rotary design,  which I have tested at the lashup
>stage,  and it seems to work quite well.  My power supply is 10kv/224mA
>and I got serious overcharging problems with a 100BPS rotary.  The firing
>angle of the rotary was really critical,  if the safety gap was not to
>fire.
>snip..........

I just wanted to mention, as I was studying some MMC power and current
ratings, I found that doubling the break rate will also directly double the
heating and power being dissipated in the primary cap.  So, if your caps
get hot at 100 BPS they will get very hot at 200 BPS.  There is a chance
that doubling the break rate my kill the caps depending on how much heat
they can dissipate and how much head room you have now.

Just a thought...

	Terry 

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