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Re: making hv caps
From: richard hull[SMTP:rhull-at-richmond.infi-dot-net]
Sent: Saturday, January 10, 1998 6:00 AM
To: Tesla List
Subject: Re: making hv caps
At 09:41 AM 1/10/98 -0600, you wrote:
>
>From: Bert Hickman[SMTP:bert.hickman-at-aquila-dot-com]
>Reply To: bert.hickman-at-aquila-dot-com
>Sent: Saturday, January 10, 1998 9:35 AM
>To: Tesla List
>Subject: Re: making hv caps
>
>Tesla List wrote:
>>
>> From: Homer Lea[SMTP:HomerLea-at-aol-dot-com]
>> Sent: Friday, January 09, 1998 11:36 PM
>> To: tesla-at-pupman-dot-com
>> Subject: making hv caps
>>
>> has anyone tried to take apart large hv caps like mine (60 kv etc.) ,
separate
>> the smaller segments and partly unwind them to make say 20 or 30 kv caps with
>> less capacitance so they could be used for tesla coils???????
>>
>> jim heagy
>
>Jim,
>
>Richard Hull has a videotape where he did this with a utility
>power-factor correction capacitor. I looked at doing this with a surplus
>54 uF 15 KV polypropylene-kraft paper pulse cap, but it turned out that
>the cap was actually internally constructed as 28 identical ~2 uF
>modules connected in parallel, with none in series! Each element was
>constructed to run at 15 KVDC - not a typical pulse cap at all!
>Reconnecting these modules in series would have resulted in a 0.07 uF
>"bulletproof" cap. It depends to a large extent upon how the capacitors
>are internally constructed.
snip
>Safe cappin' to you!
>
>-- Bert --
>
Bert's info is solid as a rock! You really don't know what is inside an
old HV cap until you bust into it. Only those units with series connected
cap packs are of much value. I have made a number of nice caps up from
large value, moderate voltage caps. For instance I found a 2 ufd 6,000
volt cap one time which had 10 .2ufd seconds all in parallel. I just series
the whole mess and wound up with a cap of .02ufd at 60,000 volts!! I still
use it.
Richard Hull, TCBOR