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Re: rolled caps [Oil source ? ]
From: Mad Coiler[SMTP:tesla_coiler-at-hotmail-dot-com]
Sent: Wednesday, September 10, 1997 11:21 AM
To: tesla-at-pupman-dot-com
Subject: Re: rolled caps
>
>From: Peter Electric[SMTP:elekessy-at-macquarie.matra-dot-com.au]
>Reply To: elekessy-at-macquarie.matra-dot-com.au
>Sent: Sunday, September 07, 1997 4:58 AM
>To: Tesla List
>Subject: Re: rolled caps
>
>Tesla List wrote:
>
>> From: Mad Coiler[SMTP:tesla_coiler-at-hotmail-dot-com]
>> Sent: Saturday, September 06, 1997 3:22 PM
>> To: tesla-at-pupman-dot-com
>> Subject: Re: rolled caps
>>
>> >From: Geoffrey Schecht[SMTP:geoffs-at-onr-dot-com]
>> >Sent: Saturday, September 06, 1997 9:46 AM
>> >To: Tesla List
>> >Subject: Re: rolled caps
>> >
>> >Answers to questions:
>> >
>> >1.) Having a PE-al-PE-al cap will give you about about half of the
>> >capacitance of a PE-al-PE-PE-al cap since capacitance is directly
>> inversely
>> >to plate separation
>>
>> I think you meant double the capacitance.
>>
>> >(I think that I understood the question...maybe you
>> >should repost with a layer scheme like the one I just used).
>> >
>>
>> I dont think you eactly understood. The actual distance between
plates
>>
>> should stay approximately the same - three thicknesses of 30 mill PE.
>> I
>> will attempt to show the two chioces I am facing:
>> -- plate A
>> O PE 1
>> O PE 2
>> O PE 3
>> -- plate B
>>
>> OR
>>
>> -- plate A
>> O PE 1
>> -- AL (spacer)
>> O PE 2
>> -- AL
>> O PE 3
>> -- plate B
>>
>> Since the AL inbetween the PE layers is electricaly shorted from one
>> side to another it shouldn't add to the total seperation of the
>> plates.
>> Another way to see this is that as the thickness or the dielectric
>> increases the capacitance goes down. In both models the thicknes of
>> the
>> dielectric is constent - 90 mills. I just thought that having
>> conductive
>> plates between might improve the efficiency of energy storage. Having
>> the extra plates would allow smaller charges to act on each other at
>> closer distances, perhaps allowing it to be better at pulse type
>> discharging? Hmmm, is that any clearer?
>>
>
>Dear Mad,
>
>There is one problem with the PE,Al,PE,AL,PE type cap. If you get just
>one weak point in your PE anywhere in the cap, the voltage will punch
>through and wreck your cap. On the other hand, if you have several
>layers of PE together, the chances of two weak spots coinciding is
>extremely remote.
>
>I think this outweighs any other advantages you might get with the
idea.
>
>Cheers,
>
>Peter E.
>
>
>
Thank you all for helping me with this. I would have liked to use more
plates than just two but with the thickness of PE and quantity I have
little choice but to have three sheets of 30 mill between two plates.
My next problem, what kinda oil does everyone use to insulate this. I
have seen mineral oil used, but I can only find it at Wall Mart, a tiny
bottle for $2. Were does everyone get large quantities of this? Or is
there some other oil - like transformer oil? I have been unable to
locate any transformer oil.
Any further help would be appreciated,
Mad Coiler
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