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Re: Glass cap with polyethylene
From: Alfred A. Skrocki[SMTP:alfred.skrocki-at-cybernetworking-dot-com]
Sent: Sunday, September 14, 1997 1:28 PM
To: Tesla List
Subject: Re: Glass cap with polyethylene
On Sunday, September 14, 1997 2:37 PM Bert Hickman
[SMTP:bert.hickman-at-aquila-dot-com] wrote;
> Alfred and all,
>
> Actually, it's when materials with a significant difference in
> dielectric constants are combined that an unequal share of stress occurs
> on the dielectric having the lower k. In the case of mineral oil and
> polyethylene, the k's are quite close (k of about 2 - 2.3), so there's
> no large discontinuity in the electrostatic fields. However, if you add
> glass (k of about 5 - 7), it will significantly increase the voltage
> stress on the LDPE and mineral oil. This is even worse for if you have
> any entrapped air (k=1).
In theory I can agree, BUT in practice if the polyethylene is thick
enough to handle the applied voltage no breakdown will occur
regardless if it is combined with glass or not.
Sincerely
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Alfred A. Skrocki
Alfred.Skrocki-at-CyberNetworking-dot-com
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