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jasen
science forum beginner

Joined: 28 Jun 2006
Posts: 16

Posted: Wed Jun 28, 2006 11:35 am    Post subject: Re: Casariego´s Formula

On 2006-06-27, Paul Ciszek <nospam@nospam.com> wrote:
 Quote: In article <449E86F5.948EFB4C@antispamtesco.net.invalid>, Frederick Williams wrote: In my country high voltage power lines are uninsulated and consist of a conductor made of aluminium wrapped round a steel core. The conductor is on the outside because of the skin effect and the steel provides the strength so that the lines can be strung from high pylons making insulation unnecessary. The problem of carrying water is altogether different. I can see how the insulation would not be needed under normal conditions, but occasionally you get foreign objects making contact with both the wire and the ground (kite strings) or the wire and the support structure (wildlife). Is a layer of insulation merely prohibitively expensive, or is it futile as well (i.e., the voltage is so high that any plastic coating would undergo dielectric breakdown)?

330Kv takes quite a lot of insulation.
thats why the use long insulators

Bye.
Jasen
Mike Amling
science forum Guru

Joined: 05 May 2005
Posts: 525

Posted: Tue Jun 27, 2006 8:01 pm    Post subject: Re: Casariego´s Formula

In article <449E86F5.948EFB4C@antispamtesco.net.invalid>,
Frederick Williams <Frederick.Williams1@antispamtesco.net.invalid> wrote:
 Quote: In my country high voltage power lines are uninsulated and consist of a conductor made of aluminium wrapped round a steel core. The conductor is on the outside because of the skin effect and the steel provides the strength so that the lines can be strung from high pylons making insulation unnecessary. The problem of carrying water is altogether different.

I can see how the insulation would not be needed under normal conditions,
but occasionally you get foreign objects making contact with both the
wire and the ground (kite strings) or the wire and the support structure
(wildlife). Is a layer of insulation merely prohibitively expensive, or
is it futile as well (i.e., the voltage is so high that any plastic
coating would undergo dielectric breakdown)?

--
pciszek at panix dot com | indistinguishable from malice."
Frederick Williams

Joined: 19 Nov 2005
Posts: 97

Posted: Sun Jun 25, 2006 12:50 pm    Post subject: Re: Casariego´s Formula

nigro wrote:
 Quote: Dear friends, please visit my web site: http://www.asturias.com/casariego and send me back your comment about it. Sorry and thanks for your time.

"The magnitude of the line will be dictated by the section of its wires,
the quality of its insulation and by its capacity to resist the most

In my country high voltage power lines are uninsulated and consist of a
conductor made of aluminium wrapped round a steel core. The conductor
is on the outside because of the skin effect and the steel provides the
strength so that the lines can be strung from high pylons making
insulation unnecessary. The problem of carrying water is altogether
different.

--
Remove "antispam" and ".invalid" for e-mail address.
nigro
science forum beginner

Joined: 24 Jun 2006
Posts: 1

 Posted: Sat Jun 24, 2006 10:56 am    Post subject: Casariego´s Formula Dear friends, please visit my web site: http://www.asturias.com/casariego and send me back your comment about it. Sorry and thanks for your time. Kind regards, Dr. Ing. Francisco Casariego/ Oviedo. Spain

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