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jasen
science forum beginner
Joined: 28 Jun 2006
Posts: 16
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 Posted: Wed Jun 28, 2006 11:35 am Post subject:
Re: Casariego´s Formula
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On 2006-06-27, Paul Ciszek <nospam@nospam.com> wrote:
| Quote: |
In article <449E86F5.948EFB4C@antispamtesco.net.invalid>,
Frederick Williams <Frederick.Williams1@antispamtesco.net.invalid> 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)?
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330Kv takes quite a lot of insulation.
thats why the use long insulators
Bye.
Jasen |
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Mike Amling
science forum Guru
Joined: 05 May 2005
Posts: 525
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| Posted: Tue Jun 27, 2006 8:01 pm Post subject:
Re: Casariego´s Formula
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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)?
--
Please reply to: | "Any sufficiently advanced incompetence is
pciszek at panix dot com | indistinguishable from malice."
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Frederick Williams
science forum addict
Joined: 19 Nov 2005
Posts: 97
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| Posted: Sun Jun 25, 2006 12:50 pm Post subject:
Re: Casariego´s Formula
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nigro wrote:
"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
adverse stress conditions."
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. |
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nigro
science forum beginner
Joined: 24 Jun 2006
Posts: 1
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| Posted: Sat Jun 24, 2006 10:56 am Post subject:
Casariego´s Formula
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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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