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Halifax, Nova Sco
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Hi Chris, Steve & All, Aug 30, 2012
Yes the capacitance of the cable would store electricity but (and =
here I venture onto thin ice) the magnitude of this storage would be =
vanishingly small.=20
From here onward the ice is even thinner--
As a first approximation, when the DC source is removed then the =
voltage between the two ends of the cable would not decrease to zero =
immediately but would fall asymptotically as charge is drained from the =
coaxial sheath.
The charge delivered to the destination/sec, before removal of the =
DC source, would be roughly 3 x 10^10 times as great as the charge =
delivered by discharge of the cable. =20
Yt, DW, Kentville
----- Original Message -----=20
From: Christopher Majka=20
To: naturens@chebucto.ns.ca=20
Sent: Thursday, August 30, 2012 10:14 AM
Subject: Re: [NatureNS] wind power storage
Hi Steve,
"Long undersea / underground high voltage cables have a high =
electrical capacitance compared with overhead transmission lines, since =
the live conductors within the cable are surrounded by a relatively thin =
layer of insulation (the dielectric), and a metal sheath. The geometry =
is that of a long co-axial capacitor. The total capacitance increases =
with the length of the cable. This capacitance appears in parallel with =
the load."
Does this indicate that the capacitance of cable itself can store =
electricity or am I completely off-base? ;~>
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<META content=3D"text/html; charset=3Diso-8859-1" =
http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.19298">
<STYLE></STYLE>
</HEAD>
<BODY=20
style=3D"WORD-WRAP: break-word; -webkit-nbsp-mode: space; =
-webkit-line-break: after-white-space"=20
bgColor=3D#ffffff>
<DIV><FONT size=3D2>Hi Chris, Steve & All, =20
=
=20
Aug 30, 2012</FONT></DIV>
<DIV><FONT size=3D2> Yes the capacitance of the cable =
would=20
store electricity but (and here I venture onto thin ice) the =
magnitude of=20
this storage would be vanishingly small. </FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2> From here onward the ice is even=20
thinner--</FONT></DIV>
<DIV><FONT size=3D2> As a first approximation, when =
the DC=20
source is removed then the voltage between the two ends =
of the=20
cable would not decrease to zero immediately but would fall =
asymptotically as=20
charge is drained from the coaxial sheath.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2> The charge delivered to the=20
destination/sec, before removal of the DC source, would be roughly =
3 x=20
10^10 times as great as the charge delivered by discharge of the=20
cable. </FONT> </DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Yt, DW, Kentville</FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; =
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px"=20
dir=3Dltr>
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: =
black"><B>From:</B>=20
<A title=3Dc.majka@ns.sympatico.ca=20
href=3D"mailto:c.majka@ns.sympatico.ca">Christopher Majka</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dnaturens@chebucto.ns.ca=20
href=3D"mailto:naturens@chebucto.ns.ca">naturens@chebucto.ns.ca</A> =
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Thursday, August 30, 2012 =
10:14=20
AM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: [NatureNS] wind =
power=20
storage</DIV>
<DIV><FONT size=3D2></FONT><BR></DIV>Hi Steve,
<DIV><FONT size=3D2></FONT><BR></DIV>
<DIV><FONT size=3D2></FONT><FONT size=3D2></FONT><BR></DIV>
<DIV>"Long undersea / underground high voltage cables have a =
high=20
electrical capacitance compared with overhead transmission =
lines,=20
since the live conductors within the cable are surrounded by a =
relatively thin=20
layer of insulation (the dielectric), and a metal sheath. The =
geometry is=20
that of a long co-axial capacitor. The total capacitance =
increases with=20
the length of the cable. This capacitance appears in parallel with the =
load."</DIV>
<DIV><FONT size=3D2></FONT><FONT size=3D2></FONT><BR></DIV>
<DIV>Does this indicate that the capacitance of cable itself can store =
electricity or am I completely off-base? ;~></DIV>
<DIV><FONT size=3D2></FONT><FONT size=3D2></FONT><BR></DIV>
<DIV><FONT size=3D2></FONT> </DIV></BLOCKQUOTE></BODY></HTML>
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