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#212120 12/14/13 12:21 PM
Joined: Jun 2012
Posts: 15
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boora2 Offline OP
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Was in Victoria a few months ago,near a line carrying 1400kV,rain started falling,steam pouring off the wires,my daughter said look at that told her,these lines run at 100c temp rise over ambient at full load,6 hours duration,then sag can become an issue,is this the same in the US.

Last edited by boora2; 12/14/13 12:23 PM.
boora2 #212121 12/14/13 12:59 PM
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IAEI did an article about this several years ago.

http://www.iaei.org/blogpost/890108...=%22power+and+line+and+sag%22&terms=


Greg Fretwell
boora2 #212122 12/14/13 01:12 PM
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These are not really as low as they look but there is plenty of sag there.
[Linked Image from gfretwell.com]


Greg Fretwell
boora2 #212123 12/14/13 01:27 PM
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boora2 Offline OP
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By Christ they look low,if a leopard came by looking for a deer,he'd prolly loose his spots.

boora2 #212125 12/14/13 02:27 PM
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They are going across a valley so the ground is low under them. They still had a whole lot of sag. I wondered how they did not cross in a wind.


Greg Fretwell
boora2 #212132 12/15/13 11:43 AM
Joined: Feb 2003
Posts: 368
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Our utility has an aggressive nip and tuck program to reduce sag which improves safety and can allow an increase in the summer line loading.

They use a special radar on a helicopter to survey the right of way including the sag and then decide what needs to be tightened up.


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