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#212120 - 12/14/13 01:21 PM HV lines  
boora2  Offline
Member
Joined: Jun 2012
Posts: 15
Mt Pritchard,Sydney, New South...
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 01:23 PM.

Work Gear for Electricians and the Trades

#212121 - 12/14/13 01:59 PM Re: HV lines [Re: boora2]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,069
Estero,Fl,usa
IAEI did an article about this several years ago.

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


Greg Fretwell

#212122 - 12/14/13 02:12 PM Re: HV lines [Re: boora2]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,069
Estero,Fl,usa
These are not really as low as they look but there is plenty of sag there.
[Linked Image]


Greg Fretwell

#212123 - 12/14/13 02:27 PM Re: HV lines [Re: boora2]  
boora2  Offline
Member
Joined: Jun 2012
Posts: 15
Mt Pritchard,Sydney, New South...
By Christ they look low,if a leopard came by looking for a deer,he'd prolly loose his spots.


#212125 - 12/14/13 03:27 PM Re: HV lines [Re: boora2]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,069
Estero,Fl,usa
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

#212132 - 12/15/13 12:43 PM Re: HV lines [Re: boora2]  
mbhydro  Offline
Member
Joined: Feb 2003
Posts: 347
Winnipeg MB Canada
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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