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#212120 - 12/14/13 09:21 AM HV lines
boora2 Offline
Member

Registered: 06/07/12
Posts: 17
Loc: 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.


Edited by boora2 (12/14/13 09:23 AM)

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#212121 - 12/14/13 09:59 AM Re: HV lines [Re: boora2]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
IAEI did an article about this several years ago.

http://www.iaei.org/blogpost/890108/1485...g%22&terms=
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#212122 - 12/14/13 10:12 AM Re: HV lines [Re: boora2]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
These are not really as low as they look but there is plenty of sag there.
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#212123 - 12/14/13 10:27 AM Re: HV lines [Re: boora2]
boora2 Offline
Member

Registered: 06/07/12
Posts: 17
Loc: 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.

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#212125 - 12/14/13 11:27 AM Re: HV lines [Re: boora2]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: 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.
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#212132 - 12/15/13 08:43 AM Re: HV lines [Re: boora2]
mbhydro Offline
Member

Registered: 02/21/03
Posts: 344
Loc: 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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