ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

Topic Options
Rate This Topic
#212120 - 12/14/13 09:21 AM HV lines
boora2 Offline
Member
Registered: 06/07/12
Posts: 15
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)
Top
Work Gear for Electricians and the Trades
#212121 - 12/14/13 09:59 AM Re: HV lines [Re: boora2]
gfretwell Online   content


Member
Registered: 07/20/04
Posts: 9039
Loc: Estero,Fl,usa
IAEI did an article about this several years ago.

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


Member
Registered: 07/20/04
Posts: 9039
Loc: Estero,Fl,usa
These are not really as low as they look but there is plenty of sag there.
_________________________
Greg Fretwell
Top
#212123 - 12/14/13 10:27 AM Re: HV lines [Re: boora2]
boora2 Offline
Member
Registered: 06/07/12
Posts: 15
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.
Top
#212125 - 12/14/13 11:27 AM Re: HV lines [Re: boora2]
gfretwell Online   content


Member
Registered: 07/20/04
Posts: 9039
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.
_________________________
Greg Fretwell
Top
#212132 - 12/15/13 08:43 AM Re: HV lines [Re: boora2]
mbhydro Offline
Member
Registered: 02/21/03
Posts: 347
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.
Top

Member Spotlight
Member Since: 05/03/03
Posts: 1137
New in the Gallery:
SE cable question
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box


Who's Online
1 registered (HotLine1), 81 Guests and 8 Spiders online.
Key: Admin, Global Mod, Mod
 
New in the Gallery:
SE cable question
 
Top Posters (30 Days)
Admin 47
HotLine1 43
gfretwell 19
Ruben Rocha 12
Trumpy 9
 
Newest Members
KrmtFrg, Stack, Scotto, Freecrowder, clee512

ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals