ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Inspection camera help
by petey_c. 09/22/18 07:52 AM
Motion detectors and dimmers
by gfretwell. 09/20/18 04:02 PM
Extension cords
by annemarie1. 09/20/18 08:54 AM
220/230/240V 60Hz Systems
by gfretwell. 09/16/18 12:37 PM
Acronis Backup 2017
by gfretwell. 09/16/18 12:46 AM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 28 guests, and 19 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
HV lines #212120
12/14/13 01:21 PM
12/14/13 01:21 PM
B
boora2  Offline OP
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
Re: HV lines [Re: boora2] #212121
12/14/13 01:59 PM
12/14/13 01:59 PM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,289
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
Re: HV lines [Re: boora2] #212122
12/14/13 02:12 PM
12/14/13 02:12 PM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,289
Estero,Fl,usa
These are not really as low as they look but there is plenty of sag there.
[Linked Image]


Greg Fretwell
Re: HV lines [Re: boora2] #212123
12/14/13 02:27 PM
12/14/13 02:27 PM
B
boora2  Offline OP
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.

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

Member
Joined: Jul 2004
Posts: 9,289
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
Re: HV lines [Re: boora2] #212132
12/15/13 12:43 PM
12/15/13 12:43 PM
M
mbhydro  Offline
Member
Joined: Feb 2003
Posts: 350
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.


Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Joe Tedesco
Joe Tedesco
Boston, Massachusetts USA
Posts: 2,749
Joined: October 2000
Show All Member Profiles 
Top Posters(30 Days)
Admin 13
Trumpy 11
Popular Topics(Views)
249,378 Are you busy
187,310 Re: Forum
176,652 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.019s Queries: 15 (0.003s) Memory: 0.9769 MB (Peak: 1.1258 MB) Zlib enabled. Server Time: 2018-09-22 18:48:05 UTC