ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
High current GFI vs regular GFCI
by gfretwell. 11/16/18 01:45 AM
This anti-theist is priceless!!!
by djk. 11/14/18 07:19 AM
Single phase and what you call it.
by dsk. 11/12/18 11:10 AM
220/230/240V 60Hz Systems
by Albert. 11/07/18 12:48 AM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 27 guests, and 25 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
HV lines #212120
12/14/13 12:21 PM
12/14/13 12:21 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 12:23 PM.
Work Gear for Electricians and the Trades
Re: HV lines [Re: boora2] #212121
12/14/13 12:59 PM
12/14/13 12:59 PM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,302
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 01:12 PM
12/14/13 01:12 PM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,302
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 01:27 PM
12/14/13 01:27 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 02:27 PM
12/14/13 02:27 PM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,302
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 11:43 AM
12/15/13 11:43 AM
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
Grover
Grover
Sebago, ME, USA
Posts: 109
Joined: January 2005
Show All Member Profiles 
Top Posters(30 Days)
Admin 8
Popular Topics(Views)
251,506 Are you busy
188,682 Re: Forum
178,386 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.021s Queries: 15 (0.004s) Memory: 0.9769 MB (Peak: 1.1258 MB) Zlib enabled. Server Time: 2018-11-16 13:53:00 UTC