ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
From an outsider- How does tipping work?
by gfretwell - 12/02/20 02:38 PM
Happy Thanksgiving
by Trumpy - 12/02/20 04:11 AM
Where is Everyone?
by Trumpy - 12/02/20 03:51 AM
What does your work place look like?
by Trumpy - 12/02/20 03:42 AM
Ground fault remover :-)
by dsk - 11/30/20 03:51 AM
New in the Gallery:
Facebook follies, bad wiring
FPE in Germany pt.2
Who's Online Now
0 registered members (), 23 guests, and 11 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
HV lines #212120 12/14/13 12:21 PM
Joined: Jun 2012
Posts: 15
B
boora2 Offline OP
Member
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
Joined: Jul 2004
Posts: 9,547
G
gfretwell Online Content
Member
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
Joined: Jul 2004
Posts: 9,547
G
gfretwell Online Content
Member
These are not really as low as they look but there is plenty of sag there.
[Linked Image from gfretwell.com]


Greg Fretwell
Re: HV lines [Re: boora2] #212123 12/14/13 01:27 PM
Joined: Jun 2012
Posts: 15
B
boora2 Offline OP
Member
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
Joined: Jul 2004
Posts: 9,547
G
gfretwell Online Content
Member
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
Joined: Feb 2003
Posts: 359
M
mbhydro Offline
Member
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:

2020 National Electrical Code
2020 National Electrical
Code (NEC)

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Potseal
Potseal
Saskatchewan
Posts: 264
Joined: February 2013
Show All Member Profiles 
Top Posters(30 Days)
Trumpy 20
Popular Topics(Views)
272,206 Are you busy
206,091 Re: Forum
194,097 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3