ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Al Hildenbrand - Minneapolis - obituary
by Bill Addiss - 02/03/23 07:38 PM
Violation?
by renosteinke - 01/27/23 09:52 PM
Does NEC 551.71 (F) apply to dwellings?
by BigB - 01/20/23 10:46 AM
Power submeter connections
by HotLine1 - 01/19/23 09:09 AM
New in the Gallery:
Burger King crown sillyness
Burger King crown sillyness
by wa2ise, December 11
240/208 to a house
240/208 to a house
by wa2ise, October 9
Who's Online Now
0 members (), 27 guests, and 11 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#129097 07/23/04 11:45 PM
Joined: Feb 2004
Posts: 7
A
Junior Member
Several years ago, Niagara Mohawk had an exhibit building at the Erie County Fair (Hamburg NY). On display were various types and sizes of high tension insulators. The guide explained high voltage power transmission-- generalizing, of course. He did mention the set of 450kV lines that run the length of New York State are the highest voltage lines in use in North America (circa mid-1990's). He did say that NiMo built an experimental 900kV line near Syracuse NY, but the line was never energized, not even as a test. I want to know why? Was the whole thing just impractical because the 450kV lines are doing a fine job? Or did they fear something Tesla-onian might happen at such a hyper-voltage? E-mail inquiries to NiMo have gone unanswered.

#129098 07/24/04 09:40 PM
Joined: Apr 2002
Posts: 2,527
B
Moderator
There are several 1,000kV {one megavolt} DC lines in routine service on the North American continent. The upper end for 60Hz is generally 1,200kV AC (UHV class) but not considered technically [and economically} practical.

For 60Hz, the functional maximum in IEEE Standard 1312 is 800kV {3ΓΈ} with a nominal rating of 765kV (EHV class - includes 345 and 500 kV).

#129099 10/15/04 05:43 PM
Joined: May 2003
Posts: 26
I
Member
Georgia has had 500 kv transmission lines since about 1972, so I think the NiMo source is incorrect.

#129100 10/15/04 07:32 PM
Joined: Feb 2004
Posts: 7
A
Junior Member
I'm not questioning whether or not lines in excess of 450kV are in use. I'm just amazed at NiMo's abandonment of the project. What were their reasons?

#129101 10/21/04 01:01 AM
Joined: Sep 2003
Posts: 200
U
Member
500kV in use up here in BC, Canada... since 1968 [Linked Image]
http://www.bchydro.com/info/system/system15244.html


Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *
2023 National Electrical Code (NEC)
2023 NEC Now Available!
 
* * * * * * *

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

 

Member Spotlight
noderaser
noderaser
Portland, Oregon, United States
Posts: 404
Joined: March 2007
Top Posters(30 Days)
triple 3
Popular Topics(Views)
303,231 Are you busy
232,223 Re: Forum
216,961 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5