ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Recent Posts
VFD MotorFeeders
by gfretwell. 10/19/17 01:02 AM
Generator Cable Sizing
by brsele. 10/18/17 07:39 PM
What do you do?
by gfretwell. 10/17/17 01:08 AM
Good ol' copper pipe in the fuse holder trick
by HotLine1. 10/16/17 07:16 PM
Another generator question
by HotLine1. 10/16/17 07:02 PM
New in the Gallery:
Gallery Test
Popular Topics(Views)
241,410 Are you busy
177,380 Re: Forum
168,977 Need opinion
Who's Online Now
0 registered members (), 31 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#28702 - 08/28/03 04:40 PM UK's Turn  
Roger  Offline
Member
Joined: May 2002
Posts: 1,716
N.C.
This time it's in Pauls homeland. Lets hope nothing serious.

-- Major power outage hits south London, cutting subway service during evening rush hour.
Watch CNN or log on to http://CNN.com (AOL Keyword: CNN) for the latest news.


Work Gear for Electricians and the Trades

#28703 - 08/28/03 06:03 PM Re: UK's Turn  
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
Well, we haven't done it on quite the same scale as North America, but then everyone knows that everything is bigger in America! [Linked Image]

From the BBC News website:
Quote
The National Grid is investigating the cause of the fault but spokesman Sean Regan said any loss of power supply was "an unusual occurrence".

He added: "There was a fault in the 275,000 volt system affecting a ring around London, which occurred at 1826 BST.

"Power to the distribution network in London was restored at 1900 BST.

"Obviously it is going to take the regional distribution network some time to restore supplies to the end users of their system. Hopefully it shouldn't be long now."


Full story: http://news.bbc.co.uk/1/hi/england/london/3189755.stm


#28704 - 08/28/03 08:45 PM Re: UK's Turn  
Karl Riley  Offline
Member
Joined: Aug 2003
Posts: 24
Edgartown, MA, USA
I am beginning to think that Ring circuits are hazardous to our health. I believe the US outage was a Ring event also.

Karl


#28705 - 08/29/03 01:38 PM Re: UK's Turn  
C-H  Offline
Member
Joined: Sep 2002
Posts: 1,497
Stockholm, Sweden
Quote

I am beginning to think that Ring circuits are hazardous to our health.


Radials are worse. There was a major outage in the northern part of Stockholm, Sweden, one or two years ago, when a HV cable caught fire. The PoCo had to run a new cable above ground to get power back, which took days. A ring would have allowed you to supply at least some power to the area. Silly thing was that the same cable had failed a year before, with the same result. Slow learners... [Linked Image]

[This message has been edited by C-H (edited 08-29-2003).]


#28706 - 08/30/03 06:32 AM Re: UK's Turn  
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
Apparently EDF in France uses a double-shunt arrangement for MV distribution in the Paris region. There's no mention of whether they employ it on HV transmission as well.

www.ieconsult.fr/ect155.pdf (Look at pg. 12)




[This message has been edited by pauluk (edited 08-30-2003).]


#28707 - 08/30/03 06:51 AM Re: UK's Turn  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,223
SI,New Zealand
Paul and others,
Whether you like it or not, LV systems are run Underground as a Ring Circuit, before they feed a house, or even as an Over-head circuit.
Normally makes fusing a hell of a lot easier!
And yes, most of our U/G cables are Aluminium.
Even in a PME Installation, there are still Ring circuits!. [Linked Image]


#28708 - 09/07/03 09:00 AM Re: UK's Turn  
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
It looks as though the media coverage of the big U.S. blackout and the London power failure means that every small blip on the power grid is now going to result in demands for an inquiry:

Quote
An investigation has begun after parts of central Liverpool lost their power supply.

The power cut happened just before 1200 BST on Friday.

Shops and offices were affected for just a few seconds.


http://news.bbc.co.uk/1/hi/england/merseyside/3084814.stm


[This message has been edited by pauluk (edited 09-07-2003).]



Member Spotlight
SafetyWired
SafetyWired
Pa, USA
Posts: 44
Joined: July 2013
Show All Member Profiles 
Featured:

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

 

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.021s Queries: 14 (0.003s) Memory: 0.7857 MB (Peak: 0.9368 MB) Zlib enabled. Server Time: 2017-10-20 14:25:37 UTC