The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Industrail Control Panel bonding per 409.108
by sparkyinak
Yesterday at 06:29 PM
Calling all Non-US members!! (Non-US only)
by aussie240
12/07/16 02:39 AM
Photo Upload Tutorial
by DanK
12/06/16 11:35 PM
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 13
HotLine1 10
sparkyinak 9
Texas_Ranger 8
Potseal 6
Who's Online
0 registered (), 186 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#28702 - 08/28/03 01:40 PM UK's Turn
Roger Offline
Member

Registered: 05/18/02
Posts: 1779
Loc: 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.

Top
Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#28703 - 08/28/03 03:03 PM Re: UK's Turn
pauluk Offline
Member

Registered: 08/11/01
Posts: 7693
Loc: 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!

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

Top
#28704 - 08/28/03 05:45 PM Re: UK's Turn
Karl Riley Offline
Member

Registered: 08/26/03
Posts: 24
Loc: 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

Top
#28705 - 08/29/03 10:38 AM Re: UK's Turn
C-H Offline

Member

Registered: 09/17/02
Posts: 1508
Loc: 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...

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

Top
#28706 - 08/30/03 03:32 AM Re: UK's Turn
pauluk Offline
Member

Registered: 08/11/01
Posts: 7693
Loc: 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).]

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

Member

Registered: 07/05/02
Posts: 8540
Loc: 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!.
_________________________
Let's face it, these days if you're not young, you're old - Red Green grin

Top
#28708 - 09/07/03 06:00 AM Re: UK's Turn
pauluk Offline
Member

Registered: 08/11/01
Posts: 7693
Loc: 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).]

Top



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals