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)
241,448 Are you busy
177,431 Re: Forum
169,014 Need opinion
Who's Online Now
0 registered members (), 48 guests, and 12 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#146112 - 10/20/06 08:49 AM Watching Uk Grid  
Happy Birthday Kenbo  Offline
Member
Joined: Apr 2006
Posts: 233
Scotland
Looking for stuff about the grid for my students when I came accross this site.

Watching the grid

Silly to sit and watch a needle move but it what it represents I thought facinating [Linked Image]


der Gro├čvater

Test Equipment:
Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement
Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement

#146113 - 10/20/06 11:57 AM Re: Watching Uk Grid  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,223
SI,New Zealand
Kenny,
That's pretty cool!. [Linked Image]
I've seen the effects of the wrong frequency on a power system first-hand.
Our NZ (SI) members may remember back in 1992, when there was a problem at one of the Tekapo (I think) power stations and one of the alternators began what's known as "hunting" (speeding up and slowing down wildly).
Reason I say South Island only is because any power sent to the north is rectified into DC first.
This hunting effect caused a really eerie pulsing of the lights in peoples houses and caused quite a few problems with TV's and the like.
The pulsing was quite noticeable and so I'm told, Power companies recieved thousands of calls from concerned consumers.
Just goes to show what can happen when you have one errant alternator in a system.
And so I've learned since, it takes quite a bit of effort to get the alternator settled back into a steady speed again too.
Would have been interesting being a fly on the wall in the control room that night!. [Linked Image]


#146114 - 10/20/06 05:04 PM Re: Watching Uk Grid  
johno12345  Offline
Member
Joined: Sep 2005
Posts: 96
United Kingdom
I like watching this link http://www.nationalgrid.com/uk/Electricity/Data/Realtime/Demand/Demand60.htm
It shows the UK demand in real time. It jumps up at 1 am when our economy 7 supplies kick in.


I took my time, I hurried up, The choice was mine, I didn't think enough

#146115 - 10/21/06 04:58 AM Re: Watching Uk Grid  
RODALCO  Offline
Member
Joined: Dec 2005
Posts: 854
Titirangi, Akld, New Zealand
Very interesting guys, thanks for giving those links.
Raymond


The product of rotation, excitation and flux produces electricty.

#146116 - 10/22/06 07:09 AM Re: Watching Uk Grid  
djk  Offline
Member
Joined: Dec 2002
Posts: 1,237
Ireland
http://www.eirgrid.ie/EirgridPortal...;TreeLinkModID=1451&TreeLinkItemID=7

This isn't quite as flashy as a needle indicator, but it brings up list of various demand / supply tables etc for any given day in Ireland.

Gives you an idea of rate of increase in consumption : Weekly peaks for a few years.
http://www.eirgrid.ie/EirgridPortal...TreeLinkModID=1451&TreeLinkItemID=11



[This message has been edited by djk (edited 10-22-2006).]


#146117 - 10/22/06 06:33 PM Re: Watching Uk Grid  
Alan Belson  Offline
Member
Joined: Mar 2005
Posts: 1,803
Mayenne N. France
Ken, I managed to stop looking at that stupid meter long enough to read on a bit. Seems they are looking at devices [for refrigerators etc.] that turn off when the hz is down and on again when it's up, and hope to eventually have these on lots of consumer products.
I imagined some wild future where every appliance sold has this switch, with everything electrical in the UK going on and off like a harlot's drawers, and the Poco desperately trying to keep the grid balanced! ROFL [Linked Image]

Alan [ formerly known as Doris ]


Wood work but can't!

#146118 - 10/23/06 03:26 AM Re: Watching Uk Grid  
Happy Birthday Kenbo  Offline
Member
Joined: Apr 2006
Posts: 233
Scotland
Alan [ formerly known as Doris ]

I think the idea is mainly for industrial users who recive large electric bill when they cause an imbalance on the load factor. If I remember rightly reigerators as capacitor start motors. But most mottors will make the phase lagg when running.

djk

I like the historical data on that site. Compare 25-12-2005 with a normal week day intresting

johno12345

Cool liked that site also


der Gro├čvater


Member Spotlight
Attic Rat
Attic Rat
Bergen Co.,N.J. USA
Posts: 524
Joined: December 2003
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: 0.018s Queries: 14 (0.004s) Memory: 0.7874 MB (Peak: 0.9432 MB) Zlib enabled. Server Time: 2017-10-22 20:58:42 UTC