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

ECN Shout Chat
Top Posters(30 Days)
Admin 19
Recent Posts
fuse rejectors
by NORCAL. 03/29/17 01:44 AM
Old decora style outlets
by NORCAL. 03/29/17 01:41 AM
NFPA stuff
by gfretwell. 03/28/17 08:08 PM
Anyone hiring inspectors?
by HotLine1. 03/27/17 08:03 AM
ESA Arc flash course
by TheShockDoctors. 03/24/17 10:15 AM
New in the Gallery:
SE cable question
Popular Topics(Views)
231,908 Are you busy
166,781 Re: Forum
160,892 Need opinion
Who's Online Now
1 registered members (HotLine1), 55 guests, and 16 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#58951 - 11/23/05 10:58 PM Cool Video  
sierra electrician  Offline
Member
Joined: Feb 2005
Posts: 219
North Fork, CA USA


Work Gear for Electricians and the Trades

#58952 - 11/24/05 06:38 AM Re: Cool Video  
ShockMe77  Offline
Member
Joined: Jun 2005
Posts: 821
Rahway, New Jersey
Damn.... the second video of that sub-station going up in flames is incredible! Scary stuff.


#58953 - 11/24/05 09:40 AM Re: Cool Video  
kdal  Offline
Member
Joined: Sep 2005
Posts: 34
Florida,U.S.A.
WOW !


#58954 - 11/24/05 02:17 PM Re: Cool Video  
golf junkie  Offline
Member
Joined: Apr 2001
Posts: 507
York, NE
Cool stuff, thanks for a great link.


#58955 - 12/22/05 07:19 AM Re: Cool Video  
RODALCO  Offline
Member
Joined: Dec 2005
Posts: 854
Titirangi, Akld, New Zealand
Lost for words, impressive video clips. thanks


The product of rotation, excitation and flux produces electricty.

#58956 - 12/22/05 11:41 AM Re: Cool Video  
Edward  Offline
Member
Joined: Dec 2002
Posts: 308
California
From what i have understood from my classes is:
In order to open a high voltage and high current switch it must be done extremely fast and the blades of the switch must be rounded. and when closing one it also must close fast.

Right?

Edward


Thanks
Edward

#58957 - 12/22/05 12:20 PM Re: Cool Video  
winnie  Offline
Member
Joined: Sep 2003
Posts: 649
boston, ma
Edward,

Exactly right. This was discussed in this thread http://electrical-contractor.net/ubb/Forum1/HTML/006650.html

The open air links that you see moving slowly are _not_ supposed to interrupt the load, and are not suitable as a switch for these high voltages and currents. The actual switches are in what appear to be insulators on the right hand side of the assembly. One of these failed to open, leaving the visible moving bits to open the circuit...which by demonstration they cannot do.

-Jon


#58958 - 12/23/05 01:55 AM Re: Cool Video  
mxslick  Offline
Member
Joined: Oct 2004
Posts: 803
Atomic City, ID USA
Quote
Damn.... the second video of that sub-station going up in flames is incredible! Scary stuff.


Some notes on that video:

The failure started as stated on the "low voltage" side of the sub, supposedly with a capicator bank failure;

It was not cleared by the substation's protection relay scheme because a $20.00 fuseholder for the relay failed. (That particular brand/type of fuseholder was found to be a problem at substations all over the U.S.);

The boiling oil being shot out of the pressure reliefs caused the major fireball near the end of the video; (it looks like water but there were no firefighters anywhere near that thing during the arcing fault phase)

The blue flash and loud bang is the transformer's expulsion fuse filally blowing and killing the power.

Now after seeing that video how would you like to live next to a substation? [Linked Image] I have a friend here in So Cali who lives next to one and he tells me the noises coming from the sub as breakers and reclosers operate during an earthquake is the stuff of nightmares.


Stupid should be painful.


Member Spotlight
watersparkfalls
watersparkfalls
Washington...Not DC
Posts: 216
Joined: March 2005
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.014s Queries: 14 (0.003s) Memory: 0.7900 MB (Peak: 0.9504 MB) Zlib enabled. Server Time: 2017-03-31 00:36:51 UTC