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Cool Video #58951
11/23/05 09:58 PM
11/23/05 09:58 PM
S
sierra electrician  Offline OP
Member
Joined: Feb 2005
Posts: 219
North Fork, CA USA

Work Gear for Electricians and the Trades
Re: Cool Video #58952
11/24/05 05:38 AM
11/24/05 05:38 AM
S
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.

Re: Cool Video #58953
11/24/05 08:40 AM
11/24/05 08:40 AM
K
kdal  Offline
Member
Joined: Sep 2005
Posts: 34
Florida,U.S.A.
WOW !

Re: Cool Video #58954
11/24/05 01:17 PM
11/24/05 01:17 PM
G
golf junkie  Offline
Member
Joined: Apr 2001
Posts: 507
York, NE
Cool stuff, thanks for a great link.

Re: Cool Video #58955
12/22/05 06:19 AM
12/22/05 06:19 AM
R
RODALCO  Offline
Member
Joined: Dec 2005
Posts: 856
Titirangi, Akld, New Zealand
Lost for words, impressive video clips. thanks


The product of rotation, excitation and flux produces electricty.
Re: Cool Video #58956
12/22/05 10:41 AM
12/22/05 10:41 AM
E
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
Re: Cool Video #58957
12/22/05 11:20 AM
12/22/05 11:20 AM
W
winnie  Offline
Member
Joined: Sep 2003
Posts: 649
boston, ma
Edward,

Exactly right. This was discussed in this thread https://www.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

Re: Cool Video #58958
12/23/05 12:55 AM
12/23/05 12:55 AM
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.

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