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1 members (Scott35),
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Joined: Oct 2000
Posts: 3,682 Likes: 3
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Joined: Dec 2004
Posts: 23
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What is a "Pringle switch"? BTW, How long did they take to restore power?
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Joined: Dec 2005
Posts: 869 Likes: 4
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Amazing !!
LV faults near high capacity transformers 1 or 2 MVA or bigger have enormous amounts of power and destructive capacity as seen in these photo's.
Someone would have been very shaken and needed to change some un%$^s when closing that switch.
The product of rotation, excitation and flux produces electricty.
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Joined: Feb 2005
Posts: 361
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~~ CELTIC ~~ ...-= NJ =-...
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Joined: Mar 2005
Posts: 169
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Only one comment, Glad no one got hurt and WOW
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Joined: Nov 2001
Posts: 745
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What did the pringle switch look like after this "event"? I know virtually nothing about this type of switchgear. Is PPE required for someone operating this equipment (or at least a real good idea)?
Mike (mamills)
[This message has been edited by mamills (edited 10-11-2006).]
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Joined: Jul 2004
Posts: 129
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The plant has several Pingle switches.Most of them were installed mid 70s to late 80s. We have then on a RM program and we clean and lubricate the blades of the switches. We found that if you dont RM they may not open porperly. Ours are fused switches not electricaly operated . Pringles switches are bolted pressure contact switches and when the knives contact the stationary contacts they actualy have a cam on each knife that generates additional force to help ensure greater contact pressure. To those who have not seen a Pringle switch they look like a custom made device not something mass produced a lot of pride goes into them.
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Joined: Oct 2004
Posts: 806
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VAelec:
What was the cause of this failure, or are you not at liberty to say?
"Violent" is too small a term for this one.....
Stupid should be painful.
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Joined: Mar 2006
Posts: 52
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480V 4000A AL Duct in a 14 story building in Arlington, VA. Pringle switch tripped and was reset and a fireball consumed a good portion of the 14th floor. I'd venture to say they had two major failures. I think the first more obvious than the second...
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Posts: 356
Joined: August 2006
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