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Have you made any permanent device setting changes due the the arc flash study?
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 Post subject: Device setting changes due to arc flash study
PostPosted: Sun Nov 14, 2010 6:26 pm 
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Joined: Mon Sep 17, 2007 5:00 pm
Posts: 1637
Location: Scottsdale, Arizona
Have you made any permanent device setting changes due to the results of an arc flash study?

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Jim Phillips, P.E.
Brainfiller.com


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PostPosted: Wed Dec 29, 2010 9:01 pm 
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Joined: Thu Oct 18, 2007 7:10 pm
Posts: 263
Location: NW USA
Yes, and at one location we found many, many inconsistencies, left as a legacy to many previous engineers all having different philosophies. It was amazing and only due to good luck that the plant was not experiencing continuous expensive outages. I point to this as a money saving benefit achieved thru arc flash study.


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PostPosted: Thu Jan 13, 2011 9:44 am 
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Joined: Thu Jan 10, 2008 8:49 pm
Posts: 510
Location: New England
Yes, at the facility I am at now, we added Inst trip to switchgear breakers which previously only had short time. Based upon fault current, we set the Inst to trip at 80% of expect fault. This actually led to us losing coordination with down stream devices. However, we collectively felt that the benefits of day to day low IE levels on our MCCs, outwayed the 1 in 10 year event of one large motor that couldn't be coordinated and would trip to switchgear breaker on a bolted fault.

All of life is a compromise!


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