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 Post subject: High Incident Energy on 208/120 V Panels
PostPosted: Thu Mar 24, 2011 3:16 pm 

Joined: Tue Feb 17, 2009 11:04 am
Posts: 37
Can anyone give me an idea, why I would be receiving a higher incident energy on the 208/120 V secondary? On the 480/277 panels I have a lot of Category 2. On the 208/120, I have a lot of 3's and a couple 4's. The initial transformer is 2500 kva with 6% impedance. The second transformer is 750 VA, I'm not sure of the impedence. Any help would be greatly appreciated.


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PostPosted: Sun Mar 27, 2011 5:48 pm 
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Joined: Mon Sep 17, 2007 5:00 pm
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Location: Scottsdale, Arizona
Incident Energy

Vica1ME wrote:
Can anyone give me an idea, why I would be receiving a higher incident energy on the 208/120 V secondary? On the 480/277 panels I have a lot of Category 2. On the 208/120, I have a lot of 3's and a couple 4's. The initial transformer is 2500 kva with 6% impedance. The second transformer is 750 VA, I'm not sure of the impedence. Any help would be greatly appreciated.


It sounds like the problem might be with a long clearing time by the transformer primary device. Check your Category 3's and 4's and see what protective device is being referenced (i.e. primary?) and then check to see what clearing time the software is using. Most programs have tables that list all of this information.

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Brainfiller.com


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