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ekstra   ara
 Post subject: Inclusion of auto transformers in arc flash analysis
PostPosted: Thu Jun 11, 2015 12:10 am 

Joined: Wed Jun 10, 2015 11:48 pm
Posts: 1
I am modelling a small 415V network for an arc flash study. Three motors, 1 x 45kW and 2 x 90kW are started via an auto-transformer starter.

Will the auto-transformer contribute anything to the arc flash study, or can I look at a worse case scenario, and consider the motors starting DOL?

If the auto-transformer needs to be included in the study - what characteristics do I need to include?


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 Post subject: Re: Inclusion of auto transformers in arc flash analysis
PostPosted: Thu Jul 02, 2015 10:30 pm 
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Joined: Tue Oct 26, 2010 9:08 am
Posts: 2174
Location: North Carolina
Shouldn,'t add anything if its out of the circuit during normal operating conditions.


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