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ekstra   ara
 Post subject: VFD and Input Filter
PostPosted: Wed Nov 13, 2019 9:10 am 

Joined: Thu Jun 09, 2016 6:17 pm
Posts: 6
Hello,

I am currently modeling an MCC lineup with internal VFDs which have input filters. It appears the filters are MTE Matrix passive filters constructed of an inductor and capacitor configuration. The VFDs are not regen and do not have a bypass option, therefore motor contribution will be neglected. Additionally, nothing downstream of the VFD will require labeling. With that said, is there any reason to model the filter and/or VFD from an arc flash analysis standpoint? I understand that modeling for other system studies could be beneficial at a later date.

Thanks.


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 Post subject: Re: VFD and Input Filter
PostPosted: Mon Nov 25, 2019 9:01 am 
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Joined: Tue Oct 26, 2010 5:00 pm
Posts: 188
Location: Maple Valley, WA.
If you are performing only an Arc Flash study, then you would not need to model the VFD and filter. This is because the input to the filter/VFD is going to have the highest AF energy. The energy value is equivalent to the main bus of the MCC.

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Robert Fuhr, P.E.; P.Eng.
PowerStudies


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 Post subject: Re: VFD and Input Filter
PostPosted: Mon Nov 25, 2019 9:07 am 
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Joined: Sat Apr 04, 2009 9:50 pm
Posts: 105
Location: San Antonio, TX
I agree.


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