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 Post subject: Harmonic Content in an Arc
PostPosted: Wed Oct 10, 2018 11:26 am 

Joined: Fri Jun 22, 2018 8:26 am
Posts: 6
I'm curious if there has been research done on studying the harmonic content of an arc. I would like to know because I have seen some electronic relays with second harmonic blocking and I'm unsure if this would block the relay from tripping for an arcing fault.


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 Post subject: Re: Harmonic Content in an Arc
PostPosted: Thu Oct 11, 2018 2:46 pm 
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Joined: Tue Oct 26, 2010 9:08 am
Posts: 2174
Location: North Carolina
The research I've seen done was focussed on using the wave shape as a means of detecting arcing faults. At low voltages (AFCI's) this works quite well but the lack of devices and the prevalence of other detection means indicates that it is not so successful at higher voltages.


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 Post subject: Re: Harmonic Content in an Arc
PostPosted: Mon Oct 15, 2018 10:48 am 

Joined: Mon Dec 07, 2015 9:45 am
Posts: 33
Location: Massachusetts
If I remember correctly, Albert Marroquin, VP at etap, had some information on harmonics in arc fault currents. It looked pretty typical odd order. That said, the second order blocking is done in software, so I have to imagine if it did have an affect on arc fault sensing they would not enable the blocking there.


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 Post subject: Re: Harmonic Content in an Arc
PostPosted: Mon Oct 15, 2018 6:11 pm 

Joined: Fri Jun 22, 2018 8:26 am
Posts: 6
I have met Albert before. I'll give him a call and see what he thinks. I may also reach out to some engineers at SEL


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