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 Post subject: 48vDC to 480vAC
PostPosted: Tue Apr 17, 2012 10:38 am 

Joined: Tue Apr 03, 2012 11:00 am
Posts: 4
Am working on hazards associated with equipment that uses an AC inverter to produce 480vAC from a 48vDC storage battery supply. Does anyone have information on this topic.

JW48


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PostPosted: Tue Apr 17, 2012 3:22 pm 
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Joined: Thu Jul 07, 2011 6:03 am
Posts: 64
Location: Netherlands
Inverters have a low current limit when a fault occurs - in the order of 200% nominal current - and switch off by themselves after a short time. If this is the only source in the system your arc flash hazard analysis will be mainly figuring out how big the bolted fault current is, and if your protective devices are able to pick up on arcing faults. Try to get detailed data from the manufacturer on how the inverter responds to faults.

Note that the lower limit on IEEE 1584's equations is 700A, so you may not be able to use them.


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PostPosted: Mon Apr 23, 2012 4:58 am 

Joined: Tue Apr 03, 2012 11:00 am
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jvrielink wrote:
Inverters have a low current limit when a fault occurs - in the order of 200% nominal current - and switch off by themselves after a short time. If this is the only source in the system your arc flash hazard analysis will be mainly figuring out how big the bolted fault current is, and if your protective devices are able to pick up on arcing faults. Try to get detailed data from the manufacturer on how the inverter responds to faults.

Note that the lower limit on IEEE 1584's equations is 700A, so you may not be able to use them.

Thanks for the advice. Am contacting the manufacturer.


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