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  #1  
Old 12-04-2003, 01:56 PM
afmcorp's Avatar
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I know someone has the answer

hello folks, sorry for the off topic question but i know someone out there has the answer or knows where i can go.

I need to calculate the Kva of a plasma cutter so i can bring in a transformer.

it's 460 volts

does anyone know where i can get this calculation??
tks
craig
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  #2  
Old 12-04-2003, 04:07 PM
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I found this on arcraft welding's site.

Input KVA single phase : Input voltage X Input current

Input KVA three phase : %3 X Voltage input X Input current

Input power :%3 X Voltage input X Input current X power factor

Output power : Output voltage X Output current

Output power : Input power X Efficiency

Arcraft Welding
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  #3  
Old 12-04-2003, 05:10 PM
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tks bjcsc for your lightning fast reply. I visited the site and found the formula


Input KVA three phase : %3 X Voltage input X Input current

this is the formula but they come up with 90Kva as the answer to power but.... i don't see how they get there

as written Kva = /3 X voltage in X current in

their answer was 90 Kva when using 415 v x 125 a

so their example is

90 Kva = /3 X 415 X 125

it doesn't seem to work.

HELP!

tks
craig
__________________
Thanks Much!
Craig

1972 350sl Red/Blk 117k
1988 420sel charcoal/Blk 140k
1987 420sel gold/tan 128k
See My Cars at:http://mysite.verizon.net/res0aytj/index.html

Pound it to fit then Paint it to match!

There is only First Place and Varying degrees of last!

Old age and deceit will overcome Youth and Enthusiasm every time!

Putting the square peg in the round hole is not hard... IF you do it fast enough!

Old enough to know better but stupid enough to do it anyway!
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  #4  
Old 12-04-2003, 08:56 PM
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Join Date: Jan 2002
Location: NW Indiana LaPorte
Posts: 571
Kva

thanks tkamiya, that was exactly what i was looking for.

we are looking at a plasma cutter that we will need to step up to the 3ph 460v that it uses. i was trying to figure out what the Kva needed would be.

this was exactly what i was looking for. just a fast way to arrive at a reasonable Kva.

tks again
craig
__________________
Thanks Much!
Craig

1972 350sl Red/Blk 117k
1988 420sel charcoal/Blk 140k
1987 420sel gold/tan 128k
See My Cars at:http://mysite.verizon.net/res0aytj/index.html

Pound it to fit then Paint it to match!

There is only First Place and Varying degrees of last!

Old age and deceit will overcome Youth and Enthusiasm every time!

Putting the square peg in the round hole is not hard... IF you do it fast enough!

Old enough to know better but stupid enough to do it anyway!
Reply With Quote
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