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#1
12-04-2003, 12:56 PM
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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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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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#2
12-04-2003, 03:07 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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1982 Mercedes-Benz 300CD 1982 Mercedes-Benz 240D - stick
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#3
12-04-2003, 04:10 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
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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
12-04-2003, 07:56 PM
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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!
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