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

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

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

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
:) :) :)