I want to connect a 3 phase 480V motor to a 600V supply. Lets say for example the load of the motor is 100A at 480V.
600V - 480V = 120V is the voltage difference.Typically the rating of the transformer would be expected to be
1.73 x 120V x 100A = approx 20 KVA, and I would add a safety margin of 125% but this is a very small transformer with small lugs and a small enclosure. Am I right in assuming that this transformer would be acceptable to start and run this motor load? It seems that there are other issues that might come into play like line impedence etc. I look at the size of the wire I need to feed the motor and the size of the wires and lugs inside the transformer and there is a huge difference.Here is another hypothetical situation just to show the direction things go. Lets say I want to change a 200A load from 600V to 575V, a
25V difference.1.73 x 25V x 200A = 8.6KVA.
You would never get a 250 Kcmil cable into this box. How would I size that transformer? Just upsize it until the case and lugs are big enough? Is this an acceptable means of doing this calculation?
Thanks
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