I have been fighting high amp problems with a compressor 10 hp motor running at 240V 3 phase. I am getting 100+Amps using my clamp-on meter during the initial start before it blows my 50 amp breaker. I am considering bumping up the voltage after my 15 hp phase converter to480 using a transformer. As I understand it the KVA = KV * A * 1.73 for a 3 phase transformer. So a 30 KVA transformer should yield 36Amps at 480V. If I use this as the secondary I need 240 72 amp input for the primary.
I assume I would need a tranformer to handle BOTH motors even though one is before and one after it? So 25Hp = 22.4 amps? And 30KVA =30,000/746 = 40 HP bigger than my combined motors. Am I sizing this 30 KVA transformer correctly or do I need to add in other factors and need a bigger transformer?