"gtslabs" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed) ups.com...
> 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 to
> 480 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?
>
I agree with the other poster. I believe your going to have to
1. get a bigger phase converter
2. change the motors to single phase
3. install a soft start, which MIGHT create more problems.
The 100 amps is about right for a the motor starting current. (6 x FLA)
Any way of unloading the compressor for start up?
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