Transformer size required

ronball

Member
Location
Champaign Il.
Occupation
Electric Contractor
I have a customer wanting to know how much power for their Bitcoin mining business.
they had 430 rigs that each use 3.5kw/ph at 240/415 volts.

I think I came up with transfomer being about 6000 amps.
Does this sound about right?
 

tortuga

Code Historian
Location
Oregon
Occupation
Electrical Design
Assuming you can balance all the 240V L-N loads
I would take the nameplate VA of the units total them up add a 25% continuous factor then divide by 720.51V (416 * 1.732 V)

Side note I call our new standard voltage '416/240' should I be calling it 415/240?
 

tortuga

Code Historian
Location
Oregon
Occupation
Electrical Design
If they really are 3500VA per unit I come up with 2089 Amps:
Qty​
VA​
VA total​
Amps​
430​
3500​
1505000​
2089​

Assuming you can balance the load on all three phases.
I wonder what the lead time on a 2000 kVA padmount 416/240 transformer is?
EDIT: I did not add the continuous factor
 
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