Quote from: big al on November 24, 2017, 01:22:19 AM

Quote from: judypug1956 on November 24, 2017, 12:24:36 AM

Quote from: big al on November 24, 2017, 12:12:25 AM

Is this 3 phase or single phase? Huge difference!

600 volt is 3 phase the transformers I have links for are Wye 600 to 208/120. I have more then basic knowledge but I am not an expert in this field.

I am not an engineer or electrician.

Here's how I think the math works, and I will explain each step:

600 volts RMS < ----This is ACROSS the phases, not phase to neutral

347 volts RMS <--- Phase to neutral

400 amps is 3-phase < ---- This is the most important part. You have 3 phase power but are running 1 phase units.

Using https://canadatransformers.com/transformer-phase/ to calculate KW/KVA using all 3 phases:

600v x 400 amps = 415.69 KVA

(600 x 400 x 1.732)

Calculate using a single phase:

347v x 400 amps = 138.8 KVA

Yup checks out, it's 1/3 of the 3 phase. So we have a total system KVA of 415.69. To translate to KW we need to multiply by the power factor:

415.69 KVA x 0.99 = 411.5 KW

So we have a total system KW available of 411.5, multiply by 0.8 (80%) to get available power:

411.5 * 0.8 = 329.23 KW available

Divide by 1.475 KW:

329.23 / 1.475 = 223 units

That's a lot!

Where are you located? I'm in Winnipeg. What is the size of the transformer in kva?

Edit: I did not include transformer losses since we need to knock down that 600v further.

Looking at your calculation.. you just arrived at 329V.. the PSU of the miners are rated 220V.. so you still have to step it down

Philip's calculation is correct. You have to step it down from 600V to 208/120V 3phase then distribute it to single phase circuits in able to power up that psu. That transformer is huge and heavy. We have dry type transformer here at work 480V-230V with a 400A main breaker with a size of 800mmW x 800mmL x 1000mmH housing.