single phase to 3 phase

[bernieseibert]

I have a single phase system that uses 320 amps and 240 volts and I rewire the circuits for 3 phase what size generator would I need and how many amps on each leg

 

[buzzlightyear]

I have a single phase system that uses 320 amps and 240 volts and I rewire the circuits for 3 phase what size generator would I need and how many amps on each leg

not if it is single phase , you would need a three phase genie ,what are you pulling power wise and not a cow neither .lol.

 

[Biff61]

So you want to rewire the installation for 3 phase supply, what voltage do you want to work at 400V LL or 415V LL, you need to take in account load balancing so its not just a case of installing a 3 phase panel board or DB and connecting the final circuits in hope.

If you can split the loads evenly across each phase then you will be looking at 107 amps per phase.
But you have to take account of the types of loads, are they linear or Non linear, do you have a lot of motors.

The generator must be able to handle any starting currents for motors etc, and if the load is constant then you have to take into account that generators are more efficient when running around 80% of full load.

And trying to ramp on a load greater than 30% at any single time does cause issues, it will definitly slow the engine or if it is greater than 40% full load could shut it down.

FYI, 3 phase 400V 107amp load, to ensure you are covered would have to be minimum 110Kva, that provides approx 158 amp per phase at full load. Take into account also derating factors for ambient temp, altitude etc.

 

[DPG]

So you want to rewire the installation for 3 phase supply, what voltage do you want to work at 400V LL or 415V LL, you need to take in account load balancing so its not just a case of installing a 3 phase panel board or DB and connecting the final circuits in hope.

If you can split the loads evenly across each phase then you will be looking at 107 amps per phase.
But you have to take account of the types of loads, are they linear or Non linear, do you have a lot of motors.

The generator must be able to handle any starting currents for motors etc, and if the load is constant then you have to take into account that generators are more efficient when running around 80% of full load.

And trying to ramp on a load greater than 30% at any single time does cause issues, it will definitly slow the engine or if it is greater than 40% full load could shut it down.

FYI, 3 phase 400V 107amp load, to ensure you are covered would have to be minimum 110Kva, that provides approx 158 amp per phase at full load. Take into account also derating factors for ambient temp, altitude etc.

Question was asked in Jan 2022 and the OP hasn't replied since.

 

[ipf]

Question was asked in Jan 2022 and the OP hasn't replied since.

I'm not surprised with buzz's answer mentioning 3 phase genie.......probably thought he meant 3 wishes?

 

[buzzlightyear]

I'm not surprised with buzz's answer mentioning 3 phase genie.......probably thought he meant 3 wishes?

He will need to rub harder for a puffs to to out of it.