single phase to three phase 1

i have a controller for an electrical furnace that is rated at 24.75 kw 220 volts 112.5 amps single phase.

my question is what will be the amps if we make it to three phase.

thank you.

yama

 

[wbd]

I'm not sure I understand what you're trying to do.
If the furnance is already 3 phase, why isn't the controller?

Anyhow, if the 24.75kW is per phase power, then for a 3 phase system, assuming a voltage of 480, amps are going to be 51A.
If 24.75 kW is 3 phase power, then amps will be 17 per phase at 480 V.

wbd

 

[dydt]

hi yama...

a 24.75KW resistive load single phase is a "burden" to a power system..and your are right it should be re-configured to a three phase..

my suggestion...

disconnect the heater bank and reconnect them as a delta connected three phase balance load. you will still have a total of 24.75KW heating power... this time your line current will be 65 amps at 220v, 3-phase supply (24.75x1000/(220x1.732))..and your phase current will be 65/1.732 or37.5 amps..

overall you will save money on wire size and disconnect and also makes your power system more stable..

if you have a 480V or 600v power supply...you are better off changing the heaters...and still save money on wire size..and disconnects...experience dictates that the price of the heaters of different voltages doesn't vary much...and most manufacturers gives a lifetime warranty on it..

good luck
dydt