# Convert single phase to three phase

Home Electrical Engineering Forum General Discussion Convert single phase to three phase

Viewing 8 posts - 1 through 8 (of 8 total)
• Author
Posts
• #10235
Participant

I have a 3 ph 220 volt, 15kW commerical cooker that was donated to our organization, Fabretto Children’s Foundation – http://www.fabretto.org.  The school where this needs to be installed only has 120/240 volt single phase service.

Can the cooker be rewired to accept the 1 ph 240 volt service or is it possible to use some type of phase converter.

Any assistance would be greatly appreciated.

#11441
Karen
Participant

Yes! You should be able to do it with a 3 phase converter.

#12261
s
Participant

If this cooker electricly is just an electrical heater you can try converting the cooker itself into 1 phase

It has three windings, seperate the connections between windings, and energize every winding seperately,

#12284
Spir Georges GHALI
Participant

Dear ;

First, you mentioned that the school has a Single Phase ” 120/240 V “, and that is not possible, because a Single Phase supply meanse that you have only 1 value 120V  or  240V, and you haven't both in the same time, but if you have both in the same time that means you have ” 3 Phase + Neutral “.

So, if you have a Single Phase ” 240V “, you have the possibility that Mr. Nael Samman mentioned, but if it's ” 120V ” and you have the same possibility you should use a transformer ” 120/240V ” with the necessary power. If you use 1 of these 2 cases you should be careful because after re-connecting the cooker to be supplied by 1 phase + neutral, the nominal current of the cooker will be 3 times than his initial value.

But if the cooker can't be re-connected, the school should absolutly have ” 3 phases + neutral “.

#12285
s
Participant

There is another way, if you can;t modify in internal connections

you can use a capaitor with the following arrangement

1- the connection should DELTA

2- the delta poles are A,B,C

3- L1 is connected to A, N is connected to B, the capacitor is connected to A and C

this should do the trick

Regarding the capacitor rating, frankly i don't know the calculations, maybe Mr.Spir (My mentor) can help with this.

#12290
Spir Georges GHALI
Participant

nael.samman said:

There is another way, if you can;t modify in internal connections

you can use a capaitor with the following arrangement

1- the connection should DELTA

2- the delta poles are A,B,C

3- L1 is connected to A, N is connected to B, the capacitor is connected to A and C

this should do the trick

Regarding the capacitor rating, frankly i don't know the calculations, maybe Mr.Spir (My mentor) can help with this.

Dear Mr. Nael ;

We use this solution for some small & special application ( not 15kW ) where thers's no possibility to have ” 3 phase + neutral “, noting that if there's inside a motor the torque will ne be stable.

#12319
jatin333
Participant

use Variable freq.Drive for converting 1-phase to three phase power

#12322
Spir Georges GHALI
Participant

jatin333 said:

use Variable freq.Drive for converting 1-phase to three phase power

Dear Mr. Jatin333

Your solution can be used in apseical cases, and please note the following :

– For most of manufatures of Variable Speed Drives, the maximum power of a VSD where the Input is ” Ph + N ” and the Output is ” 3 Phases ” is ” 3 kW “.

– The output of these VSD is only ” 3 Phases ” without neutral.

– The protection of the Output currents is dedicated for motors, that means the currents' values of 3 phases should be the same, so, if the power is suitable ” ≤ 3kW ” we should disable this protection as we don't know if the load has the same current of 3 phases.

– A lot of VSD Fonctions should also be disabled.

Regards.

Viewing 8 posts - 1 through 8 (of 8 total)
• You must be logged in to reply to this topic.