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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.
Skip Adkins
Yes! You should be able to do it with a 3 phase converter.
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,
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 “.
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.
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.
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.
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