Three-phase or single-phase output for UPS?

[simone]

Hello, everybody.

I've got many single-phase loads, which make about 10 kVA together. Assuming that the UPS input is three-phase, I wonder which is the better choice for the output: single-phase or three-phase?

Thanks in advance for your help

[admin]

I will encourage you to use a three phase, it is much better.

[admin]

but 3 phase is so complicated………..

[simone]

What do you think are the pros and cons of each option?

I would really appreciate a technical discussion about this issue.

 

Thanks

[Chris2011]

I think 3 phase is better.

[Alen Matanovic]

Three phase will offer some harmonics cancelation of your nonlinear loads (I assume that there are mostly nonlinear loads, since you need UPS),, but you'll still have problems with “simetry” of your loads.. It actually really depends on type of your loads..

[simone]

Alen,

 

You're right. Most of the loads are nonlinear: mainly PCs and some other electronic devices. I don't think there is any problem with “simetry” of the loads if there is a correct planification of the distribution among the three phases, before starting the installation. The fact is that I'm trying to find out if there is any strong argument which makes one option really better than the other one, but so far there isn't.

[Author]

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