How many acceptable output power deviation between phases for Smart VT?

[BillP]

Pls, I'm wondering about devide ouput load of Smart VT UPS.
I don't know, How many acceptable output power deviation between phases for Smart VT?
Thank you very much!

[Erasmus_apc]

Are you inquiring about the deviation in voltage between phases? The Smart-UPS VTs have very strict voltage tolerances for differences between phases...it should be < .5 volts between each N-G measurement. Or, are you asking for the total output voltage distortion? The total output voltage distortion is < 5%, when at full load. Please clarify your question if these don't answer it.

[BillP]

Hi Erasmus,

Are you inquiring about the deviation in voltage between phases?

I need to know the deviation in output power (W) between phases (load balancing).
Thank you for your support!

[Erasmus_apc · Accepted solution]

Hi,

The W load between each phase for a VT system needs to be as balanced as possible to achieve "unity" power factor and minimize any current return across a neutral line. You could technically have no current along any one phase on the system but you run a high risk of current returning back through the neutral, if present. The unit itself does not create any deviation in output through it's double conversion process...so the phase balancing aspect would be up to the user.