Single Phase to 3 Phase Conversion
Single Phase to 3 Phase Conversion
(OP)
Hi folks, I came across a question of having two single phase transformers used to develop a three phase output. I thought they are going to use 2 - 2-winding transformers and connect them in Vee-vee arrangement. It came out that they are planning to use two 230VAC single phase VARIACs. I am aware that these single phase VARIAcs are actually auto-transformers (with input + common). They are planning to connect the "output common" of VARIAC 1 to the line output of VARIAC 2 (like a Vee-vee connection). I think this will not work out since it would develop unacceptable voltage unbalance which would draw high current on one of the phases and it might fry up the VARIACs as well.
Given the situation, is there any possible connections that I am not aware of?
Given the situation, is there any possible connections that I am not aware of?






RE: Single Phase to 3 Phase Conversion
RE: Single Phase to 3 Phase Conversion
RE: Single Phase to 3 Phase Conversion
If it is for a small motor, a VFD can be used. Or a small M-G set.
RE: Single Phase to 3 Phase Conversion
Usually these things rely on a capacitor to derive the out-of-phase third leg, and usually the capacitor needs to drive an inductive load (a motor). Usually the driven motor must be significantly derataed.
"Unacceptable voltage imbalance" is subjective. How bad can it be but still be good enough?
"Might fry up the VARIACS": depends on the rating of the VARIACs.
We'd need some more detail on your circuit to be more specific in the response.
RE: Single Phase to 3 Phase Conversion
RE: Single Phase to 3 Phase Conversion
http://unique3phase.com/
RE: Single Phase to 3 Phase Conversion
Keith Cress
kcress - http://www.flaminsystems.com
RE: Single Phase to 3 Phase Conversion