Three phase autotransformer
Three phase autotransformer
(OP)
What problems can arise if I use a three phase autotransformer with a center tapped delta power source? Sinse each phase is 240 Volts, I am told the one tapped phase will cause my autotransformer or its' load to short out.






RE: Three phase autotransformer
RE: Three phase autotransformer
My sources can be three phase 60 Hz.Y or delta at 208V, 240V, 480V, & 575V(Canada). I assume that I won't be able to use corner grounded 240V delta.
My load will be a three phase Y connected refrigeration compressor operating at 440 V 60 Hz. (European design)
The autotransformer has all of the above taps for the input voltages and for the 440 V output. It also has a non-grounded neutral.
I plan to tap one of the 440 V phases to develope, via another single phase autotransformer, 230 V for control boards and ventilating fans.
RE: Three phase autotransformer
Suggest obtaining a commercial 480∆-240∆ dry-type transformer reverse fed with taps adjusted for lower ratio.
RE: Three phase autotransformer
From: pragmatist
It looks like you are recommending an isolated transformer to get around the different kinds of three phase systems; grounded and ungrounded, that might be found in the US. Is this correct?
RE: Three phase autotransformer
The primary voltages are just a matter of correct taps.
The range of transformer primary voltages is suitable for an autotransformer. It will be smaller than a regular two winding transformer. There is a chance to save some money on shipping.
RE: Three phase autotransformer