Transformers

1. You cannot convert single phase into three phase by operating transformers in parallel. Transformers are operated in parallel just like synchronous generators for load sharing.

However, you can convert a three phase supply to a two phase supply and vice versa by using Scott-T connection for a transformer. A rotary phase converter is used to convert single phase to three phase.

I suppose you must have asked this question by confusing it with connection of three single phase transformer bank for a three phase transformer.

2. You cannot increase the power using a transformer. A transformer is used to change the voltage level (except isolation transformer). The VA rating of the transformer remains the same during this process. A step-up transformer increases the voltage level and step-down transformer does the opposite. The load demand (power) is always met by a generator but not a transformer.

3. Ohm's law is applicable for all linear devices which includes transformers also.

Should be noted that a Scott-Tee transformer is for transforming 3 phase to true 2-phase power, as defined by the phase relationships being 180 degrees as opposed to 120 degrees. This is an anomaly that only exists in some very old areas of the US.

The term "two phase" in IEC parlance is referring to 2-out-of-3 phases, what we call "single phase" in the US. A Scott-tee transformer will NOT convert 2-out-of-3 phase power to 3 phase power.

1. Accurate phase relationship and power consumption.

2. Freshman physics; xpower=xpower.

3. Yes.

4. Why can't you do your own homework?