2-PH To 3-PH Converter

Can the connection system applicable to star, delta or both?

I'm not quite sure that the above line of words is even a sentence, but nonetheless, it doesn't ask whether or not star or delta or both are to be connected to a motor or some other device or transmission system.

Capacitor sizes are determined by what's needed to correct power factors. Do the math.

See http://en.wikipedia.org/wiki/Scott-T_transformer

It provides a diagram for a Scott-T transformer connection which is used to convert 3 phase to 2 phase power.

Just be forewarned; 2-phase power is extremely rare, in fact I know of only 2 places in the entire US that still have it available, Philadelphia and Buffalo. Most people confuse 1 phase power where they have 2 hot wires as being "2 phase" but it is not. it is Single Phase power. In that case, a Scott-T transformer is not going to work.

I agree! The 2 phases must have 90 degrees phase angle separation.

I am surprised that there actually still is 2 phase power being produced and used. Do you know any of the history as to why it still exists? I'm curious as to what practical value there can be to maintaining such a power source.

Even DC has been totally eliminated in New York City (only recently though). The persistance of DC in NYC was understandable since all the elevators were DC.

There are still a few areas where 2-phase is used with a "reverse" Scott-T to supply 3 phase without needing the wire for a 3rd phase. It's mainly used where the load is mainly single phase, but there may be a small 3-phase customer near the end of a long feeder. Many REA's use it to save on the amount of wire they have to hang where the customers are mainly single phase and very widely separated.

I have a control house at the entrance to a hydro canal which requires 3-phase to operate the gates. The only other customers for 2-3 miles are small farms, using single phase. We brought out 2 phases of a 3 phase lateral (electrically 120º apart) out and installed a 3-phase bank in Scott T configuration. It wouldn't work for a heavy or continuous load, but the gates might only run for 5 minutes once a week, and are a small part of the overall feeder load. It's worked without any problems for nearly 20 years.