What is the difference.....

170

01:19:07

Hey EC, i'm currently taking an electrical machinary course, and a got upto this point and this idea cannot getout of my head, "What is the advantage of connecting transformers in delta or star configuration if we still can transform each phase independently using 3 single phase transformers with out connecting them in any way" like in the post the right one is Y-Y connection and the left one is my question..

published 10 years ago

hurz

10 years ago

Higher voltage -> more power! The voltage is between two phases √3 higher than a single phase.

selman

10 years ago

Thanks for the quick responce, but what do you mean by "higher" power....

hurz

10 years ago

In your circuit a single phase is 20Vpeak. Delta voltage of 2 lines is 20V*√3=34.6V! This will give you a 3times higher power by same load resistance, cuz voltage increase √3 and current increase √3

selman

10 years ago

Ok.... Got it, thanks...... And another thing, do you have any idea why 173A current is flowing in 120° and 240° phases ????

hurz

10 years ago

Yes, its because of DC op calculation at startup. The generator phase offset cause an voltage at an almost pure inductor, only 100mOhm resistance. This give a high DC current which will slowly disappear. To avoid that you must slowly startup the generator voltage or put a cap in series which is not so nice, because its not your circuit from lab.

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