# Three phase system

1. Feb 7, 2010

### noobie!

1. The problem statement, all variables and given/known data
consider the balanced three phase star source with RMS phase voltage magnitude of 230V shown in fig5 with an impedance of Zg=5+j5.The per-phase impedance value of a three phase balanced star and delta connected loads are 30+j30.
a)Determine the line and phase voltages and currents at the star and delta connected loads

2. Relevant equations

don't have any,sorry~
3. The attempt at a solution
i totally got no idea where to begin with,can someone please guide me??thanks~

2. Feb 7, 2010

### xcvxcvvc

From my standpoint, it looks like you know nothing about three phase power since you've shown no work. It's a little hard to write out a whole chapters worth of theory on three phase power to prepare you for this problem.

To do this problem, I would convert the delta load to a Y load, and use a per phase analysis.
http://img697.imageshack.us/img697/4961/42710974.jpg [Broken]

Last edited by a moderator: May 4, 2017