Star connected unbalanced load - help with a calculation

Discussion in 'Homework Help' started by ElecNerd, Jan 23, 2011.

  1. ElecNerd

    Thread Starter New Member

    Jan 2, 2011
    Star connected unbalanced load - help with a calculation
    Hi I am trying to calculate the phase currents in a star connected un-balanced load.

    The phase voltage is 100V and the resistance in the yellow phase is 50Ω

    The formula I have is...

    100 ∠ -120°

    I am struggling with how to input this into a calculator and how to get the amps in numerical value for the yellow phase.

    All help greatly appreciated - ElecNerd
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    Your formula will be correct as long as the star point is tied to the neutral conductor and the voltage phase angle is -120° for "yellow" phase convention.

    As to entering the numbers using your calculator - you will need to study the user manual on how to do complex number operations.

    The calculation you have doesn't really require a calculator. The answer would be 2A @ -120°.