Delta motor sum

Discussion in 'Homework Help' started by Amit mahajan, Sep 23, 2010.

  1. Amit mahajan

    Thread Starter New Member

    Sep 23, 2010
    1
    0
    a 440 v,60 Hz, 4Kw,delta motor draws a phase current of 3.96A at full load, 0.9 lag.Draw a fully labelled circuit diagram and calculate
    A] the total power supplied.
    B] efficiency.



    please someone help with this....
     
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    The total power draw is

    P=√3*V_line*I_line*pf

    Where:

    V_line is the line-to-line voltage
    I_line is the line current - presumably this is the same as the phase current in your question. I say presumably because if the stated current is the delta winding current, then the results will be 'curious'.
    pf is the power factor

    As there are no losses stated then one must assume the efficiency calculation is to be based on the motor rating of 4kW.
     
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