Induction motor problem

Discussion in 'Homework Help' started by Rahul.Goyal, Jun 20, 2009.

  1. Rahul.Goyal

    Thread Starter New Member

    Aug 19, 2008
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    Two induction motors are connected in parallel and take the following loads from an a.c.supply:2kW at a power factor of 0.8 lagging, 5kW at a power factor of 0.6 lagging.Calculate the true power,the reactive power,the apparent power and the power factor.
     
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Where is your try?
     
  3. Rahul.Goyal

    Thread Starter New Member

    Aug 19, 2008
    4
    0
    sir .. someone has aksed me ..he has no idea about that question ..plz guide mik3 sir..
     
  4. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    The total true power (P) is the sum of the two motors true powers.

    The total reactive power (Q) is the sum of the two motors reactive powers.

    The apparent power is not the sum of the two apparent powers. Use this formula:

    S=sqrt[(P^2)+(Q^2)]

    PF=cos{arctan(total Q/total P)}
     
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