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Need help. balanced three phase

  1. Aug 9, 2012 #1
    1. The problem statement, all variables and given/known data
    A balanced three phase 866v, 60Hz Y connected source feeds a balanced delta connected load via 100km long three wire transmission line. The impedance of each wire of the transmission line is 1+j2 ohm. The three phase impedance of the load is 177-j246 ohm. If the phase sequence is positive determine:
    the line and phase currents
    the power absorbed by the load
    the power dissipated by the transmission line


    2. Relevant equations
    is the 100km important in this question?


    3. The attempt at a solution
    I have tried to figure out the resistance of each conductor, but not sure if it's relevant
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Aug 9, 2012 #2

    rude man

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    100 km isn't, but 1 + j2 is.
     
  4. Aug 10, 2012 #3
    In what way should it be used?
     
  5. Aug 10, 2012 #4

    rude man

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    In no way. All you need to know is the impedance of each line, plus the other data you're given.
     
  6. Aug 11, 2012 #5

    rude man

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    Hint: a delta load can be redrawn as a wye load; then, since you have a balanced network, you can focus on one phase only ....
     
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