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Calculation for a radial supply system

  1. Apr 11, 2017 #1
    1. The problem statement, all variables and given/known data

    Im working through my HNC with the answers but i do not know how they have come to the numbers below.





    Total load = 1.5/-60 degrees + 2.3/-18 degrees.

    =(0.75−j1.3)+(2.19−j0.71)



    2. Relevant equations.

    Not sure yet


    3. The attempt at a solution

    I understand how they have got to 0.75 and 2.19 it is MVA multiplied by the power factor.
    I have tried all calculations but i can not get to the j1.3 and the j0.71.
    Im fine with everything else. I know it will be something simple I'm missing
     

    Attached Files:

    Last edited by a moderator: Apr 11, 2017
  2. jcsd
  3. Apr 11, 2017 #2

    DrClaude

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    Staff: Mentor

    You'll have to explain what you tried.
     
  4. Apr 11, 2017 #3

    scottdave

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    Homework Helper
    Gold Member

    Last time I checked, lagging power factor means an inductive load. What do your numbers (0.75 - j1.3) represent? Ohms? Current? something else?
    What are they asking for? All I see is a diagram of the system.
     
  5. Apr 11, 2017 #4
    I see you understand how to get the MW from the MVA. You use the PF.

    To get the reactive power, Mvar, you need to use the reactive power factor, QF, where

    upload_2017-4-11_13-54-4.png
     
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