calculation for unbalance load

Discussion in 'Homework Help' started by AlAA_Eng, Apr 9, 2007.

  1. AlAA_Eng

    Thread Starter New Member

    Apr 9, 2007
    2
    0
    hi

    if i have the load readings for R,Y,B,N phases

    ex: R=209 , Y=158, B=130, N= 209
    how i could calculate the percentage of unblance??

    also hoe to calculate the voltages for Rn,RY,RB???

    please help me :(
     
  2. recca02

    Senior Member

    Apr 2, 2007
    1,211
    0
    plz post your attempt at the question, without which the purpose of forum is defeated. also can you attach the circuit diagram because its not quite clear to
    me.
     
  3. AlAA_Eng

    Thread Starter New Member

    Apr 9, 2007
    2
    0
    Thanx

    actually there is no circuits!!
    these are all information i have pluse DT capacity is= 315 kVA
    oh yah N= 52 Amps not 209

    is there any way to calculate the Rn,RY,Rb?
     
  4. JoeJester

    AAC Fanatic!

    Apr 26, 2005
    3,373
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  5. recca02

    Senior Member

    Apr 2, 2007
    1,211
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    well, i dont remember solving unbalanced load question, but somewhere i read
    that power for each phase remains constant so may be 3.5/3 kva per phase, i m not sure if it applies to unbalanced situation so please check if that is the case. if it is then voltage calculation becomes easy .will get back to you if i get a some clue.
    for solving problems based on unbalanced load the method of symmetrical components is used. (i myself m working on it now thanks to you :) ).
     
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