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

1. ### AlAA_Eng Thread Starter New Member

Apr 9, 2007
2
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hi

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???

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?

Apr 26, 2005
3,393
1,211
5. ### recca02 Senior Member

Apr 2, 2007
1,211
0
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 ).