Recent content by BjornFanden

Thank you for your time :)

Thank you for replying. But I am just curious when the Author of the book (Power Quality by C. Sankaran) says that by shifting one load 30 degree with respect to the other, we can cancel out the 5th and 7th harmonic, assuming the loads are equal etc. But we can not cancel them completely...

Hi, I do not see how this method (illustrated in the figure below), can completely remove the 5th and 7th harmonic? I know that in a wye-delta connection a 30 degree phase shift is introduced. But to fully remove the 5th harmonic we need a phase shift of 180/5 = 36, and for the 7th harmonic we...

Yes, that helps, thank you for your time. @cabraham and @jim hardy , one last follow up question: If we have a wye-wye transformer where only 1 side is grounded, this means no zero sequence current can flow in the transformer, correct? What would happen if this transformer were supposed to...

EDIT 2: Did you mean: I_CA = I_AB = (+) I_BC = 1.0 at angle 0 deg I_A = (-) I_CA - I_AB = (1.0 + j0) - (1.0 + j0) = 0 (Symbols in parentheses are what you wrote in your post.) Or did I missunderstood something?

Both of you, thanks. Nah, it was nice reading.EDIT: Case 1: Let's say we have a delta-delta transformer supplying an unbalanced load, then currents will circulate in the windings in such a way that the sum of the 3 line currents equal zero? Case 2: If we now have a wye-delta transformer...

Thanks, informative post. But I'm not sure why the 3rd harmonic is short circuited in the delta winding, why does it circulate instead of flowing out of the delta winding? I think if i understand this question, i am in a position to understand most of the post you linked.

Dear PF members. I have trouble understanding how zero sequence currents circulate in a delta winding. For example zero sequence currents such as 3rd harmonics, they will circulate in the delta winding and get trapped, why? Why can they not go further? I have recently started to study...