Re: Should "sine" or "cosine" function be used to represent currents in a 3-ph system
Looking where the sine fundamental crosses zero: Notice a similar slope in its harmonics.
This is not the case with the cosine. The 7th harmonic runs crosswise where the fundamental crosses zero.
Picture if you were to apply positive DC to an idle system. During the initial moment, I think all harmonics would start going in the same direction, namely positive.
So it seems to me you should go with the sine function rather than cosine.