Principles of Symmetrical Components Part 1c

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Principles of symmetrical components, part 1C.

Okay, in part 1C, we're going to answer this question. What is the difference ABC system versus ACB systems? Okay, and we're not going to take too much time in this video tutorial. If you already know the answer to this, you can skip to the next part.

In part 1B, we drew these three phasors and we said, "Well, by inspection, these three phasors are a balanced set." If we assign this IA, IB, IC, then by inspection, if they're all rotating counterclockwise direction, this right here is an ABC system.

Okay, I've made a carbon copy of this and put it here. We also said that if we swap IB with IC, then this effectively makes it an ACB system. The difference between ABC and ACB is simply how these phasors relate to one another.

For an ACB system, if we have this stationary mark here, then A is going to cross the stationary mark first, then C, then B. But for an ABC, A is goanna cross it, then B is going to cross it, then C is going to cross it.

It turns out that the analysis of symmetrical components heavily depends on whether or not your system is an ABC system or if it's an ACB system. Everything changes if you go from one system to another system.

In subsequent tutorials, like in part two and part three, pay very close attention to the phase sequence of the phasors that are presented and then the direction in which it's rotating, whether it's rotating in a counterclockwise direction or if it's rotating in a clockwise direction.

Understanding these two principles is critical for the analysis of symmetrical components. This concludes part 1C.

Now, if you haven't subscribed already, just click on that button on the bottom right corner of the screen. In part 1D,

we're going to review the difference between the balanced set of three phasors versus the unbalanced set of three phasors and tell you the terminologies that are involved between the two.


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