Symmetrical Components: Intuitive Understanding
Symmetrical Components: Intuitive Understanding
(OP)
I have quite a bit of literature on symmetrical components including the Blackburn book on symmetrical components in power systems, but I'm having some trouble fully understanding the topic beyond the equations to find the sequence quantities.
With a single line to ground fault, all networks are connected in series. I'm having trouble visualizing this. I understand that positive sequence current flows from the generator to the fault point. At the fault point, I would assume that zero sequence current flows from the fault point back to the generator through the ground return path. How is negative sequence current involved? What is the source of this?
If you have any good papers on symmetrical components, a link will be appreciated.
With a single line to ground fault, all networks are connected in series. I'm having trouble visualizing this. I understand that positive sequence current flows from the generator to the fault point. At the fault point, I would assume that zero sequence current flows from the fault point back to the generator through the ground return path. How is negative sequence current involved? What is the source of this?
If you have any good papers on symmetrical components, a link will be appreciated.






RE: Symmetrical Components: Intuitive Understanding
RE: Symmetrical Components: Intuitive Understanding
RE: Symmetrical Components: Intuitive Understanding
I think it's important to have an intuitive feel for symmetrical components. I wrote this article that attempts to provide an overview of symmetrical component: http://gpac.link/175IP7B
I'm planning to write symmetrical component analysis for different types of faults - but who knows how long that will take me.
As for visualizing symmetrical components, check out this simulation: http://personal.strath.ac.uk/steven.m.blair/seq/ - it's very helpful
http://GeneralPAC.com - Awesome video tutorials for power systems PAC!
The Wye Wye Transformer Connection video: http://gpac.link/1GdGRSQ
RE: Symmetrical Components: Intuitive Understanding
RE: Symmetrical Components: Intuitive Understanding
xnuke
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RE: Symmetrical Components: Intuitive Understanding
Don't get me wrong, I'd have a hell of time doing what I do if it weren't for dear Mr. Fortesque, but it's all just a mathematical construct. Useful, work simplifying, but not measurable in real life. A modern relay can calculate the sequence components and perform highly useful things with them, but you can't make the intuitive connection between phase domain currents and sequence domain currents that the OP desires.
RE: Symmetrical Components: Intuitive Understanding
https://www.youtube.com/watch?v=oYj7j5QBlY0
Nothing to do with this but Gilbert Strangs math lectures are great. https://www.youtube.com/watch?v=oYj7j5QBlY0
RE: Symmetrical Components: Intuitive Understanding
RE: Symmetrical Components: Intuitive Understanding
RE: Symmetrical Components: Intuitive Understanding
His interactive symmetrical component demo of the rotating positive, negative and zero sequence vectors combining to equal the unbalanced phase & neutarl currents helps visulaizing the concept. It allows you to adjust the per unit value of each symmetrical component and see the effect.
(I don't have time to find and post the link).