Talk:Three-phase

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"Complex power" seems irrelevant to three-phase systems - why drag in single-phase air conditioners here? I'll have to try my hand at explaining this but it doesn't belong in this article anyway. We might also mention that 3 is the lowest phase order that displays power that is constant with time (though I haven't got a proof of that). --Wtshymanski 16:26, 21 Dec 2004 (UTC)

I still have a lot to write here and i will probablly virtually rewrite the peice to fit this articles style more but i feel that the main information in it fits here better than in three-phase electric power. Im still getting used to wikipedias system for typing forumulae as well so this article may take a while. Plugwash 22:52, 21 Dec 2004 (UTC)
Carry on! I was impressed at the math notation, and it looks pretty reasonable.

The description of "complex power" is just not found in my books, usually the phrase refers to "real" and "reactive" power - nothing to do with three phases. I think 2 phases also has the "constant power" property, I was incorrect.

Not sure if the title should change - "three phase" and "three phase power" might merge together in a while. --Wtshymanski 20:27, 22 Dec 2004 (UTC)

OpenOffice.org will export pictures in .PNG form - my next project is to draw delta and wye connected sources. --Wtshymanski 02:37, 26 Dec 2004 (UTC)

Nice that you have found a way to make diagrams. The title complex power isn't really right for that section but the content is important. I may comment it out until i get chance to rewrite it. Three phase power is currently a redirect to Three phase electric power which is an article on where why and how three phase is used. That article is already pushing the reccomended size limits of a wikipedia article so merging this lot with it is probabblly not a good idea. Plugwash 12:02, 26 Dec 2004 (UTC)

A better, or at least more encyclopedic, title would be Three-phase systems. --Wetman 23:02, 21 Dec 2004 (UTC)

can't say im a fan of long titles myself. Short titles are easier for people to remember and im not really convinced that adding the word systems to this title adds anything usefull Plugwash 12:03, 26 Dec 2004 (UTC)

I'm an electrical engineering student, and this is the first (and only) Wikipedia article I've read that shows caculations without getting to the fundamental issues I need to understand the material. I assume that "star connected" is a more general term for "wye connected" but I would like to see how this relates to delta connections. Particularly helpful would be some talk about the difference between line voltage and phase voltage and the difference between line current and phase current. These are the types of simple-yet-confusing issues that Wikipedia articles can explain like noone else. It would also make sense to discuss the difference between complex, real, and reactive power. If no one has any objections, I might right the complex power bit at the end of the semester. However, I'm not qualified to tackle the other issues I mentioned. I sincerely hope that one of you will write that stuff. Raeyin 21:17, 13 December 2006 (UTC)

For the non engineering person like myself might be useful to have a paragraph on why such a mechanism is used and some examples


[edit] math changes

Purpose of this edit:

  1. Avoiding setting dimensional quantities equal to 1. Instead achieve a similar simplification (removing constant factors from the math) by working in terms of a non-dimensionalized quantity, and substituting back and the end.
  2. Use VP as symbol for peak voltage instead of A, as slightly more self-explanatory.
  3. Adding a line explaining what the "star" configuration is.

— Alan✉ 21:20, 16 April 2007 (UTC)

i'd like to send out a big thankyou to whoever put this piece together. i have finished my first year of electrical engineering and we are yet to cover three phase systems, however this has definitely given me a strong head start for the upcoming year.(i particularly like the rotating phase diagram at the bottom, this is a very good visual aid.) two thumbs up & keep up the good work. —Preceding unsigned comment added by 203.49.139.142 (talk) 21:56, 4 February 2008 (UTC)

The break down of the trig functions is incorrect. The second minus sign should be a plus sign. —Preceding unsigned comment added by 64.95.214.18 (talk) 19:38, 26 March 2008 (UTC)

[edit] three phase current

how do i get input current of the three phase power supply if i dont have any power analyzer equipment? if the my supply will be delta or wye, will ther be a difference in current derivation? —Preceding unsigned comment added by 122.248.16.2 (talk) 08:19, 23 April 2008 (UTC)