RMS, AND 1.732 FOR 3 PHASE

[denison]

I was wondering if anyone knew why with single phase, we use the constant .707, which is the reciprocal of the square root of 2. And for 3 phase we use the constant 1.732, which is the square root of 3, but not the reciprocal value. I am not a student, btw, doing homework. I've just forgotten. Is 1.732, not the RMS? Or, some other value. I've looked a lot, and cannot find exactly what that number represents.

 

[Skogsgurra]

There is no connection whatsoever between those two numbers.

The 1/sqrt(2) is to calculate RMS fom sine peak.

The sqrt(3) is relation between V(L-L) and V(L-N).

If you can't find that anywhere, then you can't have been looking very well. It is in all basic text-books. And your teacher must have mentioned it several times.

Gunnar Englund

http://www.gke.org

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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...

 

[logbook]

http://www.du.edu/~jcalvert/tech/threeph.htm

This linked article says it is not hard to understand three-phase if you use a phasor diagram, and then they give one