# Three-phase current

1. Jul 11, 2004

### silentcreek

Hi all,

first I have to say, that my mother tongue is not English. So I'm not very used to special English words that belong to physics. But I try to translate as well as you can understand what I mean. Therefore it would be helpful to me, if you wouldn't use any special acronyms in your answers.

My problem belongs to three-phase current.
I want to calculate the result vector of a three-pase current system, that is used unsymetric. For example the first phase has 6A (Ampere), the second one has 5A and the third one 1A. Then I want to have the amount of current that is in the "null conductor" - the result current.
So I know that this would be a simple addition of vectors, but I have trouble finding a good relation to calculate it.
I already found a relation using trogonometric functions. That solution works fine, but it is very complicated.
My result would be for this example: 4,58A

Is there any easy relation to get the result?

I hope you understand my problem.

Tanks.

Timo