i want to ask that as everybody knows that in star connection on star point is

i want to ask that as everybody knows that in star
connection on star point is called neutral. my question is
that why on that poin called neutral. what is the reason
behind it. what is the logic behind it. i heared somewhere
that on this point all phases current become zero thats
why. if this answer is right then prove why on that point
is current become zero. if this answer is not right then
tell me the right answer. post ur answer here or on my mail
address. m.ikram786@yahoo.com
m.ikram555@gmail.com.
thanks.

Question Posted / ikram shehzad

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i want to ask that as everybody knows that in star connection on star point is called neutral. my ..

Answer / kamlesh dewangan

In the three phase system all three phase current vector
sum to zero only if the system is balance (ie balance three
phase system).
_ _ _ _
I= Ir+Iy+Ib
These can be easily proved by solving following equation:
_
Ir = Im*sin(@)
_
Iy = Im*sin(@+120) Since in balance system all
phases are 120 degree apart
_
Ib = Im*sin(@+240) Since in balance system all
phases are 120 degree apart

_ _ _ _
now calculate I= Ir+Iy+Ib, it will become zero.

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