neutral will carry current only during unbalanced or faulty
condition.During balanced condition current through neutral
is zero(Ia+Ib+Ic=0).Magnitude of neutral current depends on
the fault current magnitude.
In case of SIngle Phase System Neutral will carry current
of same magnituge as phase current.
In case of 3 Phase, Star Connected System, neutral will
carry current only during unbalanced or Phase to Neutral
fault condition. During balanced condition current through
neutral is zero(Ia+Ib+Ic=0). In case of Unbalance load
Neutral Current can be maximum as phase current. & In case
of Phase to Neutral Fault Magnitude of neutral current will
be same as fault current. In case of Phase to Earth Fault,
neutral current will be 0. Earth current is suppose to pass
through Earthing grid or Armoure of cable.
Nuetral will carry current in unbalance & faulty / EF or SC
condition. During normal condition vector sum is Zero and
megnitude is also zero, but in faulty condition zero
sequence current will flow through neutral and megnitude
depends upon fault strenght.
As per KCL Sum Of Individual Current is Equal to Zero.
That's the Neutral Point is Zero.
In Unbalnce Condition the current will flow in neutral
point. that magnitude will Based on Faulty Current.
Balanced Condition Ia+Ib+Ic=0(N)
Unbalanced Condition Ib+Ic=-Ia(N)Faulty System only.
In normal condition there will not be any current in
Neutral, and the vector sum will be 0, If there is any
EF/SC/Unbalance occured the fault current will always pass
through the lowest resistance path in this case neutral is
the lowest resistance path so when neutral will caryy the
load the magnitude will be equal to the magnitude of fault
I have 30KW Motor Starter Panel, System voltage is 480V, So i have to convert voltage 480 to 220V to give the contactor coil. How i can select control transformer, Which rating transformer i can use this panel, what is the procedure, please tell me.