Answer / abc

in balanced condition no current flow through neutral but
in unbalanced condition current flows thru it

Answer / pratheesh

In 3 phase with neutral wire system, if the loads on all
phases are equal, there will not be any current flow in
neutral.
But if the loads on any phase/s are not equal compared to
others, there will be some current flow through neutral.

Answer / abdul wajid

Current will only flow in neutral when there is unbalanced
load otherwise in balance load no current will flow in
neutral

Answer / faizal

question is current flow in neutral rit.
so we can start from single phase. there is phase and neutral wire and we are connecting this 2 wire across any load ok.
phase wire carries in coming current and neutral wire carrries outgoing current. but when we touch neutral wire we wont get any electrical shock dats why every one have confusion. the answer is current is always flow through low resistance path. neutral wire potential is always zero and it is connected to earth in substation. so while we touching the neutral wire current has 2 path. one is through our body to earth , second one is through neutral wire . our body has some resistance. so obvoiously current wont flow through the resistance path in this case.

Answer / kapil n.bahadure

The current will flow in neutral when circuit have in
unbalanced condition in three phase system.The magnitude of
current & impedance valeu is not same then retern current
flow in neutral wire for circuit comleted.
The single phase system neutral is required for circuit
complete.when circuit comleting then current flow by
neutral wire.

Answer / srinivasa kc

The current always flow from higher potential to lower potential i.e, from phase to neutral(In a single phase circuit).as we know the T/F sec is star connected i.e, neutral wire is grounded in the T/F placing point, so all the current flows from phase through load to neutral(The return current always flows through the neutral for closing the circuit path) hence we cant feel the shock even if we touch the neutral wire because neutral is at ground potential(i.e, current always flows through the low resistance path)

Answer / ramendra shukla

In Y- connected load (3 phase)
1) If Ir= Iy=Ib then In=0 (Symetrical /balance)
2) If Ir#Iy#Ib ; then In=x (Unsymetrical/unbalanced)
where; Ir,Iy,Ib &In are phase &Neutral current
respectivelyand also #is is not equal

3)but in case of Single phase looping the avilability of
current will be.

Answer / ashish saxena

under unbalance condition of phase current will be flow
through the neutral .otherwise it will be remain zero..

Answer / deepu electrical supervisor

Yes, there will be current flow in the neutral wire based on the unbalanced condition. We used 3.5 core cables for power circuits and high gauge copper as its earth. In the case of lighting circuits we used 4 core cables cables and less gauge copper wire for its earth. Normally, the neutral point is properly grounded from the transformer neutral by means of copper plates, hence it is at zero potential. We know current flow from high potential to lower potential, so when we switch on the load there will be a tendency of current to flow from phase to neutral but the power is consumed by the load based on the ratings and its types. But at balanced load condition there will be very less current flow on the neutral wire because the load consumes full current. But when unbalanced fault occur there will be return current flow in the neutral wire to the source. In this case the circuit get tripped by circuit breakers.....

Answer / babu

yes,,current is flow from neutral when load is unbalance in
3 phase.

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1. A 380 / 220 V r.m.s. 3-phase 4-wire circuit carries loads of 8 + j8.1 ohm; 4 + j4.1 ohm; and 2 +j2.1 ohmin the three phases respectively. The length of the circuit is 100 m, and the resistivity of the phase conductors is 0.0005 Ω/m. The neutral conductor is of the same size as the phase conductors. a) Select a reference angle 0for the first phase. Then write down the three phase voltages in both polar format and complex number format. b) Make appropriate assumptions, and take temperature effects on resistance is insignificant. Calculate the currents in the three phases. (Note: Determine conductor resistance, and apply Kirchhoff’s Voltage Law) Based on the result, suggest a main switch rating for the circuit. c) Show your preferred direction of neutral current in a diagram, and then determine its value. (Note: Apply superposition principle, and Kirchhoff’s Current Law) Use its magnitude to show that in this circuit, the unbalanced load may increase the voltage drop in some of the phases. (Note: Also observe the common volt drip in neutral) State your assumptions, if there are any. d) Suddenly the neutral wire of the circuit is broken. Estimate the new currents in the first phase, i.e. Phase L1. State your assumptions, if there are any.

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