avm
avm
Branch Unspecified
28 Aug 2011

Current in the neutral wire of 3 phase system

When a 3 phase system is balanced, what will be the current in the neutral wire ?
ashuashi

ashuashi

Branch Unspecified
10 years ago
Practically there is no balanced 3 phase system. Ideally in 3 phase balanced system neutral current will be "ZERO".

regards,
avm

avm

Branch Unspecified
10 years ago
I was also of your opinion. But i have seen in a book that the neutral current in a three phase balanced system is one third of the phase current. that is why i posed the question.

thank you for reply
ashuashi

ashuashi

Branch Unspecified
10 years ago
This case is for Star connection & delta connection when Line current & Phase current come into picture.

Check for phase current & Line current details. Your doubt will be resolved.
sauravgoswami

sauravgoswami

Electronic
10 years ago
first of all nuetral point is a null point,though it not an ground ,well theoritacally it should be ZERO,but practically its not possible so watever network you are considering you should try to keep it close to zero.
laxman7m

laxman7m

Branch Unspecified
10 years ago
Ideally, the current in the neutral wire is ZERO
ashuashi

ashuashi

Branch Unspecified
10 years ago
what are your views AVM. Did you find the answer to your querry?
avm

avm

Branch Unspecified
10 years ago
Thank u all who have contributed to the discussion...............................
baja

baja

Branch Unspecified
10 years ago
Neutral carries sum of three currents.
In a 3 ph system currents whose magnitude and angle are
1. I (0)
2. I (120)
3. I (240)

if we add all three we get zero..
manoj_2all

manoj_2all

Branch Unspecified
8 years ago
Neutral is the point at which all the three phase’s current meets and the algebraic sum of current becomes zero in case of “Balanced Load Condition”.

I = I1 + I2 + I3 = 0

When ALL phase has balanced load, neutral should be ZERO volt in respect to earth. Be careful the word “Balanced”, which means, if there is an unbalanced phased (due to load), the neutral will no longer be ZERO volt in respect to earth. When there is more than ZERO volt between neutral and earth, then there will be current flow through these 2 points (Leakage Current).

Even for most of the time, neutral and earth has ZERO volt between them; they should never be connected together or be used interchangeably.

Neutral: Return path of current flow in order to make a closed circuit [Return Path Conductor].

Earth: Path for Leakage current [Short Circuit / Fault Current / Crack in Insulation] in the circuit to protect Human & Equipment Safety.
QuarkToo

QuarkToo

Branch Unspecified
8 years ago
zero and there is no need for a neutral wire if it is truly balanced. The neutral wire keeps voltage spikes from occurring in an unbalanced system. It is unlikely that you will find a balanced system in the real world.
hetal prajapati

hetal prajapati

Branch Unspecified
8 years ago
nutral is only in star connection no nutral wire in delta am right?
sasuke

sasuke

Branch Unspecified
8 years ago
I [FONT=&quot]though Ineutral = I1 + I2 + I3. and not zero. should have current as neutral are return path of the phase current right? [/FONT]
saurabh2486

saurabh2486

Branch Unspecified
8 years ago
theoretically it will be 0 but practically it will show readings close to 0 as there might be some losses
prabim

prabim

Branch Unspecified
8 years ago
Why excessive neutral current dot desirable in power distribution systems?
debskolmodin

debskolmodin

Branch Unspecified
7 years ago
If 2 currents on phase A and B are 16 A and phase C is 10 A what is the current on the neutral? Thanks in advance for your help.
narayana murthy

narayana murthy

Branch Unspecified
7 years ago
debskolmodin
If 2 currents on phase A and B are 16 A and phase C is 10 A what is the current on the neutral? Thanks in advance for your help.
i think it may be 4 or 8
because difference current flows in neutral to balance
Arp

Arp

Branch Unspecified
7 years ago
do the phasor sum of current not scalar
narayana murthy

narayana murthy

Branch Unspecified
7 years ago
Arp
do the phasor sum of current not scalar
i think yes is the answer
as per my knowledge current lags voltage depending on load and each phase voltage is divided by 120 deg so current will be on same to the voltage
but it does not same for all the voltages as type of load change in phases the angle is also changes respective to the voltages
so there is some change in phase currents

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