neutral current

needtoknow; is the neutral warm/hot to touch? are you reading harmonics? perry

perry;;;it is littel bit warm???is it risky ???

It is risky if the current exceeds the neutral conductor's carrying capacity. Is the neutral the same cross-sectional area as the other conductors?

pwslack

yes it is,the neutral cable cross section is the same as the three Ph's which is 4c*95mm2,and as i know this cross section can carry up to 270-280 A,so in order to avoid any problem i would decrease the load,,i thought that the un balance between the three Ph's doesn't mean this much less,,cause i think when we say un balance ;means more than -+(50)A between the 3Ph's

Is there a single phase generator connected to one of the three phases downstream of the measurement location?

pwslack;;no..there is no single phase generator connected to any phase...but i am getting the power to my 3 phase load from this 3 ph generator as usuall,and i am using a digital ammeter to cheack each phase current,but the neutral still higher than the 3 ph's .

In case any of the three phase load is a motor, it wouldn't have survived. In any other of the various typical 3 phase circuits also the single phasing is ruled out - (two phases connected at source).

Did you check up the voltage - phase-phase and phase to neutral? This would have given an insight to what is happening.

It definitely implies presence of Triplen Harmonics in your system. Do undertake a Harmonic Study.

Oee have to doubt over the harmonics.......may be you have many nonlinear loads,switching devices n all..........

Multiple earthing also cause circulating current ,if your system has multiple neutral grounding

Check the voltage between phases. If you happen to have two of the phases connected together at the source you would get neutral reading as you are showing.