Answer / pratheesh

In three phase system, if the loads on all three phases are
equal, there will not be any current flow through neutral.
Remember the star point of motor. I1+I2+I3=0. If there is
no potantial in neutral with respect to ground, there will
not be any current flow.
But if the loads on any phase/s are not equal to others,
I1+I2+I3 is not equal to 0. So in this case there will be
some potential on neutral wire at the load side and this
will creat a current flow to the star point of trasformer.

Answer / jawad

NEUTRAL CARRY RETURN BUT NOT POTENTIAL,ALL WHAT WE GET
SHOCKED IS BECAUSE OF POTENTIAL.AND IN ANY CIRCUIT YOU WILL
SEE THAT ALL POTENTIAL HAS BEEN ALREADY DROPPED IN THE
COMPONENTS.SO AT NEUTRAL WE HAVE ZERO POTENTIAL

Answer / satyavir

Neutral carry return current equal to phase current but in
the scence of one phase.OR it carry in three phase
condition only when different current flowing conditon if
current will same in three phase then in neutral wire no
current return.

Answer / pavan

here neutrling is nothing but ground so for ground
potential is zero so current is zero

please tell me when we start motor without load in star or delta connection whose current above condition,pl write formula

0 Answers   Foxconn,

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Energy metering: On the property I am renting, the supply voltage is 2 x 110 volts. These 2 x phases enter a energy meter which then exit the meter to over head lines to my house. Question 1. The meter is single phase 240 volts but is being used as 2 x phase(2 x 110volt), is this acceptable? if not, please give me the reasons. The meter details are as follows: 60Hz 15amp Imax 100 amp Kd 3,6 Wh/R 1 fase 3 hilos Model FX 231. I think it was manufactured in Brasil From this meter, the cables run along over head aluminum conductors,I estimate the cross sectional area to be 25mm diameter, but the neutral is only about 10mm square diameter, which cover a distance of 170 meters and then terminate with an underground cable of 65 meter length, total length = 235 meters. There must be a huge voltage drop over this length. This line is protected with 2 x 200 amp aluminum fuses after the meter, there is no main switch in the distribution board. These 2 phases connect directly onto 2 busbars. Surely the neutral should be the same size as the conductors if not more? Question2. What are your thoughts about this installation, should there be better protection, is the neutral too small? During the night, the lights dim then brighten all the time, this cannot be good for my electrical appliances. In my home, I only have a small electric geyser and fridge, my stove works off gas. But when i use other appliances like the washing machine or microwave oven, the light dim. The internal wiring of this house is done with solid hard drawn copper wires and of course, they have to be under rated. I am a retired electrician by trade, but not on the metering and over head mains side, my experience is on the factory maintenance side of things. Your expertise on these matters will be greatly appreciated. Please inform me how to rectify or make any improvements Kind regards, my power bill is very expensive, so I need to know how to bring it lower. Kind regards, Brian

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