Answer / nbsubrahmanyam

In 3phase ac system ,In the case of link in neutral, we
should not use fuse.
(neutral is using at distribution level for getting single
phase or 3 phase 3wire 4wire system to supply the power to
the some loads),
Suppose we use the fuse in the neutral line,if any fault
or break occur in the neutral line, but current flows from
phase/line to load and come to neutral wire where it has
break,there will be a chance to shock to human
beings/workers who will do the works regarding the repairs.
we generally putting fuse in phase/line for protecting
the equipment/device from high voltages/currents.if any
fault occur in the phase/line ,current will not flows from
fuse,only it will come fuse hence there is no problem. but
in the case of neutral, the current flows through out
equipment that may lead to creat some problms as mentioned
above.

that's why we w should put only link for neutral in three
phase ac system.

Answer / mohamed mustafa

The role of link in 3 ph system is to give path for the
unbalanced currents. Instead of using link if you use fuse
think what will happen when the fuse blows in the neutral
line.

Answer / hussein

some of the answers are correct but one of the major
reasons why the neutral should be there is to protect the
system in case of any partial system failure. If one of the
phases fails then the other 2 [hases will not get affected
if the neutral is hooked up but if is not there then the
voltage across the other 2 phases will change dramatically
and might damage the load or will not be sufficient to
carry those loads.

Answer / kevin fowke

The role of the link in a three phase system is to allow
complete safety isolation of the system for maintenance
purposes. When a 3 phase 4 wire system is used to supply
single phase loads between phases and neutral
disconnecting the neutral could cause a single phase load
to be subject to the same voltage as the phase to phase
voltage. Normally all 3 phases should be completely
disconnected BEFORE the neutral is disconnected. For this
reason a fuse is never placed in the neutral line of a
3phase 4-wire system. In a single phase system the
disconnection of the neutral before the phase line is not
that important.

Answer / shal

Neutral is use for complete the circuit and also for return path.In three phase motor,neutral its desnot use,but house holders and industrial ,if they use three phase,need neutral because light and fan such equipment work in single phase and neutral use for return path

Answer / aby

frnd will u pls explain me why there is no nuetral lines in power transmission systems? and also tell me whats the potentiol of top tranmission line in a tower????

Answer / m akmal

yes i m agree with u mr mustaf but pl tell me what happan
if any star conection can not be grounded or ground wire
brocken

Answer / victorvgp

so, neutral link is just a link to neutral and why we
doesn't connect a wire instead of link.

Answer / pinky

question: My 3 phase system was blown. When connecting to
a piece of equipment there was small explosion and neutral
pin melted on the connector that carried 3 phase power to
piece of equipment. What happened??

Answer / vamshikulkarni

ohh my dear friends be simple.... In industries we use both
balanced(motors) and unbalanced(lighting type etc.) loads..
So we need to make unbalalnced loads into balanced.. so to
make this we use neutral..
And coming to the need of grounding the neutral at
transformer is "to divert third harmonics to ground and not
letting them to go to loads"

tell me some type of questions throught which i can prepare for exam and do my best

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