Answer / thowsif

In Star System Line Current = Phase Current



In Delta System Line Current = Root 3 Times the Phase
Current.

It Only a Line Current not the Phase Current.

Answer / sudheer

line current means the current flowing through the AC
supply lines.phase current means current flowing through
each phases like R or Y or B phases.relation between line &
phae currents are

star connected system: phase current =linecurrent
delta connected system: phase current ={ linecurrent/√3}

for balanced 3Ф 4W system current flowing through the
neutral will be sum of phase currentsand will equal to zero.
ie Ir+Iy+Ib =0 =In

Answer / subrata sur

In clamp meter we get line current because phase current is
only inside the alternator.

Now for star load,
line current = phase current = clamp meter reading

and for delta load,
line current = clamp meter reading
phase current = clamp meter reading / 0.732

Answer / sumit dhar

Lets say we are using transformer,

A delta star transformer, the 3 phases coming out of the
star side of the transformer are the red, yellow and blue
wires abbreviated as R Y and B. The Current flowing through
these wires is the Line current. Using a Clamp meter, we
should clamp the meter to one of the wires say R phase. The
measured value will b Line current passing through R phase.
If the load is Balanced load, then equal amount of current
will flow through the Phases R Y and B respectively. After
that we can measure the Phase current using the formula
given above.

Answer / santosh patel

Line current= 1.732xPhase current

Answer / vivek

I WOULD LIKE TO CLARIFY THE DOUBTS OF MR ANANDHARAJ'S
COMMENTS IN ANSWER 8.. HE FAILED TO UNDERSTAND THE BASICS
OF ELECTRICITY THAT CURRENT ALWAYS FLOW IN A CLOSED LOOP SO
THERE IS NO QUESTION OF OPENING THE LOOP ...AND MOREOVER
WHEN USING CLAMP METER, YOU DONT NEED TO OPEN A CIRCUIT...
SO WHAT I MEANT BY "OPENING" IN ANSWER NO 2 WAS OPENING THE
ENCLOSURE OF THE SOURCE OR THE LOAD IN ORDER TO ACCESS THE
JUNCTION... I HOPE NOW MR ANANDHARAJ WOULD BE IN A BETTER
POSITION TO APPLY HIS RICH EXPERIENCE AND GUIDE A NOVICE
LIKE ME TO GAIN SOME PRACTICAL KNOWLEDGE.. THANKS FOR YOUR
INTEREST.

Answer / dayanidhi nayak

for star- Iph=IL
delta= Iph = IL/1.733

Answer / nirav_patel2120

The current flowing in each line is called line current.&
Current in each winding is likewise known as phase current.

In star load
line current=Phase Current.
In Delta load
line current=√3 Phase current.

Answer / vivek

i am glad that subrata sur has answered in a very practical
manner.... we all have read this in books but what i wanted
was a answer from somebody who has a field experience...
good answer...

Answer / anandharaj

Hello friend vivek( answer 2 ) If u r open the load or the
sourse , how current will flow in open circuit?. which
current u ill measure?.

What are thermo couple cables and where they are used.

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generally in LT and MV motors we are using 3.5Coresx16,25,35,50 etc cable for supply.although motors is earthed at two point and having all protection.then why we are using that 1/2 core for earthing the motors.while in HT cable we are using only 3core cable for motor supply.generally lt and mv motors are delta connected and ht motors having star connection.whethere it is having any relation with winding connection( star or delta).all motors i am talking about are dol only.can anybody solve my confusion.thanks...

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