If a motor of 8.5 KW with same load and using in both Star
& Delta one by one,then which will take more current in
star connected or in delta connected
Answers were Sorted based on User's Feedback
Answer / subash nishad
take line voltage is VL and Zs is the impedence of
each phase,
then in case of delta connection ,VP=VL
phase current I(delta)= VL/Zs
we know that in delta connection ,
Line current IL= root 3 times phase
current
so line current I(delta)=root3*VL/Zs
in case of star connection,Vp= VL/root3
phase current I(star)= VL/root3*Zs
weknow that in star connection,
phase current=line current
IL(star)=VL/root3*Zs
so, IL(delta)/IL(star)= root3*VL VL
---------- / ----------
Zs root3*Zs
= root3 *VL root3*Zs
--------- * ----------
Zs VL
= 3
IL(delta) =3*IL(star)
hence, delta connection will take 3 times more current
than star connection..
Is This Answer Correct ? | 9 Yes | 0 No |
IF motor is started using a delta starter then VP=VL (
Phase voltage is equall to line voltage & Load current Isc
is become root3.Isc.
Now if this motor is connected in star then then VP=VL/root3
& IP= isc /roor3
It clearly shoow that in star connection motor take 1/3
times less current then starting in Delta.
Is This Answer Correct ? | 5 Yes | 2 No |
Answer / pillay
What is important is, the motor is designed to operate at
what connection and what voltage.IF it is designed for the
other connection and you powewr it the other way you will
destroy the motor winding or you wont get the intended
power out put.
power is always line voltage X LINE CURRENT x PF x root 3
for 3 phase motor, and you cannot change it.
Is This Answer Correct ? | 0 Yes | 2 No |
Answer / benchalli.nagaraj
in STAR the current is more,
Because of
In star: line current = Phase current
In delta: line current =/root 3 phase current
Is This Answer Correct ? | 1 Yes | 9 No |
what is the principle of motor
Which material is used for the core of a transformer and why?
What is emperical relation.Name few of them which are used in electriacl engineering?
what is the difference between earthing and unearth
please give me all the Alarm .Trip ,Safety Relays & Conditions of Diesel-generators mail me on ashokbabunhce@gmail.com
How the electric train gets the supply of electricity? What is the return path of the current?
What does OHB stand for in specifications for circuit breakers, especially found in SF6 circuit breaker?
what is residuel magnetism. and how order lead acid batteries for 24 volt. emergency lighting system.
what is the function of fire alarm system?
can anybody give me current carrying capacity of cables e.g size of cable in sq.mm & its current capacity both alluminum & for copper
Electromagnetic torque developed by the motor is compared to shaft torque. A less B same C depends on motor design D more
In a 3Ph induction motor(old) 6 wires came out from terminal & not mentioned u1,v1,w1,u2,v2 & w2. how can find out the terminals? how can connect to star delta starter??