Answer / a. v. ramana reddy

A star connected motor takes less current compared to a
delta connected motor since the phase current is 1/sqrt3
times the line current, but torque developed by the motor is
affected, since starting current is heavy in order to reduce
the heavy inrush current we place a star delta
starter.....so tat starting current can be comparitively
small...the reason for shifting to delta connection(after
motor attains 80% of the rated speed)is the power output of
the motor wil be 3 times the output wen it is connected in
star.....it doesn;t mean tat the m/c 3 times more efficient
than star connected one..but correspondingly the power drawn
by the motor also increases.........
comments r welcome....

Answer / s.r.ramalingam

PHASE CURRENT AND PHASE VOLTAGE IS THE MAJOR DIFFERENCE...

IN STAR CONNECTION,
PHASE CURRENT IS EQUAL TO THE LINE CURRENT.
THT IS,
I LINE = I PHASE
BUT,
V LINE = ROOT 3* V PHASE

IN DELTA CONNECTION,
PHASE VOLTAGE IS EQUAL TO THE LINE VOLTAGE.
THAT IS,
V LINE = V PHASE
BUT,
I LINE = ROOT 3* I PHASE.

Answer / killer

In star connection motor is taking low current and produce
high torque and in delta connection motor is taking high
current and low torque.to start the motor from stand still
condition we requeired high torque so first motor should in
star connection and then it should have conti. with delta
connection.

Answer / joseph james

In star connected motors power consumption will be less
compared to delta connected motors.

Answer / krishna

star connected motor gives a more torque compare to delta
connected.

Answer / k.mohan kumar

In star connection motor is taking low current and produce
high torque.
In delta connection motor is taking high current and
produce low torque.
In star more power consumption.
In delta less power consumption.
In star connection phase current is equal to line current.
In delta connection phase voltage is equal to line voltage.
In star line voltage is equal to 1.732*phase voltage.
In delta line current is equal to 1.732*phase current.

Answer / lovepreet

Bt how it is possible that in star connected motor takes less current nd produce more starting torque than delta connected motor while speed is same????

Answer / arthur

Delta connection has a high starting torque which is not our interest since it comes with extremely high current. To reduce this current which only occurs during starting,we use star with relatively low current and low torque.

Answer / yasirfraz

STAR CONNECED MOTER TAKE LESS CURRENTAND GNRAT LESS
TOURQE,IN DELTA CONDETION TAKE MORE CURRENT AND DEVLOPED
MORE TOURQ.

Answer / pallav

star connected motor voltage is high then delta connected motor. then voltage is increases then current decreases. means delta connected motor speed is high as compare to star connected motor

For a 50MVA (138/69/13.8 KV) transformer, what would be the maximum demand in order not to exceed 80% of its operating capacity.

2 Answers  

while calculating the power absorbed by a resistor connected to the output of a half wave rectifier circuit should we use rms or average current? explain with reason.

1 Answers   Vedanta,

what is the difference between bus-coupler and bus-riser

2 Answers  

How Flywheel run in DG set, tell in details

1 Answers   Sambhav, TATA,

what is the disadvantages of star connected alternator?

4 Answers  

In LRS how much water PH value maintain for good operation of motor?

3 Answers  

define frequency ?

14 Answers   KPTCL,

50 electric bulbs are connected across supply of 220 volts. After one bulb is fused remaining 49 bulbs are again connected to same supply. which case will have more illumination & WHY????????

5 Answers   KJ,

Can any body tell me what is use of END OF LINE RESISTOR in fire alaram circuit?

2 Answers  

how many voltage or current enough to kill a person?

12 Answers  

what is the difference between ac ground and dc ground.. In my project iam using both ac and dc supply.. can both the grounds or the return paths be connected??

1 Answers  

please anybody help me to find out the BHEL trainee Exam previous year questions papers . if u ve pls. send it to surekhared@gmail.com

0 Answers   Bhel,