Answer / deshmukhgs

to avoid burning of the motor because of high curent

Answer / mohsin jamil

because motors start slowly with high torque and bcz of high
torque it needs high amp until it reaches to its full speed..
thats why we use Star connection or start the motor slow so
that motors winding doesn't burn

Answer / muthu kumaran

initially there is no back emf in motor and so current due to the supply voltage flows fully thru the motor.
for EX:230v supply resistance of motor is 0.15ohm -->I=230/0.15=1350.but the rated I is 45A.so that the motot gets damage.so we need to use the starter

Answer / tharan

reduceing for starting current....

Answer / brd ganesh

At the starting time 'EB=0'(back emf) so that
motor draws a 2 to 3 times of its full load current
and which cause to damege the winding. ummm....
That is why using stater to reduse starting current

Answer / simpson

when the motor is in off position the starting winding’s
resistance is 0 ohm .If in this condition 3 Phase 440 v is
directly applied on it the result will b blow of the starting
winding .Hence huge amount of heat will produce .

HOw can we calculate power factor at HT side.

6 Answers  

what is the differance between normal bybass & maintenance bybass in UPS?

1 Answers  

can u describe the method used for protection of transmission line.

0 Answers   IBM,

how to select the cable size? any formula to calculate cable size?

4 Answers  

Why we are designed only 11Kv and 6.6Kv Alternators, not 33Kv Alternators and Power Transmission side we are designed only 220kv, 120kv, 66kv, 33kv, 11kv, and 440volts, not 20kv, 50kv, 100kv.

2 Answers  

what is gridrotor resistance starter

0 Answers  

How can we explain that what is the power factor?

5 Answers  

the typical output of a solar cell is........

0 Answers  

What are the symptoms of a bad PG card of a drive (inverter) esp. of Yaskawa Ac Drives (inverters) G7 ?

0 Answers  

why grid failure happens?

1 Answers  

I have installed capacitor bank at secondary transformer. cos phi is increase. but on load (far from transormer), it still poor. Can anybody explain it??

6 Answers  

what is the meaning of servo motor. In trains, what type of the motors we are using at the bottom of each compartment

5 Answers