Answer / ranjit kumar mallick

In induction motor the rotor movement is due to it's
interaction with the stator resultant rotating magnetic
field flux and the resultant magnetic flux is due to the
three phase closed circuit. Once we ground the star point
the resultant magnetic field will drop and it becomes
extremely dangerous in case of fault as motor will run at
low speed without triping due to the current path available
to ground.So it will draw high current

Answer / sarwar

Star point of motor is not necessary to ground because a
motor is a balanced load.So,no current will flow through
star point to nutral.

Answer / vishwanath chothe

Grounding a motor star point will create an earth path for earth leakage current to flow through that motor's star point. If there are 10 motors in a process plant and their star points are all grounded, there are 10 additional paths for earth leakage currents to flow through.
If all the motors' star points are grounded in this way the earth fault current detections by the protection relays will be complicated and likely they will trip at the incorrect locations because earth fault currents are flowing in many directions toward multiple grounded neutral points.

Therefore the electrical consumers (ie the load, including the capacitor banks), even if they are star connected, are not to be grounded.

Answer / nadeem

Bcoz star point make additinal loop to source volatge and leads to burst the motor...

Answer / suresh

if unbalance current in motor then motoe burnt due to the
y point earthed

Answer / raju_

STAR CONNECTED WINDING IS CLOSE LOOP CIRCUIT IT SELF IF
YOU TRY TO GROUNDED THEN CRIRCUIT NOT GOING CLOSE THEN
MOTER WINDING IS NOT GENRETED E M F AND MOTER
CANT'PERFORMING WELL! THATS WHY WE CANT GROUNDED THE STAR
CONNECTED WINDING.

Answer / rsjendran

The star point of the motor can not be earthed since fault
currents from other systems may enter in to the motor
circuit ....

but normally motors are not protected againest this...

since it is advisable to ground the star point of the motor

thanks

Answer / sai

In the internal winding of the terminals shorted as a
nutral is Act to as earth.

is the secondary voltage of current transformer greater than primary voltage,,,,,,,,] give the example with ct burden,current ratio,and primary and secondary side voltage?

2 Answers  

why generator is star connected ?

3 Answers   Voltech,

i have old tape recorder speakers(analog).nw i want to use it for my computer system.can i use it to my computer systeno m by using digital to analog converter??? what changes should i do in the system????

0 Answers  

How to decide CT & PT ratings for a given transmission line carrying some rated voltage?

0 Answers  

can any one help me out by posting something related to rvnl interview for site engineer electrical.? what is the procedure? what kinda question they ask us? how long the interview goes? and any tips? and any thing you want to share?

0 Answers  

you are a electrical student, why are you coming for software job.

4 Answers   TCS,

HOW TO CALCULATE THE CABLE SIZE FOR POWER CABLE, CONTROL CABLE AND INSTRUMENT CABLE

1 Answers   TurboTech,

What is the drawback of static coefficients?

0 Answers  

Define resonant frequency?

0 Answers  

Good morning: I'm looking for some informations about the OLTC or the LTC: I wont to know what the function of the tie-resistor in during the operation of reversing/coarse operation Cordially

0 Answers   CMERI,

I would like to install the largest KW alternator to a 200 amp aluminum bus box in my home. Is it possible to install a 250 KW 400v 251amp synchronous alternator to my home?

2 Answers  

when two gen set runing in parallel but thay have diffrent pole pitch, then what will be happan

0 Answers