in induction motor the torque is propotional to squre of
supply voltage in case of dol the motor directly connected
to supply so torque is more while in star delta the motor
is firstly connected to star hence voltage is reduced
torque will be less and when motor reaches its 80% of speed
it connects with delta with the help of timer then full
voltage is supplied hence less rating motor should be
started with dol but for high rating it should be with star
Please Help Members By Posting Answers For Below Questions
IN MY SYSTEM THERE IS ONLY OVER CURRENT EARTH FAULT RELAY
IS AVAILABLE. FOR THE UNBALANCE SENSING IS THERE ANY RELAY
IS AVAILABLE? THE SAME CTs WHICH ARE USED FOR THE OVER
CURRENT EARTH FAULT RELAY CAN USE FOR UNBALANCE ALSO?
what is quality factor in series resonance circuit and
calculate the factor of voltage magnification? how it happens?
what is the difference between normal motor and flame proof
As we know induction squirrel cage motor torque Directly
praprortinal to applied voltage in star connection & delta
also. If I connect 55KW Motor to DOL starter in load
condition does motor withstand the load & what will be the
current withdrawn ? motor will not fail ?
Starting times for soft starter & power factor is thier any standard or datas available in manufactures list. Kindly suggest.
what is capacitor voltage transformer??
how it is different from potential transformer?
HAI SENT HPCL APTITUDE QUESTION PAPER, MY EMAIL ID IS
What will be result if we connect LT votage to the terminal
of HT motor?
What is the role of a Production Engg in a Industry?????
what material is used in capaciter
what is the difference between RMS & TRUE RMS VOLTAGE
I HAVE A 50A MCCB AS PER DESIGN LINE WIRE CONNECT UPWORD
SIDE AND LOAD IS CONNECTED TO DOWNWARD SIDE TO THE MCCB.IF
NOW ANY ONE CHANGE SUPPLY & LOAD(WISEVERSA) WHAT HAPPENS ?
DOES MCCB OPERATION OR WORKING FUNCTION NORMAL IF YES THAN
WHY THERE ARE MARKED LINE & LOAD ON MCCB.
1.what is difference between ATS & STS main use.
2.what is difference between ACB& VCB With symobles,and
main partes, manimum range.
3.How many types of relays and main function.
What is the instrument to check the rotating diode fuse of
alternator in running conditions?
what is difference between the buscoupler and bus raiser?