Answer Posted / sabaris
Normally motor takes current at the time of starting is three times of full load current.at this starting time there is no presence of back e.m.f. to compensate this effect of current.so,this much current will affect the motor windings results overheating... due to this we use starters to reduce the starting current at the time of starting..In running say 80% of its speed the back e.m.f. will generated.on that time the full vge is applied to the motor terminals to run its rated speed.
there are many starters are available depends upon the type the motor construction... i.e. star-delta,rotor resistance,autotransformer,2 point and 3 point starters,etc....
| Is This Answer Correct ? | 10 Yes | 3 No |
Post New Answer View All Answers
Why front mounted CT polarities are always towards breaker?
What is the end effect of linear induction motor ??
when the Transmission and Distribution network where is the "feeder" lines are located? and why should be used in T&D network.....
what do u understand about FACTS? how they are useful?
Explain the following and how these are working with PLC Unit 1 I/O Module Card 2 Adaptor Card 3 Ribbon Adaptor 4 I/O bus 5 I/O Devices
how to build a network which step down 415v to 1v rms
Why can't we parallel Voltage transformer secondary circuits?
how to discharge 3 phase power factor correction capacitors
why current is constant on d.c?
what types of electrical & mechanical test conducted in switchyard?
why various test are performed on electrical panels & power cables before commissioning on site & what are these test???
HOW TO CALCULATE S/C,O/C,E/F OF ACB.
1.what is meaning of curve into a mcb. 2.what is basic reason changing of curve
distribution is maximum done by a)radial b)network c) parallel d)b & c
What are the reasons for the parallel operation of transformers?
