Answer / sriram sarma

Starter is used for a motor to limit the high starting
current. During starting of a dc motor high current of upto
4-5 times the full load current occurs which is avoided by
use of high resistance slowly cut out of the circuit.

Answer / deepesh k v

Starter are basically used to reduce the starting current.
I = ( V - Eb ) / R.
Where I is the field winding current,
V the voltage and Eb - Back up emf and R the winding resistance.
During starting Eb = 0, and R - a very small resistance.
so, as the high current passes through the winding, there is
chance for winding to burn out. When the motor attains the
normal speed it generate the back up emf, enough to reduce
the winding current.
To avoid this we need to reduce the voltage(V) or increase
the winding resistance. Since the reduction of supply
voltage is difficult to attain, a starter is used, which
will push high resistance during starting and gradually
reduces and fully removed from the circuit when the motor
attains the full speed.

Answer / siva

starter used to reduce the starting current of the motor.
and to safe the motor winding in the high starting
current.different type of starter used to the motor. i.e, 3
point starter,4 point starter used to d.c and a.c motors.

Answer / sabyasachi kanungo

generally the resistance of armature is very small i.e in
term of .05ohm or like this.this is due to reduce the
losses.if the motor is connected direct supply high current
will flow and it may burn the armature winding.thats why
starter is connected between supply and motor which reduces
the starting current and provided smooth operation

Answer / saravanan

it is used to reduce the starting current while starting
the motor

Answer / rakesh kumar behera

Electrical starters are generally used to limit the sarting current of the inputed voltage to any d.c. motor. when voltage supply is given to a d.c. motor the current is so high that it can burn the armature windings. So to avoid this dammage we generally use a starter. 4-point starters are used to control the starting current of a d.c. compound motor.

Answer / anup maheswari

starter is used for a motor because at the time of starting
the armature current flow is very high .So,in order to
minimise the flow of high current,starteris used which is
connected in series with the resistance.

Answer / dimpal

intially motor starting current is very high. its 4-to 5
times of the rated current value. its higher value of the
cuarrent burs the winding of the motor so reduce the
startig current value we put the starter.starter function
is intially high resistance in the circuit so current its
reduceand we provide the protection.

Answer / phani chavali

consider a 3phase induction motor,it is a selfstarting
device.Eventhough it is a selfstarting one we are connecting
this device to starter because if we can not connect this
motor to stator because of sudden flow of currents in the
rotor windings some damage may takes place to the machine.so
we can start up the motor with starter means we can limit
the currents to certain value upto which the rotor gets
accelerated.When ever rotor attained its rated speed then
there is no problem of current flow.

Answer / ram

Starter is used for a motor to limit the high starting
current. During starting of a ac motor high current of upto
4-5 times the full load current.and then start/stop switch
on the motor

when we switch on the switch and load is not connected at home,is electricity wasted?

1 Answers  

In 1000KVA Transformer why does we connect HT with delta connection and LT with star connection.Illustrate by showing formula?

4 Answers   Tata Motors,

In a ordinary plug can we hold the earth in hane and connect the circuit to supply?will we get a shock?

5 Answers  

Why indicate only 440V to 3-phase supply.

4 Answers  

I have 440v power coming to facility,( not being used ) can I buy large generator, (gas) to sell power back to electrical co.

0 Answers   KVF,

Define active and passive network?

0 Answers  

How can calculate the rating of a alternator for a given specific load with formula

0 Answers   NRSC National Remote Sensing Centre,

IN MY INDUSTRIES 125 HP MOTOR USED FOR THAT ONLOAD AMPS UP TO 280 SO CAN I USE ONE LOWER KVA DG SET WITH STEP UP TRANSFORMERS THAT MEANS WITH LOW POWER INPUT TO GET CONSTANT HIGH POWER OUTPUT EG:125KVA DG SET = 250 KVA STEP UP TRANSFORMERS

1 Answers  

when transformer oil should be filtered/tested?

3 Answers  

What are dcs and plc?

0 Answers  

what do you mean by power factor ? in new view

3 Answers   BDL,

why trip circuit supervision is taking through breaker contact? what happen if takendirectly?

2 Answers   GE,