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Question
Explain principle of Soft-starter & how its working???
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
Mainly Induction Motor takes 5-6 times of FLC while starting
in DOL mode.So soft starter is used to start the motor for
reducing starting current and smooth starting.Softstarter
which gives the voltage from 30% to 100% percentage of
voltage by certain time(Its in seconds) to the motor.By
means of thyristor softstarter is controlling the
voltage.After 100% voltage reached,the inbuilt DOL bypass
contactor is come into picture.
Advantages of softstarter:Motor life be good,Mechanical
equip life be good.
Disadvantage:It is mainly not applicable for heavy starting
load,Harmonics
 
Is This Answer Correct ?    25 Yes 2 No
Boopathiraj.s
 
Answer
# 2
Softstarter is used for good starting tourch with lesser
starting current
 
Is This Answer Correct ?    24 Yes 4 No
Prashant
 
 
 
Answer
# 3
in this starter we using mainly 2 contrctor. 
Is This Answer Correct ?    36 Yes 20 No
Vipupk
 
Answer
# 4
Soft starter is a device which controls satarting Current
of the motor. it start the motor from 0 to 100% slowly.
meanwhile it save the electrical power and reduce the loses
and starting tarque.
 
Is This Answer Correct ?    21 Yes 5 No
Muhammad Ashraf
 
Answer
# 5
soft starter also use to prevent the motor heats up & loss
of wear & tear of friction losses.
Also soft starter use to prevent the loss of power.
 
Is This Answer Correct ?    19 Yes 13 No
Sushilkumar
 
Answer
# 6
In soft staretr current is gradually increased which is
save the power loss & also the motor friction in
unnecessarily used.
 
Is This Answer Correct ?    21 Yes 16 No
Sushil
 
Answer
# 7
Soft starter is a device which controls satarting Current
of the motor. it start the motor from 0 to 100% slowly.
meanwhile it save the electrical power and reduce the loses
and starting tarque.
 
Is This Answer Correct ?    8 Yes 3 No
M.a.bhatti
 
Answer
# 8
for starting a rated motor with a DOL starter which draws 5-
6 times of load current initially which causes voltage
drops in line while a soft starter takes comparatively less
current and gradually decrease to the rated current.
but the main draw back of soft starter is its torque
remains low at the starting.
 
Is This Answer Correct ?    3 Yes 0 No
Esveekayzee
 
Answer
# 9
motor life time is increased
reduces mechanical stress on motor
power is saved
 
Is This Answer Correct ?    6 Yes 8 No
Asif Khan
 
Answer
# 10
soft stater working in 2 contectter in use by stating
current in soft stater load in full rpm in dol contecter
 
Is This Answer Correct ?    16 Yes 25 No
Vipul
 

 
 
 
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