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
how can get electrical "c" licence.i am complited in
DEEE.PASSING YEAR OF 2010 I AM WORKING IN SPENCER PLAZA
ELECTRICAL MAINTENANCE ,I AM DIPLOMA COMPLEATED IN ANDHRA
PRADESH AND WORKING OF TN PLEASE HELP ME