Answer Posted / veeresh kumar.m.

it is used for disconnecting the auxilary(starting)winding
of motor when its speed is reach 75%,that means the
auxilary winding is open in circuit when motor is in
running condition.
it is working on centrifugal force system.

why the perameters of secondary circuit are more important then that of the primary circuit of induction motor?

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Hi Suppose we have a wye/wye transformer which is grounded at both sides,in this situation, do we have ay ground transformer? in other words, ground transformer can do any thing more (while we have nuetral wire in both sides)? As the last question, what about 3rd harmonic? we have two choices: first using wye/delta transformer + ground transformer and second using wye/wye earthed connection.in the former choice, we dont have 3rd harmoonic at the secondary side but what about Yn/yn conection? do we suffer from 3rd harmonic in the Yn/yn connection?

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