What is a liquid resistance starter?where it is used??




Answer Posted / anurag pattanayak

Since in a Slip Ring Induction Motor, the Rotor resistance is low, this can cause very high current and low starting torque.SO by externally adding resistance , we increase the rotor resistance and thus decrease the starting current and increase the starting torque. ie Pull out torque can be achieved at very low RPM.
An LRSS is nothing but a solution of Caustic Soda. which is connected in series with rotor.
On starting, the LRSS resistance is added to rotor resistance ( LRSS In condition)
...as slowly motor starts to gain speed ..the LRSS contacts move, there by reducing the resistance between its contacts and thus the effective resistances decreases.

When the motor has gained full speed, LRSS is cut out by usually using a shorting contactor.
thus a slip ring induction motor runs a cage motor at full speed.

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