Induction Cup Structure Relays

 Induction Cup Structure Relays

The induction cup structure relay works on similar principle of an induction disc relay.

This relay can be four pole or eight pole depending on the number of windings
accommodated. 

Due to the replacement of the disc with an aluminum cup, the inertia of the rotating system is significantly reduced. 

In this type of relay, the rotating magnetic field is produced by one pair of poles inducing a current in the aluminum cup.

In this relay, the cup movement or torque is produced by the interaction of fields produced by the two pair of poles (as shown in the below figure) that have lagged one another with some angle. 

In the normal operating conditions, the cup remains standstill, but, in case of any fault, a very high current in the coil causes to move the cup so that the circuit gets isolated from the power supply.




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