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why we use transmiter and reciver in the Exciter gentrator , and how earth fault happen...

why we use transmiter and reciver in the Exciter gentrator , and how earth fault happen in genrator ?

Engineering   Electrical-Engineering   
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Field ground detection is provided without slip rings by means of a transmitter mounted on the diode wheel assembly. because A light signal is sent across an airgap to a stationary receiver and relay to indicate presence of a ground.

The Rotor Protection relay is used in synchronous motors and generators to identify the presence of an earth fault in the rotor winding. While the winding in the rotor is insulated from the ground during normal operation, the Rotor is subjected to stresses due to vibration, heat, etc. These stresses can cause the winding to give way in a particular place and the winding can get earthed.

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