Discrimination Protection-electrical


  • Discrimination Protective discrimination is when the protection systems of a distribution system act to disconnect only the faulty component and leave the rest of the system operational. 
  • This is achieved by arranging the current settings and the time ratings of the various protective devices. 
  • The protective devices nearest the load will need a lower current rating and a faster operating time than the protective devices at the generator.


 Protection devices 

1. Fuses.
2. Circuit breakers.
 3. Contactors.
 4. Overcurrent relays.
 5. Under voltage relays.
 6. Reverse power relays.