over current

1.  PROTECTIVE RELAYS:
1. electromechanical relays.
2. static relays (semiconductor).
3. digital relays.
electromechanical protective relays:
1- The plunger type
2- The clapper type
3- The electromagnetic induction disc

8. 1- The plunger type

12. 2- The clapper type

18. The electromagnetic induction disc

20. 3
-
‫التغذية‬ ‫مصدر‬ ‫قوة‬
:
-
Strong sourse

21.  Weak source

40.  Over Current Protection
(Instantaneous Over Current Relay)

41.  Tripping Characteristics of Multi-Stage Definite
Time Over Current Relay

42. 
‫عيوبه‬
:

44.  Definite Time Over Current Relay with Internal
Timer