1. EE 445 Course Presentation Power System Protection
Mohammed AL-Zeer
224026

2. Outline Introduction Power System Power System Protection Relays
Conclusion

3. Introduction
How much it will cost to build a substation?

4. Introduction
How much it will cost to construct 1 km of T.L ?

5. Introduction
How much it will cost to buy a large generator?

6. Introduction
25%

7. Power System

8. Power system Protection
Transducer
Circuit breakers
Protective relays

9. Transducer sensor & transformer Current transformer (CT) &
Potential transformer (PT)

10. Circuit Breakers Mechanical device
Energize & interrupt electric circuits

11. Protective Relays Receive signals from transducers &
Control circuit breakers

12. Protection Systems
Main protection
Backup Protection

13. Zones of Protection

14. Requirements of Protection Systems
Speed
Selectivity
Reliability
Sensitivity

15. Types of Protective Relays
Over-current Relays
Differential Relays
Percentage-Differential Relays
Directional Relays

16. Over-current Relays

17. Types of Protective Relays
Over-current Relays
Differential Relays
Percentage-Differential Relays
Directional Relays

18. Differential Relays

19. Types of Protective Relays
Over-current Relays
Differential Relays
Percentage-Differential Relays
Directional Relays

20. Types of Protective Relays
Over-current Relays
Differential Relays
Percentage-Differential Relays
Directional Relays

21. Application

22. Conclusion

23. References Electromechanical Energy Devices And Power Systems (EE 360)
Power System Relaying (EE 466)

24. Thank You

25. Q & A