EE 445Course Presentation

Power System Protection

Mohammed AL-Zeer224026

Outline• Introduction • Power System• Power System Protection• Relays• Conclusion

Introduction• How much it will cost to build a

substation?

Introduction

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

Introduction

• How much it will cost to buy a large generator?

Introduction

25%

Power System

Power system Protection

• Transducer• Circuit breakers• Protective relays

Transducer

• sensor & transformer• Current transformer (CT) & Potential transformer (PT)

Circuit Breakers

• Mechanical device• Energize & interrupt electric

circuits

Protective Relays

• Receive signals from transducers &

Control circuit breakers

Protection Systems

• Main protection• Backup Protection

Zones of Protection

Requirements of Protection Systems

• Speed• Selectivity• Reliability• Sensitivity

Types of Protective Relays

• Over-current Relays• Differential Relays• Percentage-Differential Relays• Directional Relays

Over-current Relays

Types of Protective Relays

• Over-current Relays

• Differential Relays• Percentage-Differential Relays• Directional Relays

Differential Relays

Types of Protective Relays

• Over-current Relays• Differential Relays

• Percentage-Differential Relays• Directional Relays

Types of Protective Relays

• Over-current Relays• Differential Relays• Percentage-Differential Relays

• Directional Relays

Application

Conclusion

References

• Electromechanical Energy Devices And Power Systems (EE 360)

• Power System Relaying (EE 466)

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