• Functional Characteristics of Protective Relays
• Operating Principles of Relays
• Overcurrent relays
• Instantaneous and Time Overcurrent Relays
• Definite Time and Inverse Time Characteristics
• Direct Overcurrent Relay and Directional over current relay
• Universal Torque Equation
• Performance Characteristics of Distance Relays
• Differential Relays
• Underfrequency and Over frequency Relays
• Translay scheme
• HRC fuses for relays