21.1 Protective Relays
21.2 Fundamental Requirements of Protective Relaying
21.3 Basic Relays
21.4 Electromagnetic Attraction Relays
21.5 Induction Relays
21.6 Relay Timing
21.7 Important Terms
21.8 Time/P.S.M. Curve
21.9 Calculation of Relay Operating Time
21.10 Functional Relay Types
21.11 Induction Type Over-current Relay (non-directional)
21.12 Induction Type Directional Power Relay
21.13 Induction Type Directional Overcurrent Relay
21.14 Distance or Impedance Relays
21.15 Definite – Distance Type Impedance Relay
21.16 Time – Distance Impedance Relay
21.17 Differential Relays
21.18 Current Differential Relay
21.19 Voltage Balance Differential Relay
21.20 Translay System
21.21 Types of Protection
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