Basic Idea of relay protection, Nature and causes of faults, Zones of protection, Primary and back-up protection, Basic principle of operation of protective system, Methods of discrimination, Derivation of single phase quantity from three phase quantity, Components of Protection
Symmetrical & unsymmetrical faults.
3-Phase systems, Significance of positive, negative and zero sequence components, Average 3-phase power in terms of symmetrical components, sequence impedance, fault calculations, Single line to ground fault, Line to ground fault with Zf, Faults in Power systems, Concept of short circuit capacity of a Bus
Comparators and different relays.
Amplitude comparator, Phase Comparator, Coincidence type phase comparator, Basic elements of a static relay, OverCurrent Relays, Differential Protection, Static distance Protection