IN THIS APPLICATION HAS THE FOLLOWING TOPICS 1. PROTECTION - protective schemes (i)core balanced protective schemes. (ii) merz-price protective schemes. (iii) pilot (iv) pilot-less. - types of relay systems (i) permanent magnet moving coil. (i) balanced beam (ii) induction type carrying relay (iv) the distance relay (v)non-directional relay (vi)solid state relay. -types of unit protection (i)generator protection (ii) transformer protection (iii) feeder protection - non-unit protection (i)