Description : Being CBIP Publication No.328, this manual covers fundamental concepts, requirements for protection system, performance indices, protection of - generators and transformers, shunt reactors, busbar, FACTS, HVAC systems, etc. Also covered are basics for design of protection schemes based on IEC 61850 standard, protection of electrical systems with renewable energy resources, DC Aux supply systems, disturbance recorders, alarms and event logging which form important elements of the protection system.