Protection and Controls (P&C) engineering and design is extremely important in power grid protection and coordination especially with the use of intelligent electronic devices (IEDs). Proper P&C designs and coordination with protective relaying and IEDs is an essential part of electrical power engineering for protecting large expensive power equipment such as: generators, transformers, transmission lines (TLs), power circuit breakers, electrical bus, etc.
Many wonder exactly how the electric power grid works from generation to transmission to distribution and to the end users. There is more to electricity than simply turning on a light switch. Electric power has given us many conveniences and has improved our quality of life forever more, sometimes more than we can imagine. This provides a basic explanation of the electric power grid.