Modern day power systems are complicated networks with number of generating stations and load centers being interconnected through power transmission lines

Modern day power systems are complicated networks with number of generating stations and load centers being interconnected through power transmission lines. An electric power system has three separate components – power generation, power transmission and power distribution. Electric power is generated by synchronous alternators that are usually driven by either steam or hydro turbines. Depending on the type of fuel used for the generation of electric power, the generating stations are categorized as thermal, hydro, nuclear etc. Many of these generating stations are remotely located. Hence the electric power generated at any such station has to be transmitted over a long distance to load centers that are usually cities or towns