An power system is a network of electrical components deployed to supply, transfer, and use electric power. An example of a power system is the electrical grid that provides power to homes and industries within an extended area. The electrical grid can be broadly divided into the generators that supply the power, the transmission system that carries the power from the generating centers to the load centers, and the distribution system that feeds the power to nearby homes and industries.
Smaller power systems are also present in industries, hospitals, commercial buildings, and households. A single line diagram serves to illustrate this full system. The majority of these systems rely upon three-phase AC power—the standard for large-scale power transmission and distribution across the modern globe. Specialized power systems that do not always rely upon three-phase AC power are found in aeroplanes, electric rail systems, ocean liners, submarines, and vehicles.