《电力系统Electric power system》.pdfVIP

Electric power system From Wikipedia, the free encyclopedia (Redirected from Power system) A steam turbine used to provide electric power. An electric power system is a network of electrical components used to supply, transmit and use electric power. An example of an electric power system is the network that supplies a regions homes and industry with power - for sizable regions, this power system is known as the grid and can be broadly divided into the generators that supply the power, the transmission system that carries the power from the generating centres to the load centres and thedistribution system that feeds the power to nearby homes and industries. Smaller power systems are also found in industry, hospitals, commercial buildings and homes. The majority of these systems rely upon three- phase AC power - the standard for large-scale power transmission and distribution across the modern world. Specialised power systems that do not always rely upon three-phase AC power are found in aircraft, electric rail systems, ocean liners and automobiles. Contents [hide]  1 History  2 Basics of electric power  3 Balancing the grid  4 Components of power systems o 4.1 Supplies o 4.2 Loads o 4.3 Conductors o 4.4 Capacitors and reactors o 4.5 Power electronics o 4.6 Protective devices o 4.7 SCADA systems  5 Power systems in practice o 5.1 Residential power systems o 5.2 Commercial power systems  6 References  7 External links History [edit] A sketch of the Pearl Street Station In 1881 two electricians built the worlds first power system at Godalming in England. It was powered by a power station consisting of two waterwheels that produce