Mains electricity or utility power, power grid, domestic power, and wall power, or in some parts of Canada as hydro, is a general-purpose alternating-current (AC) electric power supply. It is the form of electrical power that is delivered to homes and businesses through the electric grid in many parts of the world. People use this electricity to power everyday items—such as domestic appliances, televisions and lamps—by plugging them into a wall outlet.
Electric power distribution is the final stage in the delivery of electric power; it carries electricity from the transmission system to individual consumers. Distribution substations connect to the transmission system and lower the transmission voltage to medium voltage ranging between 2 kV and 35 kV with the use of transformers. Primary distribution lines carry this medium voltage power to distribution transformers located near the customer's premises. Distribution transformers again lower the voltage to the utilization voltage used by lighting, industrial equipment and household appliances. Often several customers are supplied from one transformer through secondary distribution lines. Commercial and residential customers are connected to the secondary distribution lines through service drops. Customers demanding a much larger amount of power may be connected directly to the primary distribution level or the subtransmission level.
A DC connector is an electrical connector for supplying direct current (DC) power.
The utility frequency, (power) line frequency or mains frequency is the nominal frequency of the oscillations of alternating current (AC) in a wide area synchronous grid transmitted from a power station to the end-user. In large parts of the world this is 50 Hz, although in the Americas and parts of Asia it is typically 60 Hz. Current usage by country or region is given in the list of mains electricity by country.
An HVDC converter station is a specialised type of substation which forms the terminal equipment for a high-voltage direct current (HVDC) transmission line. It converts direct current to alternating current or the reverse. In addition to the converter, the station usually contains:
A distribution transformer or service transformer is a transformer that provides the final voltage transformation in the electric power distribution system, stepping down the voltage used in the distribution lines to the level used by the customer. The invention of a practical efficient transformer made AC power distribution feasible; a system using distribution transformers was demonstrated as early as 1882.
Railway electrification systems using alternating current (AC) at 15 kilovolts (kV) and 16.7 hertz (Hz) are used on transport railways in Germany, Austria, Switzerland, Sweden, and Norway. The high voltage enables high power transmission with the lower frequency reducing the losses of the traction motors that were available at the beginning of the 20th century. Railway electrification in late 20th century tends to use 25 kV, 50 Hz AC systems which has become the preferred standard for new railway electrifications but extensions of the existing 15 kV networks are not completely unlikely. In particular, the Gotthard Base Tunnel still uses 15 kV, 16.7 Hz electrification.
In rail transport, head-end power (HEP), also known as electric train supply (ETS), is the electrical power distribution system on a passenger train. The power source, usually a locomotive at the front or 'head' of a train, provides the electricity used for heating, lighting, electrical and other 'hotel' needs. The maritime equivalent is hotel electric power. A successful attempt by the London, Brighton and South Coast Railway in October 1881 to light the passenger cars on the London to Brighton route heralded the beginning of using electricity to light trains in the world.
A voltage converter is an electric power converter which changes the voltage of an electrical power source. It may be combined with other components to create a power supply.
An engine–generator is the combination of an electrical generator and an engine mounted together to form a single piece of equipment. This combination is also called an engine–generator set or a gen-set. In many contexts, the engine is taken for granted and the combined unit is simply called a generator. An engine–generator may be a fixed installation, part of a vehicle, or made small enough to be portable.
The Siemens Energy Sector was one of the four sectors of German industrial conglomerate Siemens. Founded on January 1, 2009, it generated and delivered power from numerous sources including the extraction, conversion and transport of oil and natural gas in addition to renewable and alternative energy sources. As of October 1, 2014, the sector level has been eliminated, including the Siemens Energy Sector.
Coolkeeragh power station is a power station near Derry in Northern Ireland.
The balance of system (BOS) encompasses all components of a photovoltaic system other than the photovoltaic panels. This includes wiring, switches, a mounting system, one or many solar inverters, a battery bank and battery charger.
EmPower is a brand name that refers to three different power outlets available on commercial airlines:
Zaporozhtransformator (ZTR) is a Private Joint Stock Company, formerly - Zaporozhye Transformer Plant: a company specializing in the design and manufacturing of oil-filled power transformers, shunt reactors and magnetically controlled shunt reactors, with production facilities located in Zaporizhzhia, Ukraine.
Končar – Power Plant and Electric Traction Engineering Inc. is a Croatian company with headquarters in Zagreb. Končar - KET is 100% owned by Končar – Electrical Industry Inc.. It is the KONČAR Group's leading sales and marketing company that also manages all engineering activities within the Group. The main business activity of Končar – KET is designing and construction of complex facilities intended for generation, transmission and distribution of power, transport and industry at "turn-key" principle.
The Kyiv Pumped-Storage Power Plant is a pumped-storage power station on the west bank of the Kyiv Reservoir in Vyshhorod, Ukraine. The Kyiv Reservoir serves as the lower reservoir and the upper reservoir is located 70 m (230 ft) above the lower. Water sent from the upper reservoir generates electricity with three 33.3 megawatts (44,700 hp) conventional hydroelectric generators and three 45 megawatts (60,000 hp) reversible pump-generators. During periods of low demand, such as night time, the pump-generators push water from the lower reservoir to the upper for use during peak hours. The first generator was commissioned in 1970, the last in 1972.
The Taean Machine Complex is machinery factory in Taean-dong, Taean-guyŏk, Namp'o Special City, North Korea producing a wide array of electric machinery for industrial and household use.
The FS Class E.470 was an electric locomotive class of the state-owned Italian railway Ferrovie dello Stato. It was used on the Italian three-phase test line from Rome-Sulmona especially in express train service. After the end of the trial operation in 1945, the locomotives were scrapped, and no locomotive of the class has been preserved.
