In 1885 George Westinghouse, an American entrepreneur, obtained the patent rights to the Gaulard Gibbs transformer and imported a number of them along with a Siemens generator and set his engineers to experimenting with them in the hopes of improving them for use in a commercial power system.
Using this knowledge he built the first practical transformer based alternating current power system at Great Barrington, Massachusetts in 1886.6 Westinghouse would begin installing multi-voltage AC transformer systems in competition with the Edison company later that year.
During this time the rivalry between Thomas Edison and George Westinghouse's companies had grown into propaganda campaign over which form of transmission (direct or alternating current) was superior, a searies of events known as the "War of Currents".
In 1891, Westinghouse installed the first major power system that was designed to drive a 100 horsepower (75 kW) synchronous electric motor, not just provide electric lighting, at Telluride, Colorado.On the other side of the Atlantic, Mikhail Dolivo-Dobrovolsky built a 20 kV 176 km three-phase transmission line from Lauffen am Neckar to Frankfurt am Main for the Electrical Engineering Exhibition in Frankfurt. In the US the AC/DC competition came to the end when Edison General Electric was taken over by their chief AC rival, the Thomson-Houston Electric Company, forming General Electric.
HVDC had previously been achieved by series-connected direct current generators and motors (the Thury system) although this suffered from serious reliability issues.In 1957 Siemens demonstrated the first solid-state rectifier, but it was not until the early 1970s that solid-state devices became the standard in HVDC. In recent times, many important developments have come from extending innovations in the ICT field to the power engineering field. For example, the development of computers meant load flow studies could be run more efficiently allowing for much better planning of power systems.
Advances in information technology and telecommunication also allowed for remote control of a power system's switchgear and generators. Źródło: https://en.wikipedia.org/wiki/Electric_power_system#History
Customers themselves, usually using the touch panel choose certain options standstill.After driving into the parking traveled with him it is possible only upon payment of the appropriate fees and scanned the ticket.
Parking systems are designed so that the most common problems that may arise during their lifetime the irregularities in the electricity and then the appropriate repair must address electrician.