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emergency power system
An emergency power system is an independent source of electrical power that supports important electrical systems on loss of normal power supply. A standby power system may include a standby generator, batteries and other apparatus. Emergency power systems are installed to protect life and property from the consequences of loss of primary electric power supply.
They find uses in a wide variety of settings from homes to hospitals, scientific laboratories, data centers,〔(Fuel cell in the data center Munich )〕 telecommunication〔(India orders 10.000 fuel cell emergency power systems )〕 equipment and ships. Emergency power systems can rely on generators, deep cycle batteries, flywheel energy storage or hydrogen fuel cells.〔(Fuel Cells in Backup Power Applications )〕〔(DOE Fuel Cells for Backup Power )〕
==History==
Emergency power systems were used as early as World War II on naval ships. In combat, a ship may lose the function of its boilers, which power the steam turbines for the ship's generator. In such a case, one or more diesel engines are used to drive back-up generators. Early transfer switches relied on manual operation; two switches would be placed horizontally, in line and the "on" position facing each other. a rod is placed in between. In order to operate the switch one source must be turned off, the rod moved to the other side and the other source turned on.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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