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  2. Standby generator - Wikipedia

    en.wikipedia.org/wiki/Standby_generator

    A standby generator is a back-up electrical system that operates automatically. [1] Within seconds of a utility outage an automatic transfer switch senses the power loss, commands the generator to start and then transfers the electrical load to the generator. The standby generator begins supplying power to the circuits. [2]

  3. Black start - Wikipedia

    en.wikipedia.org/wiki/Black_start

    Black start. Toronto during the Northeast blackout of 2003, which required black-starting of generating stations. A black start is the process of restoring an electric power station, a part of an electric grid or an industrial plant, to operation without relying on the external electric power transmission network to recover from a total or ...

  4. Emergency power system - Wikipedia

    en.wikipedia.org/wiki/Emergency_power_system

    A portable emergency power generator in a shipping container. 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 ...

  5. Three-phase electric power - Wikipedia

    en.wikipedia.org/wiki/Three-phase_electric_power

    Three-phase transformer with four-wire output for 208Y/120 volt service: one wire for neutral, others for A, B and C phases. Three-phase electric power (abbreviated 3ϕ[1]) is a common type of alternating current (AC) used in electricity generation, transmission, and distribution. [2] It is a type of polyphase system employing three wires (or ...

  6. Uninterruptible power supply - Wikipedia

    en.wikipedia.org/wiki/Uninterruptible_power_supply

    Uninterruptible power supply. An uninterruptible power supply (UPS) or uninterruptible power source is a type of continual power system that provides automated backup electric power to a load when the input power source or mains power fails. A UPS differs from a traditional auxiliary / emergency power system or standby generator in that it will ...

  7. Operating reserve - Wikipedia

    en.wikipedia.org/wiki/Operating_reserve

    Operating reserve is a crucial concept for ensuring that the day-ahead planning of generators' schedule can withstand the uncertainty due to unforeseen variations in the load profile or equipment (generators, transformers, transmission links) faults. The California Independent System Operator has an operating reserve at 6% of the metered load.