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  2. Light switch - Wikipedia

    en.wikipedia.org/wiki/Light_switch

    The toggle light switch was invented in 1916 by William J. Newton. [2] As a component of an electrical wiring or home wiring system, the installation of light switches is regulated by some authority concerned with safety and standards. In different countries the standard dimensions of the wall mounting hardware (boxes, plates, etc.) may differ.

  3. Power system protection - Wikipedia

    en.wikipedia.org/wiki/Power_system_protection

    Power system protection is a branch of electrical power engineering that deals with the protection of electrical power systems from faults [citation needed] through the disconnection of faulted parts from the rest of the electrical network. The objective of a protection scheme is to keep the power system stable by isolating only the components ...

  4. Lighting control system - Wikipedia

    en.wikipedia.org/wiki/Lighting_control_system

    The term lighting control system refers to an intelligent networked system of devices related to lighting control. These devices may include relays, occupancy sensors, photocells, light control switches or touchscreens, and signals from other building systems (such as fire alarm or HVAC). Adjustment of the system occurs both at device locations ...

  5. North American power transmission grid - Wikipedia

    en.wikipedia.org/wiki/North_American_power...

    The electrical power grid that powers Northern America is not a single grid, but is instead divided into multiple wide area synchronous grids. [1] The Eastern Interconnection and the Western Interconnection are the largest. Three other regions include the Texas Interconnection, the Quebec Interconnection, and the Alaska Interconnection.

  6. Power system operations and control - Wikipedia

    en.wikipedia.org/wiki/Power_system_operations...

    The graph on the right describes an extremely simplified system, with three committed generator units (fully dispatchable, with constant per-MWh cost): [7] unit A can deliver up to 120 MW at the cost of $30 per MWh (from 0 to 120 MW of system power); unit B can deliver up to 80 MW at $60/MWh (from 120 to 200 MW of system power);

  7. Contingency (electrical grid) - Wikipedia

    en.wikipedia.org/wiki/Contingency_(electrical_grid)

    In an electrical grid, contingency is an unexpected failure of a single principal component (e.g., an electrical generator or a power transmission line) [1] that causes the change of the system state large enough to endanger the grid security. [2]

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  9. Islanding - Wikipedia

    en.wikipedia.org/wiki/Islanding

    In a power outage, the microgrid controller disconnects the local circuit from the grid on a dedicated switch and forces any online distributed generators to power the local load. [ 3 ] [ 4 ] Unintentional islanding is a dangerous condition that may induce severe stress on the generator, as the generator must match any changes in electrical ...

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