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EPRI—Electric Power Research Institute (US) EPSA—Electric Power Supply Association; EQR—Electric Quarterly Report; ERA—Economic Regulatory Administration (part of United States Department of Energy; ERCOT—Electric Reliability Council of Texas, Inc, a regional transmission organization. (US)
Voltages in this article are the nominal single-phase supply voltages, or split-phase supply voltages. Three-phase and industrial loads may have other voltages. All voltages are root mean square (RMS) voltage; the peak AC voltage is greater by a factor of , and the peak-to-peak voltage greater by a factor of .
This gives a phase-to-phase voltage of 400 volts wye service and a single-phase voltage of 230 volts between any one phase and neutral. In the UK a typical urban or suburban low-voltage substation would normally be rated between 150 kVA and 1 MVA and supply a whole neighbourhood of a few hundred houses.
The loss of all electrical resistance at inconveniently low temperatures. superheterodyne receiver A radio receiver that changes incoming frequencies to a fixed intermediate frequency for processing. superposition theorem The useful property of a system where the response to the sum is the sum of the responses. surge arrester
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]
Electrical energy must typically be generated at the same rate at which it is consumed. A sophisticated control system is required to ensure that power generation closely matches demand. If demand exceeds supply, the imbalance can cause generation plant(s) and transmission equipment to automatically disconnect or shut down to prevent damage.
Electrical sockets for industrial, commercial and domestic purposes generally provide two or more current carrying (live [10] [11]) connections to the supply conductors. These connections are classified as poles. A pole will be either a neutral [12] connection or a line [13]
One voltage cycle of a three-phase system. A polyphase system (the term coined by Silvanus Thompson) is a means of distributing alternating-current (AC) electrical power that utilizes more than one AC phase, which refers to the phase offset value (in degrees) between AC in multiple conducting wires; phases may also refer to the corresponding terminals and conductors, as in color codes.