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  2. Three-phase electric power - Wikipedia

    en.wikipedia.org/wiki/Three-phase_electric_power

    Inductive and capacitive loads will cause current to either lag or lead the voltage. However, the relative phase angle between each pair of lines (1 to 2, 2 to 3, and 3 to 1) will still be −120°. A phasor diagram for a wye configuration, in which V ab represents a line voltage, and V an represents a phase voltage. Voltages are balanced as

  3. Mathematics of three-phase electric power - Wikipedia

    en.wikipedia.org/wiki/Mathematics_of_three-phase...

    For example, balanced two-phase power can be obtained from a three-phase network by using two specially constructed transformers, with taps at 50% and 86.6% of the primary voltage. This Scott T connection produces a true two-phase system with 90° time difference between the phases.

  4. Polyphase system - Wikipedia

    en.wikipedia.org/wiki/Polyphase_system

    Between 1992 and 1995, New York State Electric & Gas operated a 1.5 mile 93kV 6-phase transmission line converted from a double-circuit 3-phase 115kV transmission line. The primary result was that it is economically favorable to operate an existing double-circuit 115kV 3-phase line as a 6-phase line for distances greater than 23–28 miles.

  5. Phase converter - Wikipedia

    en.wikipedia.org/wiki/Phase_converter

    An American Rotary Phase Converter with a Transformer. A phase converter is a device that converts electric power provided as single phase to multiple phase or vice versa. The majority of phase converters are used to produce three-phase electric power from a single-phase source, thus allowing the operation of three-phase equipment at a site that only has single-phase electrical service.

  6. Rotary phase converter - Wikipedia

    en.wikipedia.org/wiki/Rotary_phase_converter

    With increasing power output, three-phase motors have preferable characteristics to single-phase motors; the latter not being available in sizes over 15 hp (11 kW) and, though available, rarely seen larger than 5 hp (3.7 kW). (Three-phase motors have higher efficiency, reduced complexity, with regards to starting, and three-phase power is ...

  7. Nearly 30% of US drugstores closed in one decade, study shows

    www.aol.com/nearly-30-us-drugstores-closed...

    Nearly three out of 10 U.S. drugstores that were open during the previous decade had closed by 2021, new research shows. Black and Latino neighborhoods were most vulnerable to the retail pharmacy ...

  8. Rep. Debbie Wasserman Schultz (D-Fla.) on Thursday criticized President-elect Trump for saying the U.S. should take control of the Panama Canal and purchase Greenland. “It is utterly ...

  9. Three-phase AC railway electrification - Wikipedia

    en.wikipedia.org/wiki/Three-phase_AC_railway...

    The resistance of the rails used for the third phase or return is higher for AC than for DC due to "skin effect", but lower for the low frequency used than for industrial frequency. Losses are also increased, though not in the same proportion, as the impedance is largely reactive. [12] 3-phase pantograph on a Corcovado Rack Railway train in Brazil

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