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Single-phase electric power refers to the distribution of electric power using a system in which all the voltages of the supply vary in unison. Single-phase distribution is used when loads are mostly lighting and heating, with few large electric motors.

Do you know that there is a proposed 800-mile high-voltage direct current transmission line from Oklahoma to Tennessee?

Read more about it by clicking on the link.

Answer

A single-phase transformer is a simple transformer which will either step up, or step down, a single-phase voltage. A single-phase supply is a two-conductor alternating-current system, comprising a line conductor and a neutral conductor.

As most high-voltage electrical distribution systems are three-phase systems, comprising three line conductors, a single phase distribution transformer's primary (high voltage) winding is connected between any two of the three high-voltage line conductors. As far as the secondary (low voltage) winding is concerned:

  • in Europe, one end of the winding is earthed and provides the neutral terminal , while the opposite end provides the line terminal (L)
  • in North America, the winding is centre tapped and grounded, providing the neutral terminal, while opposite ends of the winding provide the line terminals L1 and L2
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Lewis Streich

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