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Scott T Transformer

 
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Scott-T transformer
 
 
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A Scott-T Transformer (also called a Scott Connection) is a type of circuit used to derive two-phase
Two phase

Two-phase electrical power was an early 20th century polyphase system alternating current electric power distribution system. Two circuits were used, with voltage phase s differing by 90 degree s....
 (2-f) current from a three-phase
Three-phase

In electrical engineering, three-phase electric power systems have at least three conductors carrying voltage waveforms that are 2p/3 radians offset in time....
 (3-f) source or vice-versa. The Scott connection evenly distributes a balanced load between the phases of the source.

The Scott-T Transformer connection may be also be used in a back to back T to T arrangement for a three-phase to 3 phase connection.






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A Scott-T Transformer (also called a Scott Connection) is a type of circuit used to derive two-phase
Two phase

Two-phase electrical power was an early 20th century polyphase system alternating current electric power distribution system. Two circuits were used, with voltage phase s differing by 90 degree s....
 (2-f) current from a three-phase
Three-phase

In electrical engineering, three-phase electric power systems have at least three conductors carrying voltage waveforms that are 2p/3 radians offset in time....
 (3-f) source or vice-versa. The Scott connection evenly distributes a balanced load between the phases of the source.

Scott T
The Scott-T Transformer connection may be also be used in a back to back T to T arrangement for a three-phase to 3 phase connection. This is a cost saving in the smaller kVA transformers due to the 2 coil T connected to a secondary 2 coil T in-lieu of the traditional three-coil primary to 3 coil secondary transformer. In this arrangement the X0 Neutral tap is part way up on the secondary Teaser transformer see below. The voltage stability of this T to T arrangement as compared to the traditional 3 coil primary to three-coil secondary transformer is questioned.

Nikola Tesla
Nikola Tesla

Nikola Tesla was an inventor and a mechanical engineer and electrical engineer. Tesla was born in the village of Smiljan near the town of Gospic, in Croatia ....
's original polyphase power system
Polyphase system

A polyphase system is a means of Power distribution alternating current electric power. Polyphase systems have three or more energized electrical conductors carrying alternating currents with a phase between the voltage waves in each conductor....
 was based on simple to build two-phase components. However, as transmission distances increased, the more transmission line efficient three-phase system became more prominent. Both 2-f and 3-f components coexisted for a number of years and the Scott-T transformer connection allowed them to be interconnected.

Assuming the desired voltage is the same on the two and three phase sides, the Scott-T transformer connection (shown below) consists of a center-tapped 1:1 ratio Main transformer
Transformer

A transformer is a device that transfers electrical energy from one electrical network to another through inductive coupling conductors — the transformer's coils or "windings"....
 T1 and an 86.6% (0.5v3) ratio Teaser transformer T2. The center-tapped side of T1 is connected between two of the phases on the three-phase side. Its center tap then connects to one end of the lower turn count side of T2, the other end connects to the remaining phase. The other side of the transformers then connect directly to the two pairs of a two-phase four-wire system.

See also

  • Symmetrical components
    Symmetrical components

    In electrical engineering, the method of Symmetrical components is used to simplify analysis of unbalanced three phase power systems....
  • Alternating current
    Alternating current

    In alternating current the movement of electric charge periodically reverses direction. An electric charge would for instance move forward, then backward, then forward, then backward, over and over again....
  • Single phase
  • Three-phase
    Three-phase

    In electrical engineering, three-phase electric power systems have at least three conductors carrying voltage waveforms that are 2p/3 radians offset in time....
  • Polyphase coil
    Polyphase coil

    Polyphase coils are electrical coils connected together in a polyphase system such as a electrical generator or electric motor. In modern systems the number of phases is usually three, or a multiple of three....