Transformer Scott Connection or T-T Connection

The Transformer Scott-T Connection is the method of connecting two single-phase transformers to perform the 3-phase to 2-phase conversion and vice-versa. 

The two transformers are connected electrically but not magnetically. One of the transformers is called the main transformer, and the other is called the auxiliary or teaser transformer.

Two transformers are used in this type of connection. One of the transformers has centre taps on both primary and secondary windings (which is called the main transformer). 

The other transformer is called a teaser transformer. Scott connection can also be used for three-phase to two-phase conversion. The connection is made as shown in the figure below.

Advantages: Compared to open delta and open Y  ‐open delta, a neutral can be connected to both the primary and secondary sides.

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