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Which of the following statements is/are correct with respect to a Scott-connected transformer? I. It can do 3-phase to 2-phase conversion II. It can do 2-phase to 3-phase conversion III. It can do 2-phase to 4-phase conversion IV. It can do 3-phase to 4-phase conversion

Which of the following statements is/are correct with respect to a Scott-connected transformer? I. It can do 3-phase to 2-phase conversion II. It can do 2-phase to 3-phase conversion III. It can do 2-phase to 4-phase conversion IV. It can do 3-phase to 4-phase conversion Correct Answer Statements I and II

  • The 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.
  • The main transformer is center-tapped at D and is connected to line B and C of the 3-phase side. It has primary BC and secondary a1a2.
  • The teaser transformer is connected to the line terminal A and the center tapping D. It has primary AD and the secondary b1b2.
  • The identical, interchangeable transformers are used for Scott-T connection in which each transformer has a primary winding of Tp turns and is provided with tapping at 0.289 Tp, 0.5 Tp, and 0.866 Tp.
  • The teaser transformer has the primary voltage rating that is √3/2 or 0.866 of the voltage ratings of the main transformer.

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