Understanding Scott Connection in Transformers — Lesson 2

This lesson covers the concept of Scott connection in transformers, which is used to transform a 3-phase voltage into a balanced 2-phase voltage. The lesson explains the need for two transformers with different primary number of turns for this process. It also discusses the phasor diagram representation of the supply and the applied voltage across the transformers. The lesson further elaborates on the calculation of secondary currents and the conditions for a balanced 3-phase current on the primary side. The lesson concludes with a discussion on the application of Scott connection in real-world scenarios, such as two-phase induction motors or furnaces.

Video Highlights

01:39 - Detailed discussion on the phasor diagram of the Scott connection
07:01 - Discussion on the connection of a balanced 2 phase load to the Scott connection
09:33 - Explanation of the calculation of the reflected current on the primary side
19:32 - Explanation of the phasor diagram of the secondary side voltage and primary side current
29:59 -Discussion on the behavior of the Scott connection with unbalanced load on the secondary side

Key Takeaways

• Scott connection in transformers is used to transform a 3-phase voltage into a balanced 2-phase voltage.
• Two transformers with different primary number of turns are required for Scott connection.
• The phasor diagram helps in understanding the supply and the applied voltage across the transformers.
• The secondary currents can be calculated using the number of turns and the primary voltage.
• If the secondary current is balanced, the primary side will also have a balanced 3-phase current.
• Scott connection is used in real-world scenarios where a two-phase supply is needed, such as two-phase induction motors or furnaces.