Understanding Phase Conversion in Transformers — Lesson 3

This lesson covers the concept of phase conversion in transformers, specifically focusing on three-phase to two-phase and three-phase to six-phase conversions. It explains the Scott Connection, which is used for three-phase to two-phase conversion, and then delves into the process of converting a three-phase supply into a six-phase supply. The lesson also discusses the application of these conversions in motors and AC to DC conversions using diodes. It further explains how to generate six voltages on the secondary side with equal magnitude and 60° phase difference to create a balanced six-phase voltage. The lesson concludes with a discussion on the parallel operation of transformers and how to determine the equivalent circuit parameters of a three-phase transformer.

Video Highlights

02:20 - Explanation of how to convert three phase to six phase using two three phase transformers
09:25 - Explanation of how to use delta connection for phase conversion
13:22 -Explanation of how to find out the equivalent circuit parameters of a three phase transformer
18:04 - Explanation of how to calculate the parameters for the equivalent circuit
26:59 - Explanation of how to carry out the tests if the transformer is star delta connected

Key Takeaways

• Phase conversion in transformers involves changing the number of phases in a power supply, which can be useful in various applications such as motors and AC to DC conversions.
• The Scott Connection is a method used for converting a three-phase supply into a two-phase supply.
• A three-phase supply can also be converted into a six-phase supply, resulting in six voltages on the secondary side with equal magnitude and 60° phase difference.
• The equivalent circuit parameters of a three-phase transformer can be determined through open circuit and short circuit tests.