Which configuration is used in three-phase transformers that can experience issues with harmonic currents?

The Wye connection, also known as the star connection, is the configuration used in three-phase transformers that can experience issues with harmonic currents. This configuration is versatile and commonly employed in both transmission systems and transformer applications.

In a Wye connection, each phase is connected to a common neutral point, which allows for a balanced load and reduces phase voltage for each winding. However, one of the drawbacks of this setup is its susceptibility to harmonics. When non-linear loads are present, such as in industrial environments, these loads can introduce harmonic currents into the system. Since harmonics can circulate in the neutral and can cause overheating and inefficiencies, the Wye configuration's low impedance path for these currents makes it particularly vulnerable.

The transformed voltage in a Wye configuration is lower by a factor of √3 compared to the line voltage, making the isolation of harmonics easier to identify. The design of the Wye connection and its ability to include a neutral conductor further exacerbate the effects of harmonics, leading to potential complications such as equipment damage or reduced performance.

This understanding of the impacts of harmonics is crucial for engineers and technicians working with three-phase transformers and helps inform decisions about system design and protection measures.