What is the primary function of a transformer with a K-factor rating?

The primary function of a transformer with a K-factor rating is to handle non-linear loads. These transformers are specifically designed to mitigate the effects of harmonic distortion caused by non-linear devices, such as computers, fluorescent lighting, and other electronic equipment.

K-factor ratings indicate the transformer's ability to withstand the additional heating effects generated by harmonics in the electrical system. A higher K-factor means that the transformer can handle more harmonic content without overheating. Non-linear loads draw current in a non-sinusoidal manner, which can lead to excessive heating in standard transformers not rated for such conditions. Therefore, a transformer with a K-factor rating is critical in applications with significant non-linear loads to ensure reliable operation and longevity of the transformer and connected equipment.