Draft:K-factor (electrical engineering)

In electrical engineering, the K-factor of a transformer is a measure of how well it can handle harmonic distortion. Transformers which are designed to handle harmonic distortion are referred to as K-rated transformers.

Calculation
The following formula is used to calculate the K-factor of a transformer:


 * $$K = \sum_{h=1}^{\infin} I_h^2 h^2$$

Where:
 * $K$ is the K-factor
 * $h$ is the harmonic order
 * $I_{h}$ is the per-unit current at the $h$th harmonic order

Typical Values
The following table lists typical K-factors used depending on the harmonics produced by the loads: