This paper focuses on identifying the non-linear relationship between the voltage harmonic distortion and the percentage load of the most commonly used harmonic producing devices. The voltage harmonic distortion tsctor is calculated at each bus of a simulated distribution network under different loading conditions of each harmonic producing device. Then, Merent analytical models are used to find out the important features of the relationship between 4he voltage THD and the percentage load of the harmonic producing devices. Finally, this relationship is identified and p r t sented in its analytical form. The sensitivity of voltage harmonic distortion to the load of the harmonic devices is also discussed.

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