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This paper presents the results of investigating harmonic levels on medium voltage motorsat loading conditions in air separation plant. The essential results of the measurements of the medium loading case is used to assess the curent and voltage harmonic distortions. Proper system analysis is important when adding a new motor starting and controling the equipment. With the result of the paper it is posible to suggest the most appropriate starting and control method. Two medium voltage motors of air separation unit measurement results and simulations are summarized. Both current and voltage harmonic distortions are fitted by using a linear and exponential regression model. The prediction of THD values can be used for this kind of process for future planning by utilities.