The evaluation of medium voltage motor's current and voltage harmonics during the loading conditions

This paper presents the results of investigating harmonic levels on medium voltage motors at loading conditions in air separation plants. The essential results of the measurement of the medium voltage motor harmonics are summarized in the values for the total harmonic distortion (THD). Motors loading case is used to assess the current and voltage harmonic distortions. Proper system analysis is important when adding any new motor starting and controlling equipment It will be able to better 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 linear regression model. The predicting THD values can be used for this kind of process for future planning.