Technical Diagnostics and Non-Destructive Testing, 2021, №02



2021 №02 (04)

DOI of Article 10.37434/tdnk2021.02.05

2021 №02 (06)

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Technical Diagnostics and Non-Destructive Testing #2, 2021, pp. 38-45

Diagnosis of induction motors by using the influence of higher current harmonics

E.V. Demenchuk¹, V.P. Shaida², L.V. Shilkova², O.Yu. Yurieva²

¹PJSC «Ilyich Iron and Steel Works». 1 Levchenko str., 87504, Mariupol, Ukraine. E-mail: eduard.demenchuk@metinvestholding.com
²National Technical University «Kharkiv Polytechnic Institute». 2 Kyrpychova str., 61002, Kharkiv, Ukraine. E-mail: viktor.shaida@khpi.edu.ua

The questions of the influence of current harmonics of a power supply network on the work of induction electric motors in the conditions of the modern energy-intensive enterprise are considered. It is proposed to use dynamic testing to diagnose the operation of AC motors powered by the general network. The influence of frequency-regulated electric drives on the general power supply network is determined. The sinusoidal shape of the network current is distorted. The harmonious composition and magnitudes of the amplitudes of higher harmonics in the distributions of phase voltages and currents of the studied induction motors are obtained. The operation of АС motors, when powered from the general network with connected and unconnected frequency-regulated electric drives, is analyzed. The consequences of the operation of AC motors when working with the nonsinusoidal distribution of phase currents in time are revealed. Deviations in the parameters of the general network, powering the electric motors, which can lead to failure of electric machines, are determined. It is proved that when AC motors are powered from a network with frequency-regulated electric drives, there appear pulsations in the torque spectrum at frequencies that are not inherent in normal operation. Peculiarities of balancing the rotating parts of the units during operation of frequency-regulated electric drives in the general electric network are revealed. Ways to solve this problem are suggested. 11 Ref., 17 Fig.
Keywords: induction motor, dynamic testing, general power supply network, frequency-regulated electric drives, higher harmonics of current and voltage, non-sinusoidal distribution of phase currents in time, torque spectrum, balancing of rotating parts

Received: 22.03.2021

References

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