Quantifying the Probability of Partial Discharge in VFD Fed Electric Motors under Voltage Harmonics Concentration

HASSAN, W, HUSSAIN, GA, MAHMOOD, F and AKMAL, Muhammad (2022). Quantifying the Probability of Partial Discharge in VFD Fed Electric Motors under Voltage Harmonics Concentration. In: 2022 20th International Conference on Harmonics & Quality of Power (ICHQP) Proceedings. Power Quality in the Energy Transition. IEEE.

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Official URL: https://ieeexplore.ieee.org/document/9808627
Link to published version:: https://doi.org/10.1109/ICHQP53011.2022.9808627
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    Partial discharges (PD) diagnostics are considered as reliable techniques for the insulation health assessment of various electrical components of the power system. Generally, PD diagnostic tests are performed in laboratory by ignoring the effect of harmonic pollution in test voltage waveform. However, the operation of electric motors (EMs) fed by variable frequency drives (VFD) produces harmonic distortion in the sinusoidal test voltage waveform. During low speed operation of VFD, the influence of harmonic distortion in test voltage waveform is increased. The additional distortion parameters in the test voltage waveform can significantly increase the PD activity in the EM insulation. Therefore, for correct understanding of PD data, it is essential to consider the actual harmonic spectrum of the test voltage waveform during online PD measurement. This paper presents a methodology for the quantification of the probability of PD in VFD-fed EMs under different concentration of voltage harmonics. For the experimental work, PD diagnostic tests have been performed under variable operating conditions of eight EMs and PD severity is investigated by calculating the PD characteristic parameters at different harmonic distortion levels. Also, the probability density functions and cumulative distribution functions for several probability distributions were evaluated to statistically process the PD data at different harmonic levels. Finally, the distribution fitting tools have been implemented to find an appropriate distribution that can precisely characterize the probability of PD under different concentration of voltage harmonics. The proposed method may be utilized for studying the effect of harmonic distortion on PD activity and estimating the lifetime of stator insulation in EMs.

    Item Type: Book Section
    Additional Information: Series ISSN: 2164-0610 Conference 29 May 2022- 01 June 2022, Naples, Italy. © 2022 IEEE.  Personal use of this material is permitted.  Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
    Identification Number: https://doi.org/10.1109/ICHQP53011.2022.9808627
    SWORD Depositor: Symplectic Elements
    Depositing User: Symplectic Elements
    Date Deposited: 06 Sep 2022 13:24
    Last Modified: 06 Sep 2022 13:24
    URI: http://shura.shu.ac.uk/id/eprint/30672

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