loading page

Close Accord on Partial Discharge Diagnosis During Voltage Harmonics in Electric Motors Fed by Variable Frequency Drives
  • +2
  • Waqar Hassan,
  • Muhammad Akmal,
  • Ghulam Amjad Hussain,
  • Ali Raza ,
  • Muhammad Shafiq
Waqar Hassan
Institute of Southern Punjab
Author Profile
Muhammad Akmal
Sheffield Hallam University

Corresponding Author:m.akmal@shu.ac.uk

Author Profile
Ghulam Amjad Hussain
American University of Kuwait
Author Profile
Ali Raza
University of Engineering and Technology
Author Profile
Muhammad Shafiq
Tallinn University of Technology
Author Profile


Partial discharge (PD) diagnostics test is reliable for estimating insulation health conditions in power system components. During laboratory PD diagnostics, the effect of harmonic components in the voltage waveform generated by variable frequency drives (VFD) fed electric motors (EMs) is often overlooked. However, these harmonic components can cause significant distortion in the applied voltage waveform. As VFD-fed EMs operate at low speeds, the harmonic concentration in the voltage increases. It has been found that PD activity in VFD-fed EM is significantly affected by the addition of harmonic components in the voltage, thus making it necessary to consider their impact when performing true PD diagnostics. This paper investigates the influence of voltage harmonic distortion produced in VFD-fed EM on PD severity and the subsequent insulation degradation. Eight VFD-fed EM are used to study PD behavior under different levels of harmonic pollution. The PD characteristics, such as inception voltage, pulse repetition rate, accumulated apparent charge, average discharge current, discharge power, and quadratic rate, are determined. With the help of probability distribution functions, the chance of PD activity and its severity at various voltage harmonic levels are estimated. The proposed technique can be used to plan maintenance activities that ensure reliability for industrial applications dealing with voltage harmonic distortion.
15 Mar 2023Submitted to IET Generation, Transmission & Distribution
18 Mar 2023Submission Checks Completed
18 Mar 2023Assigned to Editor
16 May 2023Reviewer(s) Assigned
17 Jul 2023Review(s) Completed, Editorial Evaluation Pending
27 Jul 2023Editorial Decision: Revise Minor
30 Jul 20231st Revision Received
03 Aug 2023Submission Checks Completed
03 Aug 2023Assigned to Editor
07 Aug 2023Reviewer(s) Assigned