A Negative Sequence Current Phasor Compensation Technique for the Accurate Detection of Stator Shorted Turn Faults in Induction Motors

Syaiful Bakhri and Nesimi Ertugrul
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Syaiful Bakhri: Research Centre for Nuclear Fuel Cycle and Radioactive Waste Technology, National Research and Innovation Agency of Republic Indonesia, Puspiptek Complex, Building 20, Tangerang Selatan 15314, Banten, Indonesia
Nesimi Ertugrul: Research Centre for Nuclear Fuel Cycle and Radioactive Waste Technology, National Research and Innovation Agency of Republic Indonesia, Puspiptek Complex, Building 20, Tangerang Selatan 15314, Banten, Indonesia

Energies, 2022, vol. 15, issue 9, 1-17

Abstract: Stator faults are the most critical faults in induction motors as they develop quickly hence requiring fast online diagnostic methods. A number of online condition monitoring techniques are proposed in the literature to respond to such faults, including the signature analysis of the stator current, vibration monitoring, flux leakage monitoring, negative sequence components of voltage and current and sequence components monitoring based on the identification of asymmetrical behavior in a machine. Negative sequence components of voltage and current and sequence components monitoring are commonly considered for the identification of asymmetrical behavior of induction motors. Negative sequence current analysis is a sensitive technique for the detection of shorted turns as it directly measures the asymmetry produced by the fault. However, the technique is sensitive to other asymmetrical faults and disturbances, which can also produce negative sequence currents. These disturbances include sensor errors, inherent asymmetry and voltage unbalance. This paper provides a comprehensive investigation of the disturbances using a motor model along with experimental measurements under varying load conditions. Then, a new phasor compensation technique is explained to eliminate such disturbances effectively. This technique enables the accurate detection of even relatively small shorted turn faults, even at an early stage. The technique is tested experimentally, and a set of practical results are given to validate the methods developed.

Keywords: condition monitoring; induction machines; negative sequence currents; shorted turn faults; phasor compensation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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