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Insulation Condition Assessment in Inverter-Fed Motors Using the High-Frequency Common Mode Current: A Case Study

Author

Listed:
  • Mariam Saeed

    (Department of Electrical, Computer & System Engineering, University of Oviedo, 33204 Gijón, Spain)

  • Daniel Fernández

    (Department of Electrical, Computer & System Engineering, University of Oviedo, 33204 Gijón, Spain)

  • Juan Manuel Guerrero

    (Department of Electrical, Computer & System Engineering, University of Oviedo, 33204 Gijón, Spain)

  • Ignacio Díaz

    (Department of Electrical, Computer & System Engineering, University of Oviedo, 33204 Gijón, Spain)

  • Fernando Briz

    (Department of Electrical, Computer & System Engineering, University of Oviedo, 33204 Gijón, Spain)

Abstract

The use of the common mode current for stator winding insulation condition assessment has been extensively studied. Two main approaches have been followed. The first models the electric behavior of ground-wall insulation as an equivalent R C circuit; these methods have been successfully applied to high-voltage high-power machines. The second uses the high frequency of the common mode current which results from the voltage pulses applied by the inverter. This approach has mainly been studied for the case of low-voltage, inverter-fed machines, and has not yet reached the level of maturity of the first. One fact noticed after a literature review is that in most cases, the faults being detected were induced by connecting external elements between winding and stator magnetic core. This paper presents a case study on the use of the high-frequency common mode current to monitor the stator insulation condition. Insulation degradation occurred progressively with the machine operating normally; no exogenous elements were added. Signal processing able to detect the degradation at early stages will be discussed.

Suggested Citation

  • Mariam Saeed & Daniel Fernández & Juan Manuel Guerrero & Ignacio Díaz & Fernando Briz, 2024. "Insulation Condition Assessment in Inverter-Fed Motors Using the High-Frequency Common Mode Current: A Case Study," Energies, MDPI, vol. 17(2), pages 1-16, January.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:2:p:470-:d:1321440
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