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Capacitors are one of the most critical components in power electronic converters, yet they are notoriously susceptible to failure. Avoiding unforeseen outages caused by capacitor failures is one of the most effective approaches to increase system availability. Therefore, a variety of methods have been proposed to monitor a capacitor health condition based on different degradation indicators. This paper proposes a new approach based on the accurate measurement of an electrolytic capacitor dissipation factor to detect its end-of-life. Since the dissipation factor is affected by both the capacitor resistance and capacitance simultaneously, it can provide more information about the health condition of the capacitor. To employ the dissipation factor as an aging indicator, beyond its accurate measurement, it must be possible to establish an end-of-life criterion and investigate the effect of other environmental factors. Therefore, increasing the frequency of the dissipation factor measurement has been suggested as a solution to minimize the effect of the angle measurement error, for which an optimal frequency range has been calculated. In the following, several electrolytic capacitors are subjected to a laboratory study to investigate the effects of capacitor aging, temperature, and measurement frequency on the dissipation factor. According to the obtained results, changes in the capacitor resistance dominate the dissipation factor, thereby, enabling the same end-of-life criterion to be applied for monitoring a capacitor condition.
Original languageEnglish
JournalI E E E Journal of Emerging and Selected Topics in Power Electronics
Pages (from-to)1
Number of pages1
Publication statusPublished - 2022


  • Reliability
  • Condition Monitoring
  • Capacitor
  • electrolytic capacitor
  • Capacitors
  • dissipation factor
  • predictive maintenance
  • end-of-life criteria
  • Frequency measurement
  • Condition monitoring
  • Temperature measurement
  • Temperature sensors
  • loss angle
  • Capacitance
  • Impedance
  • Monitoring


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