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Abnormal Time-Domain Current Spectrum of Inorganic Insulating Powder under DC Voltage

Author

Listed:
  • Yucui Xue

    (Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin 150080, China
    Institute of Electrical Engineering, Suihua University, Suihua 152061, China)

  • Wenmin Guo

    (Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin 150080, China)

  • Yunlong Sun

    (Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin 150080, China)

  • Zhonghua Li

    (Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin 150080, China)

  • Yongsen Han

    (Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin 150080, China)

Abstract

The total current of dielectrics under DC voltage consists of relaxation current and conduction current, which contains the information about the relaxation polarization and conduction. The time-domain spectrum (TDS) is an effective method to study the dielectric properties of insulating dielectrics. In this paper, the TDS method is also used to study the dielectric properties of the compressed inorganic hexagonal boron nitride (BN) and magnesium oxide (MgO) insulating powders. It is interestingly found that these inorganic insulating powders shows an abnormal TDS, where the current decreases monotonically to a certain level at first and then increases with time while in normal TDS the current decreases monotonically with time and finally reaches a steady value which is conduction current. The experiments verify that the abnormal phenomenon is attributed to the moisture absorption of powders during the testing process, which causes an increase in conductivity and leads to the increasing current at the end of testing time. The insulating powder cannot be regarded as a time-invariant system during the measurement, and the time-varying characteristic is mainly manifested in conduction. A time-domain least squares fitting method is presented and is effective to eliminate the deviation from normal TDS. The results of this paper provide a reference for dealing with abnormal TDS.

Suggested Citation

  • Yucui Xue & Wenmin Guo & Yunlong Sun & Zhonghua Li & Yongsen Han, 2022. "Abnormal Time-Domain Current Spectrum of Inorganic Insulating Powder under DC Voltage," Energies, MDPI, vol. 15(21), pages 1-11, November.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:21:p:8227-:d:962930
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    Cited by:

    1. Yucui Xue & Wenmin Guo & Yunlong Sun & Zhonghua Li & Yongsen Han & Hongxu Jia, 2023. "Study on Nonlinear Dielectric Properties of Micro Silica," Energies, MDPI, vol. 16(5), pages 1-12, March.

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