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Dielectric Barrier Corona Discharge Anomaly by Ionic Wind under Unipolar Voltage Excitation

Gan Fu

Abstract

An anomalous back discharge movement phenomenon is induced by a set of dielectric barrier corona discharges (DBCD) at unipolar half-sine voltage waveforms, where the back discharge has a time delay that relates to the applied voltage level. An ionic wind model is employed to analyze the physical behavior. Theoretical explanation and quantitative analysis are presented in this study based on abundant experimental results of 5 typical insulating materials and a FEP insulating cable. A numerical model is derived, which indicates that the back discharge can be activated under a relatively low potential voltage level in this study. The results highlight that the back discharge movement phenomenon behaves distinctly under half-sine voltage with negative polarity, yielding a significantly different partial discharge (PD) pattern with positive polarity. Besides, PD amplitude dependent on dielectric thickness is demonstrated by plotting in phase resolved partial discharge (PRPD) pattern. Furthermore, comparative experiments are conducted with respect to the variation of air gap length and dielectric geometry, manifesting different influences on PD amplitude.

Dielectric Barrier Corona Discharge Anomaly by Ionic Wind under Unipolar Voltage Excitation

Abstract

An anomalous back discharge movement phenomenon is induced by a set of dielectric barrier corona discharges (DBCD) at unipolar half-sine voltage waveforms, where the back discharge has a time delay that relates to the applied voltage level. An ionic wind model is employed to analyze the physical behavior. Theoretical explanation and quantitative analysis are presented in this study based on abundant experimental results of 5 typical insulating materials and a FEP insulating cable. A numerical model is derived, which indicates that the back discharge can be activated under a relatively low potential voltage level in this study. The results highlight that the back discharge movement phenomenon behaves distinctly under half-sine voltage with negative polarity, yielding a significantly different partial discharge (PD) pattern with positive polarity. Besides, PD amplitude dependent on dielectric thickness is demonstrated by plotting in phase resolved partial discharge (PRPD) pattern. Furthermore, comparative experiments are conducted with respect to the variation of air gap length and dielectric geometry, manifesting different influences on PD amplitude.
Paper Structure (13 sections, 4 equations, 9 figures, 2 tables)

This paper contains 13 sections, 4 equations, 9 figures, 2 tables.

Table of Contents

  1. Introduction
  2. Experimental
  3. PD measurement system
  4. Half-sine voltage waveform
  5. Sample cell and insulation materials
  6. Analysis method
  7. Mathematical model
  8. Results and discussion
  9. Influence of insulation material thickness
  10. Influence of air gap length
  11. Applied voltage polarity
  12. Influence of geometry
  13. Conclusion

Figures (9)

  • Figure 1: Oscilloscope images of corona discharges under unipolar half-sine voltages. (a) Negative half-sine. (b) Positive half-sine.
  • Figure 2: Diagram of time-resolved PD measurement system
  • Figure 3: Unipolar half-sine waveform
  • Figure 4: Diagrams of sample cells of DBCD configuration. (a) Needle-plane setup. (b) needle-cable setup.
  • Figure 5: Phenomenology of ionic wind under negative half-sine voltage waveform
  • ...and 4 more figures