scholarly journals Pulse Current of Multi-Needle Negative Corona Discharge and Its Electromagnetic Radiation Characteristics

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3120 ◽  
Author(s):  
Chuang Wang ◽  
Xi Chen ◽  
Jiting Ouyang ◽  
Tie Li ◽  
Jialu Fu
Keyword(s):  
Corona Discharge ◽  
High Voltage ◽  
Electromagnetic Interference ◽  
Pulse Current ◽  
Ambient Air ◽  
Discharge Process ◽  
Negative Corona ◽  
Radiation Characteristics ◽  
Negative Corona Discharge ◽  
Discharge Structure

Negative corona discharge occurs widely in high voltage transmission lines and other “high voltage” uses, which can cause strong electromagnetic interference (EMI). In this research, the pulse current of multi-needle negative corona discharge and its electromagnetic (EM) radiation characteristics were studied and compared with that of single-needle negative corona discharge. A dipole radiation model was established to analyze the EM radiation characteristics of the negative corona discharge. The results show that the Trichel pulse discharge process of one discharge needle in multi-needle discharge structure will inhibit the discharge of the other discharge needles. It is only when the voltage reaches a certain threshold will the current and EM radiation fields of multi-needle discharge structure with a significant increasing of amolitude. The frequency of EM radiation of negative corona discharge is not affected by the number of needles, but is only related to ambient air pressure. This research provides a basis for detecting corona discharge sources in different conditions.

scholarly journals Pulse Current of Multi-Needle Negative Corona Discharge and Its Electromagnetic Radiation Characteristics

2018 ◽  
Author(s):  
Chuang Wang ◽  
Xi Chen ◽  
Jiting Ouyang ◽  
Jialu Fu
Keyword(s):  
Electromagnetic Radiation ◽  
Corona Discharge ◽  
Transmission Lines ◽  
Electromagnetic Interference ◽  
Ambient Pressure ◽  
Negative Corona ◽  
Radiation Characteristics ◽  
Radiation Model ◽  
Radiation Fields ◽  
Negative Corona Discharge

Negative corona discharges occur widely in high voltage transmission lines and charged aircraft, which can cause strong electromagnetic interference. Negative corona discharge is typically performed simultaneously at multiple discharge points. In this study, the current and its EM radiation characteristics of single-needle and multi-needle negative corona discharge in different conditions were tested. The current and electromagnetic radiation characteristics of the two discharge structures were compared. The dipole radiation model was established to analyze the EM radiation characteristics of the negative corona discharge.The results show that, It is only when the voltage reaches a certain threshold that the current and electromagnetic radiation fields of the multi-needle discharge structure will be superimposed and their amplitudes will increase significantly. The frequency of electromagnetic radiation signal does not change with the number of needles, cathode geometry and applied voltage, but only depends on ambient pressure. It provides a basis for detecting corona discharge sources under different conditions.

Effect of the Corona Discharge on ZnTe Film

2011 ◽  
Vol 314-316 ◽  
pp. 171-175 ◽  
Author(s):  
Na Ri ◽  
Guo Rong Li
Keyword(s):  
Electric Field ◽  
Corona Discharge ◽  
High Voltage ◽  
Discharge Current ◽  
Applied Voltage ◽  
Blue Shift ◽  
Negative Corona ◽  
Voltage Range ◽  
Negative Corona Discharge ◽  
Electric Field Treatment

The effect of corona electric field on the surface of Pr-doped ZnTe thin film was studied. The device which can produce the high-voltage corona electric field is developed and used. The V-A characteristics of positive and negative corona discharge between the adjacent needle plates were measured. Whether positive or negative corona discharge, the corona discharge current of the plate is increased with the applied voltage increasing; the voltage range of negative corona discharge is wider than that of the positive corona discharge, meanwhile under the same applied voltage, the negative corona discharge current is bigger, not only its curve is smooth, but also its discharge is stable. The thermal effect of electric field is small. The electric field strength is 7.0 kV•cm-1. By atomic force microscope, it is found that the size of particles becomes large and uniform, and the surface becomes rough with electric field treatment. The measurement results reveal that the average radius of particles is 108.70nm before the effect and 227.27nm after the effect. By UV-Vis Spectrophotometer, it is found that a strong optical absorption peak appears at the region of 220 - 250nm with electric field treatment. This means that the stronger light absorption peak turn out a blue shift under the effect of electric field. The phenomenon of the blue shift proves that the high-voltage corona electric field has an impact on the band gap of the film. The voltage range of the negative corona discharge is wide and stable. The thermal effect produced by the high-voltage corona electric field on the sample is very small, so usually it can be ignored. The high-voltage corona electric field can change the surface morphology of some films, makes the current density of the sample location increase in a small cross section. The negative high-voltage corona discharge should well be used to research in biophysics such as the transgenic plants. High-voltage corona discharge mutagenesis has become a new physical mutation technique. Introduction

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