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

Abstract

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.

Observations of corona point discharges from grounded rods under thunderstorms

“…Qualitative features of positive and negative corona are very similar to those observed in other studies (i.e. Kexin et al, 2015;Wang et al, 2017;Moreau et al, 2018;Wang et al, 2018). For the same applied voltage, positive corona pulses have higher amplitudes and lower frequency in comparison to negative corona pulses.…”

“…The shunt resistor affects significantly the shape of the waveform, since current pulses are very fast, with a rise time of tens of nanoseconds and decay of a few hundreds of nanoseconds (e.g. Kexin et al, 2015;Wang et al, 2017;Dordizadeh et al, 2017;Wang et al, 2018). If higher values of resistors are used, current pulses have a longer duration.…”

“…The so-called corona current is the current measured through the resistor. For the initial stages of corona discharge (burst corona and Trichel pulse corona), the current is observed as a regular train of pulses with a short rise time (tens of nanoseconds), and time decay in the order of few hundreds of nanoseconds and rather long inter-pulse time (a few microseconds to milliseconds), depending on the configuration of electrodes and the voltage applied (Dordizadeh et al, 2015;Wang et al, 2018). This work comprises experiments with grounded conductors with sharp tips under high background electric fields.…”

Demonstration of static electricity induced luminescence

“…The electric field in the plasma region cannot provide sufficient energy for the electrons. Therefore, the electrons combine with the neutral air molecules to form negative ions in the plasma region, then enter the drift region, and move towards the ground electrode 36 . In other words, in corona discharge, negative ions are emitted from the needle electrode and are incident to the SEL film owing to the potential difference between the needle electrode and the ground (Fig.…”

Dependence of inter-electrode gap separation on the Positive and Negative Pin-Grid Plasma Corona Discharge

“…Corona discharge has been studied for many years because of its potential applications. The corona discharge in point-plane electrode geometry has been used as a negative ion source in electrical appliances, and in mass and ion mobility spectrometers [3]. Later it was empirically found that the Townsend relation could also be used approximately for point-toplane geometry, as Henson disclosed [4].…”