Abstract
The behavior of corona discharge was investigated in wire–cylinder electrodes under the effect of a crossed magnetic field. Townsend’s formula was used commonly with a modified empirical formula to evaluate the different parameters of corona discharge in positive and negative discharge. By using a least-squares fitting, the dimensional constants A, K, and the exponent n displayed a significant dependence on the applied magnetic field. An improvement of pre-breakdown has been achieved by using a crossed magnetic field. For both polarities, while the magnetic field is present, breakdown voltage VB and corona inception voltage V0 increased, whereas the corona current decreases. In addition, the corona inception voltage was greater in positive corona in the absence of a magnetic field, while the opposite occurred regarding the crossed magnetic field. Furthermore, the breakdown streamer demonstrated significant triggering in the negative corona by applying the magnetic field.
Highlights
B are shown in Figures 3 and 4 for positive and negative corona discharge,hand, respectively the maximum corona currents decreased by increasing the crossed magnetic field
The influence of the transverse magnetic field was demonstrated as a pronounced reduction in corona currents was more significant in negative discharge compared to that ward shifting of current-voltage characteristics for both discharge polarities
A significant downward trend of current-voltage characteristics of both discharge polarities was observed as the transverse magnetic field increased, where the reduction in corona current was more observable in the negative corona
Summary
The breakdown streamer demonstrated significant triggering in the negative corona by applying the magnetic field. The characteristics of positive and negative corona discharge have been studied in a wide variety of electrostatic processes. These studies were carried out in different geometrical configurations and various operating conditions to sustain a stable corona discharge for increased optimization of current–voltage characteristics [1,2,3,4,5,6]. The ionization of air molecules around the wire electrode induces a corona discharge due to electron avalanche. The positive ions created in the wake of electron avalanches drift out the ionization region and move along the conduction region to the outer cylinder, while the electrons are neutralized in contact with the positive surface of the wire.
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