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In order to evaluate the influence of AC flashover on the insulation performance of Ethylene Propylene Rubber (EPR) at different temperature, the characteristic indicators were studied, based on the polarization and depolarization current (PDC). In the paper, the partial discharge inception and extinction voltage and the flashover voltage were firstly measured under AC voltage at the ambient temperature...
Defects of Ethylene Propylene Rubber (EPR)cablesare the source of partial discharges, which will lead to insulation degradation. The flashover voltage and discharge properties along the surface of EPR were measuredunder edge to edge electrode, needle to edge electrode and rod to ring electrode. Experimental results show that the flashover voltage magnitude over EPR depends on the type of voltage....
The image analysis technology including Fast Fourier transform and spatial correlation functions are employed to investigate the spatial distribution of some hexagonal patterns obtained in dielectric barrier discharge system. Through Fast Fourier Transform, it is found that the wave vector increases with driving voltage increasing. Through spatial correlation functions calculation to the patterns,...
Spatial correlation function and fast Fourier transform (FFT) are important methods in analysis of pattern. In this paper, images of square, hexagonal and random filaments state are obtained in dielectric barrier discharge system with decreasing applied voltage. The average distance between neighboring filaments is analyzed by spatial correlation. It increases with the decreasing of the applied voltage...
Fast Fourier Transform is a kind of methods of image processing, which is used in this paper to analyze evolution of patterns observed in dielectric barrier discharge in air/argon. It is found that a new type of pattern named asymmetric hexagon pattern is a kind of superlattice pattern by analyzing the spatial Fourier spectrum. The evolution of the pattern with voltage increasing is not exactly the...
Discharge current has been measured to diagnose the discharge modes of dielectric barrier discharge in a coaxial geometry through a mixture flows of argon and trace of air at one atmospheric pressure. Experimental results show that there are two discharge modes in the dielectric barrier discharge, corona discharge mode and glow discharge mode. The corona discharge only occurs in the tip of needle...
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