Comparison of Two UV Imaging Parameters´s in the Insulator Fault Diagnosis

At present, the main parameter is the "ultraviolet flare area" and "flare diameter", in order to has a contrast in the insulator for fault diagnosis, in this paper, through the water spray classification method to choice normal, good, a mark, degradation and serious aging 5 kinds of insulation of the same kind of insulator. The platform structures is in the laboratory, the pressurized are 8 kV, 10 kV and 15 kV, through the South Africa CoroCAM504 UV camera to take enough UV insulator pictures under discharge conditions, using digital image processing algorithm extracting the two parameters, through MATLAB digital simulation, paper obtain the change of two parameters with insulating of state trend. The results show that: 1) when the insulator insulation is in good condition, flare area and flare diameter almost negligible, correspondence is better, conversely, in these two parameters are small, it\´s always good insulator insulation. 2) when the insulator insulation comes problems, both had a tendency to rise, but flare area have a turning point "4", and flare diameter not, this shows that when insulation degradation to certain degree, flare area is not too big, and differentiate the spot diameter can be distinguished. Ultimately it provides a quantitative assessment of the basis and certain guidance for insulator in the running status.