Research on evaluation method of water-blocking property of buffer layer in HV cable based on image processing
High-voltage(HV)cables have been widely used in urban transmission networks,and the ablation fault of semi-conductive buffer layer has become a research hotspot.The conductivity and water absorption characteristics of the buffer layer that induce ablation faults are the key to research,and they are also the basis for evaluating the quality of the buffer layer of HV cables.A longitude water-blocking property evaluation method of buffer layer based on image processing is proposed in this paper.The microscopic images of buffer layer are enhanced and morphologi-cally processed.The area fraction method,entropy method and fractal dimension method are used to evaluate the dis-tribution characteristics of buffer layer water-blocking powder in binary images.The comprehensive evaluation method is adopted and then the influences of the density and dispersion of water-blocking powder are considered through weight coefficients.The comprehensive evaluation parameter is validated by a water blocking test.Based on the tech-niques proposed in this paper,the water-blocking property of buffer layer can be evaluated efficiently and accurately.Furthermore,the technical basis for the sampling inspection and quality test can be then established.
high voltage cablebuffer layerwater-blocking propertyrelative entropybox dimension
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