Calculation of X-ray Intensity Distribution of Typical Structure of High Voltage Cable and Joints

Abstract

The use of X-ray excitation is helpful for the detection of cavity defects in high-voltage cable joints. The X-ray intensity distribution inside the cable and joint is helpful for the selection of X-ray radiation intensity and the diagnosis of defects. In this paper an X-ray intensity distribution model was set up and the X-ray intensity distribution of typical structure of high voltage cable was calculated. The X-ray attenuation characteristics of the main materials in the high voltage cable and joints were discussed and the attenuation equation was set up. The cable section was divided into multiple regions the geometric center was selected for each region and the X-ray intensity value of the geometric center is calculated using the X-ray attenuation equation. Then use it to replace the X-ray intensity of the entire region so that each region can be solved separately. The results show because the attenuation coefficient under different X-ray strength is different the change of being obscured by the cable conductor is also nonlinear with X-ray. The shielding of the X-ray by the cable conductor is significant which can be avoided by multi-directional irradiation or increasing the intensity of the X-ray.