The Research on Ablation Characteristics of Oil and Gas Pipeline Under Power Frequency Current

When the transmission line has a short circuit to ground at the tower, the power frequency short circuit current will flow into the ground through the grounding device, posing a threat to the buried pipeline around the grounding conductor. The ablation test platform of pipeline samples was built in the paper, the ablation test of pipeline under power frequency current was carried out when the current and arcing time were controlled respectively, and the ablation depth, ablation area, ablation volume and other parameters were measured. A time current factor consisting of current and arcing time is proposed to characterize ablation energy, and multivariate nonlinear regression analysis is conducted for the coefficient. The results show that the weight loss, volume and depth of ablation have obvious linear relationship with the corresponding time and current factors respectively, while the linear relationship between ablation area and temperature and the optimized time and current factors is weak, and the data shows obvious dispersion.