Influence Factors of Induced Current under Cross-Bonded Mode of Cables Laid along Bridge

Cross-bonded grounding can reduce the induced voltage difference between the direct grounding points at both ends, inhibit the induced current of the metal sheath, and thus become one of the main grounding methods for cable lines. By establishing the model of the cross-bonded section of the cable, the grounding current under different conditions was solved, and the influence of the length of each unit of the cross-bonded section, grounding resistance, load and whether the same ground point was used at both ends on the grounding current was studied.The results show that whether the same ground point was used at both ends of the crossover interconnect section had the greatest imbalance of the ground current. Therefore, it is suggested that different grounding systems should be adopted at both ends of the cross-bonded section as far as possible to reduce the amplitude and imbalance of grounding current under the premise of ensuring that the length of each unit section is close in the actual project.