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Effect of soil discharge channels on cables under lightning strikes

Soil discharge channels formed by high-amplitude impulse current have differing spatial structures that affect the interference on adjacent cables through alteration of the electromagnetic field. This work built a test and observation platform for the further study of the interference effect of soil discharge on a cable under an impulse current. Images of soil discharge channels were captured and the relative angle between the discharge channel and cable was extracted to reflect their relative position. A smaller relative angle corresponded with a closer relative position. Furthermore, measurements of the coupling current of the cable shielding and the grounding potential revealed that the discharge channel affects the local potential surrounding the cable. The test results show that a closer relative position results in larger in-soil local potential surrounding the cable, and the maximum amplitude of the surface potential of the cable differs by a factor of 1.33∼1.45 across different relative positions.