Novel high-voltage cable sheath layer fault detection and disposal method

The invention relates to the technical field of electrical equipment, and discloses a novel high-voltage cable sheath layer fault detection and disposal method, which comprises the following steps of: acquiring three-phase current of a main cable and three-phase current of each crossed interconnection grounding box; calculating a main cable phase current effective value Ix, a cross interconnection grounding box phase current effective value Iix and a main cable current average value I; a circulation ratio kix is calculated, a threshold value # imgabs0 # is set, and the circulation ratio kix is compared with the threshold value # imgabs1 #; judging whether the circulation ratio kix is equal to 0 or not; recording the number Y of which the circulation ratio kix of the ith cross interconnection grounding box is greater than a threshold value # imgabs2; calculating the ratio J of the current of the cross interconnection grounding box, and judging the fault type according to the J value; recording the number Z of