Fixed point case of fault in the outer protective

    According to the information from project leader XXX, the insulation resistance of the B-phase outer protective layer between joint 5 # and joint 7 # cannot be shaken up. Before November 29th, professional technicians from other cable companies had tried high-voltage bridge method and impulse discharge acoustic measurement method. After several days of testing, the high-voltage bridge method galvanometer could not be adjusted to the zero position, and under impulse discharge, it was difficult to identify and identify the point of damage to the outer protective layer.