Fault removal method for dual-power supply line

The invention discloses a dual-power supply line fault removal method, which comprises the following steps of: butting each ring main unit through a cable junction box to form an access; the communication among the tested switch, the left adjacent switch and the right adjacent switch is normal; the two switches are in a switching-on position; the states of the detected switch, the left adjacent switch and the right adjacent switch are detected, and whether short circuit occurs between lines is judged; when the dual-power supply line breaks down, the detected switch detects that the phase current is larger than a setting fixed value or the zero-sequence current is larger than the setting fixed value, and after intelligent distributed fault tripping time, only one of the adjacent switches on the left side and the right side of the detected switch is in a first state; and judging that the detected switch is a fault removal switch. According to the invention, under the condition that a fault occurs at a certain p