Line selection system detection device and line selection system detection method

The invention discloses a line selection system detection device and a line selection system detection method, and belongs to the field of power systems, the line selection system detection device comprises a plurality of detectors installed in a plurality of switch cabinets, and two detection insulators in each detector and one ends of two connection insulators are installed on the inner wall of a box body; the first ends of the two conductive connecting pieces are movably connected with the other ends of the two detection insulators respectively; the other end of the connecting insulator is provided with a detachable connecting piece which is detachably connected with the second end of the conductive connecting piece; one end of the test line is connected with one of the two detection insulators, and the other end of the test line passes through a zero sequence current transformer in the switch cabinet and is connected with the other one of the two detection insulators; and one end of the connecting line is