Experimental method for generating electric arc in sleeve and pre-experimental device

The invention relates to the technical field of sleeve detection, and discloses an experiment method for generating an electric arc in a sleeve and a pre-experiment device. A pre-experiment device is used for simulating operation of a sleeve and generating an electric arc in a pre-experiment stage, and the voltage U of the electric arc per unit length is obtained; in the testing stage, a sleeve to be tested is provided, the sleeve comprises a middle guide rod and an end screen opening, and a conductive channel is machined between the middle guide rod and the end screen opening; a third conducting rod with one end provided with a second arcing wire is provided, the third conducting rod is installed at the end screen opening, and the second arcing wire penetrates through the conducting channel to be connected to the middle conducting rod; connecting one of the third conducting rod and the middle conducting rod with a power supply, and grounding the other; a preset loop current I1 is introduced into the control