Line fault arc extinguishing critical value test method based on asymmetric power distribution network

The invention discloses a line fault arc extinguishing critical value test method based on an asymmetric power distribution network. The method comprises the following steps that resistors, reactors,capacitors to ground, insulators, voltage transformers and current transformers are installed on a test bed and are divided into three groups, each group corresponds to one phase of three-phase voltage, and the voltage transformers and the current transformers are electrically connected with the input end of a computer analysis unit; and fuses are suspended at the two ends of the three insulatorsin sequence, and three-phase voltage consistent with the voltage class of the power distribution network is connected until the fuses suspended on the insulators are fused to obtain the time requiredfor instantaneous ground fault arc extinguishing of the line where each insulator is located under the test parameters. According to the method, the situation that a single-phase instantaneous grounding fault occurs in a real a