Active injection type self-adaptive reclosing and distance measuring method based on circuit breaker

The invention relates to an active injection type self-adaptive reclosing and distance measuring technology based on circuit breakers, which comprises the following steps: step (1), after the circuit breakers trip to complete an isolation fault, capacitors C1 and C2 in the two circuit breakers discharge to a fault point, inject a negative step signal to a fault line, and generate a traveling wave under the action of the step signal; (2) when the traveling wave is propagated along the transmission line, refraction and reflection occur at a point where wave impedance changes, and fault property identification is carried out by utilizing identification of the first reflected wave; (3) if the fault is judged to be a transient fault, reclosing is carried out; and if the fault is determined to be a permanent fault, fault distance measurement is carried out so as to facilitate maintenance. Compared with a traditional fault distance measurement method, the method does not need to measure the wave velocity, and does n