Self-adaptive protection device suitable for distribution line

The invention discloses a self-adaptive protection device suitable for a distribution line. The self-adaptive protection device comprises an acquisition module 100, a fault phase selection module 200,a protection module 300 and an output module 400, the acquisition module 100 is used for acquiring power frequency and traveling wave electric quantity of the distribution line in real time; the fault phase selection module 200 is connected with the acquisition module 100 and is used for determining a fault type and starting a protection module 300 according to a fault phase selection result; theprotection module 300 is connected with the acquisition module 100 and the fault phase selection module 200 in parallel, and is used for judging whether a fault is in a protection area or not according to different fault types after being started; and the output module 400 is connected below the protection module 300 and is used for receiving the judgment signal sent by the protection module 300,sending an alarm or trippi