Application of novel bypass cable operation in distribution network line ring main unit

The invention belongs to the technical field of power systems and discloses an application of a novel bypass cable operation in the distribution network line ring main unit. The application is characterized by comprising the following steps: 1) preparing a mobile miniature power supply power network system which comprises an automobile, a vehicle-mounted ring main unit, a cable switching device and a device for connecting an overhead line cable into the vehicle-mounted ring main unit; 2) when the ring main unit connected with the overhead line cable on the distribution network line needs to bereplaced or repaired, disconnecting the cable of the ring main unit, wherein an input cable of the vehicle-mounted ring main unit is connected with an overhead line cable through a device for connecting the overhead line cable into the vehicle-mounted ring main unit, a transformer cable of the vehicle-mounted ring main unit is connected with a transformer connected with the ring main unit througha cable switching device,