Railway power transmission line fault judgment and isolation method

The invention discloses a railway power transmission line fault judgment and isolation method, and belongs to the field of electrified railway power systems, and the railway power transmission line comprises a primary transmission line and a comprehensive transmission line which are both double-end power supplies and are powered by a single power supply during normal work. The method comprises the following steps of: acquiring transient information before and after a fault by utilizing electric power telecontrol terminal devices (each station is provided with one electric power telecontrol terminal device) configured by system stations, extracting fault characteristics capable of representing a fault section, converting the fault characteristics into GOOSE fault characteristic quantity information, and configuring GOOSE intertripping information; the GOOSE communication function of the IEC61850 protocol is utilized to realize real-time transmission of fault information with the front and rear power telecontro