Judgment method and system for short-circuit fault section of medium-voltage line of fusion terminal

The invention provides a method and system for judging a short-circuit fault section of a medium-voltage line of a fusion terminal, and the method comprises the steps: S1, carrying out the preliminary positioning of a fault section through a medium-low voltage cloud master station according to the distribution of fault current information reported by an FTU, and obtaining a first fault section; s2, the middle and low voltage cloud master station judges the type of the short circuit fault according to the fault current information distribution reported by the FTU; s3, the TTU reports the monitored voltage information to the middle and low voltage cloud master station; and the middle and low voltage cloud master station performs secondary positioning on the first fault section according to the fault type by adopting a short circuit fault section positioning method according to the voltage characteristics of the voltage information to obtain a second fault section of which the distance is not greater than that o