Distribution network disconnection fault active positioning method and research and judgment system

The invention relates to a distribution network disconnection fault active positioning method and a research and judgment system. The method comprises the following steps: step 1, calculating the three-phase voltage unbalance degree of all distribution transformers in a global situation in real time; 2, judging whether the unbalance degree of the distribution transformer is higher than 20% or not, and if not, returning to the step 1; if the judgment result is yes, entering the next step; step 3, judging whether the three-phase voltage unbalance of the 10kV bus occurs or not, and if not, returning to the step 2; if the judgment result is yes, entering the next step; step 4, combining adjacent normal distribution transformer positioning and a position between the normal distribution transformers as a broken line position; step 5, positioning a broken line position and then actively pushing broken line fault information; the method has the advantages that real-time global calculation and active alarm are achieve