T-connection power transmission line fault branch diagnosis method

The invention discloses a T-connection power transmission line fault branch diagnosis method, which comprises the following steps of: firstly, decoupling voltage traveling wave data and current traveling wave data by using initial voltage traveling wave data and initial current traveling wave data of three-end measuring points in a T-connection power transmission line area, and combining decoupled modulus information; calculating the sum of initial traveling wave reactive power mean values of corresponding short-time window sequences under multiple frequencies of the T-connection power transmission line based on S transformation, comparing the sum of reactive power mean values of corresponding short-time sequences of every two traveling wave protection units, and forming a fault feature vector sample set of the T-connection power transmission line; and training and testing the random forest fault identification model by using the sample set so as to diagnose the fault branch of the T-connection power transmis