Checking method of feeder-transformers relationship based on characteristic representation of voltage time series

Aiming at the time-consuming and labor-consuming problem of manually checking the 10kV feeders and transformers relationship in distribution network, this paper proposes a checking method of feeder-transformers relationship based on the characteristic representation of the voltage time series. Firstly, the voltage data is cleaned and preprocessed to obtain the compliant voltage data set and calculation three-phase voltage of ABC into a single-phase voltage. Then, for each transformer, the voltage time data are divided into several sub series of the same length. Each time point of the voltage time subseries is extended to feature vectors containing global and local characteristics. Then calculate the characteristic covariance matrix of the voltage sub series eigenvector matrix, and measure the distance of the characteristic covariance matrix between the two distribution variables, and form the distance matrix of the distribution variables. A class with few clusters is obtained by hierarchical clustering method, and it is judged as wrong distribution of line variable relationship. Experiment shows that the method can be used to verify the correctness of feeder-transformer relationship and has the value of wide application.