Transformer-customer relationship identification for low-voltage distribution networks based on joint optimization of voltage silhouette coefficient and power loss coefficient

•A transformer-customer relationship identification framework according the data analysis of end-customers measurement data is proposed.•A novel joint optimization model for transformer-customer relationship identification is proposed.•This model is adapted to a variety of scenarios, overcoming the shortcomings of other methods and thus improving identification accuracy.•The effectiveness and universality of this model are verified using actual engineering data and simulation data.