1. A method comprising: clustering multiple voltage time series measurements into one or more groups, wherein said multiple voltage time series measurements are derived from one or more sensors; determining a connectivity model based on the one or more groups; comparing the determined connectivity model to an existing connectivity model to detect one or more inconsistencies between the determined connectivity model and the existing connectivity model; and updating the existing connectivity model based on said one or more detected inconsistencies; wherein at least one of the steps is carried out by a computing device.