Study of statistical data on the composition of electric distribution networks on the example of a Kaluga region districtV.E. Bolshev, A.V. Vinogradov, A.V. Vinogradova, A.V. Bukreev and S.R. KhasanovE3S Web Conf., 220 (2020) 01005DOI: https://doi.org/10.1051/e3sconf/202022001005