Efficient active-adaptive sectionalizing elements are being introduced in the distribution grids (DN) of the Russian Federation: reclosers and load disconnectors, which contribute to both self-repair of the grid in case of unstable faults and localization of stable faults. In each specific case, the implementation of measures in DNs should take into account their economic feasibility depending on: the amount of power shortages and consumer losses; the location of points of optimal network division affecting the amount of load losses; reliability indicators (RI) of equipment and its cost; acceptable payback periods for modernization and sectionalization of sites. The article is devoted to the solution of an urgent problem - the development of a combined model for assessing the efficiency of measures and sectionalization equipment in DNs equipped with smart metering of electric power (EP) devices. The model combines the advantages of both experimentally statistical and deterministic approaches and a high level of adequacy. The decision criteria are: the values of load losses, under-releasing of EP and damage to consumers, frequency, and duration of power interruptions, ensuring standard voltage levels at the points of EP release. The article also describes the algorithm of interaction of the efficiency model as a module of the analytical complex (AC) of the integrated expert diagnostic system (IEDS) of 10/0.4 kV DC equipment with sections of the relational database (DB). The AC calculation modules and the DB file system are the complexes of the formed IESD (Knowledge Base).