Medium voltage networks work as radial. In reality, however, such configurations of linear SN lines are provided, so that in the event of disturbances, do not completely deprive the receivers of power only to be able to make the changeover and feed them from another substation. For this reason, they are designed so that it is possible to connect with other MV lines. In the normal state these places are referred to as cut points and selected to minimize power losses. The article presents the method of optimal determination of cut points, using the heuristic optimization method. The calculations included two PV sources and their random nature of generation as well as loads in nodes.
Some quantities in the power industry, are subject to random changes, depending on the current state of the network, atmospheric conditions, or unforeseen, in normal conditions, events. It is difficult to describe them with classical dependencies, therefore a probabilistic approach seems to be appropriate. While analyzing the measurements of these quantities, for a certain period of time, an appropriate probability distributions can be assigned to them. The article presents the results of such considerations, for selected variables based on their real values. It should be noted that some quantities result from others (due to the connection), they are a kind of compilation.