The objective of this document is to show the elaboration of a computational algorithm developed in the electric network operator Enel Codensa for the evaluation of studies of reliability and load flows applied to electrical distribution systems developed within the area of the company designs and works in medium voltage, which seeks to carry out an evaluation of a system of electrical power under initial conditions and in different operating scenarios, allowing contrast the results obtained in each of the case studies. This implementation is carried out during the internship developed within the company with the aim of complying with one of the degree requirements to opt for the degree of electrical engineer from the Francisco District University José de Caldas.