One of the causes of service continuity problems in distributions systems is fast fault location. So far, most of fault location algorithms are based on transmission systems and do not take into account technical aspects of distribution systems. Here, the topic is carefully assessed to overcome this limitation. The present article proposes alternatives of solution to supply continuity problems such as interruptions and voltages sags. The main objective is the improvement of quality of service indices with the implementation of hybrid methodologies for fault location. The methodology requires very low investment from utilities since it utilizes measurements for fault locations obtained by meters placed at substations. The recorded data are analyzed with the aid of a software tool and they are complemented with technical information of the circuit. The tool consist of four modules: a common module in which the method is implemented and three independent modules that employ techniques of reasoning based on the knowledge such as the LAMDA technique, support vector machines and finite mixtures. With the application of this methodology to the identification and location of faults, results like fast fault recovery, interruptions of shorter duration and permanent fault prevention and attention will be obtained. These considerations in turn lead to the improvement of DES and FES indices.