Fuzzy logic techniques to limit lightning surges in a power transformer

Lightning surges can cause major damage to distribution network components, specially to transformers, therefore it is important to select an appropriate protection scheme to limit the damage caused by these overvoltages. The purpose of this work is the development of a method to calculate the surge arrester position in distribution systems, using fuzzy logic techniques, in order to establish failure risks lower than the admissible and to install the least number of arresters. The development of a computer application using the Matlab program allows the determination of the accurate position of the surge arrester in power systems, controls the risk of failure, thus permitting the selection of appropriate protection schemes for each network. We can reach important conclusions of the transformer protection using simplified models in the network analysis.