The authors described a model for predicting the improper operation of microprocessor relay protections caused by the flow of geo-induced currents in the secondary circuits during geomagnetic storms. The model is based on the mathematical method of Takagi-Sugeno. The simulation was performed using an adaptive neural fuzzy network. The ANFIS-editor of the Fuzzy Logic Toolbox extension package in Matlab was used. Since the parameters under study are probabilistic in nature, Gaussian functions were used in the prediction. Input parameters are the date, time and variations of the components of the geomagnetic field. The output data are predictions of malfunctioning microprocessor relay protection in the power system. Using the model, the dependencies between the studied parameters were revealed, the influence of these parameters on each other was evaluated.
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