An accurate fault location estimation algorithm based on application of artificial neural networks (ANN) for the protection of double circuit transmission lines is presented. The proposed Artificial Neural Network (ANN) protection scheme uses fundamental components of three phase voltages and current signals of both the circuits to learn the hidden relationship in the input patterns. This method is adaptive to the variation of fault resistance, fault inception angle and fault location. The

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... ation results show that all types of shunt faults can be correctly locatedunder varying system conditions. Large numbers of fault simulations using MATLAB/Simulink software has proved the accuracy and effectiveness of the proposed algorithm.