Bus protection ANN model with function approximation ability

For a long time, the application of ANN to relay protection is based on classification ability. Enough fault samples are crucial for the performance of the protection, but limited sample data can be actually available for the training of ANN model. In order to overcome the drawback, bus protection based on ANN model with function approximation ability is presented in this paper. Function approximation is one of the most important ability of ANN, a function object can be replaced by an ANN model with function approximation ability. Physical object of bus protection is a function with certain relation between inputs and outputs, which can be replaced by an ANN model, i.e. can be approximated by an ANN mathematical model. Based on the ANN model trained under normal bus operation conditions, the inner or outer fault can be distinguished successfully