A New Research for Internal Fault Simulation Model of Transformer

In order to improve the ability of transformer differential protection in the internal fault identification, this paper proposes a algorithm based on the magnetic transient model for the internal fault simulation of three-phase and three-leg transformer, the internal fault parameters of model are relative to the transformer structure. The established process of Internal fault model for three phase and three-leg transformer is given particularly. The simulating calculation considers a new fitting method for the hysteresis loop of transformer based on SVM (support vector machine) is set forth, which is original optimization of the hysteresis loop test data regression translates into the allelomorph optimization. According to the fractal characteristic of local hysteresis loop ,a research for internal fault simulation of three-phase and three-leg transformer is put up .The application of the proposed algorithm to a test system shows its validity and correctness.