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Thesis mainly ysis compared existing transformer bad the characteristics moving protection calculate way laid equal stress on to order to introduce to imitate to really win adoptive of double ratio bad move calculate way;Carries on description and ysis to the establishment that imitates true model, and to the transformer internal breakdown and exterior happens to break down bad move after the action of the electric appliances of characteristic and transformer two side electric current wave the form carry on ysis;Particularly yzed exterior in the meantime breakdown the Li Ci flow out to flow to bad move protective influence, and carry on a mistake to move process to imitate true ysis.Pass meticulous of imitate true should imitate a true possibility to confirming with detailed ysis.