220 kilovolt transformer substation main transformer N-1 check analysis method and system

The invention discloses an N-1 check analysis method for a main transformer of a 220kV transformer substation. The N-1 check analysis method comprises the following steps: acquiring data information of the 220kV transformer substation to be analyzed; constructing a load non-transferable ratio index; checking the limit transmission capacity of the line; calculating a load non-transferable ratio when the residual transformer is not overloaded under the N-1 condition of the main transformer of the transformer substation; calculating 110 kilovolt loads which cannot be transferred, and analyzing to obtain a final non-transferable load ratio of the transformer substation; and calculating to obtain the overload time duration of the residual transformer under the condition that the line cannot meet the load transfer demand when the load is increased and the non-transferable load causes the N-1 of the main transformer of the transformer substation, and completing check analysis. According to the method, rapid analysis