A method and system for rapidly judging axial stability of a transformer winding under external short circuit

Abstract

A power transformer external short-circuit winding axial stability rapid judgment method, system, medium and equipment. In the method, a power transformer winding axial vibration calculation model is established; by changing the short-circuit current amplitude, the characteristic value of the stress-strain curve of the cushion block and the pre-tightening force, the critical condition of the separation of the line pie and the cushion block of the winding is obtained, and the three-dimensional atlas of the critical state of the vibration separation of the line pie-cushion block is drawn. An axial stability analysis system of the power transformer under the external short-circuit impact in the running state is constructed, the above method corresponding calculation instruction is run by the local deployment computer, the short-circuit current peak value is extracted according to the current recording wave graph under the external short-circuit fault of the power transformer, and the fault point is determined in the three-dimensional atlas according to the actual pre-tightening force of the winding and the stress-strain curve of the cushion block. According to the relative relationship between the fault point and the critical state interface, the axial stability of the external short-circuit winding is rapidly judged.

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