Transformer winding short circuit fault damage point locating method

Abstract

The invention belongs to the technical field of electric power and relates to a transformer winding short circuit fault damage point locating method. The method includes the following steps that: step1, the three-dimensional field-circuit coupled electromagnetic field mathematical model of a transformer is established, and the voltage constraint condition of a short-circuit process is a directlyintroduced, and an electromagnetic field and short-circuit current are solved simultaneously; step 2, the axial vibration and radial stability of the winding of the transformer are analyzed; and step3, a branching type unstability theory is introduced to establish the finite element calibration model of the transformer, and the buckling modality of the coil of the winding under a radial limit load force and different short-circuit load forces can be obtained through buckling analysis with the effects of struts and spacers considered, so that the short-circuit fault damage point of the transformer can be found out. With the method of the invention adopted, the calculated limit load of the winding is closer to an actual working condition under the condition that the effects of the struts and spacers are fully considered, and the damage degree and deformation displacement of the winding can be effectively judged, and the specific damage fault location of the winding can be determined.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method for locating a transformer winding short-circuit fault damage point. Background technique [0002] With the rapid growth of the national economy and the accelerated construction of the domestic power grid, the capacity of the power grid has also increased rapidly. As one of the most core electrical equipment in the power system, the transformer has an irreplaceable position for power conversion. Problems, large-scale power outages, equipment stoppages, etc. will cause irreparable losses, and seriously affect people's normal work and life. [0003] The problem of short-circuit faults has always been a hot research field for experts and scholars in the transformer industry. However, due to the complex dynamic change process of the force in the short-circuit state of the transformer and many factors to be considered, the short-circuit aspect is still in the school o...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for locating the damaged point of a transformer winding short-circuit fault, which solves the problem that the limit load of the winding short-circuit cannot be accurately calculated before, and at the same time makes the calculated winding The ultimate load is closer to the actual working conditions, and can effectively judge the degree of winding damage and deformation displacement, and determine the specific location of the winding damage fault

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