计及短路重合闸的电力变压器机械稳定性评估方法

doi:10.11896/jsjkx.240800082

Abstract

Abstract: With the expansion of power grid capacity and coverage,short-circuit faults at transformer outlets are becoming more and more frequent.In order to reduce the influence of not considering the secondary impact of reclosing on the anti-short-circuit check of power transformer,based on the fourth strength theory and the axial and radial instability criteria,a mechanical stability evaluation method of power transformer considering the influence of short-circuit reclosing is proposed.Firstly,the field-circuit coupling method is used to simulate the short-circuit reclosing condition,and the current size,magnetic flux leakage distribution and electromagnetic force density of the transformer winding during the short-circuit process are calculated.On this basis,the two-dimensional axisymmetric simplification of the finite element model is carried out,and the high-order polynomial fitting is used to construct a surrogate model for the rapid prediction of the magnetic flux leakage density of the transformer winding,so as to improve the calculation efficiency of the performance check of the power transformer under short-circuit conditions,and provide a new way for the rapid evaluation of the short-circuit resistance of the transformer.Then,the displacement and residual deformation of the winding under the action of von Mises stress and short-circuit electrodynamic force are analyzed by electromagnetic-structural field sequential coupling.Finally,the mechanical stability of transformer under short-circuit electromagnetic load is checked by combining the minimum yield failure coefficient and multi-dimensional structural instability criterion,and the construction scheme of dynamic stability evaluation and early warning system of in-service transformer based on cloud-edge coordination is expounded.The implementation of this evaluation method effectively improves the accuracy of transformer winding stability check,and provides scientific support for transformer maintenance and fault prevention.

Key words: Power transformer, Short-circuit reclosing, Finite element analysis, Field-circuit coupling, Mechanical stability, Cloud edge collaboration

CLC Number:

TM411

HAO Yuefeng, LIU Jun, XU Kui, XU Shurong, SHI Lintao, LU Yuchu. Mechanical Stability Evaluation Method of Power Transformer Considering Short-circuit Reclosing[J].Computer Science, 2025, 52(11A): 240800082-11.

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Mechanical Stability Evaluation Method of Power Transformer Considering Short-circuit Reclosing

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