Magnetic-structural-coupling-field-based transformer winding deformation analysis method

Abstract

The invention relates to a magnetic-structural-coupling-field-based transformer winding deformation analysis method. According to the technical scheme, the method comprises the following steps: a transformer magnetic-structural coupling model containing an electromagnetic field model and a structural field model is established and attributes and constraint conditions of the electromagnetic field model and the structural field model are set; a current is loaded on the electromagnetic field model to obtain an analysis result of an electromagnetic field Lorentz force; the analysis result of the electromagnetic field Lorentz force is extracted and is loaded on the structural model as an electromagnetic field load, and deformation of the transformer winding and the stress strength are observed, thereby realizing the analysis of the transformer deformation. According to the invention, a magnetic-structural-coupling finite element analysis method is applied to the transformer winding deformation analysis and thus the analysis on the transformer winding deformation state is realized under the circumstances that no power failure occurs and no cover suspending needs to be carried out, so that work of field testing and cover suspension examination and the like can be avoided. On the premise that the analysis accuracy is guaranteed, the work load is reduced and the operation and maintenance costs are saved.

Description

technical field [0001] The invention belongs to the technical field of transformers, in particular to a transformer winding deformation analysis method based on a magnetic-structure coupling field. Background technique [0002] In recent years, short-circuit faults at the outlet of transformers have occurred frequently, seriously affecting the safe and stable operation of the power system. Statistics show that more than 70% of the causes of transformer damage are due to the deformation of the low-voltage winding caused by the short circuit at the transformer outlet. Therefore, it is of great significance to accurately analyze the transformer winding deformation problem and take effective measures to improve the winding strength to ensure the safe and stable operation of the transformer. [0003] At present, the analysis of transformer winding deformation mainly relies on on-site winding deformation test, but this method requires the equipment to be powered off, and whether ...

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Problems solved by technology

[0003] At present, the analysis of transformer winding deformation mainly relies on the on-site winding deformation test, but this method needs to cut off the power of the equipment, and whether the deformation test is carried out by the frequency response method or the reactance method, the test process takes a long time and requires a lot of manpower

Especially in the condition-based maintenance mode, the power failure cycle of the transformer is determined by the equipment status, and some transformers even have a power failure once every 5-6 years. In such a state, it is obviously difficult to judge the deformation of the transformer winding in time by completely relying on the means of power failure test.

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