Transformer winding structure inductance calculation method

Abstract

The invention provides a transformer winding structure inductance calculation method. The method is characterized by comprising the steps: based on winding inductance calculation of an energy perturbation finite element method and based on winding inductance analytical calculation of a transformer nameplate parameter, by modeling and solving an electrical transformer three-dimensional finite element magnetic field, simulating magnetic field distribution in a transformer, and fully considering the influence of a change of the magnetic field on an internal structure parameter of the transformer, especially a magnetic field change caused by an energy change in a winding structure, thereby calculating winding inductance. The method has broad adaptability to materials, boundaries and excitation, is convenient for treating a complex closed field magnetic field in which a plurality of mediums coexists, is helpful for transformer winding parameter identification and fault diagnosis, is quick and accurate in calculation and high in adaptability, and has relatively high engineering value.

Description

technical field [0001] The invention is a method for calculating the inductance of a winding structure of a transformer, which is applied to the stability evaluation of the winding structure of a power transformer and the analysis of power frequency electromagnetic compatibility problems. Background technique [0002] The power transformer is one of the very important and expensive equipment in the power system. The operation status of its winding not only affects its own safety, but also affects the stability and reliability of the entire power system operation. With the rapid development of my country's power grid and the continuous increase of transformer capacity, the winding vibration and magnetic flux leakage effect of large transformers are also significantly intensified when short-circuited. A series of unfavorable problems such as huge electric power, the consequences caused by the failure of power transformer windings will be more serious. Therefore, improving the ...

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Problems solved by technology

At present, the commonly used methods for studying transformer leakage magnetic field and winding inductance mainly include analytical method and experimental method. Due to the neglect of many factors and the establishment of many assumptions, these methods can only be applied to relatively special situations, so the results will be larger than the actual ones. The error is not accurate for the distribution of the actual transformer leakage field

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