CN-115526079-B - Step-by-step equivalent transformer vibration noise simulation method

CN115526079BCN 115526079 BCN115526079 BCN 115526079BCN-115526079-B

Abstract

The invention discloses a step-by-step equivalent transformer vibration noise simulation method which comprises the steps of constructing a three-dimensional model of an iron core according to magnetostriction condition simulation of the iron core and actual form of the iron core, obtaining deformation simulation results of the iron core under the influence of magnetostriction effect in the three-dimensional model of the iron core, constructing two-dimensional models of an oil tank, the iron core and a winding, obtaining vibration simulation results of the winding and sound field distribution simulation results near the winding under the vibration condition of the winding, integrating the three-dimensional model of the iron core and the two-dimensional model of the winding, adding other parts to obtain a reconstructed three-dimensional model, and calculating in the reconstructed three-dimensional model to obtain the vibration noise simulation condition of the transformer. The invention solves the problem of mutual coupling among models with different dimensions, realizes more simulation details, achieves higher simulation precision level, and realizes quick and accurate simulation of the vibration noise of the transformer.

Inventors

XIE LUJIA
LI FENG
SU ZHONGHUAN
LUO HU
Xi ru
QU GUANGLEI
ZHANG CHENG
ZHANG FAN
JI SHENGCHANG

Assignees

特变电工科技投资有限公司
特变电工股份有限公司
西安交通大学
特变电工衡阳变压器有限公司
特变电工沈阳变压器集团有限公司
特变电工股份有限公司新疆变压器厂

Dates

Publication Date: 20260505
Application Date: 20220930

Claims (8)

1. The method is characterized in that the transformer is arranged in an oil tank, and comprises an iron core, a winding wound on the iron core and a clamping piece clamped on the winding, and the method comprises the following steps: constructing a three-dimensional model of the iron core, and calculating the magnetostriction condition of the iron core under the influence of a magnetic field to obtain a deformation simulation result of the iron core under the influence of a magnetostriction effect; Constructing a two-dimensional model of the winding, and simulating the vibration condition of the winding to obtain a vibration simulation result of the winding; performing complete modeling on the iron core, the winding, the clamping piece and the oil tank in the three-dimensional model of the iron core to obtain a three-dimensional model to be integrated; obtaining boundary conditions of the winding according to the vibration simulation result of the winding; replacing a region of the winding, where the position of the winding in the actual situation corresponds to the three-dimensional model to be integrated, according to the boundary condition of the winding to obtain a reconstructed three-dimensional model; the method comprises the steps of carrying out sound field simulation on a reconstructed three-dimensional model to obtain a sound field simulation result of the reconstructed three-dimensional model, and combining a deformation simulation result of the iron core under the influence of a magnetostriction effect and the sound field simulation result to obtain a first sound field simulation quantity; Combining the vibration simulation result of the winding and the sound field simulation result to obtain a second sound field simulation quantity; Combining the first sound field simulation quantity and the second sound field simulation quantity to obtain a complete sound field simulation calculation model; And obtaining the vibration noise simulation condition of the transformer according to the complete sound field simulation calculation model.
2. The method for simulating vibration noise of a step-by-step equivalent transformer according to claim 1, wherein the steps of constructing a three-dimensional model of the iron core, calculating magnetostriction conditions of the iron core under the influence of a magnetic field, and obtaining deformation simulation results of the iron core under the influence of magnetostriction effects comprise: Constructing a three-dimensional model of the iron core according to the actual forms of the winding and the iron core, wherein the winding is in a cylindrical structure in the three-dimensional model of the iron core; constructing a magnetostrictive model of the core based on the core of soft iron material in a three-dimensional model of the core; Calculating the magnetic field distribution generated by the winding and the magnetostriction condition of the iron core under the influence of the magnetic field to obtain a deformation simulation result of the iron core under the influence of the magnetostriction effect; Correcting interpolation data of a magnetization curve and an effective magnetization curve of a magnetostrictive model of the iron core according to the magnetization curve of the soft iron material, and setting a first attribute condition in the magnetostrictive model of the iron core; and calculating the magnetostriction model of the iron core according to the first attribute condition to obtain a deformation simulation result of the iron core under the influence of the magnetostriction effect.
3. The step-equivalent transformer vibration noise simulation method according to claim 2, wherein the step of constructing a magnetostrictive model of the core based on the core of soft iron material in the three-dimensional model of the core comprises: Setting a first constraint condition in the three-dimensional model constructed based on the iron core of the soft iron material, wherein the first constraint condition comprises the application of ampere law conditions to the iron core affected by magnetostriction, the addition of three-phase windings as domain coils, and the selection of winding sections in geometric analysis and the consistent definition direction; Setting the iron core in the three-dimensional model as a domain to be solved according to the first constraint condition; Setting a second constraint condition in the to-be-solved domain, and obtaining a solving result according to the second constraint condition, wherein the second constraint condition comprises that a solid model is changed into orthotropic in an online elastic material domain condition, and a magnetostrictive model is changed into nonlinear isotropy in a magnetostrictive domain condition; and obtaining the magnetostriction model of the iron core according to the solving result.
4. The step-by-step equivalent transformer vibration noise simulation method according to claim 1, wherein the steps of constructing a two-dimensional model of the winding and simulating the vibration condition of the winding to obtain the vibration simulation result of the winding comprise: Constructing a two-dimensional model of the winding according to the actual form of the winding; And constructing a two-dimensional model of the oil tank, the iron core and the cushion block in the two-dimensional model, and simulating the vibration condition of the winding to obtain a vibration simulation result of the winding.
5. The step-wise equivalent transformer vibration noise simulation method of claim 1, wherein the clamping piece is connected with a winding pressing plate; the step of obtaining a second sound field simulation amount by combining the vibration simulation result and the sound field simulation result comprises the following steps: obtaining the deformation condition of the winding end in the two-dimensional model of the winding; taking the deformation condition of the winding end part as a second constraint condition; And according to the second constraint condition, simulating in the reconstructed three-dimensional model to obtain the second sound field simulation quantity.
6. The step-wise equivalent transformer vibration noise simulation method of claim 1, wherein the vibration simulation results comprise sound field distribution simulation results; the step of obtaining a second sound field simulation amount by combining the vibration simulation result and the sound field simulation result comprises the following steps: in a two-dimensional model of the winding, simulating to obtain sound field distribution conditions near the winding under the vibration condition of the winding; Obtaining a sound field distribution result close to the winding according to the sound field distribution condition near the winding under the vibration condition of the winding; Taking the sound field distribution result of the winding as a third constraint condition; And according to the third constraint condition, simulating in the reconstructed three-dimensional model to obtain the second sound field simulation quantity.
7. The step-wise equivalent transformer vibration noise simulation method according to claim 1, wherein in the complete sound field simulation calculation model, the winding has a coupling portion; The step of obtaining the vibration noise simulation condition of the transformer according to the complete sound field simulation calculation model comprises the following steps: hiding the coupling part of the winding in the complete sound field simulation calculation model; and carrying out no-load simulation on the complete sound field simulation calculation model to obtain the vibration noise simulation condition of the transformer.
8. The step-by-step equivalent transformer vibration noise simulation method according to claim 1, wherein the step of obtaining the vibration noise simulation situation of the transformer according to the complete sound field simulation calculation model comprises: Setting a second attribute condition in the complete sound field simulation calculation model; and carrying out load simulation on the complete sound field simulation calculation model to obtain the vibration noise simulation condition of the transformer.

Description

Step-by-step equivalent transformer vibration noise simulation method Technical Field The invention relates to the technical field of transformer equipment, in particular to a step-by-step equivalent transformer vibration noise simulation method. Background In the related art, in the aspect of researching the inherent vibration characteristics of the iron core, a finite element simulation mode is adopted to simulate and analyze the whole iron core, so as to calculate the vibration mode of the iron core, however, the multi-layer lamination structure of the iron core enables the mechanical characteristics of the iron core to present remarkable anisotropism, and the inherent vibration frequency of the iron core in the bending direction is far greater than the actual frequency by using the integral iron core model for analysis, so that the actual vibration characteristics of the iron core cannot be reflected well. Moreover, the vibration characteristics of the silicon steel laminations under different lamination numbers are researched, the natural frequency of the vibration of the out-of-plane bending vibration of the silicon steel laminations is not changed basically along with the lamination number of the silicon steel laminations, the silicon steel lamination model established in the prior art can reflect the natural vibration characteristics under the lamination structure of the iron core, but the problems that the calculated amount is too large, the solution is difficult, the excessive simplification is realized, the simulation result and the actual difference are large are solved, and the practical reference value of engineering is small. Therefore, the existing transformer vibration noise simulation method has the technical problems that the calculated amount is too large, the solution and simplification are difficult to be excessive, the simulation result and the actual difference are large, and the reference value to engineering practice is small. Disclosure of Invention The invention mainly aims to provide a step-by-step equivalent transformer vibration noise simulation method, which aims to solve the technical problems that the calculated amount is too large, the calculation is difficult to solve and the transition is simplified, the simulation result and the actual difference are large, and the practical reference value of engineering is small in the prior art. In order to achieve the above purpose, the invention adopts the following technical scheme: the invention provides a step-by-step equivalent transformer vibration noise simulation method, wherein the transformer is arranged in an oil tank and comprises an iron core and a winding wound on the iron core, and the method comprises the following steps: constructing a three-dimensional model of the iron core, and calculating the magnetostriction condition of the iron core under the influence of a magnetic field to obtain a deformation simulation result of the iron core under the influence of a magnetostriction effect; Constructing a two-dimensional model of the winding, and simulating the vibration condition of the winding to obtain a vibration simulation result of the winding; and establishing a reconstruction three-dimensional model comprising the iron core, the clamping piece and the oil tank of the transformer, introducing a deformation simulation result of the iron core under the influence of a magnetostriction effect into sound field simulation, taking a vibration simulation result of the winding as a boundary condition, and calculating the vibration noise of the transformer under the three-dimensional condition. Optionally, in the step-by-step equivalent transformer vibration noise simulation method, the step of constructing a three-dimensional model of the iron core, and calculating magnetostriction conditions of the iron core under the influence of a magnetic field to obtain deformation simulation results of the iron core under the influence of the magnetostriction effect includes: Constructing a three-dimensional model of the iron core according to the actual forms of the winding and the iron core, wherein the winding is in a cylindrical structure in the three-dimensional model of the iron core; constructing a magnetostrictive model of the core based on the core of soft iron material in a three-dimensional model of the core; Calculating the magnetic field distribution generated by the winding and the magnetostriction condition of the iron core under the influence of the magnetic field to obtain a deformation simulation result of the iron core under the influence of the magnetostriction effect; Correcting interpolation data of a magnetization curve and an effective magnetization curve of a magnetostrictive model of the iron core according to the magnetization curve of the soft iron material, and setting a first attribute condition in the magnetostrictive model of the iron core; and calculating the magnetostriction model of the iron core ac