CN115235604A - Method and device for testing sound vibration level of iron core of transformer and electronic equipment - Google Patents
Method and device for testing sound vibration level of iron core of transformer and electronic equipment Download PDFInfo
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Abstract
The invention provides a method and a device for testing the sound vibration level of an iron core of a transformer and electronic equipment, wherein the method comprises the following steps: obtaining an equivalent model of the transformer to be tested based on a preset standard; acquiring the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared with the equivalent model; obtaining vibration levels and noise levels of different positions of an iron core of the equivalent model; and determining the sound vibration level of the iron core of the transformer to be tested based on the noise level amplification ratio, the vibration level and the noise level. The invention designs an equivalent model of the actual transformer, effectively reflects the noise vibration data of the actual transformer, can directly load the working condition of the test on the transformer core without injecting oil, is convenient to directly carry out the noise vibration test of the core, provides an effective test scheme for the sound vibration characteristic analysis of the core of the high-voltage class transformer, and avoids the defects of the conventional test technology in the aspects of insulation design, installation and the like.
Description
Technical Field
The embodiment of the invention relates to the technical field of sound vibration testing of power equipment, in particular to a sound vibration level testing method and device of an iron core of a transformer and electronic equipment.
Background
With the development of economic society, the demand for electricity of residents and industrial enterprises is increasing, and the scale of the amount of the power transformer used as an important device of a power transmission network is also expanding. However, with the continuous increase of the scale of the power grid and the shortage of urban land resources, more and more transformer stations are located deep into the urban center. In order to reduce the influence on the surrounding sound environment, the noise vibration level of the transformer has become one of the important indexes of product factory inspection, and the vibration and noise characteristics, the generation mechanism, the propagation rule and the like of the transformer have become research hotspots in related fields.
The existing research shows that the noise vibration of the transformer is derived from the vibration caused by the magnetostriction of the iron core lamination under the alternating current working condition, and the vibration is transmitted to the oil tank through the iron core foot pad and the transformer oil to form a secondary vibration source. Thus, the core acoustic vibration level directly determines the overall noise level of the transformer. However, the iron core is located inside the oil tank and is in a high-temperature, oil-immersed and charged state during working, so that direct acoustic vibration testing is difficult to perform, and the existing research is generally focused on aspects such as iron core silicon steel material testing, simulation calculation and the like. The existing noise vibration testing technology generally aims at the whole product with an oil tank, and the testing result cannot directly reflect the noise vibration level of the iron core due to the obstruction of insulating oil and the oil tank.
Disclosure of Invention
In order to solve the technical problem, the invention provides a method, equipment and electronic equipment for testing the sound vibration level of the iron core of the transformer, and the noise level and vibration data of the iron core of the transformer are obtained by combining equivalent model building, simulation and test.
In a first aspect, the present invention provides a method for testing a sound vibration level of an iron core of a transformer, the method comprising:
obtaining an equivalent model of the transformer to be tested based on a preset standard;
acquiring the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared with the equivalent model;
obtaining vibration levels and noise levels of different positions of an iron core of the equivalent model;
and determining the sound vibration level of the iron core of the transformer to be tested based on the noise level amplification ratio, the vibration level and the noise level.
In a possible implementation manner, the obtaining an equivalent model of the to-be-measured transformer based on the preset standard specifically includes:
and aiming at the iron core material, the winding material and the structural characteristics of the transformer to be tested, obtaining an equivalent model of the transformer to be tested based on the principles of magnetic field equivalence, material equivalence and structural equivalence.
In one possible implementation manner, the core material and the winding material of the equivalent model are the same as those of the transformer to be tested.
In one possible implementation manner, the core size of the equivalent model is designed according to a ratio of 1.
In a possible implementation manner, the obtaining of the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared with the equivalent model specifically includes:
and establishing the equivalent model and a multi-physical-field coupling simulation model of the iron core of the transformer to be tested, and respectively obtaining the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared with the equivalent model under the same iron core magnetic flux density.
In a possible implementation manner, the obtaining of the vibration level and the noise level of the iron core of the equivalent model at different positions specifically includes:
on the premise of no oil tank installation and oil injection, voltage or current excitation is applied to the equivalent model, vibration levels at different positions are obtained by adopting an accelerometer test, and the noise level of the iron core is obtained by adopting a sound level meter test.
In a possible implementation manner, the determining, based on the noise level amplification ratio, the vibration level, and the noise level, a sound vibration level of the iron core of the transformer to be tested specifically includes:
multiplying the noise level by the noise level amplification ratio to obtain the noise level of the iron core of the transformer to be tested;
and multiplying the vibration level by the vibration level amplification ratio to obtain the vibration level of the iron core of the transformer to be tested.
In a second aspect, the present invention provides an apparatus for testing a level of acoustic vibration of an iron core of a transformer, the apparatus comprising:
the equivalent model module is used for obtaining an equivalent model of the transformer to be tested based on a preset standard;
the amplification ratio module is used for acquiring the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared with the equivalent model;
the acquisition module is used for acquiring the vibration level and the noise level of different positions of the iron core of the equivalent model;
and the sound vibration level module is used for determining the sound vibration level of the iron core of the transformer to be tested based on the noise level amplification ratio, the vibration level and the noise level.
In a third aspect, the present invention provides an electronic device, where the electronic device bears the resource scheduling system, and includes a processor, a communication interface, a memory, and a communication bus, where the processor, the communication interface, and the memory complete mutual communication through the communication bus;
a memory for storing a computer program;
a processor for implementing the steps of the method for testing the sound vibration level of the iron core of the transformer according to any one of the embodiments of the first aspect when executing the program stored in the memory.
In a fourth aspect, the present invention provides a computer-readable storage medium having stored thereon a computer program which, when being executed by a processor, carries out the steps of the method for testing a sound vibration level of a core of a transformer as defined in any of the embodiments of the first aspect.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
the method provided by the embodiment of the application obtains the equivalent model of the transformer to be tested based on the preset standard. And acquiring the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared with the equivalent model. And obtaining the vibration level and the noise level of the iron core of the equivalent model at different positions. And determining the sound vibration level of the iron core of the transformer to be tested based on the noise level amplification ratio, the vibration level and the noise level. According to the method, an equivalent model of an actual transformer is designed through a preset standard, noise vibration data of the actual transformer are effectively reflected, the working condition of a test can be directly loaded on a transformer core under the condition of no oil injection, the core noise vibration test is conveniently and directly carried out, then the sound vibration test result of the equivalent model is converted into the sound vibration data of an actual transformer product, risks such as insulation safety and the like caused by arranging sensors in an oil tank of the actual transformer are avoided, an effective test scheme is provided for the core sound vibration characteristic analysis of the high-voltage-level transformer by the technical scheme, and the defects of a conventional test technology in the aspects of insulation design, installation and the like are avoided.
Drawings
Fig. 1 is a schematic flow chart of a method for testing a sound vibration level of an iron core of a transformer according to an embodiment of the present invention;
FIG. 2 is a simulation diagram of the core flux density of the scaled equivalent model in example 1;
FIG. 3 is a simulation diagram of the core flux density of the transformer to be tested in example 1;
FIG. 4 is a schematic diagram of a core structure of a scaled equivalent model;
FIG. 5 isbase:Sub>A cross-sectional view A-A of FIG. 4;
FIG. 6 is a diagram showing the simulation of core vibration of the scaled equivalent model in example 1;
fig. 7 is a simulation diagram of the core vibration of the transformer to be measured in embodiment 1;
FIG. 8 is a simulation diagram of core noise of the scaled equivalent model in example 1;
fig. 9 is a simulation diagram of core noise of the transformer to be tested in embodiment 1;
FIG. 10 is a schematic diagram of a scaled equivalent model noise test;
fig. 11 is a schematic structural diagram of a device for testing a sound vibration level of an iron core of a transformer according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Reference numerals: 1-laminated core structure, 2-fiber accelerometer, 3-polyester tape.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
For the convenience of understanding of the embodiments of the present invention, the following description will be further explained with reference to specific embodiments, which are not to be construed as limiting the embodiments of the present invention.
In order to solve the defects of the prior art, the present invention provides a method for testing a sound vibration level of an iron core of a transformer, specifically referring to fig. 1, where fig. 1 is a schematic flow chart of a method for testing a sound vibration level of an iron core of a transformer according to an embodiment of the present invention, and as shown in fig. 1, the method includes the following steps:
and 110, obtaining an equivalent model of the transformer to be tested based on a preset standard.
Specifically, noise of the transformer is mainly generated by the iron core, and the selection of the magnetic density of the iron core is important for influencing the noise of the transformer. In one example, an equivalent model of the transformer to be tested is obtained based on the principles of magnetic field equivalence, material equivalence and structure equivalence for the core material, the winding material and the structural characteristics of the transformer to be tested. And obtaining a transformer equivalent model through the magnetic field, structure and material equivalent principle, wherein the model can effectively reflect the noise vibration data of an actual transformer product.
In another example, the core material and the winding material of the equivalent model are the same as those of the transformer to be tested.
In another example, the equivalent model obtained by the present application is a scaled equivalent model, and since the noise level of the transformer is mainly affected by the capacity and the size under the condition that the structure, the operation condition and the process level are consistent, the noise of the transformer with larger capacity and larger size is higher. Therefore, in designing the scaling model, it is important to select an appropriate scaling. If the scaling model is too small, it will result in lower noise, which is detrimental to the test testing, while if it is too large, it will exceed the power supply capability in the test station. After the noise level of the scaling model and the limitation of the test capability are comprehensively considered, the iron core size of the equivalent model is designed according to the scaling ratio of 1.
In another example, the size of the winding of the equivalent model is not reduced in proportion, the magnetic density level of the iron core is obtained by establishing an iron core magnetic field simulation analysis model of the transformer to be measured under a rated working condition, and the size, the number of turns, the rated current and the voltage parameters of the winding of the equivalent model of the transformer are adjusted accordingly, so that the magnetic density level of the iron core is consistent with that of the transformer to be measured.
And step 120, acquiring the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared with the equivalent model.
In one example, an equivalent model and a multi-physics field coupling simulation model of an iron core of a transformer to be tested are established, and under the same iron core magnetic flux density, the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared with the equivalent model are respectively obtained. Wherein, the coupled simulation model of many physics includes: electromagnetic, vibration and noise simulation model.
Specifically, the electromagnetic, vibration and noise simulation model calculates and obtains the vibration level of the iron core column and the iron yoke of the transformer to be tested and the equivalent model under a specific working condition, and the noise level of the envelope surface at a position 0.3m away from the surface of the iron core, and further calculates and obtains the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared with the equivalent model.
By adopting a simulation analysis technology, the sound vibration level proportional coefficient of the equivalent model and the transformer to be tested under the working condition of the same proportion is calculated, and then the sound vibration test result of the equivalent model is converted into sound vibration data of an actual product through proportion conversion, so that the risks of insulation safety and the like caused by arranging sensors in an actual transformer oil tank are avoided.
And step 130, obtaining the vibration level and the noise level of the iron core of the equivalent model at different positions.
In one example, voltage or current excitation is applied to the equivalent model on the premise of not installing a fuel tank and injecting fuel, vibration levels at different positions are obtained by adopting an accelerometer test, and the noise level of the iron core is obtained by adopting a sound level meter test. Specifically, a sound level meter is arranged on an envelope surface at a position 0.3m away from the surface of the iron core, and the noise level is measured. The equivalent model designed by the invention is convenient to assemble and disassemble, has lower voltage grade, can directly load the working condition of the test on the transformer core under the condition of not injecting oil, and is convenient to directly carry out the vibration test of the noise of the core.
In one example, the accelerometer is a fiber optic accelerometer or a laser vibrometer.
If the optical fiber accelerometer is used, the optical fiber accelerometer is bound and fixed on the iron yoke and the iron core column through the polyester tape, an insulating paper board is arranged between the sensor and the iron yoke and the iron core column in a padded mode, and meanwhile the binding tape is retracted to ensure that the sensor and the insulating paper board are tightly attached. If the vibration measuring instrument is a laser vibration meter, the vibration measuring instrument directly irradiates to the measuring point position through a laser signal to carry out vibration measurement. Vibration testing is carried out through the optical fiber accelerometer or the non-contact laser vibration meter after insulation treatment, and the electrical safety of the measuring equipment is guaranteed.
And step 140, determining the sound vibration level of the iron core of the transformer to be tested based on the noise level amplification ratio, the vibration level and the noise level.
Specifically, multiplying the noise level by the noise level amplification ratio to obtain the noise level of the iron core of the transformer to be tested; and multiplying the vibration level by the vibration level amplification ratio to obtain the vibration level of the iron core of the transformer to be tested.
According to the method, the equivalent model of the transformer to be tested is obtained based on the preset standard. And acquiring the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared with the equivalent model. And obtaining the vibration level and the noise level of the iron core of the equivalent model at different positions. And determining the sound vibration level of the iron core of the transformer to be tested based on the noise level amplification ratio, the vibration level and the noise level. According to the method, an equivalent model of an actual transformer is designed through a preset standard, noise vibration data of the actual transformer are effectively reflected, the working condition of a test can be directly loaded on a transformer core under the condition of no oil injection, the core noise vibration test is conveniently and directly carried out, then the sound vibration test result of the equivalent model is converted into the sound vibration data of an actual transformer product, risks such as insulation safety and the like caused by arranging sensors in an oil tank of the actual transformer are avoided, an effective test scheme is provided for the core sound vibration characteristic analysis of the high-voltage-level transformer by the technical scheme, and the defects of a conventional test technology in the aspects of insulation design, installation and the like are avoided.
According to the above-described method for testing the level of the acoustic vibration of the iron core of the transformer, the following detailed description is made in specific embodiments 1 and 2, respectively:
example 1
A110 kV50MVA transformer product produced by a certain equipment factory is to be put into operation for use, and the actual transformer is used as a transformer to be tested. In order to master the noise and vibration characteristics of the iron core, the following scheme is adopted for testing:
(1) And obtaining an equivalent model of the transformer to be tested based on a preset standard.
Aiming at the material and structural characteristics of the iron core and the winding of the transformer, a transformer equivalent model is designed and manufactured by adopting the principles of magnetic field equivalence, structural equivalence and material equivalence.
The noise level of the equivalent model and the limit of the test capability are comprehensively considered, the item is reduced according to the proportion of 1. The specific design parameters of the scaling equivalent model are as follows:
(1) capacity, voltage and connection group
Phase number: phase 3
Rated capacity: 800kVA
Rated voltage: 10kV
And (3) connecting and grouping: YNd11
(2) Iron core material and structure
Silicon steel sheet number: B30P105
Core form: three-phase three-column inclined joint
Magnetic density of the iron core: 1.748T
Number of iron core stages: 15
Overlapping length: 18mm
(3) Winding structure
The design is done according to the capacity voltage class, without scaling down. High voltage winding turns 425 and low voltage winding turns 28. The winding height is 330mm, the inner diameter is 340mm, and the outer diameter is 430mm.
(4) Oil tank structure
The oil tank form is as follows: bell jar type
The overall dimension of the oil tank is as follows: is scaled down
Thickness of the oil tank: according to the practical situation, the method is selected according to the proportion of 1
(5) Fuel tank assembly
The sizes of oil tank components such as an oil conservator, a sleeve and a plate radiator can be adjusted according to actual conditions, and the proportion of 1.
The noise of the transformer is mainly generated by the iron core, and the selection of the magnetic density of the iron core is important to influence the noise of the transformer. Therefore, the iron core structure of the scaling equivalent model is consistent with that of the 110kV transformer to be tested, and the iron core magnetic density of the scaling equivalent model is also consistent with that of the 110kV transformer to be tested. Therefore, a scaling model and a no-load iron core magnetic field of the 110kV transformer to be tested are subjected to simulation analysis by adopting MagNet electromagnetic simulation software, and the average magnetic density of the iron core is investigated. Fig. 2 and fig. 3 respectively show the comparison between the compression ratio equivalent model under the rated voltage and the magnetic field distribution on the surface of the iron core of the transformer to be tested with the rated voltage and the magnetic flux density distribution of the center of the iron core along the axial section. The following table shows the comparison value of the scaling equivalent model and the average magnetic density of the core limb of the 110kV transformer to be tested.
TABLE 1 comparison value between equivalent scaled model and average magnetic flux density of iron core of 50MVA/110kV transformer to be tested
| Model (model) | Average magnetic density of core column (T) | Average magnetic density of yoke (T) |
| Scaling model | 1.745 | 1.751 |
| 110kV product | 1.741 | 1.748 |
| Error of the measurement | 0.23％ | 0.17％ |
The general structure of the scaled equivalent model is shown in fig. 4.
Considering that the winding noise is not obvious in the actual 50MVA/110kV transformer to be tested, the design of the winding of the scale equivalent model is simplified, namely the winding is electrically designed according to the size, the capacity, the voltage level and the like of the iron core of the scale equivalent model, and is not designed according to the proportion and the structure. The finally prepared scaling equivalent model is a 10kV800kVA capacity product.
(2) And determining the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared with the equivalent model.
And establishing a scaling equivalent model and an iron core multi-physical field coupling simulation model of the transformer to be tested, and respectively calculating the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared with the equivalent model under the same iron core magnetic flux density.
Adopting finite element simulation software, firstly establishing a scaling equivalent model and a geometric model of the transformer to be measured according to parameters such as the size of an iron core; and then, defining the material property of the model according to parameters such as the H-B curve, young modulus, poisson ratio, density, relative dielectric constant and the like of the silicon steel sheet obtained by query, and setting a fixed constraint boundary condition aiming at the position of the iron core foot pad. Meanwhile, the iron core and the air domain are defined by adopting a circuit-magnetic field-solid mechanics-acoustic multi-physical field coupling module. Setting a rated voltage working condition on the winding, and after the grid division is completed, performing structural mechanics and acoustic calculation to obtain simulation analysis results of the scale equivalent model and the vibration field and the sound field of the transformer to be tested, as shown in fig. 6 to 9. According to the simulation result in the figure, the vibration acceleration ratio of the to-be-tested transformer model to the scaling equivalent model is 1.7; and taking a noise measuring point at 0.3m, wherein the sound pressure level ratio of the transformer model to be measured to the scaling equivalent model is 1.18.
(3) And obtaining the vibration level and the noise level of the iron core of the equivalent model at different positions.
On the premise of no oil tank installation and oil injection, voltage or current excitation is applied to the scaling equivalent model, vibration levels at different positions are obtained by adopting an accelerometer test, and the iron core noise level is obtained by adopting a sound level meter test.
According to the installation scheme in fig. 4, 8 optical fiber acceleration sensors are respectively fixed on the iron yoke and the iron core column, an insulating paper board is arranged between the sensor and the iron yoke and between the sensor and the iron core column in a padding mode, and meanwhile, the binding belt is retracted to ensure that the sensor and the insulating paper board are tightly attached. A nominal working condition was applied to the iron core model, and a noise test was performed on an envelope surface at a distance of 0.3m from the surface of the model using a sound level meter, as shown in fig. 10. The final test results are shown in the table below.
TABLE 2 iron core surface vibration test results
| Test point number | Position of | Measured value (m/s) 2 ) |
| 1 | Left side of upper part of iron core | 0.45 |
| 2 | Middle of iron core | 0.32 |
| 3 | Right side of the upper part of the iron core | 0.58 |
| 4 | Left side of the middle part of the iron core | 0.37 |
| 5 | Middle part of the iron core | 0.27 |
| 6 | Right side of the middle part of the iron core | 0.36 |
| 7 | Left side of iron core bottom | 0.17 |
| 8 | Middle of iron core bottom | 0.21 |
| 9 | Right side of iron core bottom | 0.23 |
TABLE 3 core noise test results
| Measurement point number | Measured value (dB) |
| 1 | 50 |
| 2 | 49 |
| 3 | 51 |
| 4 | 49 |
(3) And determining the sound vibration level of the iron core of the transformer to be tested based on the noise level amplification ratio, the vibration level and the noise level.
And multiplying the noise level by the noise level amplification ratio to obtain the noise level of the iron core of the transformer to be tested, and multiplying the vibration level by the vibration level amplification ratio to obtain the vibration level of the iron core of the transformer to be tested, namely the sound vibration level of the transformer to be tested.
The data in table 2 is multiplied by the vibration level amplification ratio 1.7, and the data in table 3 is multiplied by the noise level amplification ratio 1.18, which is the noise vibration data of the core of the actual transformer.
Example 2
A220 kV50MVA transformer product produced by a certain equipment factory is to be put into operation for use, and the actual transformer is used as a transformer to be tested. In order to master the noise and vibration characteristics of the iron core, the following scheme is adopted for testing:
(1) And obtaining an equivalent model of the transformer to be tested based on a preset standard.
Aiming at the material and structural characteristics of the iron core and the winding of the transformer, a transformer equivalent model is designed and manufactured by adopting the principles of magnetic field equivalence, structural equivalence and material equivalence
After the noise level of the equivalent model and the limitation of the test capability are comprehensively considered, the item is reduced according to the proportion of 1. The specific design parameters of the scaling equivalent model are as follows:
(1) capacity, voltage and connection group
Phase number: 3 phase (C)
Rated capacity: 3150kVA
Rated voltage: 35kV
And (3) connecting and grouping: YNd11
(2) Iron core material and structure
Silicon steel sheet mark: B30P105
Core form: three-phase three-column inclined joint
Magnetic density of the iron core: 1.7832T
(3) Winding structure
The design is done according to the capacity voltage class, without scaling down.
(4) Oil tank structure
The oil tank form is as follows: bell jar type
The overall dimension of the oil tank is as follows: is scaled down
Thickness of the oil tank: according to the practical situation, the method is characterized in that the method is selected according to the proportion of 1
(5) Fuel tank assembly
The sizes of the oil tank assemblies such as the oil conservator, the sleeve, the plate bulk and the like can be adjusted according to actual conditions, and the proportion of 1.
In order to ensure that the equivalent model of the transformer is consistent with the magnetic density of a transformer product, the size of a coil winding, the current and the like of the model are set, so that the average magnetic flux density is about 1.78T. The final rated current was set at 70A, height 350mm, coil inner diameter 370mm, outer diameter 450mm. High voltage winding turns 440 and low voltage winding turns 30.
(2) And determining the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared with the equivalent model.
And establishing a scaling equivalent model and an iron core multi-physical field coupling simulation model of the transformer to be tested, and respectively calculating and obtaining the noise and vibration horizontal amplification ratio of the transformer to be tested compared with the equivalent model under the same iron core magnetic flux density.
Adopting finite element simulation software, firstly establishing a scaling equivalent model and a geometric model of the transformer to be measured according to parameters such as the size of an iron core; and then, defining the material property of the model according to parameters such as the H-B curve, young modulus, poisson ratio, density, relative dielectric constant and the like of the silicon steel sheet obtained by query, and setting a fixed constraint boundary condition aiming at the position of the iron core foot pad. Meanwhile, the iron core and the air domain are defined by adopting a circuit-magnetic field-solid mechanics-acoustic multi-physical field coupling module. And setting a rated voltage working condition on the winding, and after the grid division is completed, performing structural mechanics and acoustic calculation to obtain a simulation analysis result of the scaling equivalent model and the vibration field and the sound field of the transformer to be tested. According to the simulation result in the figure, the vibration acceleration ratio of the to-be-measured transformer model to the scaling equivalent model is 1.4; and taking a noise measuring point at 0.3m, wherein the sound pressure level ratio of the transformer model to be measured to the scaling equivalent model is 1.2.
(3) And obtaining the vibration level and the noise level of the iron core of the equivalent model at different positions.
On the premise of no oil tank installation and oil injection, voltage or current excitation is applied to the scaling equivalent model, the accelerometer test is adopted to obtain vibration levels at different positions, the sound level meter test is adopted to obtain the iron core noise level, the noise level is multiplied by the noise level amplification ratio, and the vibration level is multiplied by the vibration level amplification ratio, namely the sound vibration level of the actual product.
And testing the vibration of different parts of the iron core by using a laser vibration meter, wherein the position of a measuring point is the installation position of the optical fiber sensor in the figure 4. Because the winding is sleeved at the middle position of the iron core, a laser signal cannot be directly incident to a measuring point position of the iron core, and therefore, the laser needs to be incident to the iron core part from the top at an angle of 30-60 degrees. Meanwhile, in order to enhance the reflection effect of the laser signals, a reflector plate is adhered to the polyester tape in the middle of the iron core, the inclination angle of the reflector plate is matched with the incident angle direction of the laser, and the total reflection of the laser signals is guaranteed. A nominal working condition was applied to the iron core model, and a noise test was performed on an envelope surface at a distance of 0.3m from the surface of the model using a sound level meter, as shown in fig. 10. The final test results are shown in the table below.
TABLE 4 iron core surface vibration test results
| Measurement point number | Position of | Measured value (m/s) 2 ) |
| 1 | Left side of upper part of iron core | 0.52 |
| 2 | Middle of iron core | 0.37 |
| 3 | Right side of the upper part of the iron core | 0.69 |
| 4 | Left side of the middle part of the iron core | 0.42 |
| 5 | Middle part of the iron core | 0.37 |
| 6 | Right side of the middle part of the iron core | 0.52 |
| 7 | Left side of iron core bottom | 0.23 |
| 8 | Middle of iron core bottom | 0.32 |
| 9 | Right side of iron core bottom | 0.31 |
TABLE 5 core noise test results
| Test point number | Measured value (dB) |
| 1 | 54 |
| 2 | 52 |
| 3 | 55 |
| 4 | 53 |
(3) And determining the sound vibration level of the iron core of the transformer to be tested based on the noise level amplification ratio, the vibration level and the noise level.
And multiplying the noise level by the noise level amplification ratio to obtain the noise level of the iron core of the transformer to be tested, and multiplying the vibration level by the vibration level amplification ratio to obtain the vibration level of the iron core of the transformer to be tested, namely the sound vibration level of the transformer to be tested.
The data in table 4 is multiplied by the vibration level amplification ratio 1.4, and the data in table 5 is multiplied by the noise level amplification ratio 1.2, which is the noise vibration data of the core of the actual transformer.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
(1) According to the invention, the scale equivalent model of the transformer to be tested is designed according to the magnetic field, structure and material equivalent principle, the model can effectively reflect the noise vibration data of an actual transformer product, is convenient to assemble and disassemble, has a lower voltage level, can directly test the iron core loading test working condition of the scale equivalent model of the transformer to be tested under the condition of no oil injection, and is convenient to directly carry out iron core noise vibration test.
(2) According to the method, a simulation analysis technology is adopted, the sound vibration level proportion coefficient of the equivalent model and the transformer to be tested under the working condition of the same proportion is calculated, and then the sound vibration test result of the equivalent model is converted into sound vibration data of the transformer to be tested through proportion conversion, so that the risks of insulation safety and the like caused by the arrangement of a sensor in an oil tank of the transformer to be tested are avoided.
(3) Vibration testing is carried out through the optical fiber accelerometer or the non-contact laser vibration meter after insulation treatment, and the electrical safety of the measuring equipment is guaranteed.
In the above, for the embodiments of the method for testing the acoustic vibration level of the iron core of the transformer provided by the present application, other embodiments for testing the acoustic vibration level of the iron core of the transformer provided by the present application are introduced below, and specific reference is made to the following.
Fig. 11 is a schematic structural diagram of an apparatus for testing a sound vibration level of an iron core of a transformer according to an embodiment of the present invention, where the apparatus includes: an equivalent model module 1101, an amplification ratio module 1102, an acquisition module 1103, and a sound vibration level module 1104.
The equivalent model module 1101 is configured to obtain an equivalent model of the transformer to be tested based on a preset standard.
The amplification ratio module 1102 is configured to determine a noise level amplification ratio and a vibration level amplification ratio of the transformer to be tested compared to the equivalent model.
An obtaining module 1103, configured to obtain vibration levels and noise levels of different positions of an iron core of the equivalent model.
And the sound vibration level module 1104 is used for determining the sound vibration level of the iron core of the transformer to be tested based on the noise level amplification ratio, the vibration level and the noise level.
The equivalent model module 1101 is specifically configured to obtain an equivalent model of the transformer to be tested based on the principles of magnetic field equivalence, material equivalence and structure equivalence for the iron core material, the winding material and the structural characteristics of the transformer to be tested.
The amplification ratio module 1102 is specifically configured to establish an equivalent model and a multi-physical-field coupling simulation model of an iron core of the transformer to be tested, and respectively obtain a noise level amplification ratio and a vibration level amplification ratio of the transformer to be tested compared with the equivalent model under the same iron core magnetic flux density.
The obtaining module 1103 is specifically configured to apply voltage or current excitation to the equivalent model on the premise that an oil tank is not installed and oil is injected, obtain vibration levels at different positions by using an accelerometer test, and obtain a noise level of the iron core by using a sound level meter test.
The acoustic vibration level module 1104 is specifically configured to multiply the noise level by a noise level amplification ratio to obtain a noise level of the iron core of the transformer to be tested; and multiplying the vibration level by the vibration level amplification ratio to obtain the vibration level of the iron core of the transformer to be tested.
The functions performed by each component in the device for testing the sound vibration level of the iron core of the transformer provided by the embodiment of the present invention are described in detail in any of the above method embodiments, and therefore, are not described herein again.
As shown in fig. 12, an embodiment of the present application provides an electronic device, where the electronic device carries a resource scheduling system as mentioned in any of the above embodiments, and includes a processor 111, a communication interface 112, a memory 113, and a communication bus 114, where the processor 111, the communication interface 112, and the memory 113 complete mutual communication through the communication bus 114.
A memory 113 for storing a computer program;
in an embodiment of the present application, when the processor 111 is configured to execute the program stored in the memory 113, the method for testing the level of the acoustic vibration of the iron core of the transformer according to any one of the foregoing method embodiments is implemented, including:
obtaining an equivalent model of the transformer to be tested based on a preset standard;
acquiring the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared with the equivalent model;
obtaining vibration levels and noise levels of different positions of an iron core of the equivalent model;
and determining the sound vibration level of the iron core of the transformer to be tested based on the noise level amplification ratio, the vibration level and the noise level.
In one example, based on a preset standard, an equivalent model of the transformer to be tested is obtained, which specifically includes:
and aiming at the iron core material, the winding material and the structural characteristics of the transformer to be tested, and obtaining an equivalent model of the transformer to be tested based on the principles of magnetic field equivalence, material equivalence and structural equivalence.
In one example, the core material and the winding material of the equivalent model are the same as those of the transformer to be tested.
In one example, the core size of the equivalent model is designed according to the scaling ratio of 1.
In one example, obtaining a noise level amplification ratio and a vibration level amplification ratio of the transformer to be tested compared with an equivalent model specifically includes:
establishing an equivalent model and a multi-physical field coupling simulation model of the iron core of the transformer to be tested, and respectively obtaining the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared with the equivalent model under the same iron core magnetic flux density.
In one example, the obtaining of the vibration level and the noise level of the iron core of the equivalent model at different positions includes:
on the premise of no oil tank installation and oil injection, voltage or current excitation is applied to the equivalent model, vibration levels at different positions are obtained by adopting an accelerometer test, and the noise level of the iron core is obtained by adopting a sound level meter test.
In one example, determining the sound vibration level of the iron core of the transformer to be tested based on the noise level amplification ratio, the vibration level and the noise level specifically includes:
multiplying the noise level by the noise level amplification ratio to obtain the noise level of the iron core of the transformer to be tested;
and multiplying the vibration level by the vibration level amplification ratio to obtain the vibration level of the iron core of the transformer to be tested. The present application further provides a computer readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the method for testing the level of acoustic vibration of the iron core of the transformer according to any of the method embodiments described above.
Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the components and steps of the various examples have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the technical solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied in hardware, a software module executed by a processor, or a combination of the two. A software module may reside in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for testing the level of acoustic vibration of a core of a transformer, the method comprising:
obtaining an equivalent model of the transformer to be tested based on a preset standard;
acquiring the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared with the equivalent model;
obtaining vibration levels and noise levels of different positions of an iron core of the equivalent model;
and determining the sound vibration level of the iron core of the transformer to be tested based on the noise level amplification ratio, the vibration level and the noise level.
2. The method according to claim 1, wherein the equivalent model of the transformer to be tested is obtained based on a preset standard, specifically:
and aiming at the iron core material, the winding material and the structural characteristics of the transformer to be tested, obtaining an equivalent model of the transformer to be tested based on the principles of magnetic field equivalence, material equivalence and structural equivalence.
3. The method of claim 2, wherein the equivalent model has the same core material and winding material as the transformer under test.
4. The method according to claim 2, wherein the core size of the equivalent model is designed according to the scaling ratio of 1.
5. The method according to claim 1, wherein the obtaining of the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared to the equivalent model specifically comprises:
and establishing the equivalent model and a multi-physical-field coupling simulation model of the iron core of the transformer to be tested, and respectively obtaining the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared with the equivalent model under the same iron core magnetic flux density.
6. The method according to claim 1, wherein the obtaining of the vibration level and the noise level of the equivalent model at different positions of the iron core comprises:
on the premise of no oil tank installation and oil injection, voltage or current excitation is applied to the equivalent model, vibration levels at different positions are obtained by adopting an accelerometer test, and the noise level of the iron core is obtained by adopting a sound level meter test.
7. The method according to claim 1, wherein the determining the level of the acoustic vibration of the core of the transformer under test based on the noise level amplification ratio, the vibration level, and the noise level comprises:
multiplying the noise level by the noise level amplification ratio to obtain the noise level of the iron core of the transformer to be tested;
and multiplying the vibration level by the vibration level amplification ratio to obtain the vibration level of the iron core of the transformer to be tested.
8. An apparatus for testing a level of acoustic vibration of an iron core of a transformer, the apparatus comprising:
the equivalent model module is used for obtaining an equivalent model of the transformer to be tested based on a preset standard;
the amplification ratio module is used for determining the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared with the equivalent model;
the acquisition module is used for acquiring the vibration level and the noise level of different positions of the iron core of the equivalent model;
and the sound vibration level module is used for determining the sound vibration level of the iron core of the transformer to be tested based on the noise level amplification ratio, the vibration level and the noise level.
9. An electronic device is characterized in that the electronic device bears the resource scheduling system and comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory complete mutual communication through the communication bus;
a memory for storing a computer program;
a processor for implementing the steps of the method for testing the level of acoustic vibration of the core of a transformer according to any one of claims 1 to 7 when executing the program stored in the memory.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method for testing the level of acoustic vibrations of a core of a transformer according to any one of claims 1-7.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116151169A (en) * | 2022-11-30 | 2023-05-23 | 西安西电变压器有限责任公司 | Method and device for predicting noise intensity of reactor |
| CN118248171A (en) * | 2024-03-21 | 2024-06-25 | 国网宁夏电力有限公司电力科学研究院 | Method, medium and system for identifying voiceprint of transformer core and clamping piece |
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2022
- 2022-07-15 CN CN202210836189.2A patent/CN115235604A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116151169A (en) * | 2022-11-30 | 2023-05-23 | 西安西电变压器有限责任公司 | Method and device for predicting noise intensity of reactor |
| CN116151169B (en) * | 2022-11-30 | 2024-03-12 | 西安西电变压器有限责任公司 | Method and device for predicting noise intensity of reactor |
| CN118248171A (en) * | 2024-03-21 | 2024-06-25 | 国网宁夏电力有限公司电力科学研究院 | Method, medium and system for identifying voiceprint of transformer core and clamping piece |
| CN118248171B (en) * | 2024-03-21 | 2024-09-24 | 国网宁夏电力有限公司电力科学研究院 | Method, medium and system for identifying voiceprint of transformer core and clamping piece |
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