CN115235604A - A method, device and electronic equipment for measuring the sound and vibration level of the iron core of a transformer - Google Patents

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

A method, device and electronic equipment for measuring the sound and vibration level of the iron core of a transformer

technical field

Embodiments of the present invention relate to the technical field of sound and vibration testing of power equipment, and in particular, to a method, device and electronic equipment for testing the sound and vibration level of an iron core of a transformer.

Background technique

With the development of economy and society, the demand for electricity of residents and industrial enterprises continues to grow. As an important equipment of power transmission network, power transformers are also continuously expanding. However, with the continuous increase of the scale of the power grid and the shortage of urban land resources, more and more substations are located in the city center. In order to reduce the impact on the surrounding acoustic environment, the noise and vibration level of the transformer has become one of the important indicators for product inspection.

Existing research shows that the noise and vibration of transformers originate from the vibration caused by the magnetostriction of the core laminations under AC conditions. Such vibrations are transmitted to the oil tank through the core pads and transformer oil, forming a "secondary vibration source". Therefore, the iron core sound vibration level directly determines the overall noise level of the transformer. However, the iron core is located inside the fuel tank, and it is in a high temperature, oil-immersed and electrified state during operation, so it is difficult to directly perform the acoustic vibration test. The existing research generally focuses on the iron core silicon steel material test and simulation calculation. The existing noise and vibration testing technology is generally aimed at the overall product after adding a fuel tank. Due to the isolation between the insulating oil and the fuel tank, the test results cannot directly reflect the sound and vibration level of the iron core.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the present invention provides a method, equipment and electronic equipment for measuring the sound and vibration level of the iron core of a transformer.

In a first aspect, the present invention provides a method for testing the sound and vibration level of an iron core of a transformer, the method comprising:

Based on the preset standard, the equivalent model of the transformer to be tested is obtained;

Acquiring the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared to the equivalent model;

Obtain vibration levels and noise levels at different positions of the iron core of the equivalent model;

Based on the noise level amplification ratio, the vibration level amplification ratio, the vibration level and the noise level, the sound vibration level of the iron core of the transformer under test is determined.

In a possible implementation manner, the equivalent model of the transformer to be tested is obtained based on a preset standard, specifically:

For the core material, winding material and structural characteristics of the transformer to be tested, based on the principles of magnetic field equivalence, material equivalence and structural equivalence, an equivalent model of the transformer to be tested is obtained.

In a possible implementation manner, the core material and winding material of the equivalent model are the same as the core material and winding material of the transformer to be tested.

In a possible implementation manner, the size of the iron core of the equivalent model is designed in a scale of 1:3 to 1:5 of the size of the iron core of the transformer to be tested.

In a possible implementation manner, the acquiring the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared to the equivalent model specifically includes:

Establish the equivalent model and the multi-physics coupling simulation model of the iron core of the transformer under test, and obtain the noise level amplification ratio and vibration level of the transformer under test compared to the equivalent model under the same core magnetic flux density. magnification ratio.

In a possible implementation manner, the acquisition of vibration levels and noise levels at different positions of the iron core of the equivalent model is specifically:

Under the premise of not installing the oil tank and filling oil, voltage or current excitation is applied to the equivalent model, and the vibration level at different positions is obtained by using the accelerometer test, and the noise level of the iron core is obtained by using the sound level meter test.

In a possible implementation manner, the 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 amplification ratio, the vibration level and the noise level, specifically includes :

The noise level is multiplied by the noise level amplification ratio to obtain the noise level of the iron core of the transformer under test;

The vibration level is multiplied 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 a device for testing the sound and vibration level of the iron core of a transformer, the device comprising:

The equivalent model module is used to obtain the equivalent model of the transformer to be tested based on the preset standard;

an amplification ratio module, configured to obtain the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared to the equivalent model;

an acquisition module for acquiring vibration levels and noise levels at different positions of the iron core of the equivalent model;

A sound and vibration level module, configured to determine the sound and vibration level of the iron core of the transformer under test based on the noise level amplification ratio, the vibration level amplification ratio, the vibration level and the noise level.

In a third aspect, the present invention provides an electronic device that carries the resource scheduling system, including a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus. communication between;

memory for storing computer programs;

The processor is configured to implement the steps of the method for testing the sound and 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 on which a computer program is stored, and when the computer program is executed by a processor, realizes the acoustic vibration level of the iron core of the transformer according to any one of the embodiments of the first aspect Steps of the test method.

Compared with the prior art, the above-mentioned technical solutions provided in the embodiments of the present application have the following advantages:

In the method provided by the embodiment of the present application, an equivalent model of the transformer to be tested is obtained based on a preset standard. Acquiring the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared to the equivalent model. Obtain vibration levels and noise levels at different positions of the core of the equivalent model. Based on the noise level amplification ratio, the vibration level amplification ratio, the vibration level and the noise level, the sound vibration level of the iron core of the transformer under test is determined. In this method, the equivalent model of the actual transformer is designed through the preset standard, which effectively reflects the noise and vibration data of the actual transformer, and the transformer core can be directly loaded under the test conditions without oil injection, which is convenient for the direct core noise and vibration test. , and then convert the sound and vibration test results of the equivalent model into the sound and vibration data of the actual transformer product, avoiding the risks of insulation safety caused by arranging sensors in the actual transformer tank. Characteristic analysis provides an effective test solution and avoids the deficiencies of conventional test techniques in insulation design and installation.

Description of drawings

1 is a schematic flowchart of a method for testing the sound and vibration level of an iron core of a transformer according to an embodiment of the present invention;

Fig. 2 is the iron core magnetic flux density simulation diagram of the scaled equivalent model in embodiment 1;

Fig. 3 is the iron core magnetic flux density simulation diagram of the transformer to be tested in the embodiment 1;

Figure 4 is a schematic diagram of the core structure of the scaled equivalent model;

Fig. 5 is A-A sectional view in Fig. 4;

Fig. 6 is the iron core vibration simulation diagram of the scaled equivalent model in the embodiment 1;

Fig. 7 is the iron core vibration simulation diagram of the transformer to be tested in the embodiment 1;

8 is a simulation diagram of iron core noise of a scaled-down equivalent model in Embodiment 1;

Fig. 9 is the iron core noise simulation diagram of the transformer to be tested in the embodiment 1;

Figure 10 is a schematic diagram of a scaled equivalent model noise test;

11 is a schematic structural diagram of a device for testing the sound and 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 optic accelerometer, 3—polyester tape.

Detailed ways

In order to make the purposes, 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 accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In order to facilitate the understanding of the embodiments of the present invention, further explanation will be given below with specific embodiments in conjunction with the accompanying drawings, and the embodiments do not constitute limitations to the embodiments of the present invention.

In order to solve the deficiencies of the prior art, the present invention provides a method for testing the sound and vibration level of the iron core of a transformer, as shown in FIG. A schematic flowchart of the method, as shown in Figure 1, the method includes the following steps:

Step 110, based on a preset standard, obtain an equivalent model of the transformer to be tested.

Specifically, the noise of the transformer is mainly generated by the iron core, and the selection of the magnetic density of the iron core is very important to the influence of the transformer noise. In an example, an equivalent model of the transformer to be tested is obtained based on the principles of magnetic field equivalence, material equivalence and structural equivalence for the core material, winding material and structural characteristics of the transformer to be tested. Through the equivalent principle of magnetic field, structure and material, the equivalent model of transformer is obtained, which can effectively reflect the noise and vibration data of actual transformer products.

In another example, the core material and winding material of the equivalent model are the same as the core material and winding material of the transformer under test.

In yet another example, the equivalent model obtained in this application is a scaled equivalent model, and since the noise level of the transformer is mainly affected by the capacity and size when the structure, operating conditions and technological level are consistent, the higher the capacity Larger and larger transformers have higher noise levels. Therefore, in the design process of the scaled model, it is very important to choose the appropriate scale. A scaled model that is too small will result in lower noise, which is not conducive to pilot testing, and a model that is too large will exceed the power supply capabilities in the test station. After comprehensively considering the noise level of the scaled model and the limitation of the test ability, the core size of the equivalent model is designed in a scaled ratio of 1:3 to 1:5 of the core size of the transformer to be tested.

In another example, the winding size of the equivalent model is not scaled down. By establishing a simulation analysis model of the core magnetic field of the transformer to be tested under rated operating conditions, the core magnetic density level is obtained, and the windings of the equivalent model of the transformer are adjusted accordingly. Size, number of turns, rated current and voltage parameters so that the core density level is consistent with the transformer under test.

Step 120: Obtain the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared to the equivalent model.

In one example, an equivalent model and a multi-physics coupling simulation model of the core of the transformer to be tested are established, and under the same core magnetic flux density, the amplification ratio of the noise level and the vibration of the transformer to be tested compared to the equivalent model are obtained respectively. Horizontal magnification ratio. Among them, the multi-physics coupling simulation model includes: electromagnetic, vibration and noise simulation model.

Specifically, the electromagnetic, vibration and noise simulation model is calculated under specific working conditions to obtain the vibration level of the core column and the iron yoke position of the transformer to be tested and the equivalent model, and the noise level of the envelope surface at a distance of 0.3m from the core surface, Then, the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared with the equivalent model are obtained by calculation.

Using simulation analysis technology, the proportional coefficient of the sound and vibration level of the equivalent model and the transformer to be tested under the same ratio is calculated and obtained, and then the sound and vibration test results of the equivalent model are converted into the sound and vibration level of the actual product through scale conversion. It avoids the risks of insulation safety caused by arranging sensors in the actual transformer tank.

Step 130, obtaining vibration levels and noise levels at different positions of the iron core of the equivalent model.

In one example, voltage or current excitation is applied to the equivalent model without installing the oil tank and oil filling, and the vibration level at different positions is obtained by accelerometer test, and the noise level of the iron core is obtained by the sound level meter test. Specifically, the sound level meter was arranged on the envelope surface at a distance of 0.3m from the surface of the iron core to measure the noise level. The equivalent model designed by the invention is easy to assemble and disassemble, has a low voltage level, can directly load the transformer core under the condition of no oil filling, and is convenient to directly test the noise and vibration of the core.

In one example, the accelerometer is a fiber optic accelerometer or a laser vibrometer.

If it is a fiber optic accelerometer, use polyester tape to bind and fix it on the iron yoke and iron core, and place insulating cardboard between the sensor and the iron yoke and iron core. Cardboard fits snugly. If it is a laser vibrometer, the laser signal is directly incident on the measuring point to measure the vibration. The vibration test is carried out through the insulated fiber accelerometer or the non-contact laser vibrometer to ensure the electrical safety of the measurement equipment.

Step 140: Determine the sound and vibration level of the iron core of the transformer to be tested based on the noise level amplification ratio, the vibration level amplification ratio, the vibration level and the noise level.

Specifically, the noise level is multiplied by the noise level amplification ratio to obtain the noise level of the iron core of the transformer under test; the vibration level is multiplied by the vibration level amplification ratio to obtain the vibration level of the iron core of the transformer under test.

The method provided by the embodiment of the present application obtains 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 to the equivalent model. Obtain vibration levels and noise levels at different positions of the core of the equivalent model. Based on the noise level amplification ratio, the vibration level amplification ratio, the vibration level and the noise level, the sound vibration level of the iron core of the transformer under test is determined. In this method, the equivalent model of the actual transformer is designed through the preset standard, which effectively reflects the noise and vibration data of the actual transformer, and the transformer core can be directly loaded under the test conditions without oil injection, which is convenient for the direct core noise and vibration test. , and then convert the sound and vibration test results of the equivalent model into the sound and vibration data of the actual transformer product, avoiding the risks of insulation safety caused by arranging sensors in the actual transformer tank. Characteristic analysis provides an effective test solution and avoids the deficiencies of conventional test techniques in insulation design and installation.

According to the above-mentioned method for testing the sound vibration level of the iron core of a transformer, the specific embodiment 1 and the embodiment 2 are respectively described in detail:

Example 1

The 110kV50MVA transformer product produced by an equipment factory is about to be put into operation, and the actual transformer is used as the transformer to be tested. In order to grasp the noise and vibration characteristics of its iron core, the following schemes are used for testing:

(1) Based on the preset standard, the equivalent model of the transformer to be tested is obtained.

According to the material and structural characteristics of the transformer core and winding, a transformer equivalent model is designed and manufactured using the principles of magnetic field equivalence, structural equivalence and material equivalence.

Taking into account the noise level of the equivalent model and the limitation of the test capability, this project chooses to reduce the size of the equivalent model at a ratio of 1:3, that is, the size of the equivalent model is reduced to 1/3 of the original product size, and the designed equivalent model is reduced. than the equivalent model. The specific design parameters of the scaled equivalent model are as follows:

①Capacity, voltage and connection group

Number of phases: 3 phases

Rated capacity: 800kVA

Rated voltage: 10kV

Linkage group: YNd11

②Core material and structure

Silicon steel sheet grade: B30P105

Core form: three-phase three-column miter joint

Core magnetic density: 1.748T

Iron core series: 15

Lap length: 18mm

③ Winding structure

Design according to the capacity and voltage level, no need to scale down. The number of turns of the high-voltage winding is 425, and the number of turns of the low-voltage winding is 28. The winding height is 330mm, the inner diameter is 340mm, and the outer diameter is 430mm.

④Fuel tank structure

Fuel tank form: bell type

Tank Outline Dimensions: Scaled Down

Fuel tank thickness: selected according to the actual situation in a ratio close to 1:3

⑤ Fuel tank assembly

The size of fuel tank components such as oil pillows, bushings, and chips can be adjusted according to the actual situation, and try to ensure the ratio of 1:3 or carry out corresponding counterweight treatment.

The noise of the transformer is mainly generated by the iron core, and the selection of the magnetic density of the iron core is very important to the influence of the transformer noise. Therefore, in addition to the core structure of the scaled equivalent model being consistent with the core structure of the 110kV transformer to be tested, its core magnetic density should also be consistent with the core magnetic density of the 110kV transformer to be tested. Therefore, MagNet electromagnetic simulation software is used to simulate and analyze the scaled model and the no-load magnetic field of the 110kV transformer under test, and the average magnetic density of the iron core is investigated. Figures 2 and 3 show the comparison between the scaled equivalent model at rated voltage and the magnetic field distribution on the surface of the core of the 110kV transformer to be tested and the magnetic density distribution along the axial section of the core center. The table below shows the comparison between the scaled equivalent model and the average magnetic density of the core column of the 110kV transformer under test.

Table 1 Comparison between the scaled equivalent model and the average magnetic density of the core of the 50MVA/110kV transformer to be tested

Model Core column average magnetic density (T) Average magnetic density of yoke (T) scale model 1.745 1.751 110kV Products 1.741 1.748 error 0.23% 0.17%

The general structure of the scaled equivalent model is shown in Figure 4.

Considering that the winding noise in the actual 50MVA/110kV transformer under test is not obvious, it is simplified in the design of the winding of the scaled equivalent model, that is, according to the size, capacity, voltage of the iron core of the scaled equivalent model Windings are electrically designed for grades, etc., not to scale and structure. The final scaled equivalent model is a 10kV800kVA capacity product.

(2) Determine the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared to the equivalent model.

The scaled equivalent model and the multi-physics coupling simulation model of the core of the transformer under test are established. Under the same core magnetic flux density, the noise level amplification ratio and the vibration level amplification ratio of the transformer under test compared with the equivalent model are calculated and obtained respectively. .

Using finite element simulation software, firstly, according to the parameters such as core size, the scaled equivalent model and the geometric model of the transformer to be tested are established; then, according to the H-B curve, Young's modulus, Poisson's ratio, density, relative Parameters such as permittivity, define the material properties of the model, and set fixed constraint boundary conditions for the position of the iron core pads. At the same time, the iron core and air domain are defined by using the circuit-magnetic field-solid mechanics-acoustic multiphysics coupling module. The rated voltage conditions are set on the windings. After the meshing is completed, structural mechanics and acoustic calculations are performed to obtain the simulation analysis results of the scaled equivalent model and the vibration field and sound field of the transformer under test, as shown in Figures 6 to 9. According to the simulation results in the figure, the vibration acceleration ratio of the transformer model to be tested and the scaled equivalent model is 1.7; taking the noise measuring point at 0.3m, the sound pressure level ratio of the transformer model to be tested and the scaled equivalent model is 1.18.

(3) Obtain the vibration level and noise level at different positions of the iron core of the equivalent model.

Under the premise of not installing a fuel tank and filling oil, voltage or current excitation is applied to the scaled equivalent model, and the vibration level at different positions is obtained by using the accelerometer test, and the noise level of the iron core is obtained by using the sound level meter test.

According to the installation plan in Figure 4, 8 fiber optic acceleration sensors are fastened and fixed on the iron yoke and the iron core column respectively, and insulating cardboard is placed between the sensor and the iron yoke and the iron core column, and the binding tape is indented at the same time to ensure the sensor Fits tightly with insulating cardboard. The rated working conditions are applied to the iron core model, and the sound level meter is used for noise testing on the envelope surface at a distance of 0.3m from the surface of the model, as shown in Figure 10. The final test results are shown in the table below.

Table 2 Vibration test results of iron core surface

Measuring point number Location Measured value (m/s²) 1 Upper left side of iron core 0.45 2 The middle of the upper part of the iron core 0.32 3 Right side of the upper part of the iron core 0.58 4 Iron center left 0.37 5 middle of iron core 0.27 6 Right side of iron core 0.36 7 Bottom left of core 0.17 8 bottom middle of core 0.21 9 Bottom right side of core 0.23

Table 3 Core noise test results

Measuring point number Measured value (dB) 1 50 2 49 3 51 4 49

(3) Determine the sound vibration level of the iron core of the transformer to be tested based on the noise level amplification ratio, the vibration level amplification ratio, the vibration level and the noise level.

The noise level is multiplied by the noise level amplification ratio to obtain the noise level of the iron core of the transformer under test, and the vibration level is multiplied by the vibration level amplification ratio to obtain the vibration level of the iron core of the transformer under test, which is the sound vibration level of the transformer under test.

Multiply the data in Table 2 by the vibration level amplification ratio of 1.7, and multiply the data in Table 3 by the noise level amplification ratio of 1.18, which is the actual noise and vibration data of the iron core of the transformer.

Example 2

The 220kV50MVA transformer product produced by an equipment factory is about to be put into operation, and the actual transformer is used as the transformer to be tested. In order to grasp the noise and vibration characteristics of its iron core, the following schemes are used for testing:

(1) Based on the preset standard, the equivalent model of the transformer to be tested is obtained.

According to the material and structural characteristics of the transformer core and winding, the principle of magnetic field equivalence, structural equivalence and material equivalence is adopted to design and manufacture a transformer equivalent model

After comprehensively considering the noise level of the equivalent model and the limitations of the test capability, this project chooses to reduce the size of the transformer model at a ratio of 1:5, that is, the size of the scaled transformer model is reduced to 1/5 of the original product size, and the designed equivalent The model is a scaled equivalent model. The specific design parameters of the scaled equivalent model are as follows:

①Capacity, voltage and connection group

Number of phases: 3 phases

Rated capacity: 3150kVA

Rated voltage: 35kV

Linkage group: YNd11

②Core material and structure

Silicon steel sheet grade: B30P105

Core form: three-phase three-column miter joint

Core magnetic density: 1.7832T

③ Winding structure

Design according to the capacity and voltage level, no need to scale down.

④Fuel tank structure

Fuel tank form: bell type

Tank Outline Dimensions: Scaled Down

Fuel tank thickness: selected according to the actual situation in a ratio close to 1:5

⑤ Fuel tank assembly

The dimensions of oil pillows, bushings, chips and other fuel tank components can be adjusted according to the actual situation, try to ensure the ratio of 1:5 or carry out corresponding counterweight treatment.

In order to ensure that the equivalent model of the transformer is consistent with the magnetic density of the transformer product, the coil winding size and current size of the model are set so that the average magnetic flux density is about 1.78T. The final rated current is set to 70A, the height is 350mm, the inner diameter of the coil is 370mm, and the outer diameter is 450mm. The number of turns of the high-voltage winding is 440, and the number of turns of the low-voltage winding is 30.

(2) Determine the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared to the equivalent model.

The scaled equivalent model and the multi-physics coupling simulation model of the core of the transformer under test are established. Under the same core magnetic flux density, the amplification ratios of noise and vibration levels of the transformer under test compared with the equivalent model are calculated respectively.

Using finite element simulation software, firstly, according to the parameters such as core size, the scaled equivalent model and the geometric model of the transformer to be tested are established; then, according to the H-B curve, Young's modulus, Poisson's ratio, density, relative Parameters such as permittivity, define the material properties of the model, and set fixed constraint boundary conditions for the position of the iron core pads. At the same time, the iron core and air domain are defined by using the circuit-magnetic field-solid mechanics-acoustic multiphysics coupling module. The rated voltage conditions are set on the windings, and after meshing is completed, structural mechanics and acoustic calculations are performed to obtain the scaled equivalent model and the simulation analysis results of the vibration field and sound field of the transformer to be tested. According to the simulation results in the figure, the ratio of vibration acceleration between the transformer model to be tested and the scaled equivalent model is 1.4; taking the noise measuring point at 0.3 m, the ratio of the sound pressure level of the transformer model to be tested to the scaled equivalent model is 1.2.

(3) Obtain the vibration level and noise level at different positions of the iron core of the equivalent model.

Under the premise of not installing the oil tank and filling oil, apply voltage or current excitation to the scaled equivalent model, use the accelerometer to test to obtain the vibration level at different positions, use the sound level meter to test to obtain the iron core noise level, and multiply the noise level by the noise level to amplify The ratio, the vibration level multiplied by the vibration level amplification ratio, is the sound and vibration level of the actual product.

A laser vibrometer is used to test the vibration of different parts of the iron core, and the measurement point is the installation position of the optical fiber sensor in Figure 4. Among them, the laser signal cannot be directly incident on the measuring point of the iron core due to the winding set in the middle of the iron core, so the laser must be incident on the iron core from the top at an angle of 30° to 60°. At the same time, in order to enhance the reflection effect of the laser signal, a reflective sheet is pasted on the polyester tape in the inner part of the iron core, and its inclination angle is matched with the incident angle of the laser to ensure the total reflection of the laser signal. The rated working conditions are applied to the iron core model, and the sound level meter is used for noise testing on the envelope surface at a distance of 0.3m from the surface of the model, as shown in Figure 10. The final test results are shown in the table below.

Table 4 Vibration test results of iron core surface

Measuring point number Location Measured value (m/s²) 1 Upper left side of iron core 0.52 2 The middle of the upper part of the iron core 0.37 3 Right side of the upper part of the iron core 0.69 4 Iron center left 0.42 5 middle of iron core 0.37 6 Right side of iron core 0.52 7 Bottom left of core 0.23 8 bottom middle of core 0.32 9 Bottom right side of core 0.31

Table 5 Core noise test results

Measuring point number Measured value (dB) 1 54 2 52 3 55 4 53

(3) Determine the sound vibration level of the iron core of the transformer to be tested based on the noise level amplification ratio, the vibration level amplification ratio, the vibration level and the noise level.

The noise level is multiplied by the noise level amplification ratio to obtain the noise level of the iron core of the transformer under test, and the vibration level is multiplied by the vibration level amplification ratio to obtain the vibration level of the iron core of the transformer under test, which is the sound vibration level of the transformer under test.

Multiply the data in Table 4 by the vibration level amplification ratio of 1.4, and the data in Table 5 by the noise level amplification ratio of 1.2, which is the actual noise and vibration data of the iron core of the transformer.

Compared with the prior art, the above-mentioned technical solutions provided in the embodiments of the present application have the following advantages:

(1) The present invention designs a scaled equivalent model of the transformer to be tested based on the equivalent principle of magnetic field, structure and material. The model can effectively reflect the noise and vibration data of the actual transformer product, and is easy to assemble and disassemble, and the voltage level is low. The iron core loading test condition of the scaled equivalent model of the transformer to be tested can be directly performed without oil injection, which is convenient for direct iron core noise and vibration test.

(2) The present invention adopts the simulation analysis technology to calculate and obtain the proportional coefficient of the sound and vibration level of the equivalent model and the transformer to be tested under the same proportional working conditions, and then convert the sound and vibration test results of the equivalent model into The acoustic and vibration data of the transformer under test avoids the risk of insulation safety caused by arranging sensors in the oil tank of the transformer under test.

(3) The vibration test is carried out through the fiber optic accelerometer or non-contact laser vibrometer after insulation treatment, which ensures the electrical safety of the measuring equipment.

The above is the embodiment of the method for testing the sound and vibration level of the iron core of the transformer provided by the present application. The following describes other embodiments of the sound and vibration level test of the iron core of the transformer provided by the present application, and the details are as follows.

11 is a schematic structural diagram of a device for testing the sound and vibration level of a transformer core provided in an embodiment of the present invention. The device includes: an equivalent model module 1101 , an amplification ratio module 1102 , an acquisition module module 1103 , and a sound and vibration level module 1104 .

The equivalent model module 1101 is used for obtaining an equivalent model of the transformer to be tested based on a preset standard.

The amplification ratio module 1102 is configured to determine the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared with the equivalent model.

The obtaining module 1103 is used to obtain vibration levels and noise levels of different positions of the iron core of the equivalent model.

The sound and vibration level module 1104 is configured to determine the sound and vibration level of the iron core of the transformer under test based on the noise level amplification ratio, the vibration level amplification ratio, the vibration level and the noise level.

The equivalent model module 1101 is specifically used to obtain an equivalent model of the transformer to be tested based on the principles of magnetic field equivalence, material equivalence and structural equivalence for the core material, winding material and structural characteristics of the transformer to be tested.

The amplification ratio module 1102 is specifically used for establishing an equivalent model and a multi-physics coupling simulation model of the iron core of the transformer under test, and under the same core magnetic flux density, respectively obtains the amplification of the noise level of the transformer under test compared with the equivalent model Ratio to Vibration Level Amplification Ratio.

The acquisition module 1103 is specifically used for applying voltage or current excitation to the equivalent model without installing the oil tank and filling oil, using the accelerometer test to obtain the vibration level at different positions, and using the sound level meter test to obtain the noise level of the iron core.

The acoustic vibration level module 1104 is specifically used to multiply the noise level by the noise level amplification ratio to obtain the noise level of the iron core of the transformer under test; multiply the vibration level by the vibration level amplification ratio to obtain the vibration level of the iron core of the transformer under test.

The functions performed by each component in the device for testing the sound and vibration level of the iron core of the transformer provided in the embodiment of the present invention have been described in detail in any of the above method embodiments, and thus are not repeated here.

As shown in FIG. 12, an embodiment of the present application provides an electronic device. The electronic device carries the resource scheduling system mentioned in any of the above embodiments, including a processor 111, a communication interface 112, a memory 113, and a communication bus 114. The processor 111 , the communication interface 112 , and the memory 113 communicate with each other through the communication bus 114 .

a memory 113 for storing computer programs;

In an embodiment of the present application, the processor 111 is configured to implement the method for testing the sound and vibration level of the iron core of a transformer provided by any one of the foregoing method embodiments when executing the program stored in the memory 113, including:

Based on the preset standard, the equivalent model of the transformer to be tested is obtained;

Obtain the noise level amplification ratio and vibration level amplification ratio of the transformer under test compared to the equivalent model;

Obtain the vibration level and noise level at different positions of the iron core of the equivalent model;

Based on the noise level amplification ratio, the vibration level amplification ratio, the vibration level and the noise level, the sound vibration level of the iron core of the transformer to be tested is determined.

In an example, an equivalent model of the transformer to be tested is obtained based on a preset standard, specifically:

According to the core material, winding material and structural characteristics of the transformer to be tested, based on the principles of magnetic field equivalence, material equivalence and structural equivalence, the equivalent model of the transformer to be tested is obtained.

In one example, the core material and winding material of the equivalent model are the same as the core material and winding material of the transformer under test.

In one example, the core size of the equivalent model is designed in a scale of 1:3 to 1:5 of the core size of the transformer to be tested.

In an example, obtaining the noise level amplification ratio and vibration level amplification ratio of the transformer under test compared with the equivalent model, specifically including:

The equivalent model and the multi-physics coupling simulation model of the core of the transformer under test are established. Under the same core magnetic flux density, the noise level amplification ratio and vibration level amplification ratio of the transformer under test compared with the equivalent model are obtained respectively.

In an example, the vibration level and noise level at different positions of the iron core of the equivalent model are obtained, specifically:

Under the premise of not installing the oil tank and filling oil, voltage or current excitation is applied to the equivalent model, and the vibration level at different positions is obtained by using the accelerometer test, and the noise level of the iron core is obtained by using the sound level meter test.

In an example, based on the noise level amplification ratio, the vibration level amplification ratio, the vibration level and the noise level, the sound vibration level of the iron core of the transformer to be tested is determined, which specifically includes:

Multiply the noise level by the noise level amplification ratio to obtain the noise level of the iron core of the transformer under test;

Multiply the vibration level by the vibration level amplification ratio to obtain the vibration level of the iron core of the transformer under test. The embodiments of the present application further provide a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, implements the steps of the method for testing the sound and vibration level of the iron core of a transformer provided by any one of the foregoing method embodiments .

Professionals should be further aware that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. Interchangeability, the above description has generally described the components and steps of each example in terms of function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of the present invention.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be implemented in hardware, a software module executed by a processor, or a combination of the two. A software module can be placed in random access memory (RAM), internal memory, read only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other in the technical field. in any other known storage medium

The above are only specific embodiments of the present invention, so that those skilled in the art can understand or implement 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 implemented in 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 claimed herein.

Claims (10)

1. the sound vibration level testing method of the iron core of a transformer, is characterized in that, described method comprises: Based on the preset standard, the equivalent model of the transformer to be tested is obtained; Acquiring the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared to the equivalent model; Obtain vibration levels and noise levels at different positions of the iron core of the equivalent model; Based on the noise level amplification ratio, the vibration level amplification ratio, the vibration level and the noise level, the sound vibration level of the iron core of the transformer under test is determined. 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: For the core material, winding material and structural characteristics of the transformer to be tested, based on the principles of magnetic field equivalence, material equivalence and structural equivalence, an equivalent model of the transformer to be tested is obtained. 3 . The method according to claim 2 , wherein the core material and the winding material of the equivalent model are the same as the core material and the winding material of the transformer to be tested. 4 . 4 . The method according to claim 2 , wherein the size of the iron core of the equivalent model is designed in a scaled ratio of 1:3 to 1:5 of the size of the iron core of the transformer to be tested. 5 . 5. The method according to claim 1, wherein the acquiring the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared to the equivalent model, specifically comprises: Establish the equivalent model and the multi-physics coupling simulation model of the iron core of the transformer under test, and obtain the noise level amplification ratio and vibration level of the transformer under test compared to the equivalent model under the same core magnetic flux density. magnification ratio. 6. The method according to claim 1, wherein the obtaining the vibration level and the noise level at different positions of the iron core of the equivalent model is specifically: Under the premise of not installing the oil tank and filling oil, voltage or current excitation is applied to the equivalent model, and the vibration level at different positions is obtained by using the accelerometer test, and the noise level of the iron core is obtained by using the sound level meter test. 7 . The method according to claim 1 , wherein the iron core of the transformer under test is determined based on the noise level amplification ratio, the vibration level amplification ratio, the vibration level and the noise level. 8 . sound and vibration levels, including: The noise level is multiplied by the noise level amplification ratio to obtain the noise level of the iron core of the transformer under test; The vibration level is multiplied by the vibration level amplification ratio to obtain the vibration level of the iron core of the transformer to be tested. 8. A device for testing the sound and vibration level of an iron core of a transformer, wherein the device comprises: The equivalent model module is used to obtain the equivalent model of the transformer to be tested based on the preset standard; an amplification ratio module for determining the noise level amplification ratio and the vibration level amplification ratio of the transformer to be tested compared to the equivalent model; an acquisition module for acquiring vibration levels and noise levels at different positions of the iron core of the equivalent model; A sound and vibration level module, configured to determine the sound and vibration level of the iron core of the transformer under test based on the noise level amplification ratio, the vibration level amplification ratio, the vibration level and the noise level. 9. An electronic device, characterized in that the electronic device carries the resource scheduling system, comprising a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory complete the communication between each other through the communication bus. communication; memory for storing computer programs; The processor is configured to implement the steps of the method for testing the sound and vibration level of the iron core of a transformer according to any one of claims 1-7 when executing the program stored in the memory. 10. A computer-readable storage medium on which a computer program is stored, characterized in that, when the computer program is executed by a processor, the sound vibration level of the iron core of the transformer according to any one of claims 1-7 is realized Steps of the test method.

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