Testing method, device and equipment for testing voltage of high-frequency transformer and storage medium

Abstract

The invention discloses a high-frequency transformer test voltage testing method, device and equipment and a storage medium, and the method comprises the steps: carrying out an external voltage withstanding test on an insulating material of a high-frequency transformer, and obtaining the relation between the breakdown voltage and the voltage withstanding time of the insulating material at each frequency, and according to the relationship, obtaining a 1min withstand voltage value of the insulating material under the high frequency and the power frequency so as to calculate a withstand voltage test suggested value of the high-frequency transformer under the power frequency, and obtaining a partial discharge test suggested value of the high-frequency transformer under the power frequency through a partial discharge test. Therefore, the test voltage suggested value of the withstand voltage test can be closer to the voltage stress distribution under the actual working condition, the withstand voltage capability of the insulation structure under the high-frequency operation condition is effectively evaluated, and the test voltage suggested value of the partial discharge test can truly reflect the discharge characteristic and the degradation trend of the insulation material during high-frequency operation. Therefore, the insulation performance can be evaluated more reliably.

Description

Technical Field

[0001] The present application relates to the field of transformer technology, and more specifically, to a testing method, device, equipment and storage medium for high-frequency transformer test voltage. Background Art

[0002] In the wave of power system evolution towards intelligence and distribution, power electronic transformer (PET), as a key technology, is of great significance to the grid connection of distributed power sources and AC and DC connections of different voltage levels.

[0003] The high-frequency transformer in PET is a core component, with an operating frequency of 400-40kHz and a local temperature of over 150°C. Although polyimide (PI) is widely used in high-frequency insulation, its withstand voltage capability is reduced at high frequencies, and high dielectric loss and strong local discharge lead to a significant reduction in insulation life.

[0004] Internationally, high-frequency transformers lack a complete factory insulation test method and quality assessment system. Power frequency transformers have mature insulation test methods. However, due to the special location of high-frequency transformers, lightning and switching impulse tests are not applicable, and partial discharge measurement and external withstand voltage test are still valuable.

[0005] In actual projects, complex high-frequency voltage waveforms are difficult to generate, and power frequency voltage is often used to measure the insulation of high-frequency equipment. However, when high-frequency power transformers are inspected at the factory, the power frequency withstand voltage standards for high and low voltage windings are unclear, and the basis for partial discharge measurement is insufficient. Most of the power frequency equipment standards are used as a reference, and the test results are not good.

[0006] Based on this, how to accurately test the test voltage of the high-frequency transformer at the industrial frequency to obtain the withstand voltage test voltage value and the partial discharge test voltage value is a problem that needs to be solved. Summary of the invention

[0007] In view of the above problems, the present application provides a testing method, device, equipment and storage medium for a high-frequency transformer test voltage, so as to accurately test the test voltage of the high-frequency transformer at the industrial frequency to obtain the withstand voltage test voltage value and the partial discharge test voltage value.

[0008] In order to achieve the above objectives, the specific plan is proposed as follows:

[0009] A method for testing a high-frequency transformer test voltage, comprising:

[0010] Under multiple frequencies, an external withstand voltage test is performed on the insulating material of the high-frequency transformer to obtain the relationship between the breakdown voltage and the withstand voltage time of the insulating material under each frequency, wherein the multiple frequencies include power frequency and high-frequency frequency;

[0011] According to the relationship, the 1-min withstand voltage value of the insulating material at the high frequency is obtained, and the 1-min withstand voltage value of the insulating material at the power frequency is determined, and based on the 1-min withstand voltage value of the insulating material at the high frequency and the 1-min withstand voltage value of the insulating material at the power frequency, the withstand voltage test voltage value of the high-frequency transformer at the power frequency is calculated;

[0012] According to the relationship, the withstand voltage value corresponding to the expected life of the insulating material at the power frequency is determined, and the withstand voltage value corresponding to the expected life of the insulating material at the high-frequency frequency is determined; and based on the withstand voltage value corresponding to the expected life of the insulating material at the power frequency and the withstand voltage value corresponding to the expected life of the insulating material at the high-frequency frequency, the partial discharge test voltage value of the high-frequency transformer at the power frequency is calculated.

[0013] Optionally, calculating the withstand voltage test voltage value of the high-frequency transformer at the power frequency according to the 1-min withstand voltage value of the insulating material at the high frequency and the 1-min withstand voltage value of the insulating material at the power frequency includes:

[0014] Use the following formula to calculate the power frequency high frequency conversion factor:

[0015]

[0016] in, is the industrial frequency high frequency conversion factor, is the 1-min withstand voltage value of the insulating material at the high frequency, is the 1-min withstand voltage value of the insulating material at the power frequency;

[0017] The 1-minute withstand voltage test voltage value of the high-frequency transformer at the high-frequency frequency corresponding to the preset high-frequency voltage is calculated using the following formula:

[0018]

[0019] in, For the expected life span corresponding to the withstand voltage value, The highest voltage of the high frequency transformer equipment, It is the standard coefficient of the withstand voltage test of the power frequency transformer;

[0020] The power frequency high frequency conversion coefficient is multiplied by the 1 min withstand voltage test voltage value to obtain the withstand voltage test voltage value of the high frequency transformer at the power frequency.

[0021] Optionally, based on the withstand voltage value corresponding to the expected life of the insulating material at the power frequency and the withstand voltage value corresponding to the expected life of the insulating material at the high frequency frequency, calculating the partial discharge test voltage value of the high-frequency transformer at the power frequency includes:

[0022] Use the following formula to calculate the power frequency high frequency partial discharge test voltage proportionality coefficient:

[0023]

[0024] in, is the power frequency high frequency partial discharge test voltage proportionality coefficient, The withstand voltage value corresponding to the expected service life of the insulating material at the power frequency, is the withstand voltage value corresponding to the expected service life of the insulating material at the high frequency;

[0025] The partial discharge test voltage value of the high-frequency transformer at the power frequency is calculated using the following formula:

[0026]

[0027] in, is the partial discharge test voltage value of the high-frequency transformer at the power frequency, It is the voltage value of the partial discharge measurement test performed on the insulating material under the preset measurement time.

[0028] Optionally, the industrial frequency is 50 Hz, and the high frequency is 10 kHz, 20 kHz, 30 kHz or 40 kHz.

[0029] Optionally, the insulating material is made of polyimide.

[0030] A test device for high-frequency transformer test voltage, comprising:

[0031] A voltage-time relationship measurement unit, used to perform an external withstand voltage test on the insulating material of the high-frequency transformer at multiple frequencies to obtain the relationship between the breakdown voltage and the withstand voltage time of the insulating material at each frequency, wherein the multiple frequencies include power frequency and high-frequency frequency;

[0032] A withstand voltage test value calculation unit for a withstand voltage test, configured to obtain the 1-min withstand voltage value of the insulating material at the high frequency according to the relationship, determine the 1-min withstand voltage value of the insulating material at the power frequency, and calculate the withstand voltage test voltage value of the high-frequency transformer at the power frequency based on the 1-min withstand voltage value of the insulating material at the high frequency and the 1-min withstand voltage value of the insulating material at the power frequency;

[0033] The partial discharge test voltage value calculation unit is used to determine the withstand voltage value corresponding to the expected life of the insulating material at the power frequency according to the relationship, and determine the withstand voltage value corresponding to the expected life of the insulating material at the high-frequency frequency, and calculate the partial discharge test voltage value of the high-frequency transformer at the power frequency based on the withstand voltage value corresponding to the expected life of the insulating material at the power frequency and the withstand voltage value corresponding to the expected life of the insulating material at the high-frequency frequency.

[0034] Optionally, the withstand voltage test voltage value calculation unit includes:

[0035] The power frequency high frequency conversion factor calculation unit is used to calculate the power frequency high frequency conversion factor using the following formula:

[0036]

[0037] in, is the industrial frequency high frequency conversion factor, is the 1-min withstand voltage value of the insulating material at the high frequency, is the 1-min withstand voltage value of the insulating material at the power frequency;

[0038] The withstand voltage test voltage value calculation unit is used to calculate the 1-min withstand voltage test voltage value of the high-frequency transformer at the high-frequency frequency corresponding to the preset high-frequency voltage using the following formula:

[0039]

[0040] in, For the expected life span corresponding to the withstand voltage value, The highest voltage of the high frequency transformer equipment, It is the standard coefficient of the withstand voltage test of the power frequency transformer;

[0041] The voltage withstand test recommended value determination unit is used to multiply the power frequency high frequency conversion coefficient by the 1min voltage withstand test voltage value to obtain the voltage withstand test value of the high frequency transformer at the power frequency.

[0042] Optionally, the partial discharge test voltage value calculation unit includes:

[0043] The partial discharge test voltage proportionality coefficient calculation unit is used to calculate the power frequency high frequency partial discharge test voltage proportionality coefficient using the following formula:

[0044]

[0045] in, is the power frequency high frequency partial discharge test voltage proportionality coefficient, The withstand voltage value corresponding to the expected service life of the insulating material at the power frequency, is the withstand voltage value corresponding to the expected service life of the insulating material at the high frequency;

[0046] The partial discharge test voltage value determination unit is used to calculate the partial discharge test voltage value of the high-frequency transformer at the power frequency using the following formula:

[0047]

[0048] in, is the partial discharge test voltage value of the high-frequency transformer at the power frequency, It is the voltage value of the partial discharge measurement test performed on the insulating material under the preset measurement time.

[0049] A test device for a high-frequency transformer test voltage, comprising a memory and a processor;

[0050] The memory is used to store programs;

[0051] The processor is used to execute the program to implement the various steps of the test method for the high-frequency transformer test voltage as described above.

[0052] A storage medium stores a computer program, which, when executed by a processor, implements the various steps of the test method for high-frequency transformer test voltage as described above.

[0053] By means of the above technical scheme, the present application performs an external withstand voltage test on the insulating material of the high-frequency transformer to obtain the relationship between the breakdown voltage and the withstand voltage time of the insulating material at each frequency, and obtains the 1-minute withstand voltage value of the insulating material at the high frequency and the power frequency based on the relationship, so as to calculate the recommended value of the withstand voltage test voltage of the high-frequency transformer at the power frequency, and obtains the recommended value of the partial discharge test voltage of the high-frequency transformer at the power frequency through the partial discharge test. It can be seen that the recommended value of the withstand voltage test voltage measured by the external withstand voltage test can be closer to the voltage stress distribution under the actual working conditions, and effectively evaluate the withstand voltage capacity of the insulating structure under high-frequency operating conditions. The recommended value of the partial discharge test voltage measured by the partial discharge test can truly reflect the discharge characteristics and degradation trend of the insulating material during high-frequency operation, thereby more reliably evaluating the insulation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0055] Figure 1 A schematic diagram of a flow chart for implementing a high-frequency transformer test voltage test provided in an embodiment of the present application;

[0056] Figure 2 A schematic diagram of a power frequency-high frequency withstand voltage test platform provided in an embodiment of the present application;

[0057] Figure 3 A schematic diagram of a ball-plate electrode model provided in an embodiment of the present application;

[0058] Figure 4 A schematic diagram of a partial discharge experimental platform provided in an embodiment of the present application;

[0059] Figure 5 A graph showing the Vt characteristic curve of polyimide at different voltage frequencies provided in an embodiment of the present application;

[0060] Figure 6 A schematic diagram of the structure of a device for implementing a high-frequency transformer test voltage test provided in an embodiment of the present application;

[0061] Figure 7 A schematic diagram of the structure of a device for implementing a high-frequency transformer test voltage test provided in an embodiment of the present application. DETAILED DESCRIPTION

[0062] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0063] The present application solution can be implemented based on a terminal with data processing capabilities, which can be a computer, server, cloud, etc.

[0064] Next, combine Figure 1 The test method of the high-frequency transformer test voltage of the present application may include the following steps:

[0065] Step S110: Perform an external withstand voltage test on the insulating material of the high-frequency transformer at multiple frequencies to obtain the relationship between the breakdown voltage and withstand voltage time of the insulating material at each frequency.

[0066] The multiple frequencies may include a power frequency and a high frequency frequency. The power frequency may be 50 Hz, and the high frequency frequency may be 10 kHz, 20 kHz, 30 kHz or 40 kHz. The component of the insulating material may be polyimide.

[0067] Specifically, the external voltage withstand test of the insulation material of the high-frequency transformer requires the construction of a power frequency and high frequency voltage withstand test platform. Figure 2 As shown, the ball plate electrode and the sample are immersed in insulating oil to reduce the interference of factors such as air partial discharge. The insulating oil is Karamay No. 25 transformer oil. The measuring electrode is as follows Figure 3 As shown, the ball electrode has a diameter of 20 mm, the plate electrode is 10 mm thick and 75 mm in diameter. The electrode holder is made of a transparent insulating plate, which is convenient for observing the changes of the sample during the experiment. The industrial frequency power supply is composed of a voltage regulating console and an experimental transformer, and the high-frequency source power supply is composed of a high-frequency high-voltage power supply, and a high-power current-limiting resistor is connected in series.

[0068] Build a polyimide partial discharge experimental platform such as Figure 4 As shown, the high-frequency high-voltage power supply output waveform peak-to-peak value is 0~20kV continuously adjustable sinusoidal voltage, and the frequency is 10k~50kHz continuously adjustable; the ETS-93686 high-frequency pulse current sensor has a bandwidth of 10kHz~100MHz, which is used to collect PD signals; the oscilloscope is used to display and record partial discharge signals. The polyimide film is 75um thick and 40•40mm in size. It is wiped with anhydrous alcohol before the experiment and placed in a vacuum drying oven at 70℃ for 24h to remove surface moisture.

[0069] The improved VMD algorithm is used to decompose the PD signal. The Equilibrium Optimizer (EO) algorithm is used to optimize the decomposition number K and the penalty factor α. The kurtosis criterion is used to determine the effective component. The wavelet threshold denoising is used to further remove the residual white noise of the reconstructed signal.

[0070] For the 1min external withstand voltage test voltage measurement, the ambient temperature during the withstand voltage test was maintained at room temperature 25°C, the ambient relative humidity was 20%, and the short-time breakdown voltage Us of polyimide was measured by the uniform voltage increase method. The voltage increase rate was set to 0.5kV / s, and 70%Us~95%Us was selected as the voltage value. The breakdown time data of polyimide materials at power frequency (50Hz) and high frequency (10k~40kHz) were obtained through constant voltage experiments, and the Vt curve of breakdown voltage and withstand voltage time was plotted as shown in the figure. Figure 5 As shown. Figure 5It can be seen that with the increase of the frequency of the external applied voltage, the breakdown voltage of the polyimide film decreases. The breakdown voltage of the polyimide film under the industrial frequency is 11.67 kV, and the high-frequency breakdown voltages of 10 kHz-40 kHz are 5.65 kV, 5.30 kV, 4.89 kV, and 4.21 kV, respectively, which are all less than 0.5 times that under the industrial frequency. This is because the polarization process of the material under the high-frequency electric field cannot respond to the frequency change in time, resulting in the polarization of the material failing to keep up with the change of the external electric field, and the internal electric field distribution becomes more uneven. In addition, the dielectric loss of the material under the high-frequency electric field increases, resulting in an increase in the internal temperature of the material. Under the action of electrothermal coupling, the breakdown strength of the polyimide film decreases.

[0071] At the power frequency of 50Hz, the breakdown voltage V 0 is 11.67555kv, the aging life n is 0.01596, and the Vt expression is , at a high frequency of 10kHz, the breakdown voltage V 0 is 5.52771kv, the aging life n is 0.01735, and the Vt expression is , at a high frequency of 20kHz, the breakdown voltage V 0 is 5.34614kv, the aging life n is 0.02442, and the Vt expression is , at a high frequency of 30kHz, the breakdown voltage V 0 is 4.91334kv, the aging life n is 0.03263, and the Vt expression is , at a high frequency of 40kHz, the breakdown voltage V 0 is 4.26532kv, the aging life n is 0.03633, and the Vt expression is .

[0072] It can be seen that V 0 It corresponds well to the breakdown voltage measured in the experiment. The aging life index n reflects the rate at which the withstand voltage performance changes over time. The aging life index increases with the increase of voltage frequency, indicating that the faster the breakdown voltage decreases over time, the more significant the aging process of the polyimide film increases with the increase of voltage frequency. According to the national standard GB / T1094.3-2017 Power Transformer Part 3: Insulation Level, Insulation Test and External Insulation Air Gap, the external withstand voltage test is to verify the AC voltage withstand strength of the winding insulation. During the test, all terminals of the remaining windings are grounded. The withstand voltage test waveform is a single AC voltage as close to a sine wave as possible, and the pressurization time is 1 minute.

[0073] Step S120: According to the relationship, the 1-min withstand voltage value of the insulating material at the high frequency is obtained, and the 1-min withstand voltage value of the insulating material at the power frequency is determined.

[0074] Specifically, based on the sinusoidal power frequency and high frequency voltage Vt characteristics of the insulating material under the ball-plate electrode model, the power frequency and high frequency 1 min withstand voltage level of the insulating material is obtained.

[0075] Step S130, calculating a withstand voltage test voltage value of the high-frequency transformer at the power frequency based on the 1-min withstand voltage value of the insulating material at the high frequency and the 1-min withstand voltage value of the insulating material at the power frequency.

[0076] Specifically, the power frequency high frequency conversion factor can be calculated using the following formula:

[0077]

[0078] in, is the industrial frequency high frequency conversion factor, is the 1-min withstand voltage value of the insulating material at the high frequency, It is the 1-min withstand voltage value of the insulating material at the power frequency.

[0079] The 1-min withstand voltage test voltage value of the high-frequency transformer at the high-frequency frequency corresponding to the preset high-frequency voltage can be calculated using the following formula:

[0080]

[0081] in, For the expected life span corresponding to the withstand voltage value, The highest voltage of the high frequency transformer equipment, is the standard coefficient of the withstand voltage test of the power frequency transformer, Depending on the insulation level and design standard of the equipment, the value can be between 1.5-2.5.

[0082] Furthermore, the power frequency to high frequency conversion coefficient is multiplied by the 1 min withstand voltage test voltage value to obtain the withstand voltage test voltage value of the high frequency transformer at the power frequency.

[0083] Specifically, the voltage value of the withstand voltage test of the high-frequency transformer at the power frequency can be calculated using the following formula:

[0084]

[0085] in, It is the test voltage value of the high-frequency transformer's withstand voltage test at the industrial frequency.

[0086] It is understandable that when a high-frequency transformer is subjected to an external withstand voltage test under power frequency conditions, the withstand voltage test voltage value can be closer to the voltage stress distribution under actual working conditions and effectively evaluate the withstand voltage capability of the insulation structure under high-frequency operating conditions. The withstand voltage test voltage value can avoid insulation aging or premature breakdown due to excessive voltage, thereby more truly reflecting the actual withstand voltage level of the transformer. Based on the test results, the selection of insulation materials and structural design can be improved in a targeted manner to improve the overall withstand voltage performance of the high-frequency transformer.

[0087] Step S140: Determine the withstand voltage value corresponding to the expected service life of the insulating material at the power frequency according to the relationship, and determine the withstand voltage value corresponding to the expected service life of the insulating material at the high frequency.

[0088] Specifically, based on the Vt characteristic test results of the insulating material, the withstand voltage value corresponding to the expected service life of 20 years can be used as a reference.

[0089] Step S150, calculating the partial discharge test voltage value of the high-frequency transformer at the power frequency based on the withstand voltage value corresponding to the expected life of the insulating material at the power frequency and the withstand voltage value corresponding to the expected life of the insulating material at the high frequency.

[0090] Specifically, the power frequency high frequency partial discharge test voltage proportionality coefficient is calculated using the following formula:

[0091]

[0092] in, is the power frequency high frequency partial discharge test voltage proportionality coefficient, The withstand voltage value corresponding to the expected service life of the insulating material at the power frequency, is the withstand voltage value corresponding to the expected service life of the insulating material at the high frequency.

[0093] The partial discharge test voltage value of the high-frequency transformer at the power frequency can be calculated using the following formula:

[0094]

[0095] in, is the partial discharge test voltage value of the high-frequency transformer at the power frequency, It is the voltage value of the partial discharge measurement test performed on the insulating material under the preset measurement time.

[0096] Specifically, According to the standard GB1094.3-2017 "Power Transformer Part 3: Insulation Level, Insulation Test and External Insulation Air Gap", you can choose The partial discharge measurement is carried out with a voltage of 300s.

[0097] It is understandable that when measuring partial discharge of high-frequency transformers under power frequency conditions, the use of partial discharge test voltage values ​​can more effectively stimulate local defects in the transformer insulation system, which helps to accurately characterize the partial discharge behavior and defect properties. The partial discharge test voltage value can truly reflect the discharge characteristics and degradation trend of the insulating material during high-frequency operation, thereby more reliably evaluating the insulation performance. The use of a unified partial discharge test voltage value can make the partial discharge data of different samples or under different operating conditions more comparable, which helps to establish a standardized evaluation system. In terms of the life prediction of the insulation state, the measurement results of partial discharge can serve as an important basis for transformer life prediction, and the test data under reasonable voltage conditions can improve the accuracy of the life prediction model.

[0098] The test method for the test voltage of the high-frequency transformer provided in this embodiment performs an external withstand voltage test on the insulating material of the high-frequency transformer to obtain the relationship between the breakdown voltage and the withstand voltage time of the insulating material at each frequency, and obtains the 1-minute withstand voltage value of the insulating material at the high frequency and the power frequency based on the relationship, so as to calculate the recommended value of the withstand voltage test voltage of the high-frequency transformer at the power frequency, and obtains the recommended value of the partial discharge test voltage of the high-frequency transformer at the power frequency through a partial discharge test. It can be seen that the recommended value of the withstand voltage test voltage measured by the external withstand voltage test can be closer to the voltage stress distribution under the actual working conditions, and effectively evaluate the withstand voltage capacity of the insulating structure under high-frequency operating conditions. The recommended value of the partial discharge test voltage measured by the partial discharge test can truly reflect the discharge characteristics and degradation trend of the insulating material during high-frequency operation, thereby more reliably evaluating the insulation performance.

[0099] The following is a description of an apparatus for implementing a high-frequency transformer test voltage test provided in an embodiment of the present application. The apparatus for implementing a high-frequency transformer test voltage test described below and the method for implementing a high-frequency transformer test voltage test described above can be referenced to each other.

[0100] See also Figure 6 , Figure 6 A schematic diagram of the structure of a device for testing a high-frequency transformer test voltage disclosed in an embodiment of the present application.

[0101] like Figure 6 As shown, the device may include:

[0102] The voltage-time relationship measurement unit 11 is used to perform an external withstand voltage test on the insulating material of the high-frequency transformer at multiple frequencies to obtain the relationship between the breakdown voltage and the withstand voltage time of the insulating material at each frequency, wherein the multiple frequencies include power frequency and high frequency frequency;

[0103] A withstand voltage test value calculation unit 12 is used to obtain the 1-min withstand voltage value of the insulating material at the high frequency according to the relationship, and determine the 1-min withstand voltage value of the insulating material at the power frequency, and calculate the withstand voltage test voltage value of the high-frequency transformer at the power frequency based on the 1-min withstand voltage value of the insulating material at the high frequency and the 1-min withstand voltage value of the insulating material at the power frequency;

[0104] The partial discharge test voltage value calculation unit 13 is used to determine the withstand voltage value corresponding to the expected life of the insulating material at the power frequency according to the relationship, and determine the withstand voltage value corresponding to the expected life of the insulating material at the high-frequency frequency, and calculate the partial discharge test voltage value of the high-frequency transformer at the power frequency based on the withstand voltage value corresponding to the expected life of the insulating material at the power frequency and the withstand voltage value corresponding to the expected life of the insulating material at the high-frequency frequency.

[0105] Optionally, the withstand voltage test voltage value calculation unit includes:

[0106] The power frequency high frequency conversion factor calculation unit is used to calculate the power frequency high frequency conversion factor using the following formula:

[0107]

[0108] in, is the industrial frequency high frequency conversion factor, is the 1-min withstand voltage value of the insulating material at the high frequency, is the 1-min withstand voltage value of the insulating material at the power frequency;

[0109] The withstand voltage test voltage value calculation unit is used to calculate the 1-min withstand voltage test voltage value of the high-frequency transformer at the high-frequency frequency corresponding to the preset high-frequency voltage using the following formula:

[0110]

[0111] in, For the expected life span corresponding to the withstand voltage value, The highest voltage of the high frequency transformer equipment, It is the standard coefficient of the withstand voltage test of the power frequency transformer;

[0112] The voltage withstand test recommended value determination unit is used to multiply the power frequency high frequency conversion coefficient by the 1min voltage withstand test voltage value to obtain the voltage withstand test value of the high frequency transformer at the power frequency.

[0113] Optionally, the partial discharge test voltage value calculation unit includes:

[0114] The partial discharge test voltage proportionality coefficient calculation unit is used to calculate the power frequency high frequency partial discharge test voltage proportionality coefficient using the following formula:

[0115]

[0116] in, is the power frequency high frequency partial discharge test voltage proportionality coefficient, The withstand voltage value corresponding to the expected service life of the insulating material at the power frequency, is the withstand voltage value corresponding to the expected service life of the insulating material at the high frequency;

[0117] The partial discharge test voltage value determination unit is used to calculate the partial discharge test voltage value of the high-frequency transformer at the power frequency using the following formula:

[0118]

[0119] in, is the partial discharge test voltage value of the high-frequency transformer at the power frequency, It is the voltage value of the partial discharge measurement test performed on the insulating material under the preset measurement time.

[0120] The device for testing the test voltage of a high-frequency transformer provided in the embodiment of the present application can be applied to equipment for testing the test voltage of a high-frequency transformer, such as a terminal: a computer, a server, etc. Optionally, Figure 7 The hardware structure diagram of the equipment for testing the high-frequency transformer test voltage is shown in FIG. Figure 7 The hardware structure of the device for testing the test voltage of a high-frequency transformer may include: at least one processor 1, at least one communication interface 2, at least one memory 3 and at least one communication bus 4;

[0121] In the embodiment of the present application, the number of the processor 1, the communication interface 2, the memory 3, and the communication bus 4 is at least one, and the processor 1, the communication interface 2, and the memory 3 communicate with each other through the communication bus 4;

[0122] The processor 1 may be a central processing unit CPU, or an application-specific integrated circuit ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of the present invention, etc.;

[0123] The memory 3 may include a high-speed RAM memory, and may also include a non-volatile memory, such as at least one disk memory;

[0124] The memory stores a program, and the processor can call the program stored in the memory, wherein the program is used to:

[0125] Under multiple frequencies, an external withstand voltage test is performed on the insulating material of the high-frequency transformer to obtain the relationship between the breakdown voltage and the withstand voltage time of the insulating material under each frequency, wherein the multiple frequencies include power frequency and high-frequency frequency;

[0126] According to the relationship, the 1-min withstand voltage value of the insulating material at the high frequency is obtained, and the 1-min withstand voltage value of the insulating material at the power frequency is determined, and based on the 1-min withstand voltage value of the insulating material at the high frequency and the 1-min withstand voltage value of the insulating material at the power frequency, the withstand voltage test voltage value of the high-frequency transformer at the power frequency is calculated;

[0127] According to the relationship, the withstand voltage value corresponding to the expected life of the insulating material at the power frequency is determined, and the withstand voltage value corresponding to the expected life of the insulating material at the high-frequency frequency is determined; and based on the withstand voltage value corresponding to the expected life of the insulating material at the power frequency and the withstand voltage value corresponding to the expected life of the insulating material at the high-frequency frequency, the partial discharge test voltage value of the high-frequency transformer at the power frequency is calculated.

[0128] Optionally, the detailed functions and extended functions of the program may refer to the above description.

[0129] The embodiment of the present application further provides a storage medium, which may store a program suitable for execution by a processor, wherein the program is used to:

[0130] Under multiple frequencies, an external withstand voltage test is performed on the insulating material of the high-frequency transformer to obtain the relationship between the breakdown voltage and the withstand voltage time of the insulating material under each frequency, wherein the multiple frequencies include power frequency and high-frequency frequency;

[0131] According to the relationship, the 1-min withstand voltage value of the insulating material at the high frequency is obtained, and the 1-min withstand voltage value of the insulating material at the power frequency is determined, and based on the 1-min withstand voltage value of the insulating material at the high frequency and the 1-min withstand voltage value of the insulating material at the power frequency, the withstand voltage test voltage value of the high-frequency transformer at the power frequency is calculated;

[0132] According to the relationship, the withstand voltage value corresponding to the expected life of the insulating material at the power frequency is determined, and the withstand voltage value corresponding to the expected life of the insulating material at the high-frequency frequency is determined; and based on the withstand voltage value corresponding to the expected life of the insulating material at the power frequency and the withstand voltage value corresponding to the expected life of the insulating material at the high-frequency frequency, the partial discharge test voltage value of the high-frequency transformer at the power frequency is calculated.

[0133] Optionally, the detailed functions and extended functions of the program may refer to the above description.

[0134] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0135] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The various embodiments can be combined as needed, and the same or similar parts can refer to each other.

[0136] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for testing a high-frequency transformer test voltage, characterized in that: include: Under multiple frequencies, an external withstand voltage test is performed on the insulating material of the high-frequency transformer to obtain the relationship between the breakdown voltage and the withstand voltage time of the insulating material under each frequency, wherein the multiple frequencies include power frequency and high-frequency frequency; According to the relationship, the 1-min withstand voltage value of the insulating material at the high frequency is obtained, and the 1-min withstand voltage value of the insulating material at the power frequency is determined, and based on the 1-min withstand voltage value of the insulating material at the high frequency and the 1-min withstand voltage value of the insulating material at the power frequency, the withstand voltage test voltage value of the high-frequency transformer at the power frequency is calculated; According to the relationship, the withstand voltage value corresponding to the expected life of the insulating material at the power frequency is determined, and the withstand voltage value corresponding to the expected life of the insulating material at the high-frequency frequency is determined; and based on the withstand voltage value corresponding to the expected life of the insulating material at the power frequency and the withstand voltage value corresponding to the expected life of the insulating material at the high-frequency frequency, the partial discharge test voltage value of the high-frequency transformer at the power frequency is calculated.

2. The method according to claim 1, characterized in that Calculating the withstand voltage test voltage value of the high-frequency transformer at the power frequency according to the 1-min withstand voltage value of the insulating material at the high frequency and the 1-min withstand voltage value of the insulating material at the power frequency, including: Use the following formula to calculate the power frequency high frequency conversion factor: in, is the industrial frequency high frequency conversion factor, is the 1-min withstand voltage value of the insulating material at the high frequency, is the 1-min withstand voltage value of the insulating material at the power frequency; The 1-minute withstand voltage test voltage value of the high-frequency transformer at the high-frequency frequency corresponding to the preset high-frequency voltage is calculated using the following formula: in, For the expected life span corresponding to the withstand voltage value, The highest voltage of the high frequency transformer equipment, It is the standard coefficient of the withstand voltage test of the power frequency transformer; The power frequency high frequency conversion coefficient is multiplied by the 1 min withstand voltage test voltage value to obtain the withstand voltage test voltage value of the high frequency transformer at the power frequency.

3. The method according to claim 1, characterized in that Calculating the partial discharge test voltage value of the high-frequency transformer at the power frequency based on the withstand voltage value corresponding to the expected life of the insulating material at the power frequency and the withstand voltage value corresponding to the expected life of the insulating material at the high frequency frequency, including: Use the following formula to calculate the power frequency high frequency partial discharge test voltage proportionality coefficient: in, is the power frequency high frequency partial discharge test voltage proportionality coefficient, The withstand voltage value corresponding to the expected service life of the insulating material at the power frequency, is the withstand voltage value corresponding to the expected service life of the insulating material at the high frequency; The partial discharge test voltage value of the high-frequency transformer at the power frequency is calculated using the following formula: in, is the partial discharge test voltage value of the high-frequency transformer at the power frequency, It is the voltage value of the partial discharge measurement test performed on the insulating material under the preset measurement time.

4. The method according to any one of claims 1 to 3, characterized in that: The power frequency is 50 Hz, and the high frequency is 10 kHz, 20 kHz, 30 kHz or 40 kHz.

5. The method according to any one of claims 1 to 3, characterized in that: The insulating material is composed of polyimide.

6. A test device for high-frequency transformer test voltage, characterized in that: include: A voltage-time relationship measurement unit, used to perform an external withstand voltage test on the insulating material of the high-frequency transformer at multiple frequencies to obtain the relationship between the breakdown voltage and the withstand voltage time of the insulating material at each frequency, wherein the multiple frequencies include power frequency and high-frequency frequency; A withstand voltage test value calculation unit for a withstand voltage test, configured to obtain the 1-min withstand voltage value of the insulating material at the high frequency according to the relationship, determine the 1-min withstand voltage value of the insulating material at the power frequency, and calculate the withstand voltage test voltage value of the high-frequency transformer at the power frequency based on the 1-min withstand voltage value of the insulating material at the high frequency and the 1-min withstand voltage value of the insulating material at the power frequency; The partial discharge test voltage value calculation unit is used to determine the withstand voltage value corresponding to the expected life of the insulating material at the power frequency according to the relationship, and determine the withstand voltage value corresponding to the expected life of the insulating material at the high-frequency frequency, and calculate the partial discharge test voltage value of the high-frequency transformer at the power frequency based on the withstand voltage value corresponding to the expected life of the insulating material at the power frequency and the withstand voltage value corresponding to the expected life of the insulating material at the high-frequency frequency.

7. The device according to claim 6, characterized in that The withstand voltage test voltage value calculation unit comprises: The power frequency high frequency conversion factor calculation unit is used to calculate the power frequency high frequency conversion factor using the following formula: in, is the industrial frequency high frequency conversion factor, is the 1-min withstand voltage value of the insulating material at the high frequency, is the 1-min withstand voltage value of the insulating material at the power frequency; The withstand voltage test voltage value calculation unit is used to calculate the 1-min withstand voltage test voltage value of the high-frequency transformer at the high-frequency frequency corresponding to the preset high-frequency voltage using the following formula: in, For the expected life span corresponding to the withstand voltage value, The highest voltage of the high frequency transformer equipment, It is the standard coefficient of the withstand voltage test of the power frequency transformer; The voltage withstand test recommended value determination unit is used to multiply the power frequency high frequency conversion coefficient by the 1min voltage withstand test voltage value to obtain the voltage withstand test value of the high frequency transformer at the power frequency.

8. The device according to claim 6, characterized in that The partial discharge test voltage value calculation unit comprises: The partial discharge test voltage proportionality coefficient calculation unit is used to calculate the power frequency high frequency partial discharge test voltage proportionality coefficient using the following formula: in, is the power frequency high frequency partial discharge test voltage proportionality coefficient, The withstand voltage value corresponding to the expected service life of the insulating material at the power frequency, is the withstand voltage value corresponding to the expected service life of the insulating material at the high frequency; The partial discharge test voltage value determination unit is used to calculate the partial discharge test voltage value of the high-frequency transformer at the power frequency using the following formula: in, is the partial discharge test voltage value of the high-frequency transformer at the power frequency, It is the voltage value of the partial discharge measurement test performed on the insulating material under the preset measurement time.

9. A test device for high-frequency transformer test voltage, characterized in that: including memory and processor; The memory is used to store programs; The processor is used to execute the program to implement the various steps of the high-frequency transformer test voltage testing method as described in any one of claims 1-5.

10. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, each step of the method for testing the test voltage of a high-frequency transformer as described in any one of claims 1 to 5 is implemented.

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