Wave fin detection device and wave fin detection method

Abstract

The invention discloses a wave fin detection device and a wave fin detection method. The wave fin detection device comprises an air compressor, a pressure control device, a multifunctional valve group, a displacement detection device and a displacement analysis device, and the air compressor is used for compressing input gas into test gas and transmitting the test gas to the pressure control device; the pressure control equipment is used for adjusting the pressure of the test gas flowing through the pressure control equipment and outputting the test gas for providing preset test pressure to the to-be-tested fully-sealed distribution transformer; the multifunctional valve group is used for connecting the to-be-tested fully-sealed distribution transformer and controlling the to-be-tested fully-sealed distribution transformer to exhaust; the displacement detection device is used for measuring the final size of the wave fin of the to-be-detected fully-sealed distribution transformer after the to-be-detected fully-sealed distribution transformer finishes exhausting; and the displacement analysis device is used for determining the deformation proportion of the wave fin according to the final size and the original size of the wave fin and evaluating the performance of the wave fin according to the deformation proportion.

Description

Technical Field

[0001] This application relates to the field of transformer testing, and more specifically, to a device and method for detecting fins. Background Technology

[0002] As a key component of fully sealed distribution transformers, the breathing effect of the transformer oil fins in the tank is crucial for compensating for changes in transformer oil volume caused by temperature fluctuations and alleviating internal pressure increases. However, the relevant technologies lack methods for evaluating the breathing effect of the fins in fully sealed distribution transformers, making it impossible to effectively monitor and quantify the elastic performance and fatigue life of the fins.

[0003] There is currently no effective solution to the above problems. Summary of the Invention

[0004] This application provides a device and method for detecting corrugated fins, in order to at least solve the technical problem that the performance of corrugated fins cannot be quantitatively evaluated due to the lack of a method for evaluating the breathing effect of corrugated fins in fully sealed distribution transformers.

[0005] According to one aspect of the embodiments of this application, a corrugated fin detection device is provided, comprising: an air compressor, a pressure control device, a multi-functional valve group, a displacement detection device, and a displacement analysis device. The air compressor is used to compress input gas into test gas and transmit the test gas to the pressure control device. The pressure control device is used to adjust the pressure of the test gas flowing through the pressure control device and output test gas to a fully sealed distribution transformer under test to provide a preset test pressure. The multi-functional valve group is used to connect to the fully sealed distribution transformer under test and control the exhaust of the fully sealed distribution transformer under test. The displacement detection device is used to measure the final size of the corrugated fins of the fully sealed distribution transformer under test after the transformer under test has completed exhaust. The displacement analysis device is used to determine the deformation ratio of the corrugated fins based on the final size and the original size of the corrugated fins, and to evaluate the performance of the corrugated fins based on the deformation ratio.

[0006] Optionally, the pressure control device includes: a first pressure regulating valve, a first cavity, a second pressure regulating valve, and a second cavity, wherein the first pressure regulating valve is used to receive test gas transmitted from the air compressor and store the received test gas in the first cavity until the pressure of the test gas stored in the first cavity reaches a first preset pressure, at which point the first pressure regulating valve closes, wherein the first preset pressure is greater than a preset test pressure; the second pressure regulating valve is used to receive test gas transmitted from the first cavity and store the received test gas in the second cavity until the pressure of the test gas stored in the second cavity reaches a second preset pressure, at which point the second pressure regulating valve closes, wherein the second preset pressure is greater than the preset test pressure and less than the first preset pressure.

[0007] Optionally, the pressure control device further includes an electrically controlled inflation valve, wherein the electrically controlled inflation valve is used to transfer the test gas in the second cavity to the fully sealed distribution transformer under test until the pressure of the test gas stored in the fully sealed distribution transformer under test reaches the preset test pressure, at which point the electrically controlled inflation valve closes.

[0008] Optionally, the second pressure regulating valve is an electronic pressure regulating valve, which includes a diaphragm. After the test gas is input into the second cavity, the diaphragm moves in the direction of closing the second pressure regulating valve. When the pressure of the test gas input into the second cavity reaches a second preset pressure, the second pressure regulating valve closes.

[0009] Optionally, the pressure control device also includes a filter, wherein the filter is used to filter out oil, moisture and other particulate matter in the test gas delivered by the air compressor.

[0010] Optionally, the multi-functional valve assembly includes: an electrically controlled exhaust valve, a pressure sensor, and a control system. The pressure sensor is used to detect the internal pressure of the fully sealed distribution transformer under test and convert the internal pressure of the fully sealed distribution transformer under test into an electrical signal. When the internal pressure of the fully sealed distribution transformer under test is less than the preset test pressure, the sensor outputs a first electrical signal to the control system. The first electrical signal is used to control the electrically controlled exhaust valve to close.

[0011] Optionally, in a cyclic testing scenario, the pressure sensor is also used to output a second electrical signal to the control system when the pressure inside the fully sealed distribution transformer under test is equal to the preset test pressure. The second electrical signal is used to control the opening of the electrically controlled exhaust valve, which is used to discharge the test gas inside the fully sealed distribution transformer under test.

[0012] Optionally, the testing device also includes a timing device, used to determine the duration for which the internal pressure of the fully sealed distribution transformer under test is maintained at a preset test pressure when the test scenario is a single test, and to control the exhaust of the fully sealed distribution transformer under test through a multi-functional valve group when the preset duration is reached.

[0013] According to another aspect of the embodiments of this application, a method for detecting corrugated fins is also provided, comprising: receiving a test gas, adjusting the pressure of the test gas, and outputting the test gas to the fully sealed distribution transformer under test for providing a preset test pressure; determining the final size of the corrugated fins of the fully sealed distribution transformer under test after the test gas is discharged; and determining the performance of the corrugated fins based on the final size and the original size of the corrugated fins.

[0014] Optionally, in a cyclic test scenario, when the pressure inside the fully sealed distribution transformer under test reaches the preset test pressure, the test gas is vented from the fully sealed distribution transformer under test; in a single test scenario, when the pressure inside the fully sealed distribution transformer under test remains at the preset test pressure for a preset duration, the test gas is vented from the fully sealed distribution transformer under test.

[0015] In this embodiment, a fin detection device is provided, comprising: an air compressor, a pressure control device, a multi-functional valve group, a displacement detection device, and a displacement analysis device. The air compressor compresses input gas into test gas and transmits the test gas to the pressure control device. The pressure control device adjusts the pressure of the test gas flowing through it and outputs test gas to the fully sealed distribution transformer under test to provide a preset test pressure. The multi-functional valve group connects to the fully sealed distribution transformer under test and controls its exhaust. The displacement detection device measures the displacement of the fins of the fully sealed distribution transformer under test after exhaust. Final dimensions; displacement analysis device, used to determine the deformation ratio of the corrugated fins based on the final dimensions and the original dimensions of the corrugated fins, and to evaluate the performance of the corrugated fins based on the deformation ratio; by inflating the fully sealed distribution transformer with gas and then controlling the degassing of the fully sealed distribution transformer after inflation, the breathing of the corrugated fins of the fully sealed distribution transformer is simulated. The elastic performance of the corrugated fins is evaluated based on the original dimensions of the corrugated fins before inflation and the final dimensions of the corrugated fins after inflation and degassing. This achieves the purpose of simulating the breathing of the corrugated fins with gas, thereby improving the accuracy of evaluating the elastic performance of the corrugated fins. This solves the technical problem of being unable to quantify the performance evaluation of the corrugated fins due to the lack of a method to evaluate the breathing effect of the corrugated fins of fully sealed distribution transformers. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0017] Figure 1 This is a schematic diagram of a performance testing device for a wave fin according to an embodiment of this application;

[0018] Figure 2 This is a schematic diagram illustrating the working principle of a wave fin detection device according to an embodiment of this application;

[0019] Figure 3 This is a cross-sectional view of a second pressure regulating valve 124 according to an embodiment of this application;

[0020] Figure 4This is a flowchart of a method for detecting fins according to an embodiment of this application. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0022] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0023] To better understand the embodiments of this application, the technical terms involved in the embodiments of this application are explained below:

[0024] Wave fins: Heat sinks are a special structural design on the outer wall of a transformer tank; the wave fins are arranged in a wave-like pattern along the outer surface of the tank, increasing the heat dissipation area of ​​the tank.

[0025] Breathing of the fins: The elastic deformation process in which the fins expand and contract as the volume of oil in the tank changes.

[0026] To prevent oxidation and moisture absorption of transformer oil, fully sealed distribution transformers are commonly used. The oil tank of a fully sealed distribution transformer is a key component, primarily relying on the "breathing" effect of its valves—the elastic deformation of the valves—to compensate for changes in transformer oil volume caused by temperature fluctuations, thereby mitigating the rise in internal pressure. In related technologies, the breathing effect of the valves is simulated by filling the tank of a fully sealed distribution transformer with oil, and the performance of the valves is evaluated based on the elastic deformation caused by oil temperature changes. However, the oil can corrode the valves, leading to low accuracy of the test results, and the test cycle is long, resulting in long testing time and low efficiency. To address these issues, this application provides relevant solutions, which are detailed below.

[0027] This application provides a device for testing the performance of wave fins. Figure 1 This is a schematic diagram of the performance testing device for wave fins provided in the embodiments of this application, as shown below. Figure 1 As shown, the performance testing device for the corrugated fins includes: an air compressor 10, a pressure control device 12, a multi-functional valve group 14, a displacement detection device 16, and a displacement analysis device 18. The air compressor 10 compresses the input gas into test gas and transmits the test gas to the pressure control device 12. The pressure control device 12 adjusts the pressure of the test gas flowing through it and outputs test gas to the fully sealed distribution transformer 100 under test to provide a preset test pressure. The multi-functional valve group 14 connects to the fully sealed distribution transformer 100 under test and controls its exhaust. The displacement detection device 16 measures the final dimensions of the corrugated fins of the fully sealed distribution transformer 100 after exhaust. The displacement analysis device 18 determines the deformation ratio of the corrugated fins based on the final dimensions and the original dimensions of the corrugated fins, and evaluates the performance of the corrugated fins based on the deformation ratio.

[0028] The device for testing the corrugated fin performance provided in this embodiment simulates the "breathing" of the corrugated fins of the fully sealed distribution transformer 100 under test by charging and degassing the transformer. This allows for fatigue testing of the corrugated fins. The air compressor 10 can be an ultra-quiet reciprocating compressor, which is a type of positive displacement compressor. It utilizes the movement of the piston to change the volume of the compression chamber, thereby compressing the gas. The input gas into the air compressor 10 can be atmospheric pressure or other gases. In this embodiment, the air compressor 10 serves as a test gas source, providing the test gas to charge the fully sealed distribution transformer 100 under test. During the simulated breathing process of the fins of the fully sealed distribution transformer 100 under test, the breathing of the fins is completed by the pressure control device 12 and the multi-functional valve group 14. Specifically, the pressure control device 12 inflates the fully sealed distribution transformer 100 under test until the internal pressure of the fully sealed distribution transformer 100 under test reaches the preset test pressure, and then stops inflating; the multi-functional valve group 14 completes the deflating of the fully sealed distribution transformer 100 under test; a complete inflation + deflation process is equivalent to the fins performing one breath. When performing fatigue tests on the fully sealed distribution transformer 100 under test using the fin performance testing device provided in this application embodiment, the deformation of the fin is determined based on the size of the fin after the fully sealed distribution transformer 100 is inflated (i.e., the final size) and the size of the fin before the fully sealed distribution transformer 100 is inflated (i.e., the original size). The performance of the fin is evaluated based on the ratio of the deformation to the original size (i.e., the deformation ratio). The size of the fin before the fully sealed distribution transformer 100 is inflated (i.e., the original size) and the size of the fin after the inflated period (i.e., the final size) are measured by the displacement detection device 16. The displacement detection device 16 includes a high-precision displacement measuring instrument, such as a digital display instrument with a measuring range of 0 to 20 mm, a measuring accuracy of ±0.02 mm, and a reading accuracy of 0.01 mm, which is an internal and external caliper wall thickness measuring instrument with an external caliper gauge. The displacement analysis device 18 is used to determine the deformation ratio of the corrugated fins of the fully sealed distribution transformer 100 under test after fatigue testing based on the original and final dimensions of the corrugated fins, and to evaluate the performance of the corrugated fins of the fully sealed distribution transformer 100 under test based on the deformation ratio. For example, if the maximum deformation ratio is preset to 10%, then if the deformation ratio of the corrugated fins is greater than 10% after the above simulation test, it indicates that the elastic performance of the corrugated fins is unqualified; if the deformation ratio of the corrugated fins is less than or equal to 10% after the above simulation test, it indicates that the elastic performance of the corrugated fins is unqualified. In actual use, corrugated fins with unqualified elastic performance will undergo permanent deformation before the specified maximum number of uses is reached, resulting in the oil tank being unable to dissipate heat.

[0029] Optionally, the pressure control device 12 includes: a first pressure regulating valve 120, a first cavity 122, a second pressure regulating valve 124, and a second cavity 126. The first pressure regulating valve 120 receives test gas from an air compressor and stores the received test gas in the first cavity 122 until the pressure of the test gas stored in the first cavity 122 reaches a first preset pressure, at which point the first pressure regulating valve 120 closes. The first preset pressure is greater than a preset test pressure. The second pressure regulating valve 124 receives test gas from the first cavity 122 and stores the received test gas in the second cavity 126 until the pressure of the test gas stored in the second cavity 126 reaches a second preset pressure, at which point the second pressure regulating valve 124 closes. The second preset pressure is greater than the preset test pressure and less than the first preset pressure.

[0030] Figure 2 This is a schematic diagram illustrating the working principle of a corrugated fin testing device, such as... Figure 2As shown, in this embodiment, the pressure control device 12 uses compressed air output from the air compressor 10 as the gas source to regulate the pressure of the passing test gas. The pressure control device 12 performs two-stage pressure regulation: a first-stage pressure regulating valve for coarse pressure regulation and a second-stage pressure regulating valve for high-precision pressure regulation. In this embodiment, the first pressure regulating valve 120 serves as the first-stage pressure regulating valve, and the second pressure regulating valve 124 serves as the second-stage pressure regulating valve. The test gas output from the air compressor 10 is first passed to the first pressure regulating valve 120, which is responsible for reducing the pressure of the high-pressure gas from the compressor. The first pressure regulating valve 120... Pressure reduction is achieved by storing test gas in the first cavity 122. The volume of the first cavity 122 is fixed. When the first cavity 122 is filled with gas, the first pressure regulating valve 120 closes. Therefore, the volume of test gas stored in the first cavity 122 is fixed, and the pressure provided by the test gas (i.e., the first preset pressure) is fixed. For example, in this embodiment, the test gas stored in the first cavity 122 is fixed to provide a pressure of 2 standard atmospheres (2 bar) (1 bar = 100 kPa), and the pressure value is locked and does not need to be adjusted during operation. Therefore, when the exhaust pressure of the air compressor 10 is 8 bar and the exhaust gas volume is 155 nanoliters per minute (nL / min), the first pressure regulating valve 120 can reduce the pressure of the input test gas (8 bar) to 2 bar. The test gas stored in the first cavity 122 will serve as the gas source for the secondary pressure regulating valve (second pressure regulating valve 124). After the first-stage pressure control, the gas is transferred from the first cavity 122 to the second cavity 126 via the second pressure regulating valve 124 for further pressure reduction. In this embodiment, the second pressure regulating valve 124 is a high-precision electrically controlled pressure regulating valve. Therefore, the second pressure regulating valve 124 can precisely adjust the output pressure according to the received instructions, ensuring that the test gas stored in the second cavity 126 meets the gas quantity required for fatigue testing. For example, a pressure regulating range of 5–100 kPa can be selected. When a high-precision electronic pressure regulating valve with a pressure accuracy of ±0.5 kPa is used as the second pressure regulating valve 124, the output pressure range of the second pressure regulating valve 124 can be controlled from 5 kPa to 100 kPa based on a current signal of 4–20 mA. The pressure (i.e., the second preset pressure) of the test gas stored in the second cavity 126 is controlled by the second pressure regulating valve 124. For example, when the output pressure of the second pressure regulating valve 124 is 15 kPa, the second pressure regulating valve 124 closes when the pressure of the test gas stored in the second cavity 126 reaches 15 kPa. In this embodiment, graded pressure regulation not only improves the pressure control accuracy but also enhances the safety of the detection device. For example, if the first-stage pressure regulating valve malfunctions, the second-stage pressure regulating valve can, to a certain extent, prevent excessive system pressure and protect downstream equipment from damage.

[0031] According to some optional embodiments of this application, the pressure control device 12 further includes an electrically controlled inflation valve 128, wherein the electrically controlled inflation valve is used to transfer the test gas in the second cavity 126 to the fully sealed distribution transformer 100 under test until the pressure of the test gas stored in the fully sealed distribution transformer 100 under test reaches the preset test pressure, at which point the electrically controlled inflation valve 128 closes.

[0032] Still Figure 2 As shown, the pressure control device also includes an electrically controlled inflation valve 128. The electrically controlled inflation valve 128 is used to maintain the pressure inside the fully sealed distribution transformer 100 under test, keeping the internal air pressure at a preset test pressure. The test gas stored in the second cavity 126 is input into the interior of the fully sealed distribution transformer 100 under test through the electrically controlled inflation valve 128. When the pressure gauge detects that the real-time pressure inside the fully sealed distribution transformer 100 under test reaches the preset test pressure, the electrically controlled inflation valve closes, thus maintaining the pressure of the fully sealed distribution transformer 100 under test. The electrically controlled inflation valve 128 can be a direct-acting solenoid valve. The on / off state of the direct-acting solenoid valve is controlled by a control voltage. For example, the opening and closing of the electrically controlled inflation valve can be controlled by a 24-volt (V) voltage, thereby controlling the on / off state of the air source output pipeline of the pressure control device 12.

[0033] According to some optional embodiments of this application, the second pressure regulating valve 124 is an electronic pressure regulating valve. Figure 3 This is a cross-sectional view of the second pressure regulating valve 124, as shown below. Figure 3 As shown, the electronic pressure regulating valve (second pressure regulating valve 124) includes: a diaphragm ③, wherein, after the test gas is input into the second cavity 126, the diaphragm ③ moves in the direction of closing the second pressure regulating valve 124, and the second pressure regulating valve 124 closes when the pressure of the test gas input into the second cavity 126 reaches the second preset pressure.

[0034] like Figure 2 As shown, the pressure control device also includes a pressure gauge and a pressure sensor. The pressure gauge and pressure sensor are used to collect and display the pressure of the input gas. Simultaneously, the pressure sensor can convert the pressure signal into a current signal and transmit it to the control system. In this embodiment, the method described above, which controls the output pressure range of the second pressure regulating valve 124 to 5kPa to 100kPa based on a 4-20mA current signal, can be implemented in conjunction with the pressure gauge and pressure sensor included in the pressure control device 12. Specifically, the current signal output by the pressure sensor is used as the input signal of the second pressure regulating valve 124. The control circuit inside the second pressure regulating valve 124 controls the amount of gas allowed to pass through the second pressure regulating valve 124 according to the magnitude of the current signal, thereby achieving the technical effect of adjusting the output pressure range of the second pressure regulating valve 124. The following is a combination of... Figure 3Explain the working principle of the high-precision electronic pressure regulating valve (second pressure regulating valve 124), such as... Figure 3 As shown, the second pressure regulating valve 124 includes: a pilot valve ①, a pilot chamber ②, a diaphragm ③, an air supply valve ④, an exhaust valve ⑤, and a controller ⑥. When the output pressure of the second pressure regulating valve 124 is lower than the set pressure, the controller ⑥ controls the pilot valve ① to open. At this time, the input pressure acts on the pilot chamber ② through the pilot valve ①, and the diaphragm ③ descends. As a result, the air supply valve ④, which is linked to the diaphragm ③, opens, and part of the input pressure becomes the output pressure, increasing the output pressure. If, during the process of filling the second cavity 126 with air through the second pressure regulating valve 124, too much air is filled into the second cavity 126 through the output pressure, causing the output pressure of the second pressure regulating valve 124 to be higher than the second preset pressure, the controller ⑥ controls the pilot valve ① to close. The pressure in the pilot chamber ② is vented through the pilot valve ①, and the diaphragm ③ rises. As a result, the air supply valve ④, which is linked to the diaphragm ③, closes, the exhaust valve ⑤ opens, and the output pressure is vented through the exhaust port, reducing the output pressure to the second preset pressure. In this embodiment, when the output pressure is the second preset pressure (the second preset pressure is between 5 kPa and 100 kPa, and can be set according to the actual situation), the second pressure regulating valve 124 is closed.

[0035] Optionally, the pressure control device 12 further includes a filter 1210, wherein the filter 1210 is used to filter oil, moisture and other particulate matter in the test gas transmitted by the air compressor 10.

[0036] like Figure 2 As shown, the inlet of the first pressure regulating valve 120 is equipped with an air source filter 1210. The air source filter 1210 is a combination filter, whose main function is to remove impurities (such as particulate matter in the air), moisture and oil mist from the compressed air source, so as to ensure the cleanliness of the compressed air source and extend the service life of downstream components.

[0037] According to some optional embodiments of this application, the multi-functional valve group 14 includes: an electrically controlled exhaust valve 140, a pressure sensor 142, and a control system 144. The pressure sensor 142 is used to detect the pressure inside the fully sealed distribution transformer 100 under test and convert the pressure inside the fully sealed distribution transformer 100 under test into an electrical signal. When the pressure inside the fully sealed distribution transformer 100 under test is less than the preset test pressure, it outputs a first electrical signal to the control system 144, wherein the first electrical signal is used to control the electrically controlled exhaust valve 140 to close.

[0038] In this embodiment, the electrically controlled exhaust valve 140 and the electrically controlled inflation valve 128 in the pressure control device 12 automatically switch their respective switching modes to realize the inflation and deflation of the fully sealed distribution transformer 100 under test, simulate the breathing of the fins of the fully sealed distribution transformer 100 under test, and evaluate the life of the fins. The state of the electrically controlled exhaust valve 140, whether it is open or closed, can be determined by the pressure sensor 142 and the control system 144 in the multi-functional valve group 14. The pressure sensor 142 in the multi-functional valve group 14 is used to collect and display the real-time pressure inside the fully sealed distribution transformer 100 under test. At the same time, the pressure sensor 142 can convert the pressure signal into a current signal (i.e., an electrical signal), and the control system 144 in the multi-functional valve group 14 controls the opening and closing of the electrically controlled inflation valve 128 according to the electrical signal. For example, when the pressure sensor 142 detects that the pressure inside the fully sealed distribution transformer 100 under test is less than the preset test pressure, it is still necessary to continue to inflate the fully sealed distribution transformer 100 under test. At this time, the pressure sensor 142 converts the detected pressure into a (first) electrical signal. After receiving the first electrical signal, the control system will control the electrically controlled exhaust valve 140 to close.

[0039] Optionally, in the scenario of a cyclic test, the pressure sensor 142 is also used to output a second electrical signal to the control system 144 when the pressure inside the fully sealed distribution transformer 100 under test is equal to the preset test pressure. The second electrical signal is used to control the opening of the electrically controlled exhaust valve 140, which is used to discharge the test gas inside the fully sealed distribution transformer 100 under test.

[0040] The fin detection device provided in this application embodiment can be used to select different test scenarios when conducting fatigue tests on the fins. The pressure holding requirements of the fully sealed distribution transformer 100 under test vary depending on the test scenario. In this embodiment, there is no pressure holding requirement when the test scenario is cyclic testing. Cyclic testing requires the fully sealed distribution transformer 100 under test to be repeatedly charged and discharged multiple times; for example, 1,000 charge-discharge cycles are performed, with one charge and one discharge constituting one cycle. In this embodiment, during the charging process of the fully sealed distribution transformer 100 under test, the second pressure regulating valve 124 adjusts the output pressure according to the preset test pressure, the electrically controlled charging valve 128 opens, and the fully sealed distribution transformer 100 under test is pressurized (i.e., charged). When the pressure gauge detects that the real-time pressure inside the fully sealed distribution transformer 100 under test reaches the preset test pressure, the electrically controlled charging valve 128 closes, and the charging process ends. At this time, the pressure sensor 142 detects the preset test pressure and converts it into an electrical signal (i.e., the second electrical signal). After receiving the second electrical signal, the control system 144 directly controls the electrically controlled exhaust valve 140 connected to the fully sealed distribution transformer 100 under test to open, thereby venting the test gas inside the fully sealed distribution transformer 100. After all the test gas is vented, the venting is completed. Since the amplitude of the electrical signal obtained by the pressure sensor 142 from the converted pressure value is different when the pressure value is different, the amplitude of the electrical signal used to control the opening of the electrically controlled exhaust valve 140 (i.e., the second electrical signal) is different from the amplitude of the electrical signal used to control the closing of the electrically controlled exhaust valve 140 (i.e., the first electrical signal). The control system 144 can determine whether to open or close the electrically controlled exhaust valve 140 by identifying the amplitude of the electrical signal.

[0041] like Figure 2 As shown, in some embodiments, the multi-functional valve group 14 also includes a safety relief valve. The safety relief valve is set with a corresponding start pressure, for example, it can be set to 35 kPa. During the test, when the pressure inside the fully sealed distribution transformer 100 under test exceeds the start pressure value, the safety relief valve automatically opens to release pressure and ensure the pressure safety of the fully sealed distribution transformer.

[0042] According to some optional embodiments of this application, the detection device for the wave fins further includes: a timing device 110, used to determine the duration for which the internal pressure of the fully sealed distribution transformer 100 under test is maintained at a preset test pressure when the test scenario is a single test, and to control the exhaust of the fully sealed distribution transformer 100 under test through the multi-functional valve group 14 when the preset duration is reached.

[0043] The fin detection device provided in this application embodiment also supports single-test scenarios. In a single-test scenario, when performing fatigue testing on the fully sealed distribution transformer 100 under test, after inflating the fully sealed distribution transformer 100, a pressure-holding operation is performed, maintaining the internal pressure of the fully sealed distribution transformer 100 at a preset test pressure for a preset duration. After the pressure-holding operation is completed, the test gas inside the fully sealed distribution transformer 100 is vented. In this embodiment, the timing device 110 can detect the duration for which the internal pressure of the fully sealed distribution transformer 100 is maintained at the preset test pressure. When the pressure-holding duration reaches the preset duration (e.g., 1 hour), the multi-functional valve group 14 is activated, and the electrically controlled exhaust valve 140 in the multi-functional valve group 14 releases the gas from the fully sealed distribution transformer 100.

[0044] The requirements for pressurizing the fully sealed distribution transformer 100 under test in the single test and the cyclic test are also different. That is, the preset test pressure is different in different test scenarios. In the single test scenario, the internal pressure of the fully sealed distribution transformer 100 under test is required to be 30 kPa; in the cyclic test scenario, the internal pressure of the fully sealed distribution transformer 100 under test is required to be 15 kPa. The preset test pressure can be adjusted by the output pressure of the second pressure regulating valve 124.

[0045] According to an embodiment of this application, a method embodiment for testing the performance of a waveguide is also provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0046] Figure 4 This is a flowchart of a method for detecting fins according to an embodiment of this application, as shown below. Figure 4 As shown, the detection method for wave fins includes the following steps:

[0047] Step S402: Receive test gas, adjust the pressure of the test gas, and output test gas to the fully sealed distribution transformer under test to provide a preset test pressure.

[0048] The method for detecting corrugated fins provided in this application simulates the pressure changes during the thermal expansion and contraction of the oil inside a fully sealed distribution transformer by charging and degassing the transformer. This simulates fatigue testing of the fully sealed distribution transformer, and the performance of the corrugated fins is evaluated based on the changes in their dimensions after the fatigue test. In step S402, the pressure control device receives test gas from the gas source device and adjusts the flow of the test gas so that the output test gas provides the required test pressure (i.e., the preset test pressure) for testing the corrugated fins in the fully sealed distribution transformer under test.

[0049] For example, an air compressor is used as the gas source device. The air compressor compresses the input gas (such as atmospheric pressure) to a test gas pressure of 8 bar and outputs it to the pressure control device. The pressure control device uses two pressure regulating valves to achieve staged pressure regulation. The first-stage pressure regulating valve is a high-precision manual pressure regulating valve (i.e., the first pressure regulating valve 120), which reduces the 8 bar gas source pressure to 2 bar to serve as the gas source for the second-stage high-precision electronically controlled pressure regulating valve (i.e., the second pressure regulating valve 124). The outlet pressure of the high-precision manual pressure regulating valve is 2 bar, and the pressure value is locked. The second-stage pressure regulating valve (i.e., the second pressure regulating valve 124) is configured with a high-precision electronic pressure regulating valve for pressure regulation output. Based on a 4-20mA current signal, its output pressure range can be controlled from 5kPa to 100kPa to provide a preset test pressure for the fully sealed distribution transformer under test. The pressure control device does not require adjustment during operation. The air inlet of the high-precision manual pressure regulating valve (i.e., the first pressure regulating valve 120) can be equipped with an air source filter, a pressure gauge, and a pressure sensor. The air source filter is a combined filter, mainly used to remove impurities, moisture, and oil mist from the compressed air source, ensuring the cleanliness of the compressed air source and extending the service life of downstream components. The pressure gauge and pressure sensor are used to collect and display the air source pressure. Simultaneously, the pressure sensor can convert the pressure signal into a current signal and transmit it to the control system for controlling the opening and closing of the second pressure regulating valve 124. A pressure gauge is installed at the outlet of the high-precision manual pressure regulating valve for displaying the manual pressure adjustment pressure of the first-stage valve, facilitating control of the outlet pressure of the high-precision manual pressure regulating valve. An electrically controlled air charging valve 128 is installed at the outlet of the second-stage high-precision electrically controlled pressure regulating valve (i.e., the second pressure regulating valve 124) for pressure maintenance. This electrically controlled air charging valve 128 ensures that the internal pressure of the fully sealed distribution transformer under test is always maintained at the preset test pressure when pressure maintenance is required.

[0050] Step S404: Determine the final dimensions of the corrugations of the fully sealed distribution transformer under test after the test gas is discharged.

[0051] As mentioned in the above embodiments, in addition to filling the fully sealed distribution transformer under test with gas during the fatigue test, the test gas inside the fully sealed distribution transformer under test is also discharged after the filling is completed. The venting of the fully sealed distribution transformer under test can be achieved through a multi-functional valve group 14 connected to the fully sealed distribution transformer under test. The multi-functional valve group 14 includes an electrically controlled venting valve 140. The electrically controlled venting valve and the electrically controlled filling valve in the pressure control device automatically switch on and off, realizing repeated filling and venting inside the fully sealed distribution transformer, simulating the breathing condition of the fins of the fully sealed distribution transformer. In step S404, during the fatigue test of the fully sealed distribution transformer under test, after all the test gas filled into the fully sealed distribution transformer under test is discharged, the size (i.e., the final size) of the fins of the fully sealed distribution transformer under test is determined using a displacement detection device. The displacement detection device can be a measuring instrument with a measurement accuracy of ±0.02mm and a reading accuracy of 0.01mm. The higher the measurement accuracy of the displacement detection device, the more accurately it can capture the subtle dimensional changes of the fins before and after the fatigue test.

[0052] Step S406: Determine the performance of the wave fins based on the final dimensions and the original dimensions of the wave fins.

[0053] In step S406, the performance of the fins is evaluated by combining the original dimensions of the fins before the first inflation of the fully sealed distribution transformer under test with the final dimensions of the fins obtained in step S404. Specifically, the deformation of the fins after fatigue testing is determined based on the original and final dimensions of the fins. The ratio of the deformation to the original dimensions is determined as the deformation ratio of the fins, and the performance of the fins of the fully sealed distribution transformer under test is evaluated based on the deformation ratio. For example, if the maximum deformation ratio is preset to 10%, then if the deformation ratio of the fins after the above simulation test is greater than 10%, it indicates that the elastic performance of the fins is unqualified; if the deformation ratio of the fins after the above simulation test is less than or equal to 10%, it indicates that the elastic performance of the fins is unqualified. In actual use, fins with unqualified elastic performance will undergo permanent deformation before reaching the specified maximum number of uses, resulting in the inability of the oil tank to dissipate heat.

[0054] According to some optional embodiments of this application, in a cyclic test scenario, when the pressure inside the fully sealed distribution transformer under test reaches the preset test pressure, the test gas is vented from the fully sealed distribution transformer under test; in a single test scenario, when the pressure inside the fully sealed distribution transformer under test remains at the preset test pressure for a preset duration, the test gas is vented from the fully sealed distribution transformer under test.

[0055] The fin detection method provided in this application can be used in different testing scenarios, where the pressure holding requirements differ. In this embodiment, when the testing scenario is a cyclic test, there is no pressure holding requirement; the test gas inside the fully sealed distribution transformer under test is vented when the internal pressure reaches the preset test pressure. However, when the testing scenario is a single test, it is required that after the internal pressure of the fully sealed distribution transformer under test reaches the preset test pressure, the pressure inside the fully sealed distribution transformer under test be maintained at the preset test pressure for a preset duration before the test gas is vented. Furthermore, the preset test pressure also differs under different testing scenarios.

[0056] It should be noted that, Figure 4 Preferred embodiments of the shown examples can be found in [reference needed]. Figure 1 The relevant descriptions of the embodiments shown will not be repeated here.

[0057] Through the above steps, the breathing of the wave fins can be simulated by inflating and deflating. Fatigue testing of the wave fins can be completed based on inflation and deflation. Precise pressure control improves the accuracy of the test results, adapts to more test scenarios, improves the usability of the method, and avoids damage to the equipment under test caused by using oil for wave fin fatigue testing.

[0058] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0059] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0060] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0061] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0062] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0063] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to related technologies, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0064] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A device for detecting wavy lines, characterized in that, include: Air compressor, pressure control equipment, multi-functional valve assembly, displacement detection device, and displacement analysis device, among which, The air compressor is used to compress the input gas into test gas and transmit the test gas to the pressure control device; The pressure control device is used to adjust the pressure of the test gas flowing through the pressure control device and output test gas to the fully sealed distribution transformer under test to provide a preset test pressure. The multi-functional valve group is used to connect the fully sealed distribution transformer under test and control the exhaust of the fully sealed distribution transformer under test. The displacement detection device is used to measure the final size of the fins of the fully sealed distribution transformer under test after the venting process is completed. The displacement analysis device is used to determine the deformation ratio of the wave fin based on the final size and the original size of the wave fin, and to evaluate the performance of the wave fin based on the deformation ratio.

2. The apparatus according to claim 1, characterized in that, The pressure control device includes: a first pressure regulating valve, a first cavity, a second pressure regulating valve, and a second cavity, wherein, The first pressure regulating valve is used to receive the test gas transmitted by the air compressor, store the received test gas in the first cavity, and close the first pressure regulating valve when the pressure of the test gas stored in the first cavity reaches a first preset pressure, wherein the first preset pressure is greater than the preset test pressure. The second pressure regulating valve is used to receive the test gas transmitted from the first cavity and store the received test gas in the second cavity until the pressure of the test gas stored in the second cavity reaches the second preset pressure, at which point the second pressure regulating valve closes, wherein the second preset pressure is greater than the preset test pressure and less than the first preset pressure.

3. The apparatus according to claim 2, characterized in that, The pressure control device further includes: an electrically controlled inflation valve, wherein... The electrically controlled inflation valve is used to transfer the test gas in the second cavity to the fully sealed distribution transformer under test until the pressure of the test gas stored in the fully sealed distribution transformer under test reaches the preset test pressure, at which point the electrically controlled inflation valve closes.

4. The apparatus according to claim 2, characterized in that, The second pressure regulating valve is an electronic pressure regulating valve, which includes a diaphragm, wherein, After the test gas is input into the second cavity, the diaphragm moves in the direction of closing the second pressure regulating valve. When the pressure of the test gas input into the second cavity reaches the second preset pressure, the second pressure regulating valve closes.

5. The apparatus according to claim 1, characterized in that, The pressure control device further includes a filter, wherein the filter is used to filter oil, moisture and other particulate matter in the test gas transmitted by the air compressor.

6. The apparatus according to claim 1, characterized in that, The multi-functional valve assembly includes: an electrically controlled exhaust valve, a pressure sensor, and a control system. The pressure sensor is used to detect the pressure inside the fully sealed distribution transformer under test and convert the pressure inside the fully sealed distribution transformer under test into an electrical signal. When the pressure inside the fully sealed distribution transformer under test is less than the preset test pressure, a first electrical signal is output to the control system, wherein the first electrical signal is used to control the electrically controlled exhaust valve to close.

7. The apparatus according to claim 6, characterized in that, In a cyclic testing scenario, the pressure sensor is further configured to output a second electrical signal to the control system when the pressure inside the fully sealed distribution transformer under test equals the preset test pressure. This second electrical signal is used to control the opening of the electrically controlled exhaust valve. The electrically controlled exhaust valve is used to discharge the test gas inside the fully sealed distribution transformer under test.

8. The apparatus according to claim 1, characterized in that, The detection device also includes a timing device, used to determine the duration for which the internal pressure of the fully sealed distribution transformer under test is maintained at the preset test pressure when the test scenario is a single test, and to control the exhaust of the fully sealed distribution transformer under test through the multi-functional valve group when the preset duration is reached.

9. A method for detecting fins, characterized in that, include: Receive test gas, adjust the pressure of the test gas, and output test gas to the fully sealed distribution transformer under test to provide a preset test pressure; Determine the final size of the corrugations of the fully sealed distribution transformer under test after the test gas is discharged; The performance of the wave fin is determined based on the final dimensions and the original dimensions of the wave fin.

10. The method according to claim 9, characterized in that, In a cyclic testing scenario, when the pressure inside the fully sealed distribution transformer under test reaches the preset test pressure, the test gas is vented from the fully sealed distribution transformer under test. In a single-test scenario, if the internal pressure of the fully sealed distribution transformer under test is maintained at the preset test pressure for a preset duration, the test gas is vented from the fully sealed distribution transformer under test.

Images