An explosion-proof film testing system and method for a transformer

Abstract

The present invention discloses an explosion-proof film testing system and method for transformers, belonging to the technical field of explosion-proof film detection. The system includes a control module, a pressure adjustment module, a temperature adjustment module, a vibration table, and a test container; the test container is arranged on the vibration table, and the test container is used to place at least one explosion-proof film to be tested; the control end of the control module is respectively connected to the controlled end of the pressure adjustment module, the controlled end of the temperature adjustment module, and the control end of the vibration table; the air outlet of the pressure adjustment module is connected to the test container, and the temperature adjustment module is arranged inside the test container. By means of the pressure adjustment module, the temperature adjustment module, and the vibration table, the present invention can realize the coupling of pressure factors, temperature factors, and vibration factors, and can complete the aging test of the explosion-proof film under multiple environmental factors, so as to effectively test the aging resistance performance of the explosion-proof film.

Description

Technical Field

[0001] The present invention relates to the technical field of explosion-proof film detection, and particularly to an explosion-proof film test system and method for transformers. Background Art

[0002] During the operation of an oil-immersed transformer, if an arc fault occurs, various flammable gases will be generated, increasing the internal pressure of the oil tank. When the pressure exceeds the allowable pressure of the transformer oil tank, the transformer oil tank will explode, causing the flammable gases and the high-temperature transformer oil to come into contact with oxygen, resulting in combustion and explosion. To improve the explosion-proof ability of the transformer oil tank, an explosion-proof film type pressure relief device is usually set in the transformer at present, and the explosion-proof film is one of the important components of the explosion-proof film type pressure relief device, and its anti-aging performance is an important index to ensure its long-term operation stability.

[0003] In the prior art, the explosion-proof film test device for transformers usually can only achieve the aging test of the explosion-proof film under a single environmental factor, and the test factors are incomplete, resulting in poor test results of the explosion-proof film and unable to effectively test the anti-aging performance of the explosion-proof film. Summary of the Invention

[0004] The present invention provides an explosion-proof film test system and method for transformers to solve the technical problem that the explosion-proof film test device for transformers in the prior art cannot effectively test the anti-aging performance of the explosion-proof film due to the single test factor considered.

[0005] To solve the above technical problem, in the first aspect of the embodiments of the present invention, an explosion-proof film test system for transformers is provided, including a control module, a pressure adjustment module, a temperature adjustment module, a vibration table, and a test container;

[0006] The test container is arranged on the vibration table, and the test container is used to place at least one explosion-proof film to be tested; the control end of the control module is respectively connected to the controlled end of the pressure adjustment module, the controlled end of the temperature adjustment module, and the control end of the vibration table; the air outlet of the pressure adjustment module is connected to the test container, and the temperature adjustment module is arranged in the test container.

[0007] As a preferred solution, the test container is further used to place a test medium, the test medium is compressed air, water, or transformer oil, and when the test medium is water or transformer oil, the test medium submerges the temperature adjustment module.

[0008] As a preferred solution, the pressure adjustment module includes an air compressor, a solenoid valve, a pressure stabilizing tank, and a pressure sensor;

[0009] The gas output end of the air compressor is connected to the air inlet of the pressure stabilizing tank through the solenoid valve. The air outlet of the pressure stabilizing tank is connected to the test container through a gas pipe. The pressure sensor is arranged on the gas pipe, and the output end of the pressure sensor is connected to the pressure monitoring end of the control module. The control end of the control module is connected to the controlled end of the solenoid valve to transmit the compressed air generated by the air compressor into the pressure stabilizing tank.

[0010] As a preferred solution, the temperature adjustment module includes a heating unit and a temperature sensor;

[0011] The heating unit is arranged inside the test container. The temperature sensor is attached to the inner surface of the explosion-proof film to be tested. The output end of the temperature sensor is connected to the temperature monitoring end of the control module. The control end of the control module is connected to the controlled end of the heating unit.

[0012] As a preferred solution, the test container includes a plurality of explosion-proof film containers arranged in layers. The explosion-proof film containers are used to place the explosion-proof film to be tested. The air outlet of the pressure adjustment module is respectively connected to each explosion-proof film container, and the temperature adjustment module is arranged in each explosion-proof film container.

[0013] As a preferred solution, the explosion-proof film container includes a chassis, a top cover, an outer ring member and a clamping and fixing component;

[0014] The outer ring member is arranged on the chassis, the top cover is arranged on the top of the outer ring member. An accommodation cavity for placing the explosion-proof film to be tested is formed inside the outer ring member. The clamping and fixing component is arranged in the accommodation cavity, and the clamping and fixing component is used to fix the explosion-proof film to be tested in the accommodation cavity.

[0015] As a preferred solution, the clamping and fixing component includes a rubber ring, a first spring member, a first clamping piece, a second spring member and a second clamping piece;

[0016] The rubber ring, the first spring member and the second spring member are all arranged on the chassis. The bottom of the first clamping piece is connected to the first spring member. The bottom of the second clamping piece is connected to the second spring member. And the first clamping piece and the second clamping piece are both located above the rubber ring;

[0017] A perforation is arranged on the chassis. The rubber ring is arranged outside the perforation. When the explosion-proof film to be tested is placed in the accommodation cavity, the outer surface of the explosion-proof film to be tested is located above the perforation and on the top of the rubber ring. The first clamping piece and the second clamping piece are respectively arranged on the inner surface of the explosion-proof film to be tested.

[0018] As a preferred solution, a plurality of through holes are provided on the chassis; the through holes on the chassis of two adjacent explosion-proof film containers are connected by a support rod.

[0019] As a preferred solution, a plurality of jacks are provided on the tabletop of the vibration table, and the tabletop of the vibration table is connected to the bottom of the test container by a plurality of support columns, and one end of the support column is connected to the bottom of the test container, and the other end of the support column is inserted into the jack.

[0020] As a preferred solution, a plurality of baffles are provided on the tabletop of the vibration table, and the baffles are arranged outside the test container.

[0021] A second aspect of the embodiments of the present invention provides an explosion-proof film test method for a transformer, which is applied to the explosion-proof film test system for a transformer as described in any item of the first aspect, and includes:

[0022] According to a preset test pressure, test temperature, test vibration frequency, and / or test vibration acceleration, and according to a preset test duration, the control module controls the pressure adjustment module, the temperature adjustment module, and / or the vibration table to perform an aging test on at least one explosion-proof film to be tested placed in the test container;

[0023] When the explosion-proof film to be tested completes the aging test, detect the bursting pressure of the explosion-proof film to be tested;

[0024] According to the bursting pressure and the calibrated bursting pressure, obtain the aging resistance performance test result of the explosion-proof film to be tested.

[0025] As a preferred solution, the pressure adjustment module includes an air compressor, a solenoid valve, a pressure stabilizing tank, and a pressure sensor;

[0026] Then, the method further includes:

[0027] During the aging test of the explosion-proof film to be tested, obtain the real-time pressure transmitted by the pressure sensor through the control module;

[0028] When it is detected that the real-time pressure is less than the test pressure, control the solenoid valve to open through the control module to increase the pressure in the test container to the test pressure.

[0029] As a preferred solution, the temperature adjustment module includes a heating unit and a temperature sensor, and the temperature sensor is attached to the inner surface of the explosion-proof film to be tested;

[0030] Then, the method further includes:

[0031] During the aging test of the explosion-proof film to be tested, obtain the real-time temperature transmitted by the temperature sensor through the control module;

[0032] When it is detected that the real-time temperature is lower than the test temperature, the control module controls the heating unit to increase the power, so as to raise the temperature of the inner surface of the explosion-proof film to be tested to the test temperature.

[0033] As a preferred solution, obtaining the aging resistance test result of the explosion-proof film to be tested according to the bursting pressure and the calibrated bursting pressure specifically includes:

[0034] Calculating the relative error of the bursting pressure according to the bursting pressure and the calibrated bursting pressure;

[0035] When the calibrated bursting pressure is 0.01 MPa to 0.1 MPa and the relative error is 0 to 25%, it is determined that the aging resistance test result is good aging resistance;

[0036] When the calibrated bursting pressure is 0.1 MPa to 0.3 MPa and the relative error is 0 to 15%, it is determined that the aging resistance test result is good aging resistance;

[0037] When the calibrated bursting pressure is 0.3 MPa to 100 MPa and the relative error is 0 to 5%, it is determined that the aging resistance test result is good aging resistance.

[0038] Compared with the prior art, the beneficial effect of the embodiment of the present invention is that through the pressure adjustment module, the temperature adjustment module and the vibration table, the coupling of the pressure factor, the temperature factor and the vibration factor can be realized, the aging test of the explosion-proof film under multiple environmental factors can be completed, and thus the aging resistance performance of the explosion-proof film can be effectively tested. Description of the Drawings

[0039] Figure 1 is the overall structural schematic diagram of the explosion-proof film test system for a transformer in the embodiment of the present invention;

[0040] Figure 2 is the overall structural schematic diagram of the explosion-proof film container in the embodiment of the present invention;

[0041] Figure 3 is the internal structural schematic diagram of the explosion-proof film container in the embodiment of the present invention;

[0042] Figure 4 is the structural schematic diagram of the clamping and fixing assembly in the embodiment of the present invention;

[0043] Figure 5 is the flow schematic diagram of the explosion-proof film test method for a transformer in the embodiment of the present invention;

[0044] Among them, 1. Control module; 2. Test container; 201. Explosion-proof film container; 3. Shaking table; 4. Air compressor; 5. Pressure stabilizing tank; 6. Chassis; 7. Outer ring part; 8. Top cover; 9. Explosion-proof film to be tested; 10. Heating unit; 11. First clamping piece; 12. Second clamping piece; 13. Rubber ring; 14. First spring piece; 15. Second spring piece; 16. Support rod; 17. Support pillar. Detailed implementation manner

[0045] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection scope of the present invention.

[0046] Please refer to Figure 1 , the first aspect of the embodiment of the present invention provides an explosion-proof film test system for a transformer, including a control module 1, a pressure adjustment module, a temperature adjustment module, a shaking table 3 and a test container 2;

[0047] The test container 2 is arranged on the shaking table 3, and the test container 2 is used to place at least one explosion-proof film 9 to be tested; the control end of the control module 1 is respectively connected to the controlled end of the pressure adjustment module, the controlled end of the temperature adjustment module, and the control end of the shaking table 3; the air outlet of the pressure adjustment module is connected to the test container 2, and the temperature adjustment module is arranged in the test container 2.

[0048] Specifically, the pressure adjustment module in this embodiment is used to introduce the pressure influence factor in the aging process of the explosion-proof film during the aging test, the temperature adjustment module is used to introduce the temperature influence factor in the aging process of the explosion-proof film during the aging test, and the shaking table 3 is used to introduce the vibration influence factor in the aging process of the explosion-proof film during the aging test. In addition, the control module 1 is used to control the pressure adjustment module, the temperature adjustment module and the shaking table 3 respectively, so that when performing the aging test of the explosion-proof film, it is possible to introduce one of the influence factors to realize the aging test under a single environmental factor, and it is also possible to introduce multiple influence factors to realize the aging test under multiple environmental factors.

[0049] Furthermore, the test container 2 in this embodiment can place at least one explosion-proof film 9 to be tested, so that it is possible to perform the aging test on multiple explosion-proof films simultaneously, significantly improving the efficiency of the aging test.

[0050] As one of the preferred embodiments, the above-mentioned vibrating table 3 is specifically a three-dimensional vibrating table, which is driven by electromagnetic force and can drive the explosion-proof film 9 to be tested in the test container 2 to perform three-dimensional vibration in six directions: up, down, left, right, front, and back.

[0051] The explosion-proof film test system for transformers provided by the embodiments of the present invention can realize the coupling of pressure factors, temperature factors, and vibration factors through the pressure adjustment module, temperature adjustment module, and vibrating table 3, and can complete the aging test of the explosion-proof film under multiple environmental factors, thereby effectively testing the aging resistance performance of the explosion-proof film.

[0052] As a preferred solution, the test container 2 is also used to place a test medium, and the test medium is compressed air, water, or transformer oil. When the test medium is water or transformer oil, the test medium submerges the temperature adjustment module.

[0053] Specifically, in order to further improve the test accuracy of the aging test, the test container 2 in this embodiment is also used to place a test medium, and this test medium acts on the inner side of the explosion-proof film 9 to be tested. Generally, this test medium is compressed air. In order to simulate the action relationship between different media and the explosion-proof film, for example, to simulate the action relationship between transformer oil and the explosion-proof film, the test medium can also be water or transformer oil, or it can also be other liquids, which are not specifically limited in this embodiment. In addition, in order to ensure the test accuracy of the aging test, when the test medium is water or transformer oil, or other liquids, the test medium needs to submerge the temperature adjustment module so that the temperature adjustment module can effectively adjust the temperature of the test medium in the test container 2.

[0054] As a preferred solution, the pressure adjustment module includes an air compressor 4, a solenoid valve, a pressure stabilizing tank 5, and a pressure sensor;

[0055] The gas output end of the air compressor 4 is connected to the air inlet of the pressure stabilizing tank 5 through the solenoid valve. The air outlet of the pressure stabilizing tank 5 is connected to the test container 2 through a conduit. The pressure sensor is arranged on the conduit, and the output end of the pressure sensor is connected to the pressure monitoring end of the control module 1. The control end of the control module 1 is connected to the controlled end of the solenoid valve to transmit the compressed air generated by the air compressor 4 into the pressure stabilizing tank 5.

[0056] Specifically, the air compressor 4 in this embodiment is used to generate compressed air, which is connected to the air inlet of the pressure stabilizing tank 5 through a solenoid valve. The pressure stabilizing tank 5 is used to store the compressed air transmitted from the air compressor 4 for pressure regulation and stabilization, and is connected to the test container 2 through a gas pipe, so as to achieve the purpose of adjusting the pressure in the test container 2. During the aging test process, the control module 1 can control the opening and closing of the solenoid valve to control the pressure in the test container 2, so that the pressure in the test container 2 can be maintained at the preset test pressure.

[0057] In an alternative embodiment, the pressure adjustment range in the test container 2 is from 0.05 MPa to 0.3 MPa, and the pressure adjustment step of the control module 1 is 0.01 MPa.

[0058] As a preferred solution, the temperature adjustment module includes a heating unit 10 and a temperature sensor;

[0059] The heating unit 10 is arranged inside the test container 2, the temperature sensor is attached to the inner surface of the explosion-proof film 9 to be tested, the output end of the temperature sensor is connected to the temperature monitoring end of the control module 1, and the control end of the control module 1 is connected to the controlled end of the heating unit 10.

[0060] Specifically, the heating unit 10 in this embodiment is arranged inside the test container 2 and is used to heat the test medium contained in the test container 2. In order to ensure the test accuracy of the aging test, when the test medium is water, transformer oil, or other liquids, the test medium needs to submerge the heating unit 10, so that the heating unit 10 can effectively adjust the temperature of the test medium in the test container 2. In addition, the controlled end of the heating unit 10 is connected to the control end of the control module 1, so that the control module 1 can control the working power of the heating unit 10 to achieve the purpose of temperature adjustment. Exemplarily, the control module 1 can monitor the temperature of the inner surface of the explosion-proof film based on the temperature sensor, and at the same time control the working power of the heating unit 10. When the temperature is lower than the preset test temperature, control the heating unit 10 to increase the working power; when the temperature reaches the preset test temperature, control the heating unit 10 to reduce the working power to keep the temperature basically unchanged.

[0061] As an alternative embodiment, the heating unit 10 in this embodiment can be a heating sheet, a finned electric heating tube, or other heating devices, and this embodiment does not make specific limitations here.

[0062] In an alternative embodiment, the temperature adjustment range in the test container 2 is from room temperature to 90 °C, and the temperature adjustment step of the control module 1 is 5 °C.

[0063] As a preferred solution, the test container 2 includes a plurality of explosion-proof film containers 201 arranged in layers, the explosion-proof film containers 201 are used to place the explosion-proof film 9 to be tested, the air outlet of the pressure adjustment module is respectively connected to each explosion-proof film container 201, and the temperature adjustment module is arranged in each explosion-proof film container 201.

[0064] Specifically, in this embodiment, the test container 2 is composed of a plurality of explosion-proof film containers 201 arranged in layers, so that aging tests can be carried out on multiple explosion-proof film containers 201 simultaneously. In one embodiment, the pressure adjustment module includes an air compressor 4, a plurality of solenoid valves, a plurality of pressure stabilizing tanks 5 and a plurality of pressure sensors. The compressed air generated by the air compressor 4 is respectively transmitted to each pressure stabilizing tank 5 through each solenoid valve. The air outlet of each pressure stabilizing tank 5 is connected to one of the explosion-proof film containers 201 through a gas pipe, and a pressure sensor is arranged on each gas pipe. In addition, in this embodiment, a temperature adjustment module is arranged in each explosion-proof film container 201, so that the control module 1 can separately adjust the temperature in each explosion-proof film container 201.

[0065] As a preferred solution, the explosion-proof film container 201 includes a chassis 6, a top cover 8, an outer ring member 7 and a clamping and fixing assembly;

[0066] The outer ring member 7 is arranged on the chassis 6, the top cover 8 is arranged on the top of the outer ring member 7, an accommodation cavity for placing the explosion-proof film 9 to be tested is formed inside the outer ring member 7, the clamping and fixing assembly is arranged in the accommodation cavity, and the clamping and fixing assembly is used to fix the explosion-proof film 9 to be tested in the accommodation cavity.

[0067] Specifically, as Figure 2 shown, the explosion-proof film container 201 in this embodiment includes a chassis 6, a top cover 8, an outer ring member 7 and a clamping and fixing assembly. By arranging the outer ring member 7 on the chassis 6 and the top cover 8 on the top of the outer ring member 7, an accommodation cavity for placing the explosion-proof film 9 to be tested can be formed inside the outer ring member 7. In order to prevent the explosion-proof film 9 to be tested from falling off and moving during the aging test, thereby affecting the test accuracy, the clamping and fixing assembly is arranged in the accommodation cavity to fix the explosion-proof film 9 to be tested.

[0068] As a preferred solution, the clamping and fixing assembly includes a rubber ring 13, a first spring member 14, a first clamping piece 11, a second spring member 15 and a second clamping piece 12;

[0069] The rubber ring 13, the first spring member 14, and the second spring member 15 are all provided on the chassis 6. The bottom of the first clamping piece 11 is connected to the first spring member 14, and the bottom of the second clamping piece 12 is connected to the second spring member 15. Moreover, both the first clamping piece 11 and the second clamping piece 12 are located above the rubber ring 13.

[0070] The chassis 6 is provided with a perforation, and the rubber ring 13 is provided outside the perforation. When the explosion-proof film 9 to be tested is placed in the accommodation cavity, the outer surface of the explosion-proof film 9 to be tested is located above the perforation and is provided on the top of the rubber ring 13. The first clamping piece 11 and the second clamping piece 12 are respectively provided on the inner surface of the explosion-proof film 9 to be tested.

[0071] Specifically, as Figure 3 and Figure 4 shown, the clamping and fixing assembly in this embodiment includes a rubber ring 13, a first spring member 14, a first clamping piece 11, a second spring member 15, and a second clamping piece 12. It can be understood that when it is necessary to clamp and fix the explosion-proof film 9 to be tested, first move the first clamping piece 11 and the second clamping piece 12 upward to increase the clamping space between the first clamping piece 11, the second clamping piece 12 and the rubber ring 13, which is convenient for placing the explosion-proof film above the rubber ring 13. Then release the first clamping piece 11 and the second clamping piece 12. At this time, due to the pulling force generated when the first spring member 14 and the second spring member 15 recover their elastic deformations, the first clamping piece 11 and the second clamping piece 12 will be pulled back, so that the first clamping piece 11 and the second clamping piece 12 tightly press the inner surface of the explosion-proof film 9 to be tested, while the top of the rubber ring 13 is in close contact with the outer surface of the explosion-proof film 9 to be tested. This not only achieves the purpose of fixing the explosion-proof film 9 to be tested, but also ensures the sealing performance of the explosion-proof film container 201 and avoids the leakage of the test medium in the explosion-proof film container 201.

[0072] In addition, in this embodiment, the part of the chassis 6 inside the rubber ring 13 has a perforation. Thus, when the explosion-proof film 9 to be tested is placed on the rubber ring 13 for fixing, the inner surface of the explosion-proof film 9 to be tested comes into contact with the test medium in the explosion-proof film container 201, while its outer surface passes through the perforation and is in contact with the external air. Compared with the existing explosion-proof film testing device for transformers, which usually places the entire explosion-proof film 9 to be tested inside a high-temperature furnace so that the temperatures on both sides of the explosion-proof film 9 to be tested are the same, this embodiment can better simulate the actual working environment of the explosion-proof film, that is, the temperatures on its inner and outer surfaces must be different, ensuring that the temperature of the inner surface of the explosion-proof film 9 to be tested is affected by the temperature of the test medium, while the temperature of the outer surface is the room temperature, thus guaranteeing the test accuracy of the aging test.

[0073] As a preferred solution, a plurality of through holes are provided on the chassis 6; the through holes on the chassis 6 of two adjacent explosion-proof film containers 201 are connected by a support rod 16.

[0074] Specifically, in this embodiment, a plurality of through holes are provided on the chassis 6 of the explosion-proof film container 201, and the through holes on the chassis 6 of two adjacent explosion-proof film containers 201 are connected by inserting a support rod 16, thereby improving the overall stability of the test container 2. It should be noted that the support rod 16 and the through hole on the chassis 6 can be fixedly connected or detachably connected, and this embodiment does not make specific limitations here.

[0075] As a preferred solution, a plurality of jacks are provided on the tabletop of the vibration table 3, and the tabletop of the vibration table 3 and the bottom of the test container 2 are connected by a plurality of support columns 17, and one end of the support column 17 is connected to the bottom of the test container 2, and the other end of the support column 17 is inserted into the jack.

[0076] Specifically, in order to prevent the test container 2 from being unstable due to the vibration of the vibration table 3, a plurality of jacks are provided on the tabletop of the vibration table 3 in this embodiment, and a plurality of support columns 17 are provided between the tabletop of the vibration table 3 and the bottom of the test container 2. One end of each support column 17 is connected to the bottom of the test container 2, and the other end is inserted into the jack on the tabletop to fix the test container 2 and prevent the test container 2 from falling during the aging test.

[0077] As a preferred solution, a plurality of baffles are provided on the tabletop of the vibration table 3, and the baffles are arranged outside the test container 2.

[0078] Specifically, a plurality of baffles are also provided on the tabletop of the vibration table 3 in this embodiment to better prevent the test container 2 from falling during the aging test. Exemplarily, the baffles can be arranged at the edge of the tabletop of the vibration table 3 or can be arranged close to the outside of the test container 2, and this embodiment does not make specific limitations here.

[0079] Please refer to Figure 5 , the second aspect of the embodiment of the present invention provides a method for testing an explosion-proof film for a transformer, which is applied to the explosion-proof film testing system for a transformer as described in any embodiment of the first aspect, and includes the following steps S1 to step S3:

[0080] Step S1, according to the preset test pressure, test temperature, test vibration frequency, and / or test vibration acceleration, and in accordance with the preset test duration, control the pressure adjustment module, the temperature adjustment module, and / or the vibration table through the control module to perform an aging test on at least one explosion-proof film to be tested placed in the test container;

[0081] Step S2, when the explosion-proof film to be tested completes the aging test, detect the bursting pressure of the explosion-proof film to be tested;

[0082] Step S3, obtain the aging resistance performance test result of the explosion-proof film to be tested according to the bursting pressure and the calibrated bursting pressure.

[0083] Specifically, considering different aging tests, the environmental factors to be simulated may be different. Therefore, in this embodiment, the test pressure, test temperature, test vibration frequency, and / or test vibration acceleration are first set. It can be understood that the aging test may only introduce one of the pressure influence factor, temperature influence factor, and vibration influence factor, or may introduce two or all of them. Therefore, according to the type of influence factor to be introduced, at least one parameter among the test pressure, test temperature, test vibration frequency, and test vibration acceleration is selected and set. Then, during the aging test, the pressure adjustment module is controlled by the control module according to the preset test pressure; and / or, the temperature adjustment module is controlled by the control module according to the preset test temperature; and / or, the vibration table is controlled by the control module according to the preset test vibration frequency and test vibration acceleration to perform the aging test on at least one explosion-proof film to be tested placed in the test container.

[0084] In an optional embodiment, the pressure adjustment range in the test container is from 0.05 MPa to 0.3 MPa, and the pressure adjustment step of the control module is 0.01 MPa; the temperature adjustment range in the test container is from room temperature to 90 °C, and the temperature adjustment step of the control module is 5 °C; the vibration frequency adjustment range of the vibration table is from 50 Hz to 2 kHz, and the vibration frequency adjustment step of the control module is from 10 Hz to 100 Hz; the vibration acceleration adjustment range of the vibration table is from 1.5 m / s 2 to 2 m / s 2 and the vibration acceleration adjustment step of the control module is 0.1 m / s 2 .

[0085] Further, when the explosion-proof film to be tested completes the aging test, a bursting test is performed on the explosion-proof film to be tested that has completed the aging test to test the mechanical properties of the explosion-proof film to be tested, and the bursting pressure of the explosion-proof film to be tested is determined;

[0086] Further, according to the bursting pressure and the calibrated bursting pressure, the aging resistance performance test result of the explosion-proof film to be tested can be obtained.

[0087] As a preferred solution, the pressure adjustment module includes an air compressor, a solenoid valve, a pressure stabilizing tank, and a pressure sensor;

[0088] Then, the method further includes:

[0089] During the aging test of the explosion-proof film to be tested, the control module obtains the real-time pressure transmitted by the pressure sensor;

[0090] When it is detected that the real-time pressure is less than the test pressure, the control module controls the solenoid valve to open to increase the pressure in the test container to the test pressure.

[0091] Specifically, in the aging test of the explosion-proof film to be tested, the control module and the pressure sensor monitor the real-time pressure in the test container. To ensure the test accuracy of the aging test, in this embodiment, when it is detected that the real-time pressure is less than the test pressure, the control module controls the solenoid valve to open to increase the pressure in the test container, so as to ensure that the pressure in the test container can always be maintained at the test pressure.

[0092] As a preferred solution, the temperature adjustment module includes a heating unit and a temperature sensor, and the temperature sensor is attached to the inner surface of the explosion-proof film to be tested;

[0093] Then, the method further includes:

[0094] During the aging test of the explosion-proof film to be tested, the control module obtains the real-time temperature transmitted by the temperature sensor;

[0095] When it is detected that the real-time temperature is less than the test temperature, the control module controls the heating unit to increase the power to raise the temperature of the inner surface of the explosion-proof film to be tested to the test temperature.

[0096] Specifically, in the aging test of the explosion-proof film to be tested, the control module and the temperature sensor monitor the real-time temperature in the test container. To ensure the test accuracy of the aging test, in this embodiment, when it is detected that the real-time temperature is less than the test temperature, the control module controls the heating unit to increase the power to raise the temperature of the inner surface of the explosion-proof film to be tested, so as to ensure that the temperature of the inner surface of the explosion-proof film to be tested can always be maintained at the test temperature.

[0097] As a preferred solution, obtaining the aging resistance performance test result of the explosion-proof film to be tested according to the burst pressure and the calibrated burst pressure specifically includes:

[0098] Calculate the relative error of the burst pressure according to the burst pressure and the calibrated burst pressure;

[0099] When the calibrated burst pressure is 0.01 MPa to 0.1 MPa and the relative error is 0 to 25%, it is determined that the aging resistance performance test result is good aging resistance performance;

[0100] When the calibrated burst pressure is 0.1 MPa to 0.3 MPa and the relative error is 0 to 15%, it is determined that the anti-aging performance test result is good anti-aging performance;

[0101] When the calibrated burst pressure is 0.3 MPa to 100 MPa and the relative error is 0 to 5%, it is determined that the anti-aging performance test result is good anti-aging performance.

[0102] Specifically, this embodiment evaluates the anti-aging performance of the explosion-proof film to be tested based on the relative error of the burst pressure of the explosion-proof film. This relative error needs to be calculated based on the burst pressure and the calibrated burst pressure, that is: relative error = |burst pressure - calibrated burst pressure| ÷ calibrated burst pressure × 100%. Then, this embodiment sets corresponding different judgment criteria for different calibrated burst pressures to meet the anti-aging performance test requirements of explosion-proof films with different calibrated burst pressures.

[0103] The explosion-proof film test method for transformers provided by the embodiments of the present invention can achieve the coupling of pressure factors, temperature factors, and vibration factors through a pressure adjustment module, a temperature adjustment module, and a vibration table, and can complete the aging test of the explosion-proof film under multiple environmental factors, thereby effectively testing the anti-aging performance of the explosion-proof film.

[0104] The above is the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. A transformer explosion-proof membrane testing system, characterized in that: It includes a control module, a pressure adjustment module, a temperature adjustment module, a vibration table and a test container; The test container is arranged on the vibration table, and the test container is used to place at least one explosion-proof membrane to be tested; the control end of the control module is respectively connected to the controlled end of the pressure adjustment module, the controlled end of the temperature adjustment module, and the control end of the vibration table; the air outlet of the pressure adjustment module is connected to the test container, and the temperature adjustment module is arranged in the test container; the test container is also used to place a test medium; the test container includes a plurality of explosion-proof membrane containers arranged in layers; the explosion-proof membrane container includes a bottom plate, a top cover, an outer ring and a clamping and fixing assembly, the clamping and fixing assembly is arranged in the accommodating cavity of the explosion-proof membrane container, and the clamping and fixing assembly is used to fix the explosion-proof membrane to be tested in the accommodating cavity; The clamping and fixing assembly comprises a rubber ring, a first spring member, a first clamping sheet, a second spring member and a second clamping sheet; The rubber ring, the first spring member and the second spring member are all arranged on the chassis, the bottom of the first clamping piece is connected to the first spring member, the bottom of the second clamping piece is connected to the second spring member, and the first clamping piece and the second clamping piece are both located above the rubber ring; The chassis is provided with a perforation, and the rubber ring is arranged on the outside of the perforation. When the explosion-proof membrane to be tested is placed in the accommodating cavity, the outer surface of the explosion-proof membrane to be tested is located above the perforation and arranged on the top of the rubber ring, and the first clamping piece and the second clamping piece are respectively arranged on the inner surface of the explosion-proof membrane to be tested; The vibration table is specifically a three-dimensional vibration table, which is driven by electromagnetic force to drive the explosion-proof membrane to be tested in the test container to perform three-dimensional vibration in six directions, namely, up, down, left, right, front and back.

2. The explosion-proof membrane testing system for transformer according to claim 1, characterized in that: The test medium is compressed air, water or transformer oil, and when the test medium is water or transformer oil, the test medium immerses the temperature adjustment module.

3. The explosion-proof membrane testing system for transformer according to claim 1, characterized in that: The pressure adjustment module includes an air compressor, a solenoid valve, a pressure regulating tank and a pressure sensor; The gas output end of the air compressor is connected to the air inlet of the pressure-stabilizing tank through the solenoid valve, and the air outlet of the pressure-stabilizing tank is connected to the test container through an air duct. The pressure sensor is arranged on the air duct, and the output end of the pressure sensor is connected to the pressure monitoring end of the control module. The control end of the control module is connected to the controlled end of the solenoid valve to transmit the compressed air generated by the air compressor to the pressure-stabilizing tank.

4. The explosion-proof membrane testing system for transformer according to claim 2, characterized in that: The temperature adjustment module includes a heating unit and a temperature sensor; The heating unit is arranged in the test container, the temperature sensor is attached to the inner surface of the explosion-proof membrane to be tested, the output end of the temperature sensor is connected to the temperature monitoring end of the control module, and the control end of the control module is connected to the controlled end of the heating unit.

5. The explosion-proof membrane testing system for transformer according to claim 1, characterized in that: The explosion-proof membrane container is used to place the explosion-proof membrane to be tested, the air outlet of the pressure adjustment module is respectively connected to each of the explosion-proof membrane containers, and the temperature adjustment module is arranged in each of the explosion-proof membrane containers.

6. The explosion-proof membrane testing system for transformer according to claim 5, characterized in that: The outer ring is arranged on the bottom plate, the top cover is arranged on the top of the outer ring, and a receiving cavity for placing the explosion-proof membrane to be tested is formed in the outer ring.

7. The explosion-proof membrane testing system for transformer according to claim 6, characterized in that: The chassis is provided with a plurality of through holes; the through holes on the chassis of two adjacent explosion-proof membrane containers are connected by supporting rods.

8. The explosion-proof membrane testing system for transformer according to claim 1, characterized in that: The table top of the vibration table is provided with a plurality of jacks, the table top of the vibration table is connected to the bottom of the test container via a plurality of pillars, one end of the pillar is connected to the bottom of the test container, and the other end of the pillar is inserted into the jack.

9. The explosion-proof membrane testing system for transformer according to claim 1 or 8, characterized in that: A plurality of baffles are arranged on the table top of the vibration table, and the baffles are arranged on the outside of the test container.

10. A method for testing explosion-proof membrane for transformer, applied to the explosion-proof membrane testing system for transformer as claimed in any one of claims 1 to 9, characterized in that: include: According to a preset test pressure, test temperature, test vibration frequency and / or test vibration acceleration, and according to a preset test duration, the pressure adjustment module, the temperature adjustment module and / or the vibration table are controlled by the control module to perform an aging test on at least one explosion-proof membrane to be tested placed in the test container; When the explosion-proof membrane to be tested completes the aging test, detecting the bursting pressure of the explosion-proof membrane to be tested; According to the bursting pressure and the calibrated bursting pressure, the aging resistance test result of the explosion-proof membrane to be tested is obtained.

11. The explosion-proof membrane testing method for transformer according to claim 10, characterized in that: The pressure adjustment module includes an air compressor, a solenoid valve, a pressure regulating tank and a pressure sensor; Then, the method further comprises: During the aging test of the explosion-proof membrane to be tested, the real-time pressure transmitted by the pressure sensor is obtained through the control module; When it is detected that the real-time pressure is lower than the test pressure, the control module controls the solenoid valve to open, so as to increase the pressure in the test container to the test pressure.

12. The explosion-proof membrane testing method for transformer according to claim 10, characterized in that: The temperature adjustment module includes a heating unit and a temperature sensor, and the temperature sensor is attached to the inner surface of the explosion-proof membrane to be tested; Then, the method further comprises: During the aging test of the explosion-proof membrane to be tested, the real-time temperature transmitted by the temperature sensor is obtained through the control module; When it is detected that the real-time temperature is lower than the test temperature, the control module controls the heating unit to increase power so as to raise the temperature of the inner surface of the explosion-proof membrane to be tested to the test temperature.

13. The explosion-proof membrane testing method for transformer according to claim 10, characterized in that: The step of obtaining the aging resistance test result of the explosion-proof membrane to be tested according to the explosion pressure and the calibrated explosion pressure specifically includes: Calculating a relative error of the bursting pressure according to the bursting pressure and the calibrated bursting pressure; When the calibrated bursting pressure is 0.01 MPa to 0.1 MPa and the relative error is 0 to 25%, the aging resistance test result is determined to be good aging resistance; When the calibrated bursting pressure is 0.1 MPa to 0.3 MPa and the relative error is 0 to 15%, the aging resistance test result is determined to be good aging resistance; When the calibrated bursting pressure is 0.3 MPa-100 MPa and the relative error is 0-5%, it is determined that the aging resistance test result is good.

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