Explosion-proof membrane testing system and method for transformer

Abstract

The invention discloses an explosion-proof membrane testing system and method for a transformer, and belongs to the technical field of explosion-proof membrane detection. The system comprises a control module, a pressure adjusting module, a temperature adjusting module, a vibration table and a testing container; the test container is arranged on the vibration table, and the test container is used for placing at least one explosion-proof membrane to be tested; the control end of the control module is connected with the controlled end of the pressure adjusting module, the controlled end of the temperature adjusting module and the control end of the vibration table. An air outlet of the pressure adjusting module is connected with the testing container, and the temperature adjusting module is arranged in the testing container. Through the pressure adjusting module, the temperature adjusting module and the vibration table, coupling of a pressure factor, a temperature factor and a vibration factor can be achieved, aging tests of the explosion-proof membrane under multiple environmental factors can be completed, and therefore the anti-aging performance of the explosion-proof membrane can be effectively tested.

Description

Technical Field

[0001] The present invention relates to the technical field of explosion-proof film detection, and in particular to an explosion-proof film testing system and method for a transformer. Background Art

[0002] During the operation of oil-immersed transformers, 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 gas and high-temperature transformer oil to come into contact with oxygen, causing combustion and explosion. In order to improve the explosion-proof capability of the transformer oil tank, an explosion-proof membrane type pressure relief device is usually installed in the transformer. The explosion-proof membrane is one of the important components of the explosion-proof membrane type pressure relief device, and its aging resistance is an important indicator to ensure its long-term operating stability.

[0003] In the prior art, the explosion-proof membrane testing device for transformers can usually only realize the aging test of the explosion-proof membrane under a single environmental factor. The test factors are incomplete, resulting in poor test results of the explosion-proof membrane and inability to effectively test the aging resistance of the explosion-proof membrane. Summary of the invention

[0004] The present invention provides a system and method for testing explosion-proof membranes of transformers, so as to solve the technical problem that the explosion-proof membrane testing device for transformers in the prior art cannot effectively test the aging resistance of the explosion-proof membranes due to a single test factor considered.

[0005] In order to solve the above technical problems, a first aspect of an embodiment of the present invention provides an explosion-proof membrane testing system for a transformer, including 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.

[0006] As a preferred solution, the test container 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 immerses the temperature adjustment module.

[0007] As a preferred solution, 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.

[0008] As a preferred solution, 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.

[0009] As a preferred embodiment, the test container includes a plurality of explosion-proof membrane containers arranged in layers, wherein the explosion-proof membrane containers are 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 provided in each of the explosion-proof membrane containers.

[0010] As a preferred solution, the explosion-proof membrane container includes a bottom plate, a top cover, an outer ring and a clamping and fixing assembly; The outer ring member is arranged on the chassis, the top cover is arranged on the top of the outer ring member, a receiving cavity is formed in the outer ring member for placing the explosion-proof membrane to be tested, the clamping and fixing assembly is arranged in the receiving cavity, and the clamping and fixing assembly is used to fix the explosion-proof membrane to be tested in the receiving cavity.

[0011] As a preferred solution, the clamping and fixing assembly includes 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 through hole, and the rubber ring is arranged on the outside of the through hole. 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 through hole and is 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.

[0012] As a preferred solution, 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 a support rod.

[0013] As a preferred embodiment, a plurality of jacks are provided on the table top of the vibration table, and the table top of the vibration table is connected to the bottom of the test container via a plurality of pillars, one end of each pillar is connected to the bottom of the test container, and the other end of each pillar is inserted into the jack.

[0014] As a preferred solution, a plurality of baffles are provided on the table top of the vibration table, and the baffles are arranged on the outside of the test container.

[0015] A second aspect of an embodiment of the present invention provides a method for testing an explosion-proof membrane for a transformer, which is applied to a system for testing an explosion-proof membrane for a transformer as described in any one of the first aspects, comprising: 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.

[0016] As a preferred solution, 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.

[0017] 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 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.

[0018] As a preferred solution, obtaining the aging resistance test result of the explosion-proof membrane to be tested according to the bursting pressure and the calibrated bursting 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 0.01MPa~0.1MPa, and the relative error is 0~25%, 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.

[0019] Compared with the prior art, the beneficial effect of the embodiments of the present invention lies in that, through the pressure adjustment module, the temperature adjustment module and the vibration table, the coupling of pressure factors, temperature factors and vibration factors can be achieved, and the aging test of the explosion-proof membrane under multiple environmental factors can be completed, thereby effectively testing the aging resistance of the explosion-proof membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the overall structure of the explosion-proof membrane testing system for transformers in an embodiment of the present invention; Figure 2 Schematic diagram of the overall structure of the explosion-proof membrane container in the embodiment of the present invention; Figure 3 Schematic diagram of the internal structure of the explosion-proof membrane container in an embodiment of the present invention; Figure 4 is a schematic structural diagram of a clamping and fixing assembly in an embodiment of the present invention; Figure 5 1 is a flow chart of a method for testing explosion-proof membrane of a transformer in an embodiment of the present invention; Among them, 1. control module; 2. test container; 201, explosion-proof membrane container; 3. vibration table; 4. air compressor; 5. pressure-stabilizing tank; 6. chassis; 7. outer ring; 8. top cover; 9. explosion-proof membrane 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. pillar. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] See also Figure 1 , a first aspect of an embodiment of the present invention provides an explosion-proof membrane testing system for a transformer, comprising a control module 1, a pressure adjustment module, a temperature adjustment module, a vibration table 3 and a test container 2; The test container 2 is arranged on the vibration table 3, and the test container 2 is used to place at least one explosion-proof membrane 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 vibration 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.

[0023] Specifically, the pressure adjustment module in this embodiment is used to introduce the pressure influencing factor in the aging process of the explosion-proof membrane in the aging test, the temperature adjustment module is used to introduce the temperature influencing factor in the aging process of the explosion-proof membrane in the aging test, and the vibration table 3 is used to introduce the vibration influencing factor in the aging process of the explosion-proof membrane in the aging test. In addition, the control module 1 is used to control the pressure adjustment module, the temperature adjustment module and the vibration table 3 respectively, so that when performing the aging test of the explosion-proof membrane, one of the influencing factors can be introduced to realize the aging test under a single environmental factor, and multiple influencing factors can also be introduced to realize the aging test under multiple environmental factors.

[0024] Furthermore, the test container 2 in this embodiment can hold at least one explosion-proof membrane 9 to be tested, so that multiple explosion-proof membranes can be subjected to aging tests simultaneously, which significantly improves the efficiency of the aging test.

[0025] As one of the preferred embodiments, the vibration table 3 is specifically a three-dimensional vibration table, which is driven by electromagnetic force and can drive the explosion-proof membrane 9 to be tested in the test container 2 to perform three-dimensional vibration in six directions: up, down, left, right, front and back.

[0026] The explosion-proof membrane testing system for transformers provided in the embodiment of the present invention can achieve the coupling of pressure factors, temperature factors and vibration factors through the pressure adjustment module, the temperature adjustment module and the vibration table 3, and can complete the aging test of the explosion-proof membrane under multiple environmental factors, thereby effectively testing the aging resistance of the explosion-proof membrane.

[0027] 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 immerses the temperature adjustment module.

[0028] 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, which acts on the inner side of the explosion-proof membrane 9 to be tested. Generally, the test medium is compressed air. In order to simulate the interaction between different media and the explosion-proof membrane, such as simulating the interaction between transformer oil and the explosion-proof membrane, the test medium can also be water or transformer oil, or 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 be immersed in the temperature adjustment module so that the temperature adjustment module can effectively adjust the temperature of the test medium in the test container 2.

[0029] As a preferred solution, the pressure adjustment module includes an air compressor 4, a solenoid valve, a pressure regulating tank 5 and a pressure sensor; 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, and the air outlet of the pressure-stabilizing tank 5 is connected to the test container 2 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 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 to the pressure-stabilizing tank 5.

[0030] 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 an air duct, so as to achieve the purpose of regulating the pressure in the test container 2. During the aging test, the control module 1 can control the pressure in the test container 2 by controlling the opening and closing of the solenoid valve, so that the pressure in the test container 2 can be maintained at a preset test pressure.

[0031] In an optional embodiment, the pressure adjustment range in the test container 2 is 0.05 MPa to 0.3 MPa, and the pressure adjustment step of the control module 1 is 0.01 MPa.

[0032] As a preferred solution, the temperature adjustment module includes a heating unit 10 and a temperature sensor; The heating unit 10 is arranged in the test container 2, the temperature sensor is attached to the inner surface of the explosion-proof membrane 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.

[0033] 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 or transformer oil, or other liquids, the test medium needs to immerse 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 achieve the purpose of temperature regulation by controlling the working power of the heating unit 10. Exemplarily, the control module 1 can monitor the temperature of the inner surface of the explosion-proof membrane based on the temperature sensor, and control the working power of the heating unit 10 at the same time. When the temperature is lower than the preset test temperature, the heating unit 10 is controlled to increase the working power; when the temperature reaches the preset test temperature, the heating unit 10 is controlled to reduce the working power to keep the temperature basically unchanged.

[0034] As an optional embodiment, the heating unit 10 in this embodiment may be a heating plate, a fin-type electric heating tube or other heating device, which is not specifically limited in this embodiment.

[0035] In an optional 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.

[0036] As a preferred embodiment, the test container 2 includes a plurality of explosion-proof membrane containers 201 arranged in layers, and the explosion-proof membrane container 201 is used to place the explosion-proof membrane 9 to be tested, and the air outlet of the pressure adjustment module is respectively connected to each of the explosion-proof membrane containers 201, and each of the explosion-proof membrane containers 201 is provided with the temperature adjustment module.

[0037] Specifically, the present embodiment forms the test container 2 by a plurality of explosion-proof membrane containers 201 arranged in layers, so that the aging test can be performed on a plurality of explosion-proof membrane containers 201 at the same time. 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 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 membrane containers 201 through an air duct, and a pressure sensor is provided on each air duct. In addition, in the present embodiment, a temperature adjustment module is provided in each explosion-proof membrane container 201, so that the control module 1 can adjust the temperature in each explosion-proof membrane container 201 individually.

[0038] As a preferred solution, the explosion-proof membrane container 201 includes a bottom plate 6, a top cover 8, an outer ring 7 and a clamping and fixing assembly; 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, and a receiving cavity for placing the explosion-proof membrane 9 to be tested is formed in the outer ring member 7, the clamping and fixing assembly is arranged in the receiving cavity, and the clamping and fixing assembly is used to fix the explosion-proof membrane 9 to be tested in the receiving cavity.

[0039] Specifically, Figure 2 As shown, the explosion-proof membrane container 201 in this embodiment includes a chassis 6, a top cover 8, an outer ring member 7 and a clamping and fixing assembly. The outer ring member 7 is arranged on the chassis 6, and the top cover 8 is arranged on the top of the outer ring member 7, so that a receiving cavity for placing the explosion-proof membrane 9 to be tested can be formed in the outer ring member 7. In order to prevent the explosion-proof membrane 9 to be tested from falling off or moving during the aging test, thereby affecting the test accuracy, the explosion-proof membrane 9 to be tested can be fixed by arranging a clamping and fixing assembly in the receiving cavity.

[0040] 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; The rubber ring 13, the first spring member 14 and the second spring member 15 are all arranged on the chassis 6, the bottom of the first clamping piece 11 is connected to the first spring member 14, the bottom of the second clamping piece 12 is connected to the second spring member 15, and the first clamping piece 11 and the second clamping piece 12 are both located above the rubber ring 13; The chassis 6 is provided with a through hole, and the rubber ring 13 is arranged on the outside of the through hole. When the explosion-proof membrane 9 to be tested is placed in the accommodating cavity, the outer surface of the explosion-proof membrane 9 to be tested is located above the through hole and is arranged on the top of the rubber ring 13, and the first clamping piece 11 and the second clamping piece 12 are respectively arranged on the inner surface of the explosion-proof membrane 9 to be tested.

[0041] Specifically, Figure 3 and Figure 4As 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 membrane 9 to be tested, the first clamping piece 11 and the second clamping piece 12 are first moved upward to increase the clamping space between the first clamping piece 11, the second clamping piece 12 and the rubber ring 13, so that the explosion-proof membrane is placed above the rubber ring 13, and then the first clamping piece 11 and the second clamping piece 1 are released. 2. At this time, the tension generated by the first spring member 14 and the second spring member 15 when they recover their elastic deformation will pull the first clamping piece 11 and the second clamping piece 12 back, so that the first clamping piece 11 and the second clamping piece 12 tightly press the inner surface of the explosion-proof membrane 9 to be tested, and the top of the rubber ring 13 is in close contact with the outer surface of the explosion-proof membrane 9 to be tested, which not only achieves the purpose of fixing the explosion-proof membrane 9 to be tested, but also ensures the sealing of the explosion-proof membrane container 201, and avoids the leakage of the test medium in the explosion-proof membrane container 201.

[0042] In addition, in the present embodiment, the portion of the chassis 6 located on the inner side of the rubber ring 13 has a perforation, so that when the explosion-proof membrane 9 to be tested is placed on the rubber ring 13 for fixation, the inner surface of the explosion-proof membrane 9 to be tested is in contact with the test medium in the explosion-proof membrane container 201, while its outer surface is in contact with the outside air through the perforation. Compared with the explosion-proof membrane testing device for transformers in the prior art, which usually places the entire explosion-proof membrane 9 to be tested inside a high-temperature furnace so that the temperatures on both sides of the explosion-proof membrane 9 to be tested are consistent, the present embodiment can better simulate the actual working environment of the explosion-proof membrane, that is, the temperatures borne by its inner and outer surfaces must be different, ensuring that the temperature of the inner surface of the explosion-proof membrane 9 to be tested is affected by the temperature of the test medium, while the temperature of the outer surface is room temperature, thereby ensuring the test accuracy of the aging test.

[0043] As a preferred solution, the chassis 6 is provided with a plurality of through holes; the through holes on the chassis 6 of two adjacent explosion-proof membrane containers 201 are connected by a support rod 16 .

[0044] Specifically, in the present embodiment, a plurality of through holes are provided on the chassis 6 of the explosion-proof membrane container 201, and the through holes on the chassis 6 of two adjacent explosion-proof membrane containers 201 are connected by inserting a support rod 16, thereby improving the overall stability of the test container 2. It is worth noting that the support rod 16 in the present embodiment can be fixedly connected to the through holes on the chassis 6 or detachably connected, which is not specifically limited in the present embodiment.

[0045] As a preferred solution, a plurality of jacks are provided on the table top of the vibration table 3, and the table top of the vibration table 3 is connected to the bottom of the test container 2 via a plurality of pillars 17, and one end of the pillar 17 is connected to the bottom of the test container 2, and the other end of the pillar 17 is inserted into the jack.

[0046] Specifically, in order to prevent the test container 2 from being unstable due to the vibration of the vibration table 3, the present embodiment provides a plurality of sockets on the table top of the vibration table 3, and a plurality of pillars 17 are provided between the table top of the vibration table 3 and the bottom of the test container 2. One end of each pillar 17 is connected to the bottom of the test container 2, and the other end is inserted into the socket on the table top to achieve the purpose of fixing the test container 2 and prevent the test container 2 from falling during the aging test.

[0047] As a preferred solution, a plurality of baffles are provided on the table top of the vibration table 3 , and the baffles are arranged on the outside of the test container 2 .

[0048] Specifically, the present embodiment further provides a plurality of baffles on the table top of the vibration table 3 to better prevent the test container 2 from falling during the aging test. For example, the baffles may be provided at the edge of the table top of the vibration table 3 or may be provided close to the outer side of the test container 2. The present embodiment does not make any specific limitation here.

[0049] See also Figure 5 A second aspect of an embodiment of the present invention provides a method for testing an explosion-proof membrane for a transformer, which is applied to a test system for testing an explosion-proof membrane for a transformer as described in any embodiment of the first aspect, and includes the following steps S1 to S3: Step S1, 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 a test container; Step S2, when the explosion-proof membrane to be tested completes the aging test, detecting the bursting pressure of the explosion-proof membrane to be tested; Step S3, obtaining the aging resistance test result of the explosion-proof membrane to be tested according to the bursting pressure and the calibrated bursting pressure.

[0050] Specifically, considering that different aging tests may require different environmental factors to be simulated, the present embodiment first sets the test pressure, test temperature, test vibration frequency and / or test vibration acceleration. It is understandable that the aging test may introduce only one of the pressure influencing factors, temperature influencing factors and vibration influencing factors, or may introduce two or all of them. Therefore, according to the type of influencing factors 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, so as to perform an aging test on at least one explosion-proof membrane to be tested placed in the test container.

[0051] In an optional embodiment, the pressure adjustment range in the test container is 0.05MPa to 0.3MPa, and the pressure adjustment step of the control module is 0.01MPa; the temperature adjustment range in the test container is 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 50Hz to 2kHz, and the vibration frequency adjustment step of the control module is 10Hz to 100Hz; the vibration acceleration adjustment range of the vibration table is 1.5m / s 2 Up to 2m / s 2 The vibration acceleration adjustment step of the control module is 0.1m / s 2 .

[0052] Further, when the explosion-proof membrane to be tested has completed the aging test, a bursting test is performed on the explosion-proof membrane to be tested that has completed the aging test to test the mechanical properties of the explosion-proof membrane to be tested and determine the bursting pressure of the explosion-proof membrane to be tested; Furthermore, according to the bursting pressure and the calibrated bursting pressure, the aging resistance test result of the explosion-proof membrane to be tested can be obtained.

[0053] As a preferred solution, 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.

[0054] Specifically, during the aging test of the explosion-proof membrane to be tested, the present embodiment monitors the real-time pressure in the test container through the control module and the pressure sensor. In order to ensure the test accuracy of the aging test, the present embodiment controls the solenoid valve to open to increase the pressure in the test container when it detects that the real-time pressure is less than the test pressure, thereby ensuring that the pressure in the test container can always be maintained at the test pressure.

[0055] 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 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.

[0056] Specifically, during the aging test of the explosion-proof membrane to be tested, the present embodiment monitors the real-time temperature in the test container through the control module and the temperature sensor. In order to ensure the test accuracy of the aging test, the present embodiment controls the heating unit to increase the power to increase the temperature of the inner surface of the explosion-proof membrane to be tested through the control module when it is detected that the real-time temperature is lower than the test temperature, thereby ensuring that the temperature of the inner surface of the explosion-proof membrane to be tested can always be maintained at the test temperature.

[0057] As a preferred solution, obtaining the aging resistance test result of the explosion-proof membrane to be tested according to the bursting pressure and the calibrated bursting 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 0.01MPa~0.1MPa, and the relative error is 0~25%, 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.

[0058] Specifically, this embodiment evaluates the aging resistance of the explosion-proof membrane to be tested based on the relative error of the bursting pressure, and the relative error needs to be calculated based on the bursting pressure and the calibrated bursting pressure, that is, relative error = | bursting pressure - calibrated bursting pressure | ÷ calibrated bursting pressure × 100%. Then, this embodiment sets different judgment criteria corresponding to different calibrated bursting pressures to meet the aging resistance test requirements of explosion-proof membranes with different calibrated bursting pressures.

[0059] The explosion-proof membrane testing method for a transformer provided in an embodiment 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 membrane under multiple environmental factors, thereby effectively testing the aging resistance of the explosion-proof membrane.

[0060] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection 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.

2. The explosion-proof membrane testing system for transformer according to claim 1, characterized in that: The test container is also used to place a test medium, which is compressed air, water or transformer oil. 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 test container includes a plurality of explosion-proof membrane containers arranged in layers, the explosion-proof membrane containers are 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 explosion-proof membrane container comprises a bottom plate, a top cover, an outer ring and a clamping and fixing assembly; The outer ring member is arranged on the chassis, the top cover is arranged on the top of the outer ring member, a receiving cavity is formed in the outer ring member for placing the explosion-proof membrane to be tested, the clamping and fixing assembly is arranged in the receiving cavity, and the clamping and fixing assembly is used to fix the explosion-proof membrane to be tested in the receiving cavity.

7. The explosion-proof membrane testing system for transformer according to claim 6, characterized in that: 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 through hole, and the rubber ring is arranged on the outside of the through hole. 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 through hole and is 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.

8. 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.

9. 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.

10. The explosion-proof membrane testing system for transformer according to claim 1 or 9, 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.

11. 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 10, 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.

12. The explosion-proof membrane testing method for transformer according to claim 11, 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.

13. The explosion-proof membrane testing method for transformer according to claim 11, 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.

14. The explosion-proof membrane testing method for transformer according to claim 11, 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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