Test platform and test method for built-in partial discharge monitoring device of converter transformer

Abstract

The invention relates to a test platform and a test method for a built-in partial discharge monitoring device of a converter transformer. The test platform comprises a vibration generation table, a supporting assembly, a butt joint base, the built-in partial discharge monitoring device and a built-in ultrahigh frequency sensor. The supporting assembly is arranged on the vibration generation table, the bottom end of the supporting assembly is connected with a horizontal plate of the vibration generation table, one end of the butt joint base is in sealed connection with one side of the supporting assembly, and the end, away from the supporting assembly, of the butt joint base is in sealed connection with the built-in partial discharge monitoring device. The built-in ultrahigh frequency sensor is connected with one end, deviating from the butt joint base, of the built-in partial discharge monitoring device through a connecting flange plate; the test process comprises a vacuum sealing test and a sealing and vibration combined test. Through the arrangement, a test platform is provided for the sealing performance and anti-vibration test of the built-in partial discharge monitoring device, and the forced shutdown of the converter transformer caused by the sealing performance and anti-vibration mechanical performance of the built-in monitoring device is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of converter transformers, and in particular to a test platform and a test method for a built-in partial discharge monitoring device of a converter transformer. Background Art

[0002] At present, converter transformers are key core equipment in power systems. Partial discharge monitoring is an effective technical means to timely grasp the sudden discharge state of converter transformers and block insulation failure. Existing results show that built-in sensors have significant advantages in improving the sensitivity of sensor devices and enhancing anti-interference capabilities.

[0003] When the converter transformer is operating normally, the converter transformer as a whole vibrates with the vibration of the iron core, etc. Based on the requirements for safe operation of the converter transformer body, when the built-in sensor is in long-term operation with the converter transformer, it is necessary to ensure that there is no leakage or deformation under long-term vibration conditions. Therefore, the built-in partial discharge monitoring device should be subjected to a separate sealing and vibration resistance test before leaving the factory, and can only be used after passing the test.

[0004] However, there is currently no test for the built-in partial discharge monitoring device of the converter transformer, so there is an urgent need for a platform for conducting a separate sealing and vibration resistance test on the built-in monitoring device. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a test platform and test method for a built-in partial discharge monitoring device for a converter transformer, which has the advantage of being able to avoid forced shutdown of the converter transformer due to problems with the sealing and anti-vibration mechanical properties of the built-in monitoring device.

[0006] The above-mentioned inventive object of the present invention is achieved through the following technical solutions: On the one hand, the present invention provides a test platform for a built-in partial discharge monitoring device of a converter transformer, comprising a vibration generating table, a support assembly, a docking base, a built-in partial discharge monitoring device and a built-in ultra-high frequency sensor; the support assembly is arranged on the vibration generating table, the bottom end of the support assembly is connected to the horizontal plate of the vibration generating table, one end of the docking base is sealedly connected to one side of the support assembly, the end of the docking base facing away from the support assembly is sealedly connected to the built-in partial discharge monitoring device, and the built-in ultra-high frequency sensor is connected to the end of the built-in partial discharge monitoring device facing away from the docking base through a connecting flange; the vibration generating table is used to provide the vibration conditions required for generating a vibration test.

[0007] Preferably, in the test platform for the built-in partial discharge monitoring device of the converter transformer provided by the present invention, the support assembly includes a fixed base plate and a support frame, the bottom surface of the fixed base plate is fitted with the top surface of the horizontal plate, the fixed base plate is connected to the horizontal plate, the bottom end of the support frame is connected to the top surface of the fixed base plate, and one end of the docking base is sealed and connected to the side wall near the top of the support frame.

[0008] Preferably, in the test platform for the built-in partial discharge monitoring device of the converter transformer provided by the present invention, the support assembly also includes two diagonal support rods, and the two diagonal support rods are respectively arranged on opposite sides of the support frame, one end of the diagonal support rod is connected to one side of the support frame, and the other end of the diagonal support rod is connected to the side wall of the fixed base plate.

[0009] Preferably, in the test platform for the built-in partial discharge monitoring device for converter transformer provided by the present invention, the support frame is in the shape of a rectangular parallelepiped.

[0010] Preferably, in the test platform for the built-in partial discharge monitoring device of the converter transformer provided by the present invention, a plurality of threaded holes are provided on the horizontal plate, the plurality of threaded holes are arranged in a matrix, a preset spacing is spaced between each adjacent two threaded holes, a plurality of through holes are provided on the fixed bottom plate, the through holes are arranged in one-to-one correspondence with the threaded holes, and one end of the fastening bolt passes through the through hole and is screwed into the corresponding threaded hole.

[0011] Preferably, in the test platform for the built-in partial discharge monitoring device for converter transformer provided by the present invention, the preset spacing ranges from 90 mm to 110 mm.

[0012] Preferably, in the test platform for the built-in partial discharge monitoring device for converter transformer provided by the present invention, the docking base is equivalent to simulating the modified manhole cover flange and valve when the built-in partial discharge monitoring device is installed.

[0013] Preferably, in the test platform for the built-in partial discharge monitoring device of the converter transformer provided by the present invention, the docking base includes a first flange, a connecting sleeve and a second flange, and the first flange is connected to the second flange through the connecting sleeve.

[0014] Preferably, in the test platform for the built-in partial discharge monitoring device of the converter transformer provided by the present invention, a sealing groove is provided on the side of the first flange facing away from the connecting sleeve, and a sealing ring is provided in the sealing groove to seal the first flange to the side wall close to the top of the supporting frame.

[0015] On the other hand, the present invention provides a test method for a test platform for a built-in partial discharge monitoring device for a converter transformer as described above, comprising the following steps:

[0016] The vacuum sealing test steps include opening the exhaust valve on the built-in partial discharge monitoring device, connecting the external vacuum pumping system to the exhaust valve, vacuuming the built-in partial discharge monitoring device, and using the pressure increment judgment method. When the vacuum gauge pointer in the vacuum pumping system reaches the preset pressure, continue to vacuum until the vacuum degree is stable; stop vacuuming, close the exhaust valve, maintain the first preset time, record the first vacuum value, continue to maintain the second preset time, record the vacuum value again, and calculate the pressure increase value;

[0017] After the sealing and vibration combined test steps and the vacuum sealing test of the built-in partial discharge monitoring device are passed, the oil filling valve and the exhaust valve on the built-in partial discharge monitoring device are opened, and oil is injected into the built-in partial discharge monitoring device through the oil filling valve. The gas in the built-in partial discharge monitoring device is completely discharged, and the exhaust valve is closed; the oil injection is continued to maintain the static pressure in the built-in partial discharge monitoring device at 190kPa~200kPa; the power supply on the vibration generating table is turned on, and the vibration parameters are set so that the vibration generating table vibrates according to the set vibration parameters. The test lasts for a preset time. During and after the test, the oil leakage of the built-in partial discharge monitoring device is observed.

[0018] In summary, the beneficial technical effects of the present invention are as follows: the present application provides a test platform and test method for a built-in partial discharge monitoring device for a converter transformer, wherein the test platform comprises a vibration generating table, a support assembly, a docking base, a built-in partial discharge monitoring device and a built-in ultra-high frequency sensor; the support assembly is arranged on the vibration generating table, the bottom end of the support assembly is connected to the horizontal plate of the vibration generating table, one end of the docking base is sealedly connected to one side of the support assembly, the end of the docking base facing away from the support assembly is sealedly connected to the built-in partial discharge monitoring device, and the built-in ultra-high frequency sensor is connected to the end of the built-in partial discharge monitoring device facing away from the docking base via a connecting flange; the vibration generating table is used to provide the vibration conditions required for the vibration test; the test process is: vacuum sealing test-sealing and vibration combined test; such an arrangement provides a test platform for the sealing and vibration resistance tests of the built-in partial discharge monitoring device, thereby avoiding the forced shutdown of the converter transformer due to the sealing and vibration resistance mechanical performance problems of the built-in monitoring device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of a test platform for a built-in partial discharge monitoring device for a converter transformer provided in an embodiment of the present invention.

[0020] Figure 2 It is an exploded view of a test platform for a built-in partial discharge monitoring device for a converter transformer provided in an embodiment of the present invention.

[0021] Figure 3It is a schematic diagram of the installation structure of a built-in partial discharge monitoring device at a manhole position of a converter transformer provided by an embodiment of the present invention.

[0022] Figure 4 It is a test flow chart of a test platform for a built-in partial discharge monitoring device for a converter transformer provided in an embodiment of the present invention.

[0023] In the figure, 1. test platform; 10. vibration generating table; 11. horizontal plate; 111. threaded hole; 20. support assembly; 21. fixed bottom plate; 211. through hole; 22. support frame; 221. mounting hole; 23. diagonal brace; 30. docking base; 31. first flange; 311. through hole; 32. connecting sleeve; 33. second flange; 331. fixing hole; 40. built-in partial discharge monitoring device; 41. oil filling valve; 42. exhaust valve; 43. fixing flange; 431. connecting hole; 44. mounting flange; 50. built-in UHF sensor; 60. connecting flange; 2. modified manhole cover flange; 3. valve. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0025] Reference Figure 1 and Figure 2 , which is a test platform 1 for a built-in partial discharge monitoring device for a converter transformer disclosed in the present invention, comprising a vibration generating platform 10, a support assembly 20, a docking base 30, a built-in partial discharge monitoring device 40 and a built-in ultra-high frequency sensor 50; the support assembly 20 is arranged on the vibration generating platform 10, the bottom end of the support assembly 20 is connected to the horizontal plate 11 of the vibration generating platform 10, one end of the docking base 30 is sealedly connected to one side of the support assembly 20, the end of the docking base 30 away from the support assembly 20 is sealedly connected to the built-in partial discharge monitoring device 40, and the built-in ultra-high frequency sensor 50 is connected to the end of the built-in partial discharge monitoring device 40 away from the docking base 30 through a connecting flange 60; the vibration generating platform 10 is used to provide the vibration conditions required for generating a vibration test; the support assembly 20 is used to support the weight of the docking base 30 and the built-in partial discharge monitoring device 40 during the vibration test; such a configuration provides a test platform 1 for the sealing and vibration resistance test of the built-in partial discharge monitoring device 40, thereby avoiding the forced shutdown of the converter transformer due to the sealing and vibration resistance mechanical performance problems of the built-in monitoring device.

[0026] Specifically, the built-in partial discharge monitoring device 40 is the test object of the sealing and vibration resistance test. Before the sealing and vibration resistance test is carried out, the built-in ultra-high frequency sensor 50 is connected to the built-in partial discharge monitoring device 40 through the connecting flange 60. The built-in partial discharge monitoring device 40 is provided with an exhaust valve 42 and an oil filling valve 41, which can be used for vacuuming and oiling during the sealing and vibration resistance test.

[0027] The test process of the test platform 1 for the built-in partial discharge monitoring device for converter transformers provided in this embodiment is divided into two parts: a vacuum sealing test and a sealing and vibration combined test:

[0028] Vacuum sealing test: open the exhaust valve 42 on the built-in partial discharge monitoring device 40, connect the external vacuum system to the exhaust valve 42, and evacuate the built-in partial discharge monitoring device 40; use the pressure increment judgment method to judge the sealing of the built-in partial discharge monitoring device 40. When the vacuum gauge pointer on the vacuum system reaches 133Pa, continue to evacuate until a stable vacuum value is obtained; then stop evacuating, close the exhaust valve 42, keep it for 10 minutes, record the first vacuum value, and then keep it for at least 30 minutes to record the vacuum value again, and calculate the pressure increment.

[0029] It should be noted that the pressure increase value should be less than 200Pa / h.

[0030] Sealing and vibration joint test: After the vacuum sealing test of the built-in partial discharge monitoring device 40 is passed, open the oil filling valve 41 and the exhaust valve 42, and inject oil into the built-in partial discharge monitoring device 40 through the oil filling valve 41 until the gas in the built-in partial discharge monitoring device 40 is completely exhausted, and then close the exhaust valve 42; continue to inject oil to maintain the static pressure in the built-in partial discharge monitoring device 40 at 190kPa~200kPa; turn on the power supply on the vibration generating platform 10, so that the vibration generating platform 10 vibrates according to the set parameters, the test lasts for 3*24 hours, and during and after the test, observe the oil leakage phenomenon of the built-in partial discharge monitoring device 40. Specifically, turn on the power supply on the vibration generating platform 10, and set the vibration parameters to a vertical vibration frequency of 100Hz and a sine wave with an amplitude of 100um, so that the vibration generating platform 10 vibrates according to the set vibration parameters, the test lasts for 3*24 hours, and during and after the test, observe the oil leakage phenomenon of the built-in partial discharge monitoring device 40.

[0031] Furthermore, in this embodiment, the support assembly 20 includes a fixed base plate 21 and a support frame 22. The bottom surface of the fixed base plate 21 is in contact with the top surface of the horizontal plate 11, the fixed base plate 21 is connected to the horizontal plate 11, the bottom end of the support frame 22 is connected to the top surface of the fixed base plate 21, and one end of the docking base 30 is sealed and connected to the side wall near the top of the support frame 22.

[0032] Exemplarily, bolts can be used to fix the bottom plate 21 and the horizontal plate 11. Of course, the bottom plate 21 and the horizontal plate 11 can also be fixed by clamping. In the implementation method of fixing the bottom plate 21 and the horizontal plate 11 by bolts, a plurality of threaded holes 111 are provided on the horizontal plate 11. The plurality of threaded holes 111 are arranged in a matrix. A preset spacing is provided between each two adjacent threaded holes 111. A plurality of through holes 211 are provided on the fixed bottom plate 21. The through holes 211 correspond to the threaded holes 111 one by one. One end of the fastening bolt passes through the through hole 211 and is screwed into the threaded hole 111 corresponding thereto.

[0033] The preset spacing ranges from 90 mm to 110 mm.

[0034] In this embodiment, the area of ​​the horizontal plate 11 is 900 mm*900 mm, the diameter of the threaded hole 111 is M10, the depth of the threaded hole 111 is 10 mm, and the preset spacing is 100 mm.

[0035] like Figure 2 As shown, in this embodiment, the number of the fastening bolts is 8. Of course, the number of the fastening bolts may also be 9 or 10.

[0036] In this embodiment, the overall height of the support assembly 20 is 480 mm, the length of the fixed bottom plate 21 is 380 mm, and the width of the fixed bottom plate 21 is 390 mm.

[0037] Furthermore, in this embodiment, the support assembly 20 also includes two oblique support rods 23, and the two oblique support rods 23 are respectively arranged on opposite sides of the support frame 22, one end of the oblique support rod 23 is connected to one side of the support frame 22, and the other end of the oblique support rod 23 is connected to the side wall of the fixed base plate 21; by setting two inclined support rods 23, the strength of the support assembly 20 is improved.

[0038] by Figure 1 Taking the illustrated position as an example, two inclined support rods 23 are respectively arranged at the front and rear sides of the support frame 22 .

[0039] Exemplarily, the support frame 22 may be in the shape of a cuboid. Of course, the support frame 22 may also be in the shape of a trapezoid.

[0040] Continue to refer to Figure 3 In this embodiment, the docking base 30 is equivalent to simulating the modified manhole cover flange 2 and valve 3 when the built-in partial discharge monitoring device 40 is installed.

[0041] The length of the docking base 30 along the X direction is equal to the total length of the modified manhole cover flange 2 and the valve 3 along the X direction.

[0042] Continue to refer to Figure 1 and Figure 2In this embodiment, the docking base 30 includes a first flange 31 , a connecting sleeve 32 and a second flange 33 , and the first flange 31 is connected to the second flange 33 through the connecting sleeve 32 .

[0043] Specifically, the center line of the first flange 31 and the center line of the second flange 33 are both arranged parallel to the center line of the connecting sleeve 32. In some feasible embodiments, the center line of the first flange 31 and the center line of the second flange 33 are both arranged colinearly with the center line of the connecting sleeve 32.

[0044] In this embodiment, the first flange 31 and the second flange 33 both adopt standard DN150 flanges, and the total length of the docking base 30 along the X direction is 150 mm.

[0045] Specifically, a plurality of through holes 311 are provided on the first flange 31, and the plurality of through holes 311 extend along the center line direction of the first flange 31 and penetrate the first flange 31. The plurality of through holes 311 are arranged at circumferential intervals along the first flange 31. A plurality of mounting holes 221 are provided on the support frame 22, and the plurality of mounting holes 221 extend along the center line direction of the first flange 31 and penetrate the support frame 22. The mounting holes 221 and the through holes 311 are arranged in one-to-one correspondence, and one end of the fixing bolt passes through the mounting hole 221 and the corresponding through hole 311 in sequence, and is threadedly connected with the nut to realize the connection between the first flange 31 and the support frame 22.

[0046] A sealing groove is formed on a side of the first flange 31 facing away from the connecting sleeve 32 , and a sealing ring is arranged in the sealing groove so that the first flange 31 is sealed and connected to the side wall near the top of the supporting frame 22 .

[0047] Furthermore, in this embodiment, the second flange 33 is sealedly connected to the fixed flange 43 on the built-in partial discharge monitoring device 40 .

[0048] A sealing groove is provided on a side of the second flange 33 facing the built-in partial discharge monitoring device 40 , and a sealing rubber ring is provided in the sealing groove to seal the second flange 33 and the fixed flange 43 .

[0049] Specifically, the second flange 33 is provided with a plurality of fixing holes 331, which all extend along the center line direction of the second flange 33 and penetrate the second flange 33. The plurality of second fixing holes 331 are arranged at intervals along the circumference of the second flange 33. The fixed flange 43 is provided with a plurality of connecting holes 431, which all extend along the center line direction of the fixed flange 43 and penetrate the fixed flange 43. The connecting holes 431 are arranged in a one-to-one correspondence with the fixing holes 331. One end of the mounting bolt passes through the connecting hole 431 and the corresponding fixing hole 331 in sequence, and is threadedly connected with the fastening nut to realize the connection between the second flange 33 and the fixed flange 43.

[0050] Furthermore, in the present embodiment, the mounting flange 44 on the built-in partial discharge monitoring device 40 is bolted to the connecting flange 60 , and the mounting flange 44 and the connecting flange 60 are sealed by a rubber ring.

[0051] In this embodiment, the fixed flange 43 and the mounting flange 44 are both of standard DN150 size. The total length of the built-in partial discharge monitoring device 40 and the built-in UHF sensor 50 along the X direction is 260 mm.

[0052] Continue to refer to Figure 4 Another embodiment provides a test method for the test platform 1 for the built-in partial discharge monitoring device for converter transformers as described above, comprising the following steps:

[0053] The vacuum sealing test steps are as follows: open the exhaust valve 42 on the built-in partial discharge monitoring device 40, connect the external vacuum pumping system to the exhaust valve 42, vacuum the built-in partial discharge monitoring device 40, and use the pressure increase judgment method. When the vacuum gauge pointer in the vacuum pumping system reaches the preset pressure, continue to vacuum until the vacuum degree is stable; stop vacuuming, close the exhaust valve 42, maintain the first preset time, record the first vacuum value, continue to maintain the second preset time to record the vacuum value again, and calculate the pressure increase value.

[0054] It should be noted that the pressure increase value should be less than 200Pa / h.

[0055] Specifically, the pressure increment judgment method is used to judge the sealing performance of the built-in partial discharge monitoring device 40. When the vacuum gauge pointer on the vacuum system reaches 133Pa, continue to evacuate for 30 minutes until the vacuum degree is stable; then stop evacuating, close the exhaust valve 42, keep it for 10 minutes, record the first vacuum value, continue to keep it for 30 minutes, record the vacuum value again, and calculate the pressure increase value.

[0056] Before the experiment, the support assembly 20 is fixed on the horizontal plate 11 of the vibration generating platform 10, the docking base 30 is installed on the support assembly 20, the built-in UHF sensor 50 is installed on the built-in partial discharge monitoring device 40, and then the built-in partial discharge monitoring device 40 is fixedly connected to the docking base 30.

[0057] Among them, after the sealing and vibration combined test steps and the vacuum sealing test of the built-in partial discharge monitoring device 40 are passed, the positive pressure sealing and vibration combined test of the built-in partial discharge monitoring device 40 is carried out, the oil filling valve 41 and the exhaust valve 42 on the built-in partial discharge monitoring device 40 are opened, and oil is injected into the built-in partial discharge monitoring device 40 through the oil filling valve 41. The gas in the built-in partial discharge monitoring device 40 is completely discharged, and the exhaust valve 42 is closed; the oil injection is continued to maintain the static pressure in the built-in partial discharge monitoring device 40 at 190kPa~200kPa; the power supply on the vibration generating platform 10 is turned on, and the vibration parameters are set so that the vibration generating platform 10 vibrates according to the set vibration parameters. The test lasts for a preset time. During and after the test, the oil leakage of the built-in partial discharge monitoring device 40 is observed.

[0058] Specifically, turn on the power supply on the vibration generating platform 10, set the vibration parameters to a vertical vibration frequency of 100 Hz and a sine wave with an amplitude of 100 um, so that the vibration generating platform 10 vibrates according to the set vibration parameters. The test lasts for 3*24 hours. During and after the test, observe the oil leakage of the built-in partial discharge monitoring device 40.

[0059] The present application provides a test platform 1 and a test method for a built-in partial discharge monitoring device for a converter transformer, wherein the test platform 1 includes a vibration generating platform 10, a support assembly 20, a docking base 30, a built-in partial discharge monitoring device 40 and a built-in ultra-high frequency sensor 50; the support assembly 20 is arranged on the vibration generating platform 10, the bottom end of the support assembly 20 is connected to the horizontal plate 11 of the vibration generating platform 10, one end of the docking base 30 is sealedly connected to one side of the support assembly 20, the end of the docking base 30 away from the support assembly 20 is sealedly connected to the built-in partial discharge monitoring device 40, and the built-in ultra-high frequency sensor 50 is connected to the end of the built-in partial discharge monitoring device 40 away from the docking base 30 through a connecting flange 60; the vibration generating platform 10 is used to provide the vibration conditions required for generating a vibration test; the test process is: vacuum sealing test-sealing and vibration combined test; such a setting provides a test platform 1 for the sealing and vibration resistance test of the built-in partial discharge monitoring device 40, thereby avoiding the forced shutdown of the converter transformer due to the sealing and vibration resistance mechanical performance problems of the built-in monitoring device.

[0060] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0061] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A test platform for a built-in partial discharge monitoring device for a converter transformer, characterized in that: It includes a vibration generating table, a supporting assembly, a docking base, a built-in partial discharge monitoring device and a built-in UHF sensor; The support assembly is arranged on the vibration generating platform, the bottom end of the support assembly is connected to the horizontal plate of the vibration generating platform, one end of the docking base is sealedly connected to one side of the support assembly, one end of the docking base away from the support assembly is sealedly connected to the built-in partial discharge monitoring device, and the built-in ultra-high frequency sensor is connected to one end of the built-in partial discharge monitoring device away from the docking base through a connecting flange; The vibration generating platform is used to provide the vibration conditions required for the vibration test.

2. The test platform for the built-in partial discharge monitoring device of the converter transformer according to claim 1 is characterized in that: The support assembly includes a fixed base plate and a support frame. The bottom surface of the fixed base plate is in contact with the top surface of the horizontal plate. The fixed base plate is connected to the horizontal plate. The bottom end of the support frame is connected to the top surface of the fixed base plate. One end of the docking base is sealed and connected to the side wall near the top of the support frame.

3. The test platform for the built-in partial discharge monitoring device of the converter transformer according to claim 2 is characterized in that: The support assembly also includes two diagonal support rods, which are respectively arranged on opposite sides of the support frame, one end of the diagonal support rod is connected to one side of the support frame, and the other end of the diagonal support rod is connected to the side wall of the fixed base plate.

4. The test platform for the built-in partial discharge monitoring device of the converter transformer according to claim 2 is characterized in that: The supporting frame is in a rectangular parallelepiped shape.

5. The test platform for the built-in partial discharge monitoring device of the converter transformer according to claim 2 is characterized by: The horizontal plate is provided with a plurality of threaded holes, which are arranged in a matrix, with a preset spacing between each two adjacent threaded holes. The fixed base plate is provided with a plurality of through holes, which are arranged one-to-one with the threaded holes, and one end of the fastening bolt passes through the through hole and is screwed into the corresponding threaded hole.

6. The test platform for the built-in partial discharge monitoring device of the converter transformer according to claim 5 is characterized in that: The preset spacing ranges from 90 mm to 110 mm.

7. The test platform for the built-in partial discharge monitoring device of the converter transformer according to claim 1 is characterized by: The docking base is equivalent to simulating the modified manhole cover flange and valve when the built-in partial discharge monitoring device is installed.

8. The test platform for the built-in partial discharge monitoring device of the converter transformer according to claim 2 is characterized by: The docking base includes a first flange, a connecting sleeve and a second flange, and the first flange is connected to the second flange through the connecting sleeve.

9. The test platform for the built-in partial discharge monitoring device of the converter transformer according to claim 8 is characterized by: A sealing groove is formed on a side of the first flange away from the connecting sleeve, and a sealing ring is arranged in the sealing groove so that the first flange is sealed and connected to the side wall close to the top end of the supporting frame.

10. A test method for a test platform for a built-in partial discharge monitoring device for a converter transformer according to any one of claims 1 to 9, characterized in that: The steps include: The vacuum sealing test steps include opening the exhaust valve on the built-in partial discharge monitoring device, connecting the external vacuum pumping system to the exhaust valve, vacuuming the built-in partial discharge monitoring device, and using the pressure increment judgment method. When the vacuum gauge pointer in the vacuum pumping system reaches the preset pressure, continue to vacuum until the vacuum degree is stable; stop vacuuming, close the exhaust valve, maintain the first preset time, record the first vacuum value, continue to maintain the second preset time, record the vacuum value again, and calculate the pressure increase value; After the sealing and vibration combined test steps and the vacuum sealing test of the built-in partial discharge monitoring device are passed, the oil filling valve and the exhaust valve on the built-in partial discharge monitoring device are opened, and oil is injected into the built-in partial discharge monitoring device through the oil filling valve. The gas in the built-in partial discharge monitoring device is completely discharged, and the exhaust valve is closed; the oil injection is continued to maintain the static pressure in the built-in partial discharge monitoring device at 190kPa~200kPa; the power supply on the vibration generating table is turned on, and the vibration parameters are set so that the vibration generating table vibrates according to the set vibration parameters. The test lasts for a preset time. During and after the test, the oil leakage of the built-in partial discharge monitoring device is observed.

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