Sealing experiment device and control method, control device and sealing experiment system

Abstract

The application provides a sealed experiment device and a control method, a control device and a sealed experiment system. The control method comprises the following steps: setting multiple experiment conditions, the experiment conditions are used for simulating the conditions of internal factors and / or external factors of the sealed structure in the operation process of the transformer; in the experiment conditions in sequence, the inflation device is controlled to inflate or extract gas into the sealed structure, the current gas pressure value of the inflation device is obtained, the first gas pressure value is obtained, after the duration of the stop of the inflation or the extraction of the inflation device reaches the predetermined length of time, the current gas pressure value of the inflation device is obtained, the second gas pressure value is obtained; and the sealing property of the sealed structure is determined according to the first gas pressure value and the second gas pressure value. The method solves the problem that the prior art lacks a method for testing the sealing property of the sealing structure of the bushing head under the coupling action of multiple internal and external factors of the transformer.

Description

Technical Field

[0001] This invention relates to the field of sealing test, and more specifically, to a sealing test apparatus and control method, control device, computer-readable storage medium, and sealing test system. Background Technology

[0002] Transformer bushings used in power systems operate in harsh substation environments, enduring high temperatures, high humidity, wind, solar radiation, salt spray, and other environmental factors. During operation, the bushings are constantly energized, generating significant heat in their internal conductive rods, and are subjected to low-frequency vibrations and tensile forces. The bushing head sealing structure, as the primary component connecting the bushing to the external atmosphere, also bears the combined effects of these environmental factors. The rubber sealing rings within this structure are prone to thermal and oxidative aging and wear, leading to seal failure. This allows moisture to enter the bushing, causing internal dampness and insulation faults such as bushing discharge. In severe cases, it can result in bushing and transformer fires, causing substantial economic losses.

[0003] Existing casing sealing tests mainly involve heating the casing to a certain temperature (e.g., 75°C) and maintaining it for a certain time (e.g., 12 hours), while applying a positive pressure 0.1 MPa ± 0.01 MPa higher than the highest operating pressure inside the casing for leak detection. No research or application of casing head structure sealing tests under the coupled effects of internal and external factors has been found, nor have any related sealing test methods been discovered. Summary of the Invention

[0004] The main objective of this application is to provide a sealing test equipment and control method, control device, computer-readable storage medium and sealing test system, so as to at least solve the problem that the prior art lacks a method for testing the sealing performance of the bushing head sealing structure under the coupled effects of multiple internal and external factors of a transformer.

[0005] To achieve the above objectives, according to one aspect of this application, a sealing test device is provided, comprising: a vibration test platform for simulating vibrations generated during transformer operation; a constant temperature and humidity aging chamber placed on the vibration test platform, the constant temperature and humidity aging chamber for simulating the temperature and humidity conditions of the external environment during transformer operation; a sealing structure fixed in the constant temperature and humidity aging chamber, the sealing structure simulating the sealing structure of the bushing head of the transformer, the bushing head being the end of the transformer bushing located outside the transformer housing; a copper rod, a portion of which is located within the sealing structure, the copper rod simulating the conductive rod of the transformer, the conductive rod portion being located within the bushing; and a stepper motor connected to the copper rod, the stepper motor being used to axially displace the copper rod and provide... A copper rod is subjected to axial or radial force; a heating device, connected to the copper rod, is used to heat the copper rod to simulate the heating of the conductive rod under energized conditions during transformer operation; a salt spray generator, installed on the inner wall of the constant temperature and humidity aging chamber, is used to simulate the salt spray conditions of the external environment during transformer operation, and includes a pH sensor; an inflation device, connected to the sealing structure via a pipeline, is used to fill or extract gas from the sealing structure; a tension / compression sensor, connected to the copper rod, is used to measure the force applied to the copper rod by the stepper motor; a displacement sensor, connected to the copper rod, is used to monitor the axial displacement of the copper rod; and a first temperature sensor, connected to the copper rod, is used to measure the temperature of the copper rod.

[0006] Optionally, the sealing structure includes an upper metal flange structure, a middle cavity, and a lower support base. The upper flange structure includes a sealing groove. The support base is fixed in the constant temperature and humidity aging chamber. The sealing test equipment further includes: a sleeve located in the middle cavity, which is used to fix the copper rod so that the copper rod can move axially when the stepper motor drives the copper rod; and a sealing ring placed in the sealing groove to ensure the sealing performance at the connection between the copper rod and the sealing structure.

[0007] To achieve the above objectives, according to one aspect of this application, a control method for a sealing test device is provided. The control method includes: setting multiple test conditions to simulate the internal and / or external factors affecting the sealing structure during transformer operation; the internal factors include the temperature of the conductive rod, the pressure, tension, and friction of the rod on the sealing structure; the external factors include the temperature, humidity, and salt spray of the environment in which the sealing structure is located during transformer operation, and the vibration generated by the transformer operation; sequentially, under each test condition, controlling an inflation device to inject or extract gas into the sealed structure, obtaining the current gas pressure value of the inflation device to obtain a first gas pressure value; after the inflation or extraction of gas by the inflation device has stopped for a predetermined duration, obtaining the current gas pressure value of the inflation device to obtain a second gas pressure value; and determining the sealing performance of the sealing structure based on the first gas pressure value and the second gas pressure value.

[0008] Optionally, under the experimental conditions, the inflation device is controlled to inflate or depress a predetermined volume of gas into the sealed structure, and the current pressure value of the inflation device is obtained to obtain a first pressure value. After the inflation device stops inflating or depressing for a first predetermined duration, the current pressure value of the inflation device is obtained to obtain a second pressure value. This includes: controlling the inflation device to inflate the sealed structure with gas at a first predetermined pressure, obtaining the current pressure value of the inflation device, and obtaining the first pressure value; obtaining a first moment corresponding to the first pressure value, where the first moment is the moment when inflation stops; and obtaining the current pressure value of the inflation device at a second moment to obtain the second pressure value, where the second moment is the moment after the first moment.

[0009] Optionally, under the experimental conditions, the inflation device is controlled to inflate or depress gas into the sealed structure, and the current gas pressure value of the inflation device is obtained to obtain a first gas pressure value. After the duration of the inflation or depressurization of the inflation device reaches a first predetermined time, the current gas pressure value of the inflation device is obtained to obtain a second gas pressure value. The method further includes: controlling the inflation device to depress gas from the sealed structure until the gas pressure value of the inflation device is the first predetermined gas pressure value, such that the first gas pressure value is equal to the first predetermined gas pressure value; after the timing period after the gas pressure value of the inflation device reaches the first predetermined gas pressure value reaches the first predetermined time, the current gas pressure value of the inflation device is obtained to obtain the second gas pressure value.

[0010] Optionally, under the experimental conditions, the inflation device is controlled to inflate or depress gas into the sealed structure, and the current gas pressure value of the inflation device is obtained to obtain a first gas pressure value. After the inflation device stops inflating or depressing for a first predetermined duration, the current gas pressure value of the inflation device is obtained to obtain a second gas pressure value. The method further includes: controlling the inflation device to depress gas from the sealed structure until the gas pressure value of the inflation device is a second predetermined gas pressure value; stopping the depressing of gas from the sealed structure when the gas pressure value of the inflation device reaches the second predetermined gas pressure value and the duration of continued depressing of gas from the sealed structure reaches the second predetermined duration; obtaining the current gas pressure value of the inflation device to obtain the first gas pressure value after a third predetermined duration has elapsed since obtaining the first gas pressure value; and obtaining the current gas pressure value of the inflation device to obtain the second gas pressure value after a third predetermined duration has elapsed since obtaining the first gas pressure value.

[0011] Optionally, determining the sealing performance of the sealing structure based on the first and second pressure values ​​includes: obtaining the cavity gas volume of the sealed structure; calculating a first difference and a second difference, where the first difference is the difference between the first and second pressure values, and the second difference is the difference between the second time and the first time; calculating the annual total leakage rate based on the cavity gas volume, the first difference, and the second difference, where the leakage rate characterizes the gas leakage situation in the sealing structure; and determining that the sealing structure has good sealing performance under positive pressure conditions when the annual total leakage rate is less than a predetermined value, where the positive pressure conditions are conditions where the pressure inside the sealing structure is greater than the external pressure.

[0012] Optionally, determining the sealing performance of the sealing structure based on the first air pressure value and the second air pressure value includes: calculating a third difference, where the third difference is the difference between the second air pressure value and the first air pressure value; and determining that the sealing structure has good sealing performance under negative pressure conditions when the third difference is less than or equal to the first predetermined air pressure value, where the negative pressure conditions are conditions where the pressure inside the sealing structure is less than the external pressure.

[0013] Optionally, determining the sealing performance of the sealing structure based on the first air pressure value and the second air pressure value includes: calculating a fourth difference value, where the fourth difference value is the difference between the second air pressure value and the first air pressure value; and determining that the sealing structure has good sealing performance under negative pressure conditions when the fourth difference value is less than or equal to the second predetermined air pressure value.

[0014] Optionally, determining the sealing performance of the sealing structure based on the first air pressure value and the second air pressure value includes: determining that the sealing structure has good sealing performance when it is determined that the sealing structure has good sealing performance under positive pressure conditions and under negative pressure conditions, wherein the positive pressure conditions are conditions where the pressure inside the sealing structure is greater than the external pressure, and the negative pressure conditions are conditions where the pressure inside the sealing structure is less than the external pressure; and determining that the sealing structure has poor sealing performance when it is determined that the sealing structure has poor sealing performance under positive pressure conditions or under negative pressure conditions.

[0015] According to another aspect of this application, a control device for a sealing test apparatus is provided. The control device includes: a setting unit for setting multiple test conditions, which are used to simulate internal and / or external factors of the sealing structure during transformer operation. The internal factors include the temperature of the guide rod, the pressure, tension, and friction of the guide rod on the sealing structure, and the external factors include the temperature, humidity, and salt spray of the environment in which the sealing structure is located during transformer operation, as well as the vibration generated by the transformer operation; an acquisition unit for sequentially controlling an inflation device to inject or extract gas into the sealed structure under the test conditions, acquiring the current gas pressure value of the inflation device to obtain a first gas pressure value, and acquiring the current gas pressure value of the inflation device after the inflation or extraction of the inflation device has stopped for a predetermined duration to obtain a second gas pressure value; and a judgment unit for determining the sealing performance of the sealing structure based on the first gas pressure value and the second gas pressure value.

[0016] According to another aspect of this application, a computer-readable storage medium is provided, the computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device on which the computer-readable storage medium is located to perform any of the methods described.

[0017] According to another aspect of this application, a sealing test system is provided, the sealing test system including any of the sealing test devices described above, the test system further including one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including methods for performing any of the methods described above.

[0018] Optionally, the experimental system further includes: a signal amplification and filtering module, which is communicatively connected to a tension / compression sensor, a displacement sensor, a first temperature sensor, a pressure sensor, a pH sensor, a second temperature sensor, a humidity sensor, and an acceleration sensor, respectively. The signal amplification and filtering module amplifies and filters the analog signals monitored by the tension / compression sensor, the displacement sensor, the first temperature sensor, the pressure sensor, the pH sensor, the second temperature sensor, the humidity sensor, and the acceleration sensor to obtain a target analog signal; a data acquisition module, which is communicatively connected to the signal amplification and filtering module, for acquiring the target analog signal; and an A / D conversion module, which is communicatively connected to the data acquisition module, for converting the target analog signal acquired by the data acquisition module into a digital signal. The host display and analysis module is communicatively connected to both the A / D conversion module and the display screen. This module analyzes the sealing performance of the sealing structure based on the digital signal, obtains the analysis result, and displays the corresponding digital quantity and the analysis result on the display screen. The data transmission module is communicatively connected to both the A / D conversion module and the host display and analysis module. This module transmits the digital signal to the host display and analysis module. The control module is communicatively connected to the signal amplification and filtering module, the data acquisition module, the A / D conversion module, the host display and analysis module, and the data transmission module. This control module controls the operation of these modules.

[0019] Applying the technical solution of this application, in the control method of the above-mentioned sealing test equipment, firstly, multiple experimental conditions are set. These experimental conditions are used to simulate the internal and / or external factors of the sealing structure during transformer operation. The internal factors include the temperature of the conductive rod, the pressure, tension, and friction of the conductive rod on the sealing structure, and the external factors include the temperature, humidity, and salt spray of the environment in which the sealing structure is located during transformer operation, as well as the vibration generated by the transformer operation. Then, under the above experimental conditions, the gas filling device is controlled to fill or extract gas into the sealed structure, and the current gas pressure value of the gas filling device is obtained to obtain a first gas pressure value. After the duration of the gas filling or extraction device stopping reaches a predetermined time, the current gas pressure value of the gas filling device is obtained to obtain a second gas pressure value. Finally, the sealing performance of the sealing structure is determined based on the first gas pressure value and the second gas pressure value. This method simulates the temperature and humidity conditions of the external environment during transformer operation using the aforementioned constant temperature and humidity aging chamber, simulates the vibration generated during transformer operation using the aforementioned vibration test platform, simulates the displacement of the conductive rod during transformer operation using the aforementioned stepper motor-driven copper rod, simulates the heating of the conductive rod during transformer operation using the aforementioned heating device, and simulates the salt spray conditions of the external environment during transformer operation using the aforementioned salt spray generator. This method simulates the coupling effect of complex internal and external factors during transformer operation, solving the problem of the lack of a method in the prior art for testing the sealing performance of the bushing head sealing structure under the coupling effect of multiple internal and external factors of a transformer. Attached Figure Description

[0020] Figure 1 A hardware structure block diagram of a mobile terminal for performing a control method for a sealing experimental device according to an embodiment of this application is shown.

[0021] Figure 2 A connection diagram of a sealing test apparatus provided according to an embodiment of this application is shown;

[0022] Figure 3 A schematic flowchart of a control method for a sealing test apparatus according to an embodiment of this application is shown.

[0023] Figure 4 A schematic flowchart of a sealing performance testing method for a sealing structure according to another embodiment of this application is shown;

[0024] Figure 5 A structural block diagram of a control device for a sealing test apparatus provided according to an embodiment of this application is shown;

[0025] Figure 6A connection diagram of a sealing test system provided according to an embodiment of this application is shown;

[0026] The above figures include the following reference numerals:

[0027] 1. Stepper motor; 2. Tension / compression sensor; 3. Displacement sensor; 4. First temperature sensor; 5. Copper rod; 6. Heating device; 7. Inflation device; 8. Sealing groove; 9. Sealing ring; 10. Upper metal flange structure; 11. Middle cavity; 12. Sleeve; 13. Lower support base; 14. Salt spray generator; 15. Constant temperature and humidity aging chamber; 16. Vibration test platform; 17. Acceleration sensor; 18. Second temperature sensor; 19. Humidity sensor. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0030] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0031] As described in the background section, existing bushing sealing tests mainly involve heating the bushing to a certain temperature and maintaining it for a certain time, while simultaneously applying a positive pressure 0.1 MPa ± 0.01 MPa higher than the highest operating pressure inside the bushing for leak detection. To address the lack of a method in the existing technology for testing the sealing performance of the bushing head sealing structure under the coupled effects of multiple internal and external factors of a transformer, embodiments of this application provide a sealing test device and control method, control apparatus, computer-readable storage medium, and sealing test system.

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0033] The methods and embodiments provided in this application can be executed on a mobile terminal, computer terminal, or similar computing device. Taking running on a mobile terminal as an example, Figure 1 This is a hardware structure block diagram of a mobile terminal for a control method of a sealing experimental device according to an embodiment of the present invention. Figure 1 As shown, a mobile terminal may include one or more ( Figure 1 Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. The mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal described above. For example, the mobile terminal may also include components that are more... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0034] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the control method of the sealed experimental device in this embodiment of the invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thereby implementing the above-described method. The memory 104 may include high-speed random access memory and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the aforementioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or send data via a network. Specific examples of the aforementioned networks may include wireless networks provided by the mobile terminal's communication provider. In one example, the transmission device 106 includes a network interface controller (NIC), which can be connected to other network devices via a base station to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0035] This embodiment provides a sealed experimental device for simulating the coupling effects of complex internal and external factors during transformer operation. Figure 2 This is a schematic diagram of a sealing test apparatus according to an embodiment of this application, such as... Figure 2 As shown, the device includes a stepper motor 1, a tension / compression sensor 2, a displacement sensor 3, a first temperature sensor 4, a copper rod 5, a heating device 6, an air filling device 7, a salt spray generator 14, a constant temperature and humidity aging chamber 15, a vibration test platform 16, an acceleration sensor 17, a second temperature sensor 18, a humidity sensor 19, and a sealing structure. The sealing structure consists of an upper metal flange structure 10, a central cavity 11, a lower support base 13, and a sleeve 12. The upper metal flange structure includes a sealing groove 8 and a sealing ring 9. The following will combine... Figure 2 The sealing test equipment described above is explained in detail below:

[0036] Vibration test platform 16, the above-mentioned vibration test platform 16 is used to simulate the vibration generated during the operation of the transformer;

[0037] Specifically, during the operation of a transformer, the bushings are subjected to low-frequency vibrations of the transformer for a long time. In order to make the experimental simulation results closer to the natural working conditions, this application uses a vibration test platform to apply vibration to the experimental equipment to simulate the vibration generated during the operation of the transformer. In order to accurately control the frequency and amplitude of the vibration, the vibration test platform 16 is equipped with an acceleration sensor 17.

[0038] The constant temperature and humidity aging chamber 15 is placed on the vibration test platform mentioned above. The constant temperature and humidity aging chamber 15 is used to simulate the temperature and humidity conditions of the external environment during the operation of the transformer.

[0039] Specifically, during the operation of a transformer, the bushing is subjected to environmental factors such as high temperature and rain for a long time. In order to make the experimental simulation results closer to the natural working conditions, this application uses a constant temperature and humidity aging chamber to adjust the temperature and humidity of the environment in which the sealing structure is located to simulate the natural environment in which the bushing head sealing structure is located during the operation of the transformer. In order to accurately control the temperature and humidity, a second temperature sensor 18 and a humidity sensor 19 are installed on the inner wall of the constant temperature and humidity aging chamber 15.

[0040] A sealing structure is fixed in the constant temperature and humidity aging chamber 15. The sealing structure is used to simulate the sealing structure of the bushing head of the transformer. The bushing head is the end of the bushing of the transformer located outside the casing of the transformer.

[0041] Specifically, a transformer bushing is a structure used for insulation, so the bushing head is provided with a sealing structure to ensure good sealing of the bushing during use. Therefore, this application proposes a sealing structure to simulate the sealing structure of the transformer bushing head during the experiment.

[0042] Copper rod 5, a portion of which is located in the sealing structure, is used to simulate the conductive rod of the transformer, and a portion of which is located in the bushing.

[0043] Specifically, the copper rod 5 is inserted into the sealing groove 8 of the sealing structure and sealed by the sealing ring 9, which is used to simulate the sealing effect of the transformer bushing head sealing structure on the conductive rod in the bushing.

[0044] Stepper motor 1 is connected to the copper rod mentioned above. Stepper motor 1 is used to make the copper rod 5 axially displace and to apply axial or radial force to the copper rod 5.

[0045] Specifically, during transformer operation, the bushing is subjected to factors such as tension, pressure and friction of the conductive rod for a long time. In order to make the experimental simulation results closer to the natural working conditions, this application uses a stepper motor to control the copper rod to move and apply tension or pressure to the sealing structure to simulate the tension, pressure and friction of the conductive rod on the bushing head sealing structure during transformer operation.

[0046] Heating device 6 is connected to the copper rod 5. The heating device 6 is used to heat the copper rod 5 to simulate the heating of the conductive rod under energized conditions during transformer operation.

[0047] Specifically, during transformer operation, the conductive rod is energized for a long time, causing the conductive rod to heat up significantly. The bushing is subjected to the heat generated by the conductive rod for an extended period. To make the experimental simulation results more closely resemble natural operating conditions, this application uses a heating device to heat the copper rod to simulate the heat generated by the conductive rod on the bushing during transformer operation.

[0048] Salt spray generator 14 is installed on the inner wall of the constant temperature and humidity aging chamber 15. The salt spray generator 14 is used to simulate the salt spray conditions of the external environment during the operation of the transformer.

[0049] Specifically, during the operation of a transformer, the bushings are subjected to the effects of salt spray from the external environment for a long time. In order to make the experimental simulation results closer to the natural working conditions, in one embodiment of this application, a salt spray generator is used to spray a sodium chloride solution with a fixed pH value to simulate the effects of salt spray from the external environment on the bushings during the operation of the transformer. In order to accurately control the pH value of the salt spray, the salt spray generator 14 is equipped with a pH sensor.

[0050] An inflation device 7 is connected to the sealing structure via a pipeline. The inflation device 7 is used to inflate or extract gas from the sealing structure.

[0051] Specifically, in order to test the sealing performance of the above-mentioned sealing structure, this application uses the above-mentioned inflation device 7 to fill or extract gas into the above-mentioned sealing structure to change the gas pressure in the sealing structure, and then waits for a certain period of time to measure the gas pressure in the sealing structure. The sealing performance of the sealing structure is determined by the change in gas pressure. In order to accurately control the amount of gas filled or extracted, the above-mentioned inflation device 7 is equipped with a pressure sensor.

[0052] The tension / compression sensor 2 is connected to the copper rod 5 and is used to measure the force applied to the copper rod 5 by the stepper motor 1.

[0053] Specifically, in order to precisely control the pressure or force applied by the stepper motor 1 to the copper rod 5 on the sealing structure, the copper rod 5 is connected to the tension / compression sensor 2.

[0054] Displacement sensor 3 is connected to the copper rod 5. The displacement sensor 3 is used to monitor the axial displacement of the copper rod 5.

[0055] Specifically, in order to accurately control the displacement of the copper rod 5 controlled by the stepper motor 1, the copper rod 5 is connected to the displacement sensor 3.

[0056] The first temperature sensor 4 is connected to the copper rod 5 and is used to measure the temperature of the copper rod.

[0057] Specifically, in order to precisely control the heating device 6 to heat the copper rod 5, simulating the heating effect of the conductive rod on the bushing during transformer operation, the copper rod 5 is connected to the first temperature sensor 4.

[0058] To achieve better experimental results, in one optional embodiment, the sealing structure includes an upper metal flange structure, a middle cavity, and a lower support base. The upper flange structure includes a sealing groove, and the support base is fixed in the constant temperature and humidity aging chamber. The experimental equipment also includes:

[0059] Sleeve 12 is located in the central cavity and is used to fix copper rod 5 so that copper rod moves axially when the stepper motor drives copper rod.

[0060] Specifically, in order to control the movement direction of the copper rod 5 under the control of the stepper motor 1 to be axial, the sleeve 12 is installed in the middle cavity of the sealing structure to fix the movement direction of the copper rod 5.

[0061] The sealing ring 9 is placed in the sealing groove 8 to ensure the sealing performance at the connection between the copper rod 5 and the sealing structure.

[0062] This embodiment provides a control method for a sealed experimental device that runs on a mobile terminal, computer terminal, or similar computing device. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Also, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0063] Figure 3 This is a flowchart of a control method for a sealing test apparatus according to an embodiment of this application. Figure 3 As shown, the method includes the following steps:

[0064] Step S201: Set multiple experimental conditions. The experimental conditions are used to simulate the internal and / or external factors of the sealing structure during transformer operation. The internal factors include the temperature of the conductive rod, the pressure, tension and friction of the conductive rod on the sealing structure, and the external factors include the temperature, humidity and salt spray of the environment in which the sealing structure is located during transformer operation, as well as the vibration generated by transformer operation.

[0065] Specifically, based on the actual outdoor working environment temperature range of the sleeve head's sealing structure, normal operating conditions 1 to 4 are set sequentially, and then extreme operating conditions 1 to 4 exceeding the above temperature range are set sequentially. The above temperature range is -25℃ to 40℃. For the above 8 operating conditions, the values ​​of temperature and humidity in the constant temperature and humidity aging chamber, salt spray generated by the salt spray generator, vibration generated by the vibration test platform, tension and pressure generated by the stepper motor, heating temperature of the copper rod, movement speed, and displacement are set as follows:

[0066] Normal operating condition 1: The temperature and humidity of the chemical treatment chamber are set at -25℃ and the relative humidity is 100%. The salt spray generated by the salt spray generator should be a sodium chloride solution with a mass percentage concentration of 5% ± 1% and a pH value of 6.5~7.3 (measured at 25℃). The vibration test platform is set to generate a vibration frequency of 100Hz, and the horizontal / vertical acceleration is 0.2g / 0.13g (e.g., magnitude 8 earthquake). The stepper motor is set to generate a tension of 2.5kN and a pressure of 2.5kN. The copper rod is heated to 55℃, and the speed of the copper rod's up-and-down reciprocating movement is ±0.1m / s, and the displacement is ±0.1m.

[0067] Normal operating condition 2: The temperature and humidity of the chemical treatment chamber are set at -25℃ and the relative humidity is 100%. The salt spray generated by the salt spray generator should be a sodium chloride solution with a mass percentage concentration of 5% ± 1% and a pH value of 3.0~3.3 (measured at 25℃). The vibration test platform is set to generate a vibration frequency of 100Hz, and the horizontal / vertical acceleration is 0.2g / 0.13g (e.g., magnitude 8 earthquake). The stepper motor is set to generate a tension of 2.5kN and a pressure of 2.5kN. The copper rod is heated to 55℃, and the up-and-down reciprocating speed of the copper rod is ±0.1m / s, and the displacement is ±0.1m.

[0068] Normal operating condition 3: The temperature and humidity of the chemical treatment chamber are set at 40℃ and 100% relative humidity. The salt spray generated by the salt spray generator should be a sodium chloride solution with a mass percentage concentration of 5% ± 1% and a pH value of 6.5~7.3 (measured at 25℃). The vibration test platform is set to generate a vibration frequency of 100Hz, and the horizontal / vertical acceleration is 0.2g / 0.13g (e.g., magnitude 8 earthquake). The stepper motor is set to generate a tension of 2.5kN and a pressure of 2.5kN. The copper rod is heated to 120℃, and the up-and-down reciprocating speed of the copper rod is ±0.1m / s, and the displacement is ±0.1m.

[0069] Normal operating condition 4: The temperature and relative humidity of the chemical treatment chamber are set at 40℃ and 100% respectively. The salt spray generated by the salt spray generator should be a sodium chloride solution with a mass percentage concentration of 5% ± 1% and a pH value of 3.0~3.3 (measured at 25℃). The vibration test platform is set to generate a vibration frequency of 100Hz, and the horizontal / vertical acceleration is 0.2g / 0.13g (e.g., magnitude 8 earthquake). The stepper motor is set to generate a tension of 2.5kN and a pressure of 2.5kN. The copper rod is heated to 120℃, and the up-and-down reciprocating speed of the copper rod is ±0.1m / s, and the displacement is ±0.1m.

[0070] Extreme Condition 1: The temperature and humidity of the chemical treatment chamber are set at -30℃ and relative humidity at 100%. The salt spray generated by the salt spray generator should be a sodium chloride solution with a mass percentage concentration of 5% ± 1% and a pH value of 6.5~7.3 (measured at 25℃). The vibration test platform is set to generate a vibration frequency of 100Hz, and the horizontal / vertical acceleration is 0.4g / 0.26g (magnitude 9 earthquake). The stepper motor is set to generate a tension of 5kN and a pressure of 5kN. The copper rod is heated to 50℃, and the up-and-down reciprocating speed of the copper rod is ±0.2m / s, and the displacement is ±0.2m.

[0071] Extreme Condition 2: The temperature and humidity of the chemical treatment chamber are set at -30℃ and relative humidity at 100%. The salt spray generated by the salt spray generator should be a sodium chloride solution with a mass percentage concentration of 5% ± 1% and a pH value of 3.0 to 3.3 (measured at 25℃). The vibration test platform is set to generate a vibration frequency of 100Hz, and the horizontal / vertical acceleration is 0.4g / 0.26g (magnitude 9 earthquake). The stepper motor is set to generate a tension of 5kN and a pressure of 5kN. The copper rod is heated to 50℃, and the speed of the copper rod's up-and-down reciprocating movement is ±0.2m / s, and the displacement is ±0.2m.

[0072] Extreme Condition 3: The temperature and humidity of the chemical treatment chamber are set at 45℃ and 100% relative humidity. The salt spray generated by the salt spray generator should be a sodium chloride solution with a mass percentage concentration of 5% ± 1% and a pH value of 6.5~7.3 (measured at 25℃). The vibration test platform is set to generate a vibration frequency of 100Hz, and the horizontal / vertical acceleration is 0.4g / 0.26g (magnitude 9 earthquake). The stepper motor is set to generate a tension of 5kN and a pressure of 5kN. The copper rod is heated to 125℃, and the up-and-down reciprocating speed of the copper rod is ±0.2m / s, and the displacement is ±0.2m.

[0073] Extreme Condition 4: The temperature and humidity of the chemical treatment chamber are set at 45℃ and 100% relative humidity. The salt spray generated by the salt spray generator should be a sodium chloride solution with a mass percentage concentration of 5% ± 1% and a pH value of 3.0~3.3 (measured at 25℃). The vibration test platform is set to generate a vibration frequency of 100Hz, and the horizontal / vertical acceleration is 0.4g / 0.26g (magnitude 9 earthquake). The stepper motor is set to generate a tension of 5kN and a pressure of 5kN. The copper rod is heated to 125℃, and the up-and-down reciprocating speed of the copper rod is ±0.2m / s, and the displacement is ±0.2m.

[0074] It should be noted that the aforementioned internal and external multi-factor effects can be applied sequentially as described above, simultaneously, or in a different order, as long as it is ensured that the application of each factor does not affect the normal operation of other factors or equipment.

[0075] Step S202: Under the above experimental conditions, control the inflation device to inflate or extract gas into the sealed structure, and obtain the current gas pressure value of the inflation device to obtain the first gas pressure value. After the inflation device stops inflating or extracting gas for a predetermined duration, obtain the current gas pressure value of the inflation device to obtain the second gas pressure value.

[0076] Specifically, firstly, the experimental equipment is controlled to adjust the environment of the sealing structure to normal operating condition 1. Under this condition, the inflation device is controlled to inject or extract gas into the sealed structure. Then, by detecting the pressure change in the sealed structure, it is determined whether there is gas exchange between the sealing structure and the outside environment, thereby judging the sealing performance of the sealing structure. Next, the experimental equipment is controlled to sequentially adjust the environment of the sealing structure to normal operating conditions 2-4 and extreme operating conditions 1-4, and the sealing performance of the sealing structure is tested under each of these conditions to obtain the sealing performance of the sealing structure under different environments.

[0077] Step S203: Determine the sealing performance of the sealing structure based on the first air pressure value and the second air pressure value.

[0078] Specifically, the first and second air pressure values ​​can reflect the air pressure changes in the sealed structure, whether there is gas exchange between the sealed structure and the outside world, and thus determine the sealing performance of the sealed structure.

[0079] In this embodiment, firstly, multiple experimental conditions are set to simulate the internal and / or external factors affecting the sealing structure during transformer operation. The internal factors include the temperature of the conductive rod, the pressure, tension, and friction of the rod on the sealing structure, and the external factors include the temperature, humidity, and salt spray of the environment in which the sealing structure is located during transformer operation, as well as the vibration generated by the transformer operation. Then, under the aforementioned experimental conditions, the gas filling device is controlled to fill or extract gas into the sealed structure, and the current gas pressure value of the gas filling device is obtained to obtain a first gas pressure value. After the gas filling or extraction device stops for a predetermined duration, the current gas pressure value of the gas filling device is obtained to obtain a second gas pressure value. Finally, the sealing performance of the sealing structure is determined based on the first and second gas pressure values. This method simulates the temperature and humidity conditions of the external environment during transformer operation using the aforementioned constant temperature and humidity aging chamber, simulates the vibration generated during transformer operation using the aforementioned vibration test platform, simulates the displacement of the conductive rod during transformer operation using the aforementioned stepper motor-driven copper rod, simulates the heating of the conductive rod during transformer operation using the aforementioned heating device, and simulates the salt spray conditions of the external environment during transformer operation using the aforementioned salt spray generator. This method simulates the coupling effect of complex internal and external factors during transformer operation, solving the problem of the lack of a method in the prior art for testing the sealing performance of the bushing head sealing structure under the coupling effect of multiple internal and external factors of a transformer.

[0080] In order to obtain the air pressure change in the cavity of the sealing structure, in an optional embodiment, step S202 includes:

[0081] Step S2021: Control the inflation device to inject gas at a first predetermined pressure into the sealing structure, obtain the current gas pressure value of the inflation device, and obtain the first gas pressure value.

[0082] Specifically, in one embodiment of this application, the inflation device is controlled to fill the central cavity of the sealing structure with gas at 0.3 MPa. The gas can be high-purity nitrogen or SF6 gas. The pressure sensor built into the inflation device records the current gas pressure value K1 of the central cavity, which is the first gas pressure value.

[0083] Step S2022: Obtain the first moment corresponding to the first air pressure value mentioned above, where the first moment is the moment when inflation stops;

[0084] Specifically, the air pressure value K1 in the central cavity after inflation is recorded by the pressure sensor built into the inflation device, and the time t1 at this time is also recorded.

[0085] Step S2023: Obtain the current air pressure value of the inflation device at the second time point to obtain the second air pressure value. The second time point is the time after the first time point.

[0086] Specifically, after recording time t1, the current air pressure value K2 of the central cavity is recorded by the pressure sensor built into the inflation device at a certain time. The aforementioned certain time is the second time t2, which can be any time after the first time.

[0087] In order to obtain the air pressure change in the cavity of the sealing structure, in an optional embodiment, step S202 includes:

[0088] Step S2024: Control the inflation device to extract the gas from the sealing structure until the air pressure value of the inflation device is a first predetermined air pressure value, so that the first air pressure value is equal to the first predetermined air pressure value.

[0089] Specifically, in another embodiment of this application, the inflation device is controlled to extract gas from the central cavity of the sealing structure until the pressure value of the pressure sensor is 5 Pa, at which point the vacuuming stops, and the current pressure value A of the central cavity, i.e., the first predetermined pressure value of 5 Pa, is recorded by the pressure sensor built into the inflation device.

[0090] Step S2025: After the timing period following the inflation device reaching the first predetermined inflation value reaches the first predetermined inflation value, the current inflation value of the inflation device is obtained to obtain the second inflation value.

[0091] Specifically, in one embodiment of this application, after obtaining the first air pressure value A, after 0.5 hours, the current air pressure value B of the central cavity, i.e. the second air pressure value, is recorded by the pressure sensor built into the inflation device.

[0092] In order to obtain the air pressure change in the cavity of the sealing structure, in an optional embodiment, step S202 includes:

[0093] Step S2026: Control the inflation device to extract the gas from the sealing structure until the air pressure of the inflation device is a second predetermined air pressure value.

[0094] Specifically, in another embodiment of this application, the inflation device is controlled to extract gas from the central cavity of the sealing structure until the pressure value of the pressure sensor is 133 Pa, that is, the second predetermined pressure value is 133 Pa.

[0095] Step S2027: When the air pressure value of the inflation device reaches the second predetermined air pressure value and the duration of extracting gas from the sealing structure reaches the second predetermined duration, the extraction of gas from the sealing structure is stopped.

[0096] Specifically, after the pressure sensor measures the air pressure in the central cavity to be the second predetermined air pressure value, the inflation device is controlled to continue extracting gas from the central cavity for 0.5 hours, and then the extraction of gas from the central cavity is stopped.

[0097] Step S2028: If the duration of the gas extraction from the sealing structure reaches a second predetermined duration, the current gas pressure value of the inflation device is obtained to obtain the first gas pressure value.

[0098] Specifically, after 0.5 hours of evacuation is stopped, the current air pressure value A of the central cavity is recorded by the pressure sensor built into the inflation device, which is the first air pressure value.

[0099] Step S2029: After a third predetermined time has elapsed since the first air pressure value was obtained, the current air pressure value of the inflation device is obtained, and the second air pressure value is obtained.

[0100] Specifically, after obtaining the first air pressure value of 5h, the third predetermined time is 5h. The current air pressure value B of the central cavity is recorded by the pressure sensor built into the inflation device, which is the second air pressure value.

[0101] To determine the sealing performance of the aforementioned sealing structure under positive pressure conditions, in one optional embodiment, step S203 includes:

[0102] Step S20301: Obtain the volume of the cavity gas in the above-mentioned sealed structure;

[0103] Specifically, the volume of the central cavity of the aforementioned sealing structure is fixed. After the gas is filled into the central cavity, its volume is the volume of the central cavity. Let the volume of the gas in the cavity of the aforementioned sealed structure be V.

[0104] Step S20302: Calculate the first difference and the second difference, where the first difference is the difference between the first air pressure value and the second air pressure value, and the second difference is the difference between the second time and the first time.

[0105] Specifically, the difference between the first and second air pressure values ​​can reflect the pressure change in the central cavity. This pressure change is caused by gas exchange between the sealing structure and the outside environment, thus also reflecting the sealing performance of the sealing device. It should be noted that the sealing structure cannot completely isolate air; however, by calculating the time it takes for the pressure change to occur, the rate of pressure change in the sealing structure can be determined, thereby reflecting the rate of gas leakage from the sealing structure.

[0106] Step S20303: Calculate the annual total leakage rate based on the cavity gas volume, the first difference, and the second difference. The annual total leakage rate is used to characterize the gas leakage situation in the sealing structure.

[0107] Specifically, the annual total leakage rate can be calculated using the formula L = V(K2-K1) / (t2-t1).

[0108] Step S20304: If the leakage rate is less than a predetermined value, it is determined that the sealing structure has good sealing performance under positive pressure conditions. The positive pressure conditions are conditions where the pressure inside the sealing structure is greater than the external pressure.

[0109] Specifically, if the calculated total annual leakage rate is less than or equal to 0.5% / year of the gas content in the central cavity of the above-mentioned sealing structure, then the above-mentioned sealing structure is considered to have good sealing performance under positive pressure conditions.

[0110] To determine the sealing performance of the above-mentioned sealing structure under negative pressure conditions, in an optional embodiment, step S203 includes:

[0111] Step S20305: Calculate the third difference, which is the difference between the second air pressure value and the first air pressure value.

[0112] Specifically, the difference between the first air pressure value and the second air pressure value can reflect the air pressure change in the central cavity. The air pressure change in the central cavity is caused by the gas exchange between the sealing structure and the outside world, and thus can also reflect the sealing performance of the sealing device.

[0113] Step S20306: If the third difference is less than or equal to the first predetermined air pressure value, it is determined that the sealing structure has good sealing performance under negative pressure conditions. The negative pressure conditions are conditions where the pressure inside the sealing structure is less than the external pressure.

[0114] Specifically, in one embodiment of this application, when the third difference is less than or equal to the first predetermined air pressure value, i.e., BA≤5Pa, the sealing structure is considered to have good sealing performance under negative pressure conditions.

[0115] To determine the sealing performance of the above-mentioned sealing structure under negative pressure conditions, in an optional embodiment, step S203 includes:

[0116] Step S20307: Calculate the fourth difference, which is the difference between the second air pressure value and the first air pressure value.

[0117] Specifically, the difference between the first air pressure value and the second air pressure value can reflect the air pressure change in the central cavity. The air pressure change in the central cavity is caused by the gas exchange between the sealing structure and the outside world, and thus can also reflect the sealing performance of the sealing device.

[0118] Step S20308: If the fourth difference is less than or equal to the second predetermined air pressure value, it is determined that the sealing structure has good sealing performance under negative pressure conditions.

[0119] Specifically, in one embodiment of this application, when the fourth difference is less than or equal to the first predetermined air pressure value, i.e., BA≤133Pa, the sealing structure is considered to have good sealing performance under negative pressure conditions.

[0120] To definitively determine the sealing performance of the aforementioned sealing structure, in one optional embodiment, step S203 includes:

[0121] Step S20309: After determining that the sealing structure has good sealing performance under positive pressure and under negative pressure, the sealing structure is determined to have good sealing performance. The positive pressure condition is the condition where the pressure inside the sealing structure is greater than the external pressure, and the negative pressure condition is the condition where the pressure inside the sealing structure is less than the external pressure.

[0122] Specifically, based on the sealing test results under the aforementioned positive pressure and negative pressure conditions, if it is determined that the sealing structure has good sealing performance under both positive and negative pressure conditions, then the sealing performance of the aforementioned sealing structure is determined to be good.

[0123] Step S20310: If it is determined that the sealing structure is not sealing properly under positive pressure or under negative pressure, then the sealing structure is determined to be not sealing properly.

[0124] Specifically, based on the sealing test results under the above positive pressure condition and the above negative pressure condition, if it is determined that the sealing structure has poor sealing performance under either the positive pressure condition or the negative pressure condition, then the sealing structure is determined to have poor sealing performance.

[0125] To enable those skilled in the art to better understand the technical solution of this application, the implementation process of the control method of the sealing test equipment of this application will be described in detail below with reference to specific embodiments.

[0126] This embodiment relates to a specific control method for a sealing test device, such as... Figure 4 As shown, it includes the following steps:

[0127] Step S21: Set different experimental conditions according to the working environment of the transformer;

[0128] Step S22: Control the experimental equipment to simulate the above experimental conditions in sequence;

[0129] Step S23: Conduct positive pressure side leakage test and negative pressure side leakage test under each operating condition;

[0130] Step S24: Determine the sealing performance of the sealing structure based on the results of the positive pressure side leakage test and the negative pressure side leakage test. If both test results indicate good sealing performance, the sealing structure is considered to be in good sealing performance. Conversely, if either of the two sealing tests indicates poor sealing performance, the sealing structure is considered to be in poor sealing performance.

[0131] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0132] This application also provides a control device for a sealing experimental apparatus. It should be noted that the control device for the sealing experimental apparatus in this application can be used to execute the control method for the sealing experimental apparatus provided in this application. This device is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that implements a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0133] The control device of the sealing test equipment provided in the embodiments of this application will be described below.

[0134] Figure 5 This is a schematic diagram of the control device of a sealing test apparatus according to an embodiment of this application. Figure 5 As shown, the device includes:

[0135] The setting unit 100 is used to set multiple experimental conditions. The experimental conditions are used to simulate the internal and / or external factors of the sealing structure during the operation of the transformer. The internal factors include the temperature of the guide rod, the pressure, tension and friction of the guide rod on the sealing structure, and the external factors include the temperature, humidity and salt spray of the environment in which the sealing structure is located during the operation of the transformer, as well as the vibration generated by the operation of the transformer.

[0136] Specifically, based on the actual outdoor working environment temperature range of the sleeve head's sealing structure, normal operating conditions 1 to 4 are set sequentially, and then extreme operating conditions 1 to 4 exceeding the above temperature range are set sequentially. The above temperature range is -25℃ to 40℃. For the above 8 operating conditions, the values ​​of temperature and humidity in the constant temperature and humidity aging chamber, salt spray generated by the salt spray generator, vibration generated by the vibration test platform, tension and pressure generated by the stepper motor, heating temperature of the copper rod, movement speed, and displacement are set as follows:

[0137] Normal operating condition 1: The temperature and humidity of the chemical treatment chamber are set at -25℃ and the relative humidity is 100%. The salt spray generated by the salt spray generator should be a sodium chloride solution with a mass percentage concentration of 5% ± 1% and a pH value of 6.5~7.3 (measured at 25℃). The vibration test platform is set to generate a vibration frequency of 100Hz, and the horizontal / vertical acceleration is 0.2g / 0.13g (e.g., magnitude 8 earthquake). The stepper motor is set to generate a tension of 2.5kN and a pressure of 2.5kN. The copper rod is heated to 55℃, and the speed of the copper rod's up-and-down reciprocating movement is ±0.1m / s, and the displacement is ±0.1m.

[0138] Normal operating condition 2: The temperature and humidity of the chemical treatment chamber are set at -25℃ and the relative humidity is 100%. The salt spray generated by the salt spray generator should be a sodium chloride solution with a mass percentage concentration of 5% ± 1% and a pH value of 3.0~3.3 (measured at 25℃). The vibration test platform is set to generate a vibration frequency of 100Hz, and the horizontal / vertical acceleration is 0.2g / 0.13g (e.g., magnitude 8 earthquake). The stepper motor is set to generate a tension of 2.5kN and a pressure of 2.5kN. The copper rod is heated to 55℃, and the up-and-down reciprocating speed of the copper rod is ±0.1m / s, and the displacement is ±0.1m.

[0139] Normal operating condition 3: The temperature and humidity of the chemical treatment chamber are set at 40℃ and 100% relative humidity. The salt spray generated by the salt spray generator should be a sodium chloride solution with a mass percentage concentration of 5% ± 1% and a pH value of 6.5~7.3 (measured at 25℃). The vibration test platform is set to generate a vibration frequency of 100Hz, and the horizontal / vertical acceleration is 0.2g / 0.13g (e.g., magnitude 8 earthquake). The stepper motor is set to generate a tension of 2.5kN and a pressure of 2.5kN. The copper rod is heated to 120℃, and the up-and-down reciprocating speed of the copper rod is ±0.1m / s, and the displacement is ±0.1m.

[0140] Normal operating condition 4: The temperature and relative humidity of the chemical treatment chamber are set at 40℃ and 100% respectively. The salt spray generated by the salt spray generator should be a sodium chloride solution with a mass percentage concentration of 5% ± 1% and a pH value of 3.0~3.3 (measured at 25℃). The vibration test platform is set to generate a vibration frequency of 100Hz, and the horizontal / vertical acceleration is 0.2g / 0.13g (e.g., magnitude 8 earthquake). The stepper motor is set to generate a tension of 2.5kN and a pressure of 2.5kN. The copper rod is heated to 120℃, and the up-and-down reciprocating speed of the copper rod is ±0.1m / s, and the displacement is ±0.1m.

[0141] Extreme Condition 1: The temperature and humidity of the chemical treatment chamber are set at -30℃ and relative humidity at 100%. The salt spray generated by the salt spray generator should be a sodium chloride solution with a mass percentage concentration of 5% ± 1% and a pH value of 6.5~7.3 (measured at 25℃). The vibration test platform is set to generate a vibration frequency of 100Hz, and the horizontal / vertical acceleration is 0.4g / 0.26g (magnitude 9 earthquake). The stepper motor is set to generate a tension of 5kN and a pressure of 5kN. The copper rod is heated to 50℃, and the up-and-down reciprocating speed of the copper rod is ±0.2m / s, and the displacement is ±0.2m.

[0142] Extreme Condition 2: The temperature and humidity of the chemical treatment chamber are set at -30℃ and relative humidity at 100%. The salt spray generated by the salt spray generator should be a sodium chloride solution with a mass percentage concentration of 5% ± 1% and a pH value of 3.0 to 3.3 (measured at 25℃). The vibration test platform is set to generate a vibration frequency of 100Hz, and the horizontal / vertical acceleration is 0.4g / 0.26g (magnitude 9 earthquake). The stepper motor is set to generate a tension of 5kN and a pressure of 5kN. The copper rod is heated to 50℃, and the speed of the copper rod's up-and-down reciprocating movement is ±0.2m / s, and the displacement is ±0.2m.

[0143] Extreme Condition 3: The temperature and humidity of the chemical treatment chamber are set at 45℃ and 100% relative humidity. The salt spray generated by the salt spray generator should be a sodium chloride solution with a mass percentage concentration of 5% ± 1% and a pH value of 6.5~7.3 (measured at 25℃). The vibration test platform is set to generate a vibration frequency of 100Hz, and the horizontal / vertical acceleration is 0.4g / 0.26g (magnitude 9 earthquake). The stepper motor is set to generate a tension of 5kN and a pressure of 5kN. The copper rod is heated to 125℃, and the up-and-down reciprocating speed of the copper rod is ±0.2m / s, and the displacement is ±0.2m.

[0144] Extreme Condition 4: The temperature and humidity of the chemical treatment chamber are set at 45℃ and 100% relative humidity. The salt spray generated by the salt spray generator should be a sodium chloride solution with a mass percentage concentration of 5% ± 1% and a pH value of 3.0~3.3 (measured at 25℃). The vibration test platform is set to generate a vibration frequency of 100Hz, and the horizontal / vertical acceleration is 0.4g / 0.26g (magnitude 9 earthquake). The stepper motor is set to generate a tension of 5kN and a pressure of 5kN. The copper rod is heated to 125℃, and the up-and-down reciprocating speed of the copper rod is ±0.2m / s, and the displacement is ±0.2m.

[0145] It should be noted that the aforementioned internal and external multi-factor effects can be applied sequentially as described above, simultaneously, or in a different order, as long as it is ensured that the application of each factor does not affect the normal operation of other factors or equipment.

[0146] The acquisition unit 200 is used to sequentially control the inflation device to inflate or extract gas into the sealed structure under the experimental conditions, acquire the current gas pressure value of the inflation device to obtain a first gas pressure value, and acquire the current gas pressure value of the inflation device to obtain a second gas pressure value after the inflation device stops inflating or extracting gas for a predetermined duration.

[0147] Specifically, firstly, the experimental equipment is controlled to adjust the environment of the sealing structure to normal operating condition 1. Under this condition, the inflation device is controlled to inject or extract gas into the sealed structure. Then, by detecting the pressure change in the sealed structure, it is determined whether there is gas exchange between the sealing structure and the outside environment, thereby judging the sealing performance of the sealing structure. Next, the experimental equipment is controlled to sequentially adjust the environment of the sealing structure to normal operating conditions 2-4 and extreme operating conditions 1-4, and the sealing performance of the sealing structure is tested under each of these conditions to obtain the sealing performance of the sealing structure under different environments.

[0148] The judgment unit 300 is used to determine the sealing performance of the sealing structure based on the first air pressure value and the second air pressure value.

[0149] Specifically, the first and second air pressure values ​​can reflect the air pressure changes in the sealed structure, whether there is gas exchange between the sealed structure and the outside world, and thus determine the sealing performance of the sealed structure.

[0150] In this embodiment, the setting unit is used to set multiple experimental conditions. These experimental conditions are used to simulate the internal and / or external factors of the sealing structure during transformer operation. The internal factors include the temperature of the conductive rod, the pressure, tension, and friction of the conductive rod on the sealing structure, and the external factors include the temperature, humidity, and salt spray of the environment in which the sealing structure is located during transformer operation, as well as the vibration generated by the transformer operation. The acquisition unit is used to sequentially control the gas filling device to fill or extract gas into the sealed structure under the above experimental conditions, acquire the current gas pressure value of the gas filling device to obtain a first gas pressure value, and acquire the current gas pressure value of the gas filling device after the gas filling or extraction device has stopped filling or extracting gas for a predetermined duration to obtain a second gas pressure value. The judgment unit is used to determine the sealing performance of the sealing structure based on the first gas pressure value and the second gas pressure value. This method simulates the temperature and humidity conditions of the external environment during transformer operation using the aforementioned constant temperature and humidity aging chamber, simulates the vibration generated during transformer operation using the aforementioned vibration test platform, simulates the displacement of the conductive rod during transformer operation using the aforementioned stepper motor-driven copper rod, simulates the heating of the conductive rod during transformer operation using the aforementioned heating device, and simulates the salt spray conditions of the external environment during transformer operation using the aforementioned salt spray generator. This method simulates the coupling effect of complex internal and external factors during transformer operation, solving the problem of the lack of a method in the prior art for testing the sealing performance of the bushing head sealing structure under the coupling effect of multiple internal and external factors of a transformer.

[0151] In order to obtain the air pressure change in the cavity of the aforementioned sealing structure, in one optional embodiment, the obtaining unit includes:

[0152] The first acquisition subunit is used to control the inflation device to inject gas at a first predetermined pressure into the sealing structure, acquire the current gas pressure value of the inflation device, and obtain the first gas pressure value.

[0153] Specifically, in one embodiment of this application, the inflation device is controlled to fill the central cavity of the sealing structure with gas at 0.3 MPa. The gas can be high-purity nitrogen or SF6 gas. The pressure sensor built into the inflation device records the current gas pressure value K1 of the central cavity, which is the first gas pressure value.

[0154] The second acquisition subunit is used to acquire the first moment corresponding to the first air pressure value, wherein the first moment is the moment when inflation stops.

[0155] Specifically, the air pressure value K1 in the central cavity after inflation is recorded by the pressure sensor built into the inflation device, and the time t1 at this time is also recorded.

[0156] The third acquisition subunit is used to acquire the current air pressure value of the inflation device at the second time, and obtain the second air pressure value. The second time is the time after the first time.

[0157] Specifically, after recording time t1, the current air pressure value K2 of the central cavity is recorded by the pressure sensor built into the inflation device at a certain time. The aforementioned certain time is the second time t2, which can be any time after the first time.

[0158] In order to obtain the air pressure change in the cavity of the aforementioned sealing structure, in one optional embodiment, the obtaining unit includes:

[0159] The first control subunit is used to control the inflation device to extract gas from the sealing structure until the air pressure value of the inflation device is a first predetermined air pressure value, so that the first air pressure value is equal to the first predetermined air pressure value.

[0160] Specifically, in another embodiment of this application, the inflation device is controlled to extract gas from the central cavity of the sealing structure until the pressure value of the pressure sensor is 5 Pa, at which point the vacuuming stops, and the current pressure value A of the central cavity, i.e., the first predetermined pressure value of 5 Pa, is recorded by the pressure sensor built into the inflation device.

[0161] The fourth acquisition subunit is used to acquire the current air pressure value of the inflation device and obtain the second air pressure value after the timing period after the air pressure value of the inflation device reaches the first predetermined air pressure value reaches the first predetermined time.

[0162] Specifically, in one embodiment of this application, after obtaining the first air pressure value A, after 0.5 hours, the current air pressure value B of the central cavity, i.e. the second air pressure value, is recorded by the pressure sensor built into the inflation device.

[0163] In order to obtain the air pressure change in the cavity of the aforementioned sealing structure, in one optional embodiment, the obtaining unit includes:

[0164] The second control subunit is used to control the inflation device to extract gas from the sealing structure until the air pressure value of the inflation device is a second predetermined air pressure value.

[0165] Specifically, in another embodiment of this application, the inflation device is controlled to extract gas from the central cavity of the sealing structure until the pressure value of the pressure sensor is 133 Pa, that is, the second predetermined pressure value is 133 Pa.

[0166] The third control subunit is used to stop extracting gas from the sealing structure when the gas pressure value of the inflation device reaches the second predetermined gas pressure value and the duration of extracting gas from the sealing structure reaches the second predetermined duration.

[0167] Specifically, after the pressure sensor measures the air pressure in the central cavity to be the second predetermined air pressure value, the inflation device is controlled to continue extracting gas from the central cavity for 0.5 hours, and then the extraction of gas from the central cavity is stopped.

[0168] The fifth acquisition subunit is used to acquire the current air pressure value of the inflation device and obtain the first air pressure value when the duration of the gas extraction from the sealing structure reaches a second predetermined time.

[0169] Specifically, after 0.5 hours of evacuation is stopped, the current air pressure value A of the central cavity is recorded by the pressure sensor built into the inflation device, which is the first air pressure value.

[0170] The sixth acquisition subunit is used to acquire the current air pressure value of the inflation device after a third predetermined time period following the acquisition of the first air pressure value, and to obtain the second air pressure value.

[0171] Specifically, after obtaining the first air pressure value of 5h, the third predetermined time is 5h. The current air pressure value B of the central cavity is recorded by the pressure sensor built into the inflation device, which is the second air pressure value.

[0172] To determine the sealing performance of the aforementioned sealing structure under positive pressure conditions, in one optional embodiment, the determination unit includes:

[0173] The seventh acquisition subunit is used to acquire the volume of the cavity gas in the above-mentioned sealed structure;

[0174] Specifically, the volume of the central cavity of the aforementioned sealing structure is fixed. After the gas is filled into the central cavity, its volume is the volume of the central cavity. Let the volume of the gas in the cavity of the aforementioned sealed structure be V.

[0175] The first calculation subunit is used to calculate the first difference and the second difference, wherein the first difference is the difference between the first air pressure value and the second air pressure value, and the second difference is the difference between the second time and the first time.

[0176] Specifically, the difference between the first and second air pressure values ​​can reflect the pressure change in the central cavity. This pressure change is caused by gas exchange between the sealing structure and the outside environment, thus also reflecting the sealing performance of the sealing device. It should be noted that the sealing structure cannot completely isolate air; however, by calculating the time it takes for the pressure change to occur, the rate of pressure change in the sealing structure can be determined, thereby reflecting the rate of gas leakage from the sealing structure.

[0177] The second calculation subunit is used to calculate the annual total leakage rate based on the cavity gas volume, the first difference and the second difference. The annual total leakage rate is used to characterize the gas leakage in the sealing structure.

[0178] Specifically, the annual total leakage rate can be calculated using the formula L = V(K2-K1) / (t2-t1).

[0179] The first determining subunit is used to determine that the sealing structure has good sealing performance under positive pressure conditions when the leakage rate is less than a predetermined value. The positive pressure conditions are conditions where the pressure inside the sealing structure is greater than the external pressure.

[0180] Specifically, if the calculated total annual leakage rate is less than or equal to 0.5% / year of the gas content in the central cavity of the above-mentioned sealing structure, then the above-mentioned sealing structure is considered to have good sealing performance under positive pressure conditions.

[0181] To determine the sealing performance of the aforementioned sealing structure under negative pressure conditions, in one optional embodiment, the determination unit includes:

[0182] The third calculation subunit is used to calculate the third difference, which is the difference between the second air pressure value and the first air pressure value.

[0183] Specifically, the difference between the first air pressure value and the second air pressure value can reflect the air pressure change in the central cavity. The air pressure change in the central cavity is caused by the gas exchange between the sealing structure and the outside world, and thus can also reflect the sealing performance of the sealing device.

[0184] The second determining subunit is used to determine that the sealing structure has good sealing performance under negative pressure conditions when the third difference is less than or equal to the first predetermined air pressure value. The negative pressure condition is the condition where the pressure inside the sealing structure is less than the external pressure.

[0185] Specifically, in one embodiment of this application, when the third difference is less than or equal to the first predetermined air pressure value, i.e., BA≤5Pa, the sealing structure is considered to have good sealing performance under negative pressure conditions.

[0186] To determine the sealing performance of the aforementioned sealing structure under negative pressure conditions, in one optional embodiment, the determination unit includes:

[0187] The fourth calculation subunit is used to calculate the fourth difference, which is the difference between the second air pressure value and the first air pressure value.

[0188] Specifically, the difference between the first air pressure value and the second air pressure value can reflect the air pressure change in the central cavity. The air pressure change in the central cavity is caused by the gas exchange between the sealing structure and the outside world, and thus can also reflect the sealing performance of the sealing device.

[0189] The third determining subunit is used to determine that the sealing structure has good sealing performance under negative pressure conditions when the fourth difference is less than or equal to the second predetermined air pressure value.

[0190] Specifically, in one embodiment of this application, when the fourth difference is less than or equal to the first predetermined air pressure value, i.e., BA≤133Pa, the sealing structure is considered to have good sealing performance under negative pressure conditions.

[0191] To ultimately determine the sealing performance of the aforementioned sealing structure, in one optional embodiment, the determination unit includes:

[0192] The fourth determining subunit is used to determine that the sealing structure is good when it is determined that the sealing structure is good under positive pressure and under negative pressure. The positive pressure condition is when the pressure inside the sealing structure is greater than the external pressure, and the negative pressure condition is when the pressure inside the sealing structure is less than the external pressure.

[0193] Specifically, based on the sealing test results under the aforementioned positive pressure and negative pressure conditions, if it is determined that the sealing structure has good sealing performance under both positive and negative pressure conditions, then the sealing performance of the aforementioned sealing structure is determined to be good.

[0194] The fifth determining subunit is used to determine the poor sealing performance of the sealing structure when it is determined that the sealing structure is poor under positive pressure or poor under negative pressure.

[0195] Specifically, based on the sealing test results under the above positive pressure condition and the above negative pressure condition, if it is determined that the sealing structure has poor sealing performance under either the positive pressure condition or the negative pressure condition, then the sealing structure is determined to have poor sealing performance.

[0196] The control device of the aforementioned sealing experimental equipment includes a processor and a memory. The setting unit, acquisition unit, and judgment unit are all stored as program units in the memory, and the processor executes these program units to achieve the corresponding functions. All of the above modules are located in the same processor; alternatively, the modules may be located in different processors in any combination.

[0197] The processor contains a kernel, which retrieves the corresponding program unit from memory. One or more kernels can be configured, and the sealing performance of the bushing head under the coupling effects of various internal and external factors of the transformer can be tested by adjusting the kernel parameters.

[0198] The memory may include non-permanent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0199] This invention provides a computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device containing the computer-readable storage medium to perform the control method of the sealing experimental device.

[0200] This invention provides a processor for running a program, wherein the program executes the control method for the sealing experimental device.

[0201] This invention provides a sealing test system, which includes the sealing test equipment, a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it performs at least the following steps:

[0202] Step S201: Set multiple experimental conditions. The experimental conditions are used to simulate the internal and / or external factors of the sealing structure during transformer operation. The internal factors include the temperature of the conductive rod, the pressure, tension and friction of the conductive rod on the sealing structure, and the external factors include the temperature, humidity and salt spray of the environment in which the sealing structure is located during transformer operation, as well as the vibration generated by transformer operation.

[0203] Step S202: Under the above experimental conditions, control the inflation device to inflate or extract gas into the sealed structure, and obtain the current gas pressure value of the inflation device to obtain the first gas pressure value. After the inflation device stops inflating or extracting gas for a predetermined duration, obtain the current gas pressure value of the inflation device to obtain the second gas pressure value.

[0204] Step S203: Determine the sealing performance of the sealing structure based on the first air pressure value and the second air pressure value.

[0205] In addition, such as Figure 6 As shown, the above-mentioned sealing test system also includes:

[0206] The signal amplification and filtering module is communicatively connected to the tension / compression sensor, displacement sensor, first temperature sensor, pressure sensor, pH sensor, second temperature sensor, humidity sensor, and acceleration sensor, respectively. The signal amplification and filtering module is used to amplify and filter the analog signals monitored by the tension / compression sensor, displacement sensor, first temperature sensor, pressure sensor, pH sensor, second temperature sensor, humidity sensor, and acceleration sensor to obtain the target analog signal.

[0207] The data acquisition module is communicatively connected to the signal amplification and filtering module and is used to acquire the target analog signal.

[0208] An A / D conversion module is communicatively connected to the data acquisition module. The A / D conversion module is used to convert the target analog signal acquired by the data acquisition module into a digital signal.

[0209] The host display analysis module is connected to the A / D conversion module and the display screen respectively. The host display analysis module is used to analyze the sealing performance of the sealing structure based on the digital signal, obtain the analysis result, and display the digital quantity corresponding to the digital signal and the analysis result on the display screen.

[0210] The data transmission module is communicatively connected to both the A / D conversion module and the host display and analysis module, and is used to transmit the digital signal to the host display and analysis module.

[0211] The control module is communicatively connected to the signal amplification and filtering module, the data acquisition module, the A / D conversion module, the host display and analysis module, and the data transmission module, respectively. The control module is used to control the operation of the signal amplification and filtering module, the data acquisition module, the A / D conversion module, the host display and analysis module, and the data transmission module.

[0212] This application also provides a computer program product, which, when executed on a data processing device, is suitable for executing an initialization program having at least the following method steps:

[0213] Step S201: Set multiple experimental conditions. The experimental conditions are used to simulate the internal and / or external factors of the sealing structure during transformer operation. The internal factors include the temperature of the conductive rod, the pressure, tension and friction of the conductive rod on the sealing structure, and the external factors include the temperature, humidity and salt spray of the environment in which the sealing structure is located during transformer operation, as well as the vibration generated by transformer operation.

[0214] Step S202: Under the above experimental conditions, control the inflation device to inflate or extract gas into the sealed structure, and obtain the current gas pressure value of the inflation device to obtain the first gas pressure value. After the inflation device stops inflating or extracting gas for a predetermined duration, obtain the current gas pressure value of the inflation device to obtain the second gas pressure value.

[0215] Step S203: Determine the sealing performance of the sealing structure based on the first air pressure value and the second air pressure value.

[0216] It is obvious to those skilled in the art that the modules or steps of the present invention described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those described herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0217] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0218] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0219] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0220] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0221] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0222] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0223] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0224] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0225] 1) The control method of the sealing test equipment of this application firstly sets multiple test conditions to simulate the internal and / or external factors of the sealing structure during transformer operation. The internal factors include the temperature of the conductive rod, the pressure, tension, and friction of the conductive rod on the sealing structure, and the external factors include the temperature, humidity, and salt spray of the environment in which the sealing structure is located during transformer operation, as well as the vibration generated by the transformer operation. Then, under the above test conditions, the gas filling device is controlled to fill or extract gas into the sealed structure, and the current gas pressure value of the gas filling device is obtained to obtain a first gas pressure value. After the duration of the gas filling or extraction device stopping reaches a predetermined time, the current gas pressure value of the gas filling device is obtained to obtain a second gas pressure value. Finally, the sealing performance of the sealing structure is determined based on the first gas pressure value and the second gas pressure value. This method simulates the temperature and humidity conditions of the external environment during transformer operation using the aforementioned constant temperature and humidity aging chamber, simulates the vibration generated during transformer operation using the aforementioned vibration test platform, simulates the displacement of the conductive rod during transformer operation using the aforementioned stepper motor-driven copper rod, simulates the heating of the conductive rod during transformer operation using the aforementioned heating device, and simulates the salt spray conditions of the external environment during transformer operation using the aforementioned salt spray generator. This method simulates the coupling effect of complex internal and external factors during transformer operation, solving the problem of the lack of a method in the prior art for testing the sealing performance of the bushing head sealing structure under the coupling effect of multiple internal and external factors of a transformer.

[0226] 2) The control device of the sealing test equipment of this application includes a setting unit for setting multiple test conditions, which are used to simulate the internal and / or external factors of the sealing structure during transformer operation. The internal factors include the temperature of the conductive rod, the pressure, tension, and friction of the conductive rod on the sealing structure, and the external factors include the temperature, humidity, and salt spray of the environment in which the sealing structure is located during transformer operation, as well as the vibration generated by the transformer operation. The acquisition unit is used to sequentially control the gas filling device to fill or extract gas into the sealed structure under the above test conditions, acquire the current gas pressure value of the gas filling device to obtain a first gas pressure value, and acquire the current gas pressure value of the gas filling device after the duration of the gas filling or gas extraction stops reaches a predetermined time to obtain a second gas pressure value. The judgment unit is used to determine the sealing performance of the sealing structure based on the first gas pressure value and the second gas pressure value. This method simulates the temperature and humidity conditions of the external environment during transformer operation using the aforementioned constant temperature and humidity aging chamber, simulates the vibration generated during transformer operation using the aforementioned vibration test platform, simulates the displacement of the conductive rod during transformer operation using the aforementioned stepper motor-driven copper rod, simulates the heating of the conductive rod during transformer operation using the aforementioned heating device, and simulates the salt spray conditions of the external environment during transformer operation using the aforementioned salt spray generator. This method simulates the coupling effect of complex internal and external factors during transformer operation, solving the problem of the lack of a method in the prior art for testing the sealing performance of the bushing head sealing structure under the coupling effect of multiple internal and external factors of a transformer.

[0227] The above description is merely a preferred embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A sealing experimental device, characterized in that, include: A vibration testing platform, used to simulate the vibrations generated during transformer operation; A constant temperature and humidity aging chamber is placed on the vibration test platform. The constant temperature and humidity aging chamber is used to simulate the transformer. The temperature and humidity conditions of the external environment during the operation of the instrument; A sealing structure is fixed in the constant temperature and humidity aging chamber. The sealing structure is used to simulate the sealing structure of the bushing head of the transformer. The bushing head is the end of the bushing of the transformer located outside the transformer housing. A copper rod, a portion of which is located within the sealing structure, the copper rod serving to simulate the conductive rod of the transformer, a portion of which is located within the bushing; A stepper motor is connected to the copper rod, and the stepper motor is used to make the copper rod axially displaced and to apply axial or radial force to the copper rod; A heating device is connected to the copper rod. The heating device is used to heat the copper rod to simulate the heating of the conductive rod when it is energized during the operation of the transformer. A salt spray generator is installed on the inner wall of the constant temperature and humidity aging chamber. The salt spray generator is used to simulate the salt spray conditions of the external environment during the operation of the transformer. The salt spray generator includes a pH sensor. An inflation device is connected to the sealing structure via a pipeline, and the inflation device is used to inflate or depress gas into the sealing structure. A tension / compression sensor is connected to the copper rod, and the tension / compression sensor is used to measure the force applied to the copper rod by the stepper motor; A displacement sensor is connected to the copper rod, and the displacement sensor is used to monitor the axial displacement of the copper rod; A first temperature sensor is connected to the copper rod, and the first temperature sensor is used to measure the temperature of the copper rod; The sealing structure includes an upper metal flange structure, a middle cavity, and a lower support base. The upper metal flange structure includes a sealing groove. The support base is fixed in the constant temperature and humidity aging chamber. The sealing test equipment also includes: a sleeve located in the middle cavity, which is used to fix the copper rod so that the copper rod can move axially when the stepper motor drives the copper rod; and a sealing ring placed in the sealing groove to ensure the sealing performance at the connection between the copper rod and the sealing structure.

2. A control method for the sealing experimental device according to claim 1, characterized in that, The control method includes: setting multiple experimental conditions, which are used to simulate the internal and / or external factors of the sealing structure during transformer operation. The internal factors include the temperature of the conductive rod, the pressure, tension and friction of the conductive rod on the sealing structure, and the external factors include the temperature, humidity and salt spray of the environment in which the sealing structure is located during transformer operation, as well as the vibration generated by the transformer operation. Under the experimental conditions, the inflation device is controlled to inflate or depress gas into the sealing structure, and the current gas pressure value of the inflation device is obtained to obtain the first gas pressure value. After the inflation device stops inflating or depressing for a predetermined duration, the current gas pressure value of the inflation device is obtained to obtain the second gas pressure value. The sealing performance of the sealing structure is determined based on the first air pressure value and the second air pressure value.

3. The method according to claim 2, characterized in that, Under the experimental conditions, the inflation device is controlled to inflate or depress gas into the sealed structure, and the current gas pressure value of the inflation device is obtained to obtain a first gas pressure value. After the inflation device stops inflating or depressing for a first predetermined duration, the current gas pressure value of the inflation device is obtained to obtain a second gas pressure value, including: The inflation device is controlled to inflate the sealing structure with gas at a first predetermined pressure, and the current pressure value of the inflation device is obtained to obtain the first pressure value. Obtain the first moment corresponding to the first air pressure value, where the first moment is the moment when inflation stops; The current air pressure value of the inflation device is obtained at the second time, and the second time is the time after the first time.

4. The method according to claim 2, characterized in that, Under the experimental conditions, the inflation device is controlled to inflate or depress gas into the sealed structure, and the current gas pressure value of the inflation device is obtained to obtain a first gas pressure value. After the inflation device stops inflating or depressing for a first predetermined duration, the current gas pressure value of the inflation device is obtained to obtain a second gas pressure value. The method also includes: The inflation device is controlled to extract gas from the sealed structure until the air pressure of the inflation device is a first predetermined air pressure value, so that the first air pressure value is equal to the first predetermined air pressure value. After the timing period following the inflation device reaching the first predetermined inflation value reaches the first predetermined inflation value, the current inflation value of the inflation device is obtained, and the second inflation value is obtained.

5. The method according to claim 2, characterized in that, Under the experimental conditions, the inflation device is controlled to inflate or depress gas into the sealed structure, and the current gas pressure value of the inflation device is obtained to obtain a first gas pressure value. After the inflation device stops inflating or depressing for a first predetermined duration, the current gas pressure value of the inflation device is obtained to obtain a second gas pressure value. The method also includes: The inflation device is controlled to extract gas from the sealed structure until the air pressure of the inflation device is a second predetermined air pressure value. When the air pressure value of the inflation device reaches the second predetermined air pressure value and the duration of continuing to extract gas from the sealing structure reaches the second predetermined duration, the extraction of gas from the sealing structure is stopped; when the duration of stopping the extraction of gas from the sealing structure reaches the second predetermined duration, the current air pressure value of the inflation device is obtained, and the first air pressure value is obtained. After a third predetermined time has elapsed since the first air pressure value was obtained, the current air pressure value of the inflation device is obtained, and the second air pressure value is obtained.

6. The method according to claim 3, characterized in that, Determining the sealing performance of the sealing structure based on the first air pressure value and the second air pressure value includes: obtaining the cavity gas volume of the sealing structure; Calculate the first difference and the second difference, where the first difference is the difference between the first air pressure value and the second air pressure value, and the second difference is the difference between the second time and the first time. The annual total leakage rate is calculated based on the cavity gas volume, the first difference, and the second difference. The annual total leakage rate is used to characterize the gas leakage situation in the sealing structure. If the leakage rate is less than a predetermined value, it is determined that the sealing structure has good sealing performance under positive pressure conditions. The positive pressure conditions are conditions where the pressure inside the sealing structure is greater than the external pressure.

7. The method according to claim 4, characterized in that, Determining the sealing performance of the sealing structure based on the first air pressure value and the second air pressure value includes: calculating a third difference, wherein the third difference is the difference between the second air pressure value and the first air pressure value; If the third difference is less than or equal to the first predetermined air pressure value, it is determined that the sealing structure has good sealing performance under negative pressure conditions, where the negative pressure conditions are conditions where the pressure inside the sealing structure is less than the external pressure.

8. The method according to claim 5, characterized in that, Determining the sealing performance of the sealing structure based on the first air pressure value and the second air pressure value includes: Calculate the fourth difference, which is the difference between the second air pressure value and the first air pressure value; If the fourth difference is less than or equal to the second predetermined air pressure value, it is determined that the sealing structure has good sealing performance under negative pressure conditions.

9. The method according to claim 2, characterized in that, Determining the sealing performance of the sealing structure based on the first air pressure value and the second air pressure value includes: If it is determined that the sealing structure has good sealing performance under both positive and negative pressure conditions, then the sealing structure is deemed to have good sealing performance. Positive pressure condition refers to a condition where the internal pressure of the sealing structure is greater than the external pressure, and negative pressure condition refers to a condition where the internal pressure of the sealing structure is less than the external pressure. If it is determined that the sealing structure has poor sealing performance under either positive or negative pressure conditions, then the sealing structure is deemed to have poor sealing performance.

10. A control device for the sealing test equipment according to claim 1, characterized in that, The control device includes: a setting unit for setting multiple experimental conditions, which are used to simulate the internal and / or external factors of the sealing structure during transformer operation. The internal factors include the temperature of the guide rod, the pressure, tension and friction of the guide rod on the sealing structure, and the external factors include the temperature, humidity and salt spray of the environment in which the sealing structure is located during transformer operation, as well as the vibration generated by the transformer operation. The acquisition unit is used to sequentially control the inflation device to inflate or depress gas into the sealing structure under the experimental conditions, acquire the current gas pressure value of the inflation device to obtain a first gas pressure value, and acquire the current gas pressure value of the inflation device after the inflation device stops inflating or depressing for a predetermined duration to obtain a second gas pressure value; the judgment unit is used to determine the sealing performance of the sealing structure based on the first gas pressure value and the second gas pressure value.

11. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the device on which the computer-readable storage medium is located to perform the method according to any one of claims 2 to 9.

12. A sealed experimental system, characterized in that, The sealing test system includes the sealing test apparatus of claim 1, and the test system further includes one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs include methods for performing any one of claims 2 to 9.

13. The system according to claim 12, characterized in that, The experimental system also includes: The signal amplification and filtering module is communicatively connected to the tension / compression sensor, displacement sensor, first temperature sensor, pressure sensor, pH sensor, second temperature sensor, humidity sensor, and acceleration sensor, respectively. The signal amplification and filtering module is used to amplify and filter the analog signals monitored by the tension / compression sensor, displacement sensor, first temperature sensor, pressure sensor, pH sensor, second temperature sensor, humidity sensor, and acceleration sensor to obtain the target analog signal. The data acquisition module is communicatively connected to the signal amplification and filtering module and is used to acquire the target analog signal. An A / D conversion module is communicatively connected to the data acquisition module. The A / D conversion module is used to convert the target analog signal acquired by the data acquisition module into a digital signal. The host display analysis module is connected to the A / D conversion module and the display screen respectively. The host display analysis module is used to analyze the sealing performance of the sealing structure based on the digital signal, obtain the analysis result, and display the digital quantity corresponding to the digital signal and the analysis result on the display screen. The data transmission module is communicatively connected to both the A / D conversion module and the host display and analysis module, and is used to transmit the digital signal to the host display and analysis module. The control module is communicatively connected to the signal amplification and filtering module, the data acquisition module, the A / D conversion module, the host display and analysis module, and the data transmission module, respectively. The control module is used to control the operation of the signal amplification and filtering module, the data acquisition module, the A / D conversion module, the host display and analysis module, and the data transmission module.

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