Vacuumizing device, transformer vacuum oiling equipment and vacuumizing method

Abstract

The application provides a vacuumizing device, a transformer vacuum oil injection equipment and a vacuumizing method. The vacuumizing device comprises: a first vacuumizing pump for extracting gas in a cavity of a transformer; a micro-water measuring device arranged at a first gas inlet end of the first vacuumizing pump, the micro-water measuring device being used for measuring water content of the gas from the cavity of the transformer; a condensed water measuring device arranged at a gas outlet end of the first vacuumizing pump, the condensed water measuring device being used for measuring condensed water quantity extracted by the first vacuumizing pump; and a controller comprising: a first control interface electrically connected with the first vacuumizing pump, the first control interface being used for transmitting an opening signal or a closing signal to the first vacuumizing pump; a second control interface used for receiving water content information sent by the micro-water measuring device and forwarding the water content information to an interactive end; and a third control interface used for receiving condensed water quantity information sent by the condensed water measuring device and forwarding the condensed water quantity information to the interactive end. The vacuumizing device can realize efficient vacuumizing operation.

Description

Technical Field

[0001] This invention relates to the field of transformer manufacturing technology, and in particular to a vacuuming device, a transformer vacuum oil injection equipment, and a vacuuming method. Background Technology

[0002] Currently, after the transformer is assembled in the drying furnace, it is necessary to remove moisture from the transformer's internal cavity using a vacuum method, also known as vacuum dehydration. When using existing vacuum equipment for vacuuming operations, it is often necessary to manually determine the vacuuming strategy based on experience.

[0003] When dealing with multiple transformer models, a lack of experience can easily lead to insufficient or excessive vacuuming. Insufficient vacuuming results in rework, delays in the production cycle, and reduced vacuuming efficiency; while excessive vacuuming wastes time and also reduces efficiency. Furthermore, various factors such as transformer insulation requirements, moisture absorption during final assembly, and temperature all affect vacuuming operations. Experience is often insufficient, making it easy to experience either insufficient or excessive vacuuming, thus reducing efficiency.

[0004] The efficiency of vacuuming operations using existing vacuuming devices is low. Summary of the Invention

[0005] This invention provides a vacuum pumping device, a transformer vacuum oil injection equipment, and a vacuum pumping method to solve the problem of low efficiency when using existing vacuum pumping devices for vacuum pumping operations.

[0006] To solve the above-mentioned technical problems, the present invention is implemented as follows:

[0007] In a first aspect, embodiments of the present invention provide a vacuum pumping device, comprising:

[0008] The first vacuum pump is used to extract gas from the transformer's internal cavity.

[0009] A micro-moisture measuring device is installed at the first air inlet of the first vacuum pump, and the first air inlet is connected to the inner cavity of the transformer. The micro-moisture measuring device is used to measure the moisture content of the gas from the inner cavity of the transformer.

[0010] A condensate measuring device is installed at the outlet of the first vacuum pump to measure the amount of condensate pumped out by the first vacuum pump.

[0011] The controller includes:

[0012] The first control interface is electrically connected to the first vacuum pump and is used to transmit an on or off signal to the first vacuum pump.

[0013] The second control interface is used to receive moisture content information sent by the micro-moisture measuring device and forward it to the interactive terminal;

[0014] The third control interface is used to receive the condensate volume information sent by the condensate measuring device and forward it to the interactive terminal.

[0015] Optionally,

[0016] A vacuum transition tank, wherein the air inlet of the vacuum transition tank is connected to the inner cavity of the transformer via a pipe, and the air outlet of the vacuum transition tank is connected to the first air inlet via a pipe.

[0017] Optionally,

[0018] The micro-water measuring device includes:

[0019] A micro-moisture measurement probe is installed at the air inlet of the vacuum transition tank, or on the pipe between the air inlet of the vacuum transition tank and the inner cavity of the transformer, for acquiring raw moisture data;

[0020] The micro-moisture measurement host is electrically connected to the measurement probe via a signal line. It is used to receive the raw moisture data and convert the raw moisture data into moisture content information; it is also used to send the moisture content information to the second control interface.

[0021] Optionally,

[0022] The micro-water measuring device includes:

[0023] A micro-moisture measurement probe is installed at the first air inlet end to acquire raw moisture data;

[0024] The micro-moisture measurement host is electrically connected to the measurement probe via a signal line. It is used to receive the raw moisture data and convert the raw moisture data into moisture content information; it is also used to send the moisture content information to the second control interface.

[0025] Optionally,

[0026] The micro-water measurement probe has at least two probes, and both probes are electrically connected to the micro-water measurement host via signal lines.

[0027] Optionally,

[0028] The second control interface is wirelessly connected to the micro-water measurement device.

[0029] Optionally,

[0030] The third control interface is wirelessly connected to the condensate measuring device.

[0031] Optionally,

[0032] The controller further includes:

[0033] Information storage unit, used to store received information;

[0034] The second control interface is also used to forward the moisture content information to the information storage unit;

[0035] The third control interface is also used to forward the condensate water volume information to the information storage unit.

[0036] Optionally,

[0037] The controller further includes:

[0038] The fourth control interface is connected to the cloud platform and is used to receive remote operation commands sent by the cloud platform. The remote operation commands are used to control the first control interface to transmit an on or off signal to the first vacuum pump.

[0039] Optionally,

[0040] The first vacuum pump is a Roots vacuum pump;

[0041] The vacuum pumping device also includes:

[0042] The second vacuum pump, whose inlet end is connected to the outlet end of the condensate measuring device, is used to extract gas from the transformer cavity.

[0043] The first control interface is electrically connected to the second vacuum pump and is used to transmit an on or off signal to the second vacuum pump.

[0044] Secondly, embodiments of the present invention provide a transformer vacuum oil injection device, comprising: a vacuum pumping device as described in any one of the first aspects.

[0045] Thirdly, embodiments of the present invention provide a vacuuming method applied to an interactive terminal, comprising:

[0046] It receives information on moisture content and condensate volume.

[0047] Based on the moisture content information and the condensate content information, a vacuuming strategy matching the first transformer currently being evacuated is determined. The vacuuming strategy includes: water output rate, condensate change rate, vacuum degree, and vacuuming time.

[0048] When vacuuming again, if the target transformer to be vacuumed is the same model as the first transformer, the vacuuming device is controlled to vacuum the target transformer according to the vacuuming strategy.

[0049] In this embodiment of the invention, the vacuuming device is equipped with a micro-moisture measuring device for measuring microscopic moisture content and a condensate measuring device for measuring macroscopic moisture content. The vacuuming device obtains moisture data through a dual-channel measurement scheme combining microscopic and macroscopic measurements. The moisture data obtained from microscopic measurements (i.e., moisture content information) and the moisture data obtained from macroscopic measurements (i.e., condensate volume information) corroborate each other, enabling the vacuuming device to achieve highly accurate moisture measurement. Furthermore, by placing the micro-moisture measuring device at the first air inlet of the first vacuum pump and the condensate measuring device at the air outlet of the first vacuum pump, high accuracy is ensured for both microscopic and macroscopic moisture measurements. The vacuuming device in this embodiment of the invention includes a controller. The second and third control interfaces of the controller forward the moisture data obtained from microscopic measurements (i.e., moisture content information) and the moisture data obtained from macroscopic measurements (i.e., condensate volume information) to an interactive terminal, allowing the user to assess the vacuuming level and determine the vacuuming strategy. The first control interface in the controller is used to transmit an on / off signal to the first vacuum pump. The user can implement a vacuuming strategy by controlling the on / off operation of the vacuuming process through the controller. The vacuuming device of this embodiment can measure and provide highly accurate moisture information to the user. The user can implement a vacuuming strategy by controlling the on / off operation of the vacuuming process through the controller. Using the vacuuming device of this embodiment can avoid insufficient or excessive vacuuming, achieving highly efficient vacuuming operations. Attached Figure Description

[0050] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0051] Figure 1 This is one of the principle block diagrams of the vacuum pumping device according to an embodiment of the present invention;

[0052] Figure 2 This is a schematic diagram of the vacuum pumping device;

[0053] Figure 3 This is the second principle block diagram of the vacuum pumping device according to an embodiment of the present invention;

[0054] Figure 4 This is a schematic flowchart of the vacuuming method according to an embodiment of the present invention;

[0055] in:

[0056] 101. First vacuum pump; 102. Micro-water measuring device; 103. Micro-water measuring device; 104. Controller; 1041. First control interface; 1042. Second control interface; 1043. Third control interface; 105. Second vacuum pump;

[0057] 2. Vacuum unit; 3. Vacuum unit control cabinet; 4. Vacuum unit outlet; 5. Power cable; 6. Signal cable; 7. Micro-water measurement host; 8. Signal cable; 9. Signal cable; 10. Vacuum transition tank; 11. Inlet pipe; 12. Data acquisition probe; 13. Data acquisition probe; 14. Pipeline; 15. Pipeline; 16. Condensate measurement control cabinet; 17. Signal cable; 18. Power cable. Detailed Implementation

[0058] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0059] This invention provides a vacuum pumping device, see [link to relevant documentation]. Figure 1 As shown, Figure 1 This is one of the principle block diagrams of a vacuum pumping device according to an embodiment of the present invention. The vacuum pumping device 100 includes:

[0060] The first vacuum pump 101 is used to extract gas from the transformer cavity.

[0061] A micro-moisture measuring device 102 is installed at the first air inlet of the first vacuum pump 101. The first air inlet is connected to the inner cavity of the transformer. The micro-moisture measuring device is used to measure the moisture content of the gas from the inner cavity of the transformer.

[0062] A condensate measuring device 103 is installed at the outlet of the first vacuum pump 101 and is used to measure the amount of condensate pumped out by the first vacuum pump.

[0063] Controller 104 includes:

[0064] The first control interface 1041 is electrically connected to the first vacuum pump 101 and is used to transmit an on or off signal to the first vacuum pump 101.

[0065] The second control interface 1042 is used to receive moisture content information sent by the micro-moisture measuring device 102 and forward it to the interactive terminal;

[0066] The third control interface 1043 is used to receive condensate volume information sent by the condensate measuring device 103 and forward it to the interactive terminal.

[0067] In practical applications, a vacuum unit can be used to set up the first vacuum pump 101. The vacuum unit consists of the first vacuum pump, vacuum gauge, vacuum valves, vacuum pipelines, and control components, and is a device capable of obtaining different vacuum levels. A mobile vacuum unit can also be used depending on the site conditions. For example, in situations where the vacuum oil filling site is small, a fixed vacuum unit would occupy space for a long time, hindering other processes. In such cases, a mobile vacuum unit can be used. After the vacuum oil filling process, the vacuum unit is moved out of the site to ensure the smooth progress of other processes.

[0068] In some embodiments of the present invention, the trace moisture measuring device 102 may optionally be a trace moisture measuring instrument. The trace moisture measuring instrument is a specialized instrument for precise detection of gas humidity, suitable for precise and rapid detection of SF6 switch gas humidity in substations and hydrogen humidity in hydrogen production stations and hydrogen-cooled generator sets. It can also be used for humidity detection of special gases in industries such as metallurgy, chemical fiber, and petrochemicals. The resolution of the trace moisture measuring instrument is 0.01℃ or 0.1PPM.

[0069] When the first vacuum pump 101 performs vacuuming operation on the transformer's internal cavity, the water vapor discharged by the first vacuum pump 101 condenses to form condensate. In this embodiment of the invention, the condensate measuring device 103 is located at the outlet end of the first vacuum pump 101, effectively avoiding measurement errors caused by condensate loss and ensuring a highly accurate condensate volume. Furthermore, the location of the condensate measuring device 103 at the outlet end of the first vacuum pump 101 will not interfere with the normal operation of the first vacuum pump 101.

[0070] In some embodiments of the present invention, the condensate measuring device 103 optionally includes a condenser. During the natural condensation of water vapor upon encountering cold air, due to the high gas flow rate extracted by vacuuming, some water vapor may be discharged as gas before it has time to condense. This results in condensate loss and measurement errors in the amount of condensate. In the embodiments of the present invention, the condenser accelerates the condensation of water vapor, avoiding the problem of some water vapor being discharged as gas before it has time to condense during natural condensation, thus avoiding measurement errors caused by condensate loss and ensuring highly accurate condensate measurement.

[0071] In practical applications, the condensate measuring device 103 also includes a condensate collector connected to the condenser, and a measuring instrument for measuring the amount of condensate in the condensate collector. Actual test results show that the condensate measuring device 103 can condense 95% or more of the water vapor in the gas into condensate, obtaining a highly accurate condensate measurement.

[0072] In some embodiments of the present invention, optionally, after the interactive terminal receives the moisture content information and condensate volume information forwarded by the second control interface 1042 and the third control interface 1403, the user associated with the interactive terminal can determine whether the current vacuuming degree meets the moisture content requirement of the transformer cavity based on the moisture content information and condensate volume information. When the moisture content requirement is met, the user can transmit a shutdown signal to the first vacuum pump 101 through the first control interface 1041 to stop the vacuuming operation. The vacuum degree and vacuuming time when the moisture content requirement is met are the vacuuming strategy matched with the currently vacuumed transformer. It is understood that when performing vacuuming operation again, if a transformer of the same model as the one vacuumed previously is encountered, the user can transmit an on or off signal to the first vacuum pump 101 through the first control interface 1041 to implement the vacuuming strategy.

[0073] In some embodiments of the present invention, optionally, "same model" refers to the same transformer internal capacity, the same transformer insulation requirements, the same moisture absorption during final assembly, and the same temperature. This meets the requirements for setting up high-specification transformers.

[0074] In some embodiments of the present invention, optionally, "same model" refers to the same transformer internal capacity. This meets the requirements for installing low-specification transformers.

[0075] In this embodiment of the invention, the vacuum device 100 is equipped with a micro-moisture measuring device 102 for micro-moisture measurement and a condensate measuring device 103 for macro-moisture measurement. The vacuum device 100 obtains moisture data using a dual-channel measurement scheme combining micro and macro measurements. The moisture data obtained from micro-measurement (i.e., moisture content information) and the moisture data obtained from macro-measurement (i.e., condensate volume information) corroborate each other, enabling the vacuum device 100 to achieve highly accurate moisture measurement. Furthermore, by placing the micro-moisture measuring device 102 at the first air inlet of the first vacuum pump 101 and the condensate measuring device 103 at the air outlet of the first vacuum pump 101, high accuracy is ensured in both micro- and macro-measured moisture data. The vacuum device 100 in this embodiment of the invention is equipped with a controller 104. The second control interface 1042 and the third control interface 1043 in the controller 104 forward the moisture data (i.e., moisture content information) obtained from microscopic measurement and the moisture data (i.e., condensate volume information) obtained from macroscopic measurement to the interactive terminal, allowing the user to assess the vacuuming level and determine the vacuuming strategy. The first control interface 1041 in the controller 104 is used to transmit an on / off signal to the first vacuum pump 101, allowing the user to implement the vacuuming strategy by controlling the on / off operation of the vacuuming operation through the controller 104. The vacuuming device of this embodiment can measure and provide highly accurate moisture information to the user. The user can implement the vacuuming strategy by controlling the on / off operation of the vacuuming operation through the controller 104. Using the vacuuming device of this embodiment can avoid insufficient or excessive vacuuming, achieving highly efficient vacuuming operations.

[0076] In some embodiments of the present invention, the vacuum pumping device 100 may optionally further include:

[0077] The vacuum transition tank has its inlet end connected to the transformer cavity via a pipe, and its outlet end connected to the first inlet end via a pipe.

[0078] In this embodiment of the invention, a vacuum transition tank is provided in the vacuum pumping device 100, so that the first air inlet of the first vacuum pump 101 is not directly connected to the inner cavity of the transformer, but is connected via the vacuum transition tank. During the vacuuming operation, impurities such as oil and dust in the inner cavity of the transformer enter the vacuum transition tank along with the gas. The impurities settle in the vacuum transition tank and are not sucked in by the first vacuum pump 101. The vacuum transition tank prevents impurities in the inner cavity of the transformer from entering the first vacuum pump 101, ensuring the stable operation of the first vacuum pump 101 and facilitating the efficient completion of the vacuuming operation.

[0079] To clearly explain the vacuum pumping device 100 of this embodiment of the invention, the following detailed description is provided with reference to examples:

[0080] See Figure 2 As shown, Figure 2 This is a schematic diagram of the vacuum pumping device. The vacuum unit 2 (which is equivalent to the first vacuum pump 101, or the vacuum pump after the first vacuum pump 101 and the second vacuum pump 105 are arranged in series), the micro water measuring device 102 and the condensate measuring device 103 are integrated in the vacuum unit 2.

[0081] Figure 2 In this configuration, the inlet of the vacuum transition tank 10 is connected to the inner cavity of the transformer (not shown in the figure) via pipe 14, and the outlet of the vacuum transition tank 10 is connected to the inlet (i.e., the first inlet) of the vacuum unit 2 via pipe 15. Arrows on pipes 14 and 15 indicate the gas flow direction.

[0082] In some embodiments of the present invention, optionally, the micro-water measuring device 102 includes:

[0083] A micro-moisture measurement probe is installed at the air inlet of the vacuum transition tank, or on the pipe between the air inlet of the vacuum transition tank and the inner cavity of the transformer, to acquire raw moisture data.

[0084] The micro-moisture measurement host is electrically connected to the measurement probe via a signal line. It is used to receive raw moisture data and convert the raw moisture data into moisture content information; it is also used to send the moisture content information to the second control interface.

[0085] To clearly explain the vacuum pumping device 100 of this embodiment of the invention, the following detailed description is provided with reference to examples:

[0086] See Figure 2 As shown, Figure 2 This is a schematic diagram of the vacuum pumping device. The vacuum unit 2 (equivalent to the first vacuum pump 101), the micro-water measuring device 102, and the condensate measuring device 103 are integrated into the vacuum unit 2.

[0087] Figure 2 In this configuration, the inlet of the vacuum transition tank 10 is connected to the inner cavity of the transformer (not shown in the figure) via pipe 14, and the outlet of the vacuum transition tank 10 is connected to the inlet (i.e., the first inlet) of the vacuum unit 2 via pipe 15. Arrows on pipes 14 and 15 indicate the gas flow direction. It can be seen that the gas in pipe 14 flows into the vacuum transition tank 10; the gas in pipe 15 flows into the vacuum unit 2 and is finally discharged through the outlet 4 of the vacuum unit.

[0088] The micro-moisture measuring device 102 is fixed to the vacuum unit 2 using a universal bracket. The micro-moisture measuring device 102 includes a micro-moisture measuring main unit 7 and data acquisition probes 12 and 13. The data acquisition probes 12 and 13 (i.e., micro-moisture measuring probes) are installed at the air inlet end of the vacuum transition tank 10. In practical applications, the data acquisition probes 12 and 13 can be installed on the pipe 14, specifically at the end of the pipe 14 that connects to the air inlet end of the vacuum transition tank 10.

[0089] In this embodiment of the invention, by setting up a vacuum transition tank to prevent impurities in the transformer cavity from entering the first vacuum pump 101, a micro-moisture measurement probe is placed at the air inlet of the vacuum transition tank, or on the pipe between the air inlet of the vacuum transition tank and the transformer cavity. This ensures that the micro-moisture measurement probe can measure the most original gas extracted from the transformer cavity, ensuring high accuracy of the original moisture data. Furthermore, the micro-moisture measurement host performs data conversion, transforming the original moisture data into moisture content information for the user on the interactive terminal to assess the degree of vacuuming, ensuring that the interactive terminal can obtain information efficiently and promptly.

[0090] In some embodiments of the present invention, optionally, the micro-water measuring device 102 includes:

[0091] A micro-moisture measurement probe is installed at the first air inlet end to acquire raw moisture data;

[0092] The micro-moisture measurement host is electrically connected to the measurement probe via a signal line. It is used to receive raw moisture data and convert the raw moisture data into moisture content information; it is also used to send the moisture content information to the second control interface.

[0093] In this embodiment of the invention, a micro-moisture measurement probe is positioned at the first air inlet to ensure that the probe can measure the most original gas extracted from the transformer's internal cavity, thus ensuring high accuracy of the original moisture data. Furthermore, the micro-moisture measurement host performs data conversion, transforming the original moisture data into moisture content information for the user at the interactive terminal to assess the degree of vacuuming, ensuring that the interactive terminal can obtain information efficiently and promptly.

[0094] In some embodiments of the present invention, optionally, at least two micro-water measurement probes are provided, and at least two micro-water measurement probes are electrically connected to the micro-water measurement host via signal lines.

[0095] At least two micro-moisture measuring probes are used to avoid interference from accidental factors in obtaining raw moisture data. Accidental factors include, for example, partial detachment or damage of some micro-moisture measuring probes.

[0096] In some embodiments of the present invention, the second control interface 1042 is optionally wirelessly connected to the micro-moisture measuring device 102. Wireless communication simplifies circuit wiring. Especially in situations where the vacuum oil filling site is cluttered and space is limited, wireless communication allows the vacuum pumping device 100 to be quickly and easily deployed, reducing setup time, improving the efficiency of vacuuming operations, and lowering costs.

[0097] In some embodiments of the present invention, the third control interface 1043 is optionally wirelessly connected to the condensate measuring device 103. Wireless communication simplifies circuit wiring. Especially in situations where the vacuum oil filling site is cluttered or the space is limited, wireless communication allows the vacuuming device 100 to be quickly and easily deployed, reducing setup time, improving the efficiency of vacuuming operations, and lowering costs.

[0098] In some embodiments of the present invention, optionally, the controller 104 further includes:

[0099] Information storage unit, used to store received information;

[0100] The second control interface 1042 is also used to forward moisture content information to the information storage unit;

[0101] The third control interface 1043 is also used to forward condensate water volume information to the information storage unit.

[0102] In this embodiment of the invention, moisture content information and condensate water information are stored in an information storage unit to avoid information loss, and users can conveniently retrieve moisture content information and condensate water information from the information storage unit.

[0103] In some embodiments of the present invention, optionally, the user can retrieve moisture content information and condensate information from the information storage unit through the interactive terminal, and determine the change law of gas content in each transformer during the vacuuming process based on the moisture content information and condensate information, and form a vacuum processing curve matching each transformer product and a criterion for determining whether the vacuuming is complete.

[0104] In some embodiments of the present invention, optionally,

[0105] The controller 104 further includes:

[0106] The fourth control interface is connected to the cloud platform and is used to receive remote operation commands sent by the cloud platform. The remote operation commands are used to control the first control interface to transmit an on or off signal to the first vacuum pump.

[0107] In some embodiments of the present invention, optionally, when far from the vacuum oil injection site, the user can remotely control the opening or closing of the first vacuum pump through a cloud platform, reducing the user's safety risks.

[0108] In some embodiments of the present invention, optionally, after determining the change pattern of gas content in each transformer during the vacuuming process based on moisture content information and condensate information, and forming a vacuum processing curve matching each transformer product and a criterion for determining whether the vacuuming is complete, the vacuum processing curve and the criterion can be integrated into a cloud platform. When a vacuuming operation is required, the user determines whether the transformer to be vacuumed matches the existing vacuum processing curve and criterion; if it matches, the user controls the first control interface through the cloud platform to transmit an start signal to the first vacuum pump; when the first vacuum pump runs to achieve the vacuum processing curve and criterion, the user controls the first control interface through the cloud platform to transmit a stop signal to the first vacuum pump.

[0109] In some embodiments of the present invention, optionally, after determining the change pattern of gas content in each transformer during the vacuuming process based on moisture content information and condensate information, and forming a vacuum processing curve matching each transformer product and a criterion for determining whether vacuuming is complete, the vacuum processing curve and criterion can be integrated into a cloud platform. When vacuuming is required, the cloud platform automatically determines whether the transformer to be vacuumed matches the existing vacuum processing curve and criterion; if it matches, the cloud platform controls the first control interface to transmit an start signal to the first vacuum pump; when the first vacuum pump runs to achieve the vacuum processing curve and criterion, the cloud platform controls the first control interface to transmit a stop signal to the first vacuum pump.

[0110] In some embodiments of the present invention, the first vacuum pump 101 may optionally be a Roots vacuum pump;

[0111] See Figure 3 As shown, Figure 3 This is the second principle block diagram of the vacuum pumping device according to an embodiment of the present invention;

[0112] The vacuum pumping device 100 also includes:

[0113] The second vacuum pump 105 has its inlet end connected to the outlet end of the condensate measuring device 103, and is used to extract gas from the transformer cavity.

[0114] The first control interface 1041 is electrically connected to the second vacuum pump 105 and is used to transmit an on or off signal to the second vacuum pump 105.

[0115] A Roots vacuum pump (abbreviated as Roots pump) is a type of variable displacement vacuum pump containing two lobe-shaped rotors that rotate synchronously in opposite directions. There are small gaps between the rotors and between the rotors and the inner wall of the pump casing, so they do not come into contact with each other.

[0116] The characteristics of a Roots vacuum pump are: fast start-up, low power consumption, low operating and maintenance costs, high pumping speed and efficiency, insensitivity to small amounts of water vapor and dust in the pumped gas, and a large pumping rate within the pressure range of 100–1 Pa, capable of quickly removing suddenly released gas. This pressure range falls precisely between that of an oil-sealed mechanical vacuum pump and a diffusion pump. Therefore, it is often connected in series between a diffusion pump and an oil-sealed mechanical vacuum pump to increase the pumping capacity in the intermediate pressure range. In this case, it is also called a mechanical booster pump.

[0117] Roots vacuum pumps are widely used in smelting, degassing, and rolling in vacuum metallurgy, as well as in vacuum distillation, vacuum concentration, and vacuum drying in the chemical, food, and pharmaceutical industries.

[0118] In this embodiment of the invention, a Roots vacuum pump is used as the first vacuum pump 101, and a second vacuum pump 105 is provided, achieving a series arrangement of the Roots vacuum pump and the second vacuum pump 105. Utilizing the characteristics of the Roots vacuum pump—high pumping speed and high pumping efficiency within a pressure range of 100–1 Pa—the pumping efficiency of the vacuum device in this embodiment of the invention is further improved, ensuring high-efficiency vacuuming operations. In particular, for transformers requiring high internal vacuum levels, the series arrangement of the Roots vacuum pump and the second vacuum pump 105 in this embodiment of the invention ensures that the required high vacuum level is achieved, and ensures high-efficiency vacuuming operations are performed using the vacuum device in this embodiment of the invention.

[0119] In practical applications, an activation signal is first transmitted to the second vacuum pump 105 via the first control interface 1041, and the second vacuum pump 105 begins evacuation. The second vacuum pump 105 operates for a period of time until the gas pressure inside the transformer reaches the set operating pressure of the Roots vacuum pump. Then, an activation signal is transmitted to the Roots vacuum pump via the first control interface 1041, and the Roots vacuum pump begins evacuation. The Roots vacuum pump and the second vacuum pump 105 operate in series to ensure that the evacuated transformer reaches the required vacuum level inside the transformer cavity.

[0120] To clearly explain the vacuum pumping device 100 of this embodiment of the invention, the following detailed description is provided with reference to examples:

[0121] See Figure 2 As shown, Figure 2 This is a schematic diagram of the vacuum pumping device. The vacuum unit 2 (equivalent to the first vacuum pump 101), the micro-water measuring device 102, and the condensate measuring device 103 are integrated into the vacuum unit 2.

[0122] The inlet of the vacuum transition tank 10 is connected to the inner cavity of the transformer (not shown in the figure) via pipe 14, and the outlet of the vacuum transition tank 10 is connected to the inlet (i.e., the first inlet) of the vacuum unit 2 via pipe 15. Arrows on pipes 14 and 15 indicate the gas flow direction.

[0123] The micro-moisture measuring device 102 is fixed to the vacuum unit 2 using a universal bracket. The micro-moisture measuring device 102 includes a micro-moisture measuring main unit 7 and data acquisition probes 12 and 13. The data acquisition probes 12 and 13 (i.e., micro-moisture measuring probes) are installed on the air inlet pipe 11 at the air inlet end of the vacuum transition tank 10. In practical applications, the data acquisition probes 12 and 13 can be set on the pipe 14, specifically at the end of the pipe 14 that connects to the air inlet end of the vacuum transition tank 10.

[0124] Probes 12 and 13 are electrically connected to the micro-water measurement host 7 via signal lines 8 and 9, respectively. The micro-water measurement host 7 is connected to the control cabinet 3 of the vacuum unit 2 via power line 5 and signal line 6.

[0125] The condensate measurement control cabinet 16 in the condensate measurement device 103 is connected to the vacuum unit control cabinet 3 via signal line 17 and power line 18.

[0126] During transformer evacuation, the vacuuming device detects and judges the gas dew point and water content (water content, i.e., moisture content) in the transformer evacuation pipeline to determine the effectiveness of the evacuation, degassing, and dehydration. The gas dew point and water content data can be stored and synchronized to generate curves, and can be preserved long-term. The dew point and water content data, records, and curves are connected to the existing wireless transmission module of vacuum unit 2 via an external fast interface and data cable, ensuring stable and effective data transmission to the control platform of the automatic vacuum oil injection system and enabling data interaction and synchronization. The system participates in automatic control through unified settings on the control platform. Furthermore, the device is connected to various probes installed and connected to the designated evacuation interface of vacuum transition tank 10 via wiring. The overall system features high intelligence, accurate display, strong stability, ease of operation, and unified data acquisition and transmission control.

[0127] Micro-water measurement device 102 function AI:

[0128] A. The micro-moisture measuring device 102 is positioned between the transformer body and the vacuum transition tank 10, and can be combined and matched with the designated mobile vacuum unit 2. Through the added fixing device between the two, it should be able to be quickly combined with the vacuum unit 2 as a whole, and then quickly connected to the vacuum transition tank 10 and the transformer evacuation pipeline for measurement. It can also be quickly disassembled and used in combination with other different vacuum transition tanks 10 and mobile vacuum units 2.

[0129] B. The vacuum unit 2 matched with the micro-water measurement device 102 is existing equipment, and the maximum pumping speed of the mobile vacuum unit 2 is 2000-4000 m / s. 3 / h, but the maximum should be able to meet the requirements of 4000~9000m 3 The vacuum unit 2 is matched and effectively used at a capacity of / h. The corresponding evacuated transformer has a volume of 6–150 m³ / h. 3 The insulation weight of a single transformer is 2 to 20 tons.

[0130] C. The control system and data and curve storage of the micro-water measurement device 102 should be able to be quickly connected to the existing automatic vacuum oil injection system for transmission and parameter control.

[0131] D. The micro-water measurement device 102 uses high-precision dew point, vacuum, and pumping speed sensors (either joint venture or imported) as its core. It can accurately, stably, and continuously display dew point and water output rate under a vacuum environment of ≤133Pa, and can automatically record and generate matching curves that can be stored long-term. Specifically, the vacuum measurement range is 0.1~133Pa; the dew point measurement range is -100~+20℃; and the water output rate measurement range is 0~100g / th.

[0132] E. The control system of the micro-water measurement device 102 is equipped with a control display panel, and can be set and queried, and realize data transmission and copying.

[0133] F. The micro-water measurement device 102 can meet the user's need to customize parameters such as dew point, water output rate, and insulation weight through the automatic oiling system interface, and enable the micro-water measurement device 102 to participate in the control of the automatic vacuum oiling system, while achieving synchronization between the two.

[0134] G. The micro-moisture measuring device 102 has a high-speed data transmission interface, enabling data upload. It connects to the existing wireless transmission module of the mobile vacuum unit 2 via an external high-speed interface and data cable, ensuring stable and effective data transmission to the control platform of the automatic vacuum oil injection system and enabling data interaction and synchronization. It participates in the system's automatic control through unified settings on the control platform. Various probes installed and connected to the designated evacuation interface of the vacuum transition tank 10 are connected via wiring.

[0135] H. The micro-moisture measuring device 102 is easy to move and quick to lift. It can be quickly fixed to existing mobile vacuum units 2 through quick connection, and can be used independently or in conjunction with existing automatic vacuum oil injection systems. The specific installation structure and connection method should be based on the user's opinion.

[0136] I. The micro-water measuring device 102 can be connected and disassembled quickly through a quick-connect structure for all pipelines, circuits, control lines and installation and fixing of the vacuum transition tank 10 and the vacuum unit 2, so as to be used in combination with other vacuum units 2 and vacuum transition tanks 10.

[0137] The condensate measuring device 103 can be an integrated condensate collection device. A matching integrated condensate collection device is installed at the exhaust end of the mobile vacuum unit 2 to efficiently condense, intelligently collect, measure, store, and output data of the water vapor discharged from the transformer during evacuation, and to participate in the automatic control of the vacuum oil injection system, without affecting the normal operation of the vacuum unit 2. Furthermore, test data is connected to the existing wireless transmission module of the vacuum unit 2 via an external high-speed interface and data cable, ensuring stable and effective data transmission to the control platform of the automatic vacuum oil injection system and enabling data interaction and unification.

[0138] Functions of the integrated condensate collection device (A1 to A3):

[0139] A1. In the process of vacuum drying and final sealing of various oil-immersed transformers by mobile vacuum unit 2, all extracted water vapor can be reduced to a relatively constant low temperature (transformer outlet temperature ≤50℃), achieving efficient and maximized water vapor condensation and real-time collection and measurement.

[0140] A2. After condensation by the integrated condensation collection device, it can condense 95% or more of the moisture in all the gas extracted from the transformer by the vacuum unit 2, and the dew point range of the condensed gas is -80℃ to -20℃.

[0141] A3. The integrated condensate collection device can automatically collect and accurately measure the amount of water collected per hour (the water in the automatic collection and detection unit can be visually observed, and the maximum water volume collected per hour meets the actual needs, with an hourly water weight measurement accuracy of no more than 1‰) and discharge it. After measurement, the water is discharged into a large liquid collection tank (the liquid collection tank can meet the water storage capacity of a single product of no less than 25kg and has a liquid level observation window).

[0142] Functions B1 to B7 of the automatic control equipment (i.e., the controller, not shown in the diagram):

[0143] B1. The power supply required for the automatic control equipment should be preferentially connected to the power supply of the control cabinet 3 of the vacuum unit 2. The overall wiring should be protected by protective cable trays according to specifications to ensure neatness, aesthetics, and secure fixing.

[0144] B2. The modified micro-water measurement and condensation collection sections should be self-contained and easily fixedly connected to vacuum unit 2 via quick-connect assembly, achieving technological unification and integration.

[0145] B3. Automatic control equipment can generate records and corresponding curves and store them for a long time while automatically detecting and measuring.

[0146] B4. The automatic control equipment comes with its own control cabinet and control display panel, and can perform settings and queries, as well as data transmission and copying. It is integrated near or with the vacuum unit control cabinet 3, and all data is connected to the existing data transmission module of the vacuum unit 2 via signal lines, ensuring stable and effective internal and external data transmission.

[0147] B5. The control parameters of the automatic control equipment can be transmitted to other control platforms and data interaction and synchronization can be achieved, while ensuring the overall operation and consistency. It can also participate in the system's automatic control through unified settings on the control platform. Furthermore, the equipment is connected via wiring to various probes installed and connected to the designated evacuation interface of the vacuum transition tank.

[0148] B6. The automatic control equipment has a high-speed data transmission interface, enabling the uploading of micro-water measurement data and condensate metering data and curves to the matching automatic vacuum oil injection system control module. It can also participate in the automatic control of the oil injection system by setting parameters for the water output. Furthermore, it allows for copying stored data using a USB flash drive.

[0149] B7. With the above configuration and control system in place, during the vacuuming operation, the automatic control equipment continuously and automatically measures and analyzes indicators such as vacuum degree, micro-water index, condensate change, and time. Once the vacuum degree, micro-water index, condensate change, and the converted water output rate meet the specified indicators, the vacuuming will automatically stop, and the data of the entire process will be recorded and generated as a curve.

[0150] The following explains in detail the operating principle of the vacuum pumping device in this embodiment of the invention:

[0151] See Figure 2 After the vacuum piping is connected as shown, first empty the storage tank of the integrated condensate collection device; then turn on the integrated condensate collection device until the cooling temperature of the condenser drops below -20 degrees Celsius; turn on vacuum unit 2 and micro-water measuring device 102 to enter the vacuum treatment stage of the transformer. During this period, the water-containing gas extracted from the transformer passes through the condenser and is rapidly cooled to a constant temperature before condensing into water. The condensate first enters the condensate collection device of the integrated condensate collection device. Every 1 hour, the collected condensate is discharged into the storage tank, and the discharge volume is recorded. This process is continuous, generating an hourly (can be set to any time as needed) condensate discharge data report and continuous curve.

[0152] Because this integrated condensation collection device has a condensation efficiency of 95% or higher, the condensate discharge is thorough and accurately reflects the moisture content of the gas extracted from the transformer cavity. Simultaneously, the transformer's water discharge rate can be continuously calculated based on the transformer's insulation weight. According to its variation pattern and curve, the corresponding variation pattern and inflection point can also be determined, thus providing a more reasonable judgment on whether the transformer evacuation process has effectively ended based on the macroscopic indicator of condensate volume. The above data and curves can be queried and set on control cabinet 16, and simultaneously transmitted to the vacuum unit control cabinet data module for unified management and external output via a data cable connected to vacuum unit control cabinet 3.

[0153] During the above process, when the vacuum level detected by the probe in the inlet pipeline of the vacuum transition tank is ≤133Pa, the accurate water output rate can be calculated using multiple data points from the micro-water measurement device 102. This water output rate is more refined and accurate, and it also generates continuous data reports and curves simultaneously. This allows for easy determination of the changing patterns, curve trends, and inflection points of the micro-water index during continuous evacuation and dehydration, thus providing a more reasonable judgment on whether the transformer evacuation process has effectively ended based on the microscopic indicators of trace moisture in the extracted gas.

[0154] As can be seen from the above process, by analyzing the changes in macroscopic condensate output and selecting parameters during the transformer vacuum treatment process, as well as the changes in trace moisture in the extracted gas and selecting parameters through various probes, simultaneous measurement of dual indicators and determination of final parameters, it is possible to accurately and reliably achieve automatic detection and determination during the transformer vacuum treatment process, forming a unique vacuum treatment curve suitable for each transformer under comprehensive factors and an efficient and reasonable termination point under the final determination parameters.

[0155] This invention provides a transformer vacuum oil injection device, including any of the vacuum pumping devices described in this invention.

[0156] In practical applications, transformer vacuum oil injection equipment should also include an oil injection device for injecting oil into the transformer cavity after the vacuuming operation is completed.

[0157] This invention provides a vacuuming method applied to an interactive terminal; see [link to relevant documentation]. Figure 4 As shown, Figure 4 This is a schematic flowchart of a vacuuming method according to an embodiment of the present invention. The vacuuming method includes:

[0158] Step S1: Receive moisture content information and condensate volume information;

[0159] Step S2: Based on the moisture content information and condensate content information, determine the vacuuming strategy that matches the first transformer currently being evacuated. The vacuuming strategy includes: water output rate, condensate change rate, vacuum degree and vacuuming time.

[0160] Step S3: When vacuuming again, if the target transformer to be vacuumed is the same model as the first transformer, control the vacuuming device to vacuum the target transformer according to the vacuuming strategy.

[0161] In step S2 of this embodiment of the invention, by combining the moisture data obtained from microscopic measurements (i.e., moisture content information) and the moisture data obtained from macroscopic measurements (i.e., condensate volume information), the vacuuming node required to be reached in the transformer cavity when the required moisture content is met can be accurately determined. Based on the vacuuming node, the water output rate (rate of change of moisture content) and the condensate change rate (rate of change of condensate volume) at the end of vacuuming are further determined. Combining the moisture data obtained from microscopic measurements (i.e., moisture content information) and the moisture data obtained from macroscopic measurements (i.e., condensate volume information) can also accurately determine the vacuum level required to be reached in the transformer cavity when the required moisture content is met, and the duration of the vacuuming operation (vacuuming time) required to meet the required moisture content is also accurately determined. The aforementioned water output rate, condensate change rate, vacuum level, and vacuuming time constitute a vacuuming strategy matching the first transformer.

[0162] When dealing with a new type of transformer, each vacuuming operation can only determine the vacuuming strategy that matches the first transformer being vacuumed. However, since a vacuuming operation for the first transformer has already been completed, when vacuuming other transformers, if the target transformer to be vacuumed is the same model as the first transformer, the vacuuming strategy that matches the first transformer can be directly used for vacuuming. This saves the time spent determining the vacuuming strategy for the target transformer and improves the efficiency of the vacuuming operation.

[0163] In some embodiments of the present invention, optionally, "same model" refers to the same transformer voltage level, kVA capacity, same transformer insulation requirements, same moisture absorption environment during final assembly, and same temperature (here, "same temperature" means the temperature is within a preset temperature threshold range). This meets the requirements for high-specification transformers. In some embodiments of the present invention, optionally, "same model" refers to the same transformer voltage level and the same kVA capacity. This meets the requirements for low-specification transformers. It is understood that determining whether a low-specification transformer is of the same model based on the same voltage level and the same kVA capacity can reduce the frequency of needing to re-determine the vacuuming strategy for the target transformer, saving the time spent on re-determining the vacuuming strategy for the target transformer, and improving the efficiency of vacuuming operations, while meeting the low-specification voltage level and low-specification kVA capacity requirements of the low-specification transformer.

[0164] In this embodiment of the invention, by receiving moisture content information and condensate volume information, a vacuuming strategy for the first transformer currently being vacuumed is determined based on the moisture content information and condensate volume information. Combining the moisture data obtained from microscopic measurements (i.e., moisture content information) and the moisture data obtained from macroscopic measurements (i.e., condensate volume information) facilitates obtaining a highly accurate vacuuming strategy. Furthermore, after obtaining a highly accurate vacuuming strategy, when vacuuming again, if the target transformer to be vacuumed is of the same model as the first transformer, the vacuuming device is controlled to vacuum the target transformer according to the vacuuming strategy, avoiding situations where insufficient or excessive vacuuming easily occurs, thus achieving highly efficient vacuuming operations.

[0165] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. A vacuum pumping device, characterized in that, include: The first vacuum pump is used to extract gas from the transformer's internal cavity. A micro-moisture measuring device is installed at the first air inlet of the first vacuum pump, and the first air inlet is connected to the inner cavity of the transformer. The micro-moisture measuring device is used to measure the moisture content of the gas from the inner cavity of the transformer. A condensate measuring device is installed at the outlet of the first vacuum pump to measure the amount of condensate pumped out by the first vacuum pump. The controller includes: The first control interface is electrically connected to the first vacuum pump and is used to transmit an on or off signal to the first vacuum pump. The second control interface is used to receive moisture content information sent by the micro-moisture measuring device and forward it to the interactive terminal; The third control interface is used to receive the condensate volume information sent by the condensate measuring device and forward it to the interactive terminal, so that the interactive terminal can determine the vacuuming strategy based on the moisture content information and the condensate volume information.

2. The vacuum pumping device according to claim 1, characterized in that, Also includes: A vacuum transition tank, wherein the air inlet of the vacuum transition tank is connected to the inner cavity of the transformer via a pipe, and the air outlet of the vacuum transition tank is connected to the first air inlet via a pipe.

3. The vacuum pumping device according to claim 2, characterized in that: The micro-water measuring device includes: A micro-moisture measurement probe is installed at the air inlet of the vacuum transition tank, or on the pipe between the air inlet of the vacuum transition tank and the inner cavity of the transformer, for acquiring raw moisture data; The micro-moisture measurement host is electrically connected to the micro-moisture measurement probe via a signal line. It is used to receive the raw moisture data and convert the raw moisture data into moisture content information; it is also used to send the moisture content information to the second control interface.

4. The vacuum pumping device according to claim 1, characterized in that: The micro-water measuring device includes: A micro-moisture measurement probe is installed at the first air inlet end to acquire raw moisture data; The micro-moisture measurement host is electrically connected to the micro-moisture measurement probe via a signal line. It is used to receive the raw moisture data and convert the raw moisture data into moisture content information; it is also used to send the moisture content information to the second control interface.

5. The vacuum pumping device according to claim 3 or 4, characterized in that: The micro-water measurement probe has at least two probes, and both probes are electrically connected to the micro-water measurement host via signal lines.

6. The vacuum pumping device according to claim 1, characterized in that: The second control interface is wirelessly connected to the micro-water measurement device.

7. The vacuum pumping device according to claim 1, characterized in that: The third control interface is wirelessly connected to the condensate measuring device.

8. The vacuum pumping device according to claim 1, characterized in that: The controller further includes: Information storage unit, used to store received information; The second control interface is also used to forward the moisture content information to the information storage unit; The third control interface is also used to forward the condensate water volume information to the information storage unit.

9. The vacuum pumping device according to claim 1, characterized in that: The controller further includes: The fourth control interface is connected to the cloud platform and is used to receive remote operation commands sent by the cloud platform. The remote operation commands are used to control the first control interface to transmit an on or off signal to the first vacuum pump.

10. The vacuum pumping device according to claim 1, characterized in that: The first vacuum pump is a Roots vacuum pump; The vacuum pumping device also includes: The second vacuum pump, whose inlet end is connected to the outlet end of the condensate measuring device, is used to extract gas from the transformer cavity. The first control interface is electrically connected to the second vacuum pump and is used to transmit an on or off signal to the second vacuum pump.

11. A transformer vacuum oil injection device, characterized in that, include: The vacuum device as described in any one of claims 1 to 10.

12. A vacuuming method, characterized in that, Applied to the interactive end, including: It receives moisture content information from a micro-moisture measuring device and condensate volume information from a condensate measuring device. Based on the moisture content information and the condensate volume information, a vacuuming strategy matching the first transformer currently being evacuated is determined. The vacuuming strategy includes: water output rate, condensate change rate, vacuum degree, and vacuuming time. Specifically, determining the vacuuming strategy matching the first transformer currently being evacuated includes: determining the vacuuming node required for the transformer cavity to meet the required moisture content; determining the water output rate and condensate change rate at the end of vacuuming based on the vacuuming node; and combining the moisture content information and condensate volume information to determine the required vacuum degree for the transformer cavity to meet the required moisture content, and accurately determining the duration of vacuuming operation (i.e., vacuuming time) required for the vacuuming device to meet the required moisture content. When vacuuming again, if the target transformer to be vacuumed is the same model as the first transformer, the vacuuming device is controlled to vacuum the target transformer according to the vacuuming strategy. The vacuum pumping device is the vacuum pumping device as described in any one of claims 1 to 10.

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