Transformer oil and gas automatic sampling device and method

Abstract

The invention belongs to the technical field of transformer equipment, and particularly relates to an automatic sampling device and method for transformer oil and gas. The device comprises a control box and a sampling sealing box, wherein a display screen, a keyboard and a code scanning module are arranged at the front part of a box body of the control box; the sampling sealing box comprises a sampling sealing box cover and a sampling sealing box body, a sampling bag support is arranged in the sampling sealing box body, the sampling bag is arranged on the sampling bag support, and a two-way valve is arranged at the top of the sampling bag; a sampling chamber air outlet pipeline, a sampling chamber air inlet pipeline, a third pipeline and a fourth pipeline are arranged on one side, connected with the sealing box, of the control box; the third pipeline and the fourth pipeline are respectively connected with the two-way valve; a first vacuum pump gas inlet pipeline, a second vacuum pump gas outlet pipeline, a waste liquid tank pipeline, a transformer oil sample pipeline and a transformer gas sample pipeline are arranged at the rear part of the control box. According to the invention, the convenience, safety and reliability of transformer oil and gas sampling are comprehensively improved, and powerful technical support is provided for safe and stable operation of a power system.

Description

Technical Field

[0001] The present invention belongs to the technical field of transformer equipment, and particularly relates to a device and method for automatically sampling transformer oil and gas. Background Art

[0002] The insulating oil used in transformers not only plays a crucial role in insulation and heat dissipation but also serves as an important information medium. By accurately measuring key parameters such as the moisture content, breakdown voltage, dielectric loss, and furan in the insulating oil, the actual operating state of the transformer can be effectively evaluated. In addition, when a transformer encounters a thermal or electrical fault, specific gases are generated, and some of these gases dissolve in the insulating oil to form dissolved gases in the oil. Measuring the dissolved gases in the oil can also provide important clues about the health status of the transformer. Therefore, the performance test of transformer oil is particularly important.

[0003] In addition, when a transformer is abnormal, gases are generated and accumulate in the gas relay. To deeply analyze the health status of the transformer, it is necessary to sample and analyze the gases accumulated in the gas relay through the transformer gas collection box. However, due to the differences in the sampling test contents of transformer oil and gas, the matters needing attention in the sampling process are also different.

[0004] The national standard "GB / T 7597 Sampling Method for Power Transformer Oil (Transformer Oil, Turbine Oil)" stipulates the sampling requirements for transformer oil. For example, for oil samples used for moisture and dissolved gas analysis in oil, the sampling process must be kept fully sealed, that is, the sampling connection method must be reliable to prevent the escape of dissolved moisture and gases in the oil and avoid mixing in air. During the operation, it must be ensured that no bubbles are generated in the oil. When using a syringe to take an oil sample, the operation method specified by the standard must also be followed. It should be noted that the sampling method of transformer oil requires a relatively high professional quality of the operator and usually requires certain practical experience. In addition, glassware such as wide-mouth bottles and syringes used in the sampling process of transformer oil samples is relatively fragile, so higher requirements are put forward for transportation and storage conditions.

[0005] For example, the invention patents with application numbers 202410369550.4 and 202211080969.5 respectively focus on sampling transformer oil and sampling the gas in the transformer gas relay, but they are not a set of devices that can simultaneously sample transformer oil and gas. Neither of them can standardize the sample container.

[0006] The current technical solutions on the market have several significant disadvantages and deficiencies, including: (1) Limitation of sampling range: Currently, most technical solutions are limited to separately sampling transformer oil, lacking an integrated device that can simultaneously complete the sampling of transformer oil samples and the gas in the transformer gas relay after a light gas alarm. This limitation of single function not only increases the operation complexity but also restricts the comprehensiveness and accuracy of fault diagnosis. In addition, some sampling processes still rely on manual operation, which is not only inefficient but also vulnerable to subjective factors such as the experience level and operating habits of operators, thus affecting the objectivity and reliability of sampling results.

[0007] (2) Fragility of sampling and preservation materials: Some existing sampling devices still widely use glass products such as glass syringes and glass bottles during sampling, sample preservation, and transportation. Although glass materials perform well in terms of chemical inertness, their inherent fragility poses great challenges to the complete preservation and long-distance transportation of samples. Once damaged, it will not only lead to sample contamination or loss but also increase additional processing costs and time costs, reducing the overall work efficiency.

[0008] (3) Non-digitalization of management processes: In the series of processes of sample collection, testing, and result analysis in existing technical solutions, the concept of closed-loop management is generally lacking, and advanced digital management means have not been introduced. This deficiency in management leads to poor information flow, low efficiency in data recording and analysis, and it is difficult to achieve instant feedback and accurate decision-making for transformer condition monitoring. In addition, the lack of digital recording and tracking also increases the risk of human error, affecting the accuracy of fault warning and diagnosis.

[0009] In summary, the existing technical solutions have obvious defects in the sampling scope, material selection, and management processes, and these deficiencies limit the efficiency and accuracy of transformer condition monitoring. Summary of the Invention

[0010] Aiming at the deficiencies in the existing technologies such as the limitation of the sampling scope of the transformer sampling device, low automation level, fragility of sample containers, and low digitalization level of the sample management process, the present invention provides an automatic sampling device and method for transformer oil and gas. Its purpose is to achieve the invention purpose of comprehensively improving the convenience, safety, and reliability of sampling transformer oil and gas through an integrated, digital, and durable material sampling device, and providing strong technical support for the safe and stable operation of the power system.

[0011] The technical solution adopted by the present invention to achieve the above purpose is: An automatic sampling device for transformer oil and gas includes a control box and a sampling sealing box. The control box contains a display screen, a keyboard and a code scanning module, all of which are arranged at the front of the control box body. The sampling sealing box includes a sampling sealing box cover and a sampling sealing box body. A sampling bag support is provided inside the sealing box body, and a sampling bag is placed on the sampling bag support. A two-way valve is provided at the top of the sampling bag. On one side wall of the control box connected to the sealing box, there are a sampling chamber outlet pipe, a sampling chamber inlet pipe, a third pipe and a fourth pipe. The third pipe and the fourth pipe are respectively connected to the two-way valve. At the rear of the control box, there are a first vacuum pump inlet pipe, a second vacuum pump outlet pipe, a waste liquid tank pipe, a transformer oil sample pipe and a transformer gas sample pipe. The waste liquid tank pipe is connected to the waste liquid tank, and the other end of the waste liquid tank pipe is respectively connected to the third pipe and the transformer oil sample pipe. The interface of the transformer oil sample pipe is connected to the transformer oil sampling port, and the interface of the transformer gas sample pipe is connected to the transformer gas collection box. The interfaces on the vacuum pump inlet pipe and the vacuum pump outlet pipe are respectively communicated with the atmosphere, and the other ends of the vacuum pump inlet pipe and the vacuum pump outlet pipe are connected to the vacuum pump.

[0012] Furthermore, the upper part of the sampling bag is a slope structure, and a two-dimensional code for storing sampling information and sample information is provided on the surface of the sampling bag.

[0013] Furthermore, the bag body of the sampling bag and the two-way valve are of an integrated structure. When taking an oil sample, the two-way valve is connected to the third pipe; when taking a gas sample, the two-way valve is connected to the fourth pipe. The sampling bag is made of oil-resistant plastic material.

[0014] An automatic sampling method for transformer oil and gas is realized by using any one of the above-mentioned automatic sampling devices for transformer oil and gas, and includes the following steps: Step 1. Determine the sampling information through the mobile phone APP. Step 2. Generate a two-dimensional code, print it and paste it on the surface of the sampling bag. Step 3. At the sampling site, determine the device working mode by scanning the code and complete the sampling. Step 4. In the laboratory, test the content of fault gases in the sample by scanning the code. Step 5. Automatically save the test results through an offline chromatograph detector and upload them to the cloud database.

[0015] Furthermore, the sampling information includes: sampling method and sample information, and the sampling method includes transformer oil sampling or gas sampling.

[0016] Furthermore, the sample information includes: unit, equipment name, model, sampling date, sampling location, sampling weather, operating load, oil grade and sampling volume.

[0017] Further, for the automatic sampling method of transformer oil and gas, when taking a transformer oil sample: The method for adjusting the sampling sealed box to a negative pressure state is as follows: Connect the transformer oil sample pipeline to the transformer oil extraction valve, close the electric two-way valve, and adjust the vacuum pump to make the sampling sealed box in a negative pressure state: Close the intake pipeline of the first vacuum pump, open the outlet pipeline of the sampling chamber and the first pipeline; Close the intake pipeline of the sampling chamber, open the outlet pipeline of the second vacuum pump and the second pipeline; The vacuum pump operates, and the gas in the sampling sealed box is discharged through the outlet pipeline of the sampling chamber, the first electric three-way valve, the first pipeline, the vacuum pump, the second pipeline, the second electric three-way valve, and the outlet pipeline of the second vacuum pump, causing the air pressure in the sampling sealed box to drop to a negative pressure state; The method for adjusting the sampling sealed box to a positive pressure state is as follows: Close the outlet pipeline of the sampling chamber, open the intake pipeline of the first vacuum pump and the first pipeline; Close the outlet pipeline of the second vacuum pump, open the second pipeline and the intake pipeline of the sampling chamber; The vacuum pump operates, and air enters the sampling sealed box through the intake pipeline of the first vacuum pump, the first electric three-way valve, the first pipeline, the vacuum pump, the second pipeline, the second electric three-way valve, and the intake pipeline of the sampling chamber, causing the air pressure in the sampling sealed box to rise to a positive pressure state; Before sampling, place the sampling bag vertically in the sampling bag support in the sampling sealed box, open the two-way valve, connect the transformer oil sample pipeline to the transformer oil extraction port, the third electric three-way valve closes the third pipeline, the waste liquid tank pipeline is connected to the transformer oil sample pipeline, the two-way valve is connected, open the transformer oil extraction port, and start automatic sampling. Then, the transformer oil sample flows into the waste liquid tank through the transformer oil sample pipeline, the third electric three-way valve, and the waste liquid tank pipeline. At the same time, the bubble sensor is turned on to detect the bubble state in the waste liquid tank pipeline in real time. When the bubble sensor does not detect bubbles, the pipeline is rinsed and the gas in the pipeline has been discharged; Rinsing of the sampling bag: When the bubble sensor does not detect bubbles, the third electric three-way valve operates to close the waste liquid tank pipeline, and the transformer oil sample pipeline and the third pipeline are opened; The vacuum pump operates, making the sampling sealed box in a negative pressure state; The transformer oil enters the sampling bag through the transformer oil sample pipeline, the third electric three-way valve, the third pipeline, the flowmeter, and the two-way valve; The third electric three-way valve operates to close the transformer oil sample pipeline, and the third pipeline and the waste liquid tank pipeline are opened; The sampling sealed box becomes in a positive pressure state; The transformer oil in the sampling bag is extruded under positive pressure, flows reversely through the flowmeter, and enters the waste liquid tank through the third pipeline, the third electric three-way valve, the waste liquid tank pipeline, and the two-way valve. When the volume of the flowing transformer oil is equal to the volume of the flowing transformer oil, one rinsing of the sampling bag is completed; Transformer oil sampling process: The third electric three-way valve operates to close the waste liquid tank pipeline and open the transformer oil sample pipeline and the third pipeline; the vacuum pump operates to make the sampling sealed box in a negative pressure state; the transformer oil enters the sampling bag through the transformer oil sample pipeline, the third electric three-way valve, the third pipeline, the flowmeter, and the two-way valve. At the same time, the flowmeter calculates the volume of the transformer oil flowing through. After meeting the sampling requirements, the third electric three-way valve operates to close the third pipeline; the vacuum pump is turned off, and the first electric three-way valve operates to close the first pipeline, open the sampling chamber outlet pipeline and the first vacuum pump inlet pipeline, restore the pressure in the sampling sealed box to atmospheric pressure, open the lid of the sampling sealed box, close the two-way valve, and take out the sampling bag.

[0018] Furthermore, in the described automatic sampling method for transformer oil and gas, when taking a gas sample, connect the transformer gas sample pipeline to the gas sampling plug of the transformer gas collection box; the third electric three-way valve operates to close the third pipeline, the electric two-way valve is opened, and the vacuum pump operates to make the sampling sealed box in a negative pressure state; the gas in the gas collection box automatically enters the sampling bag through the transformer gas sample pipeline, the electric two-way valve, and the fourth pipeline; after the sampling time meets the requirements, the electric two-way valve is closed; the vacuum pump is turned off, the first electric three-way valve operates to close the first pipeline, open the sampling chamber outlet pipeline and the first vacuum pump inlet pipeline, restore the pressure in the sampling sealed box to atmospheric pressure, open the box lid, close the two-way valve, and take out the sampling bag to complete the automatic sampling of the gas.

[0019] A computer device includes a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor. When the processor executes the computer program, it implements the steps of any one of the described automatic sampling methods for transformer oil and gas.

[0020] A computer storage medium stores a computer program. When the computer program is executed by a processor, it implements the steps of any one of the described automatic sampling methods for transformer oil and gas.

[0021] The present invention has the following beneficial effects and advantages: The present invention has a digital management system for transformer oil or gas samples, which can comprehensively improve the automation and intelligence levels of the sampling, testing, and data analysis processes.

[0022] The device of the present invention solves the following technical problems: (1) This device integrates the sampling functions for transformer oil and the gas in the gas relay in the transformer gas collection box. That is, it can be used to accurately sample transformer oil from the transformer body and the on-load tap-changer, and at the same time, it also has the function of efficiently collecting gas samples from the gas collection box. The whole process realizes automatic operation, effectively avoiding the interference of human factors. The sampling process strictly follows the standard requirements to ensure that no air bubbles are mixed into the oil sample and effectively isolates the direct contact between the oil sample and the air, thus ensuring the accuracy and representativeness of the sampling results.

[0023] (2) The sampling bag in the present invention not only has excellent sealing performance and can safely store the transformer oil sample and gas sample at the same time, but also its light and durable characteristics make the transportation and storage processes more convenient. Compared with glass products, this sampling bag significantly reduces the risk of breakage during transportation and does not require additional special storage measures, thus reducing the overall sampling cost and improving work efficiency.

[0024] (3) By introducing the two-dimensional code technology, the present invention realizes the comprehensive digital management of the sampling, testing and data analysis processes. This innovative measure ensures that every step from sampling to final data analysis is traceable and verifiable, greatly reducing the wrong information caused by human factors, such as sample matching errors, etc., thus further improving the accuracy and reliability of data processing.

[0025] By integrating the sampling function, realizing automatic operation, innovating the sampling bag design and introducing the two-dimensional code technology, the present invention effectively overcomes the limitations of the existing sampling devices, significantly improves the sampling range and automation level, reduces the risk of sample container breakage and the overall sampling cost, and at the same time realizes the comprehensive digital management of the sampling, testing and data analysis processes, thus ensuring the accuracy and representativeness of the sampling results, improving the accuracy and reliability of data processing, and providing an efficient, accurate and reliable sampling solution for the operation and maintenance and fault diagnosis of transformers. Description of the Drawings

[0026] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where: Figure 1 is a schematic structural diagram of the device of the present invention; Figure 2 is a schematic rear structural diagram of the device of the present invention; Figure 3 is a schematic structural diagram of the sampling bag in the device of the present invention; Figure 4 is a schematic diagram of automatically sampling transformer oil in the present invention; Figure 5 is a schematic diagram of automatically sampling the gas in the transformer gas relay after the light gas alarm in the present invention; Figure 6 This is a flow chart of an automatic sampling method for transformer oil and gas in the present invention.

[0027] In the figure: vacuum pump 1, sampling sealed box 2, sampling bag 3, waste liquid tank 4, flow meter 5, bubble sensor 6, sampling chamber outlet pipeline 7, first electric three-way valve 8, first vacuum pump inlet pipeline 9, first pipeline 10, sampling chamber inlet pipeline 11, second electric three-way valve 12, second vacuum pump outlet pipeline 13, second pipeline 14, double-pass valve 15, third pipeline 16, third electric three-way valve 17, waste liquid tank pipeline 18, transformer oil sample pipeline 19, fourth pipeline 20, electric double-pass valve 21, transformer gas sample pipeline 22, display screen 23, keyboard 24, barcode scanning module 25, control box 26, sampling sealed box cover 27, sampling bag support 28, sampling sealed box body 29, double-pass valve 30. Specific implementation manners

[0028] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below in conjunction with the drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0029] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0030] The following refers to Figures 1-6 Describe the technical solutions of some embodiments of the present invention.

[0031] Embodiment 1

[0032] The present invention further provides an embodiment, which is an automatic sampling device for transformer oil and gas.

[0033] As Figure 1 shown, Figure 1It is a schematic structural diagram of the device of the present invention. The device consists of a control box 26 and a sampling and sealing box 2; among them, the control box 26 includes a display screen 23, a keyboard 24, and a code scanning module 25, all of which are arranged at the front of the box body of the control box 26; the display screen 23 is used to display the current working state of the device and relevant operation prompts, the keyboard 24 is used to select corresponding functions, including the emergency stop function, and the code scanning module 25 is used to scan the two-dimensional code on the sampling bag 3 to identify the working mode that the device should perform. The sampling and sealing box 2 is composed of a sampling and sealing box cover 27 and a sampling and sealing box body 29. After the sampling and sealing box cover 27 is closed, airtightness can be achieved; a sampling bag support 28 is provided in the sampling and sealing box 2, and the sampling bag support 28 is directly adhered to the bottom of the sealing box 2 to ensure that the sampling bag 3 remains vertical during the sampling process, facilitating the discharge of transformer oil and air bubbles.

[0034] On one side wall of the control box 26 connected to the sealing box 2, there are a sampling chamber outlet pipeline 7, a sampling chamber inlet pipeline 11, a third pipeline 16, and a fourth pipeline 20; the sampling chamber outlet pipeline 7 and the sampling chamber inlet pipeline 11 do not need to be connected to other parts and are used to control the gas inlet and outlet in the sampling and sealing box 2 to control the internal air pressure. The third pipeline 16 is used to connect to a two-way valve 30 when taking an oil sample, and the fourth pipeline 20 is used to connect to the two-way valve 30 when taking a gas sample.

[0035] As Figure 2 shown, Figure 2 It is a schematic diagram of the rear structure of the device of the present invention. At the rear of the control box 26, there are a first vacuum pump inlet pipeline 9, a second vacuum pump outlet pipeline 13, a waste liquid tank pipeline 18, a transformer oil sample pipeline 19, and a transformer gas sample pipeline 22. Among them, one end of the waste liquid tank pipeline 18 is connected to the waste liquid tank 4, and the other end of the waste liquid tank pipeline 18 is respectively connected to the third pipeline 16 and the transformer oil sample pipeline 19 through a third electric three-way valve 17; the transformer oil sample pipeline 19 has an interface for connecting to the transformer oil sampling port, the transformer gas sample pipeline 22 has an interface for connecting to the transformer gas collection box, and the transformer gas sample pipeline 22 is connected to the fourth pipeline 20 through an electric two-way valve 21; The vacuum pump inlet pipeline 9 and the vacuum pump outlet pipeline 13 have interfaces communicating with the atmosphere, and the other ends of the vacuum pump inlet pipeline 9 and the vacuum pump outlet pipeline 13 are connected to the vacuum pump 1.

[0036] As Figure 3 shown, Figure 3It is a schematic diagram of the sampling bag in the device of the present invention. In the present invention, the bag body of the sampling bag 3 itself and the two-way valve 30 are constituted. The bag body of the sampling bag 3 itself and the two-way valve 30 are of an integrated structure. When taking an oil sample, the two-way valve 30 is connected to the third pipeline 16. When taking a gas sample, the two-way valve 30 is connected to the fourth pipeline 20. The sampling bag 3 is made of oil-resistant plastic material. During use, it is directly placed vertically in the middle of the sampling bag bracket 28. Due to the limited middle spacing of the sampling bag bracket 28, the sampling bag 3 can be prevented from tipping over. The upper part of the sampling bag is designed with a slope to assist in discharging air bubbles in the oil. A two-dimensional code is provided on the surface of the sampling bag to store sampling information and sample information. The sampling information includes: sampling method, such as transformer oil or gas; the sample information includes: unit, equipment name, model, sampling date, sampling location, sampling weather, operating load, oil grade, and sampling volume, etc.

[0037] Embodiment 2

[0038] The present invention provides an embodiment, which is an automatic sampling device for transformer oil and gas. An automatic sampling device for transformer oil and gas as described in Embodiment 1 is used for automatically taking transformer oil samples. As Figure 4 shown, Figure 4 It is a schematic diagram of the present invention for automatically taking transformer oil samples.

[0039] Before taking an oil sample, connect the transformer oil sample pipeline 19 of this device to the transformer oil sampling valve.

[0040] The electric double-pass valve 21 of the present invention is in a closed state, and the air pressure in the sampling sealed box 2 can be adjusted by the vacuum pump 1. The adjustment method for realizing the negative pressure state of the sampling sealed box 2: The first electric three-way valve 8 acts to make the first vacuum pump intake pipeline 9 in a closed state, and the sampling chamber outlet pipeline 7 and the first pipeline 10 in an open state; the second electric three-way valve 12 acts to make the sampling chamber intake pipeline 11 in a closed state, and the second vacuum pump outlet pipeline 13 and the second pipeline 14 in an open state; the vacuum pump 1 acts, and the gas in the sampling sealed box 2 is discharged through the sampling chamber outlet pipeline 7, the first electric three-way valve 8, the first pipeline 10, the vacuum pump 1, the second pipeline 14, the second electric three-way valve 12, and the second vacuum pump outlet pipeline 13, so that the air pressure in the sampling sealed box 2 drops and becomes a negative pressure state. The adjustment method for realizing the positive pressure state of the sampling sealed box 2: The first electric three-way valve 8 acts to make the sampling chamber outlet pipeline 7 in a closed state, and the first vacuum pump intake pipeline 9 and the first pipeline 10 in an open state; the electric three-way valve 12 acts to make the second vacuum pump outlet pipeline 13 in a closed state, and the second pipeline 14 and the sampling chamber intake pipeline 11 in an open state; the vacuum pump 1 acts, and air enters the sampling sealed box 2 through the first vacuum pump intake pipeline 9, the first electric three-way valve 8, the first pipeline 10, the vacuum pump 1, the second pipeline 14, the second electric three-way valve 12, and the sampling chamber intake pipeline 11, so that the air pressure in the sampling sealed box 2 rises and becomes a positive pressure state.

[0041] Before sampling, the sampling bag 3 is vertically placed in the sampling bag bracket 28 in the sampling sealed box 2, the double-pass valve 30 is in an open state, the transformer oil sample pipeline 19 is connected to the transformer oil sampling port, the third electric three-way valve 17 makes the third pipeline 16 in a closed state, the waste liquid tank pipeline 18 is in a conducting state with the transformer oil sample pipeline 19, and the double-pass valve 15 is in a conducting state. After opening the transformer oil sampling port and starting automatic sampling, the transformer oil sample flows into the waste liquid tank 4 under the action of gravity through the transformer oil sample pipeline 19, the third electric three-way valve 17, and the waste liquid tank pipeline 18. At the same time, the bubble sensor 6 starts to work to detect the bubble state in the waste liquid tank pipeline 18 in real time. When the bubble sensor 6 does not detect bubbles, it proves that the pipeline has been rinsed and the gas in the pipeline has been discharged.

[0042] Rinsing of the sampling bag 3: When the bubble sensor 6 does not detect bubbles, the third electric three-way valve 17 acts to close the waste liquid tank pipeline 18, and the transformer oil sample pipeline 19 and the third pipeline 16 are in an open state; the vacuum pump 1 acts to make the sampling sealed box 2 in a negative pressure state; the transformer oil enters the sampling bag 3 through the transformer oil sample pipeline 19, the third electric three-way valve 17, the third pipeline 16, the flowmeter 5, and the double-pass valve 30. At the same time, the flowmeter 5 calculates the volume of the transformer oil flowing through. V 1; The third electric three-way valve 17 operates, closing the transformer oil sample pipeline 19 and opening the third pipeline 16 and the waste liquid tank pipeline 18; The sampling sealed box 2 becomes in a positive pressure state; The transformer oil in the sampling bag 3 is extruded under the positive pressure, flowing reversely through the flowmeter 5, and entering the waste liquid tank 4 through the third pipeline 16, the third electric three-way valve 17, the waste liquid tank pipeline 18, and the two-way valve 15. At the same time, the flowmeter 5 calculates the volume of the flowing transformer oil. V 2 ; The volume of the transformer oil to flow through V 1 is equal to the volume of the flowing transformer oil V 2 ; When they are equal, one rinsing of the sampling bag 3 is completed. The rinsing process needs to be repeated 2 - 3 times.

[0043] The formal sampling process of the transformer oil: The third electric three-way valve 17 operates to close the waste liquid tank pipeline 18, and the transformer oil sample pipeline 19 and the third pipeline 16 are in an open state; The vacuum pump 1 operates, making the sampling sealed box 2 in a negative pressure state; The transformer oil enters the sampling bag 3 through the transformer oil sample pipeline 19, the third electric three-way valve 17, the third pipeline 16, the flowmeter 5, and the two-way valve 30. At the same time, the flowmeter 5 calculates the volume of the flowing transformer oil. V 3 ; Wait until V 3 [[ID=1⑧]] After meeting the sampling requirements, the third electric three-way valve 17 operates to close the third pipeline 16; The vacuum pump 1 is turned off, the first electric three-way valve 8 operates to close the first pipeline 10, the sampling chamber outlet pipeline 7 and the first vacuum pump inlet pipeline 9 are in an open state, the pressure of the sampling sealed box 2 returns to the atmospheric pressure, the lid 27 of the sampling sealed box 2 is opened, the two-way valve 30 is closed, and the sampling bag 3 is taken out.

[0044] Embodiment 3

[0045] The present invention further provides an embodiment, which is a transformer oil and gas automatic sampling device. Using the transformer oil and gas automatic sampling device described in Embodiment 1 to automatically sample the gas in the transformer gas relay. As Figure 5 shown, Figure 5 is a schematic diagram of the present invention for automatically sampling the gas in the transformer gas relay.

[0046] Before taking the gas sample, connect the transformer gas sample pipeline 22 of this device to the gas sampling plug of the transformer gas collecting box.

[0047] The actuation of the third electric three-way valve 17 causes the third pipeline 16 to be in a closed state, and the electric two-way valve 21 to be in an open state. The transformer gas sample pipeline 22 is connected to the transformer gas collection box; the vacuum pump 1 operates to make the sampling sealed box 2 in a negative pressure state; the gas from the transformer gas relay in the gas collection box automatically enters the sampling bag 3 through the transformer gas sample pipeline 22, the electric two-way valve 21, and the fourth pipeline 20; after the sampling time t meets the requirements, the electric two-way valve 21 is closed; the vacuum pump 1 is closed, the first electric three-way valve 8 operates to close the first pipeline 10, the sampling chamber outlet pipeline 7 and the first vacuum pump inlet pipeline 9 are in an open state, the pressure of the sampling sealed box 2 returns to the atmospheric pressure, the lid 27 of the sampling sealed box 2 is opened, the two-way valve 30 is closed, the sampling bag 3 is taken out, and the automatic sampling of the gas is completed.

[0048] Embodiment 4

[0049] The present invention further provides an embodiment, which is a method for automatically sampling transformer oil and gas. As Figure 6 shown, Figure 6 is a flow chart of a method for automatically sampling transformer oil and gas of the present invention, specifically a comprehensive digital management flow chart of the sampling, testing, and data analysis processes proposed by the present invention.

[0050] Figure 6 is a comprehensive digital management flow chart of the sampling, testing, and data analysis processes proposed by the present invention. It includes the following steps: Step 1. Determine the relevant information for sampling through the mobile phone APP, including the sampling method, equipment name, sampling time, sampling category, sampling volume, etc.; Step 2. Generate a QR code, print it out and paste it on the surface of the sampling bag 3; Step 3. At the sampling site, determine the equipment working mode by scanning the code and complete the sampling; Specifically, after arriving at the sampling site with the sample bag 3 and the automatic sampling device, use the code scanning module 25 to read the QR code on the surface of the sample bag 3, and the automatic sampling device automatically determines the equipment working mode according to the sampling method and the sample volume; after installing the sample bag 3 on the sampling bag bracket 28 of the sampling sealed box body 29, complete the sampling; Step 4. In the laboratory, test the content of the fault gas in the sample by scanning the code; After bringing the sample back to the laboratory, also scan the QR code on the surface of the sample bag 3 to determine the sample information and then test the content of the fault gas in the sample; Step 5. Automatically save the test results through the offline chromatograph detector and upload them to the cloud database.

[0051] The off-line chromatograph detector automatically saves the test results and uploads them to the cloud database, and at the same time binds the test results with the sample information in the QR code, which is convenient for subsequent data analysis.

[0052] Embodiment 5

[0053] Based on the same inventive concept, an embodiment of the present invention further provides a computer device, including a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor. When the processor executes the computer program, the steps of any one of the transformer oil and gas automatic sampling methods described in Embodiments 2-4 are implemented.

[0054] Embodiment 6

[0055] Based on the same inventive concept, an embodiment of the present invention further provides a computer storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of any one of the transformer oil and gas automatic sampling methods described in Embodiments 2-4 are implemented.

[0056] In the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. The terms "connection" and "fixation" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In the description of the present invention, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention.

[0058] In the description of this specification, the description of terms such as "one embodiment" and "some embodiments" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0059] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) that contain computer-usable program code.

[0060] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present invention. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0061] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device that implements the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0062] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: still can modify the specific implementation manners of the present invention or make equivalent replacements. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the protection scope of the claims of the present invention.

Claims

1. An automatic sampling device for transformer oil and gas, characterized in that: It includes a control box and a sampling and sealing box. The control box contains a display screen, a keyboard and a code scanning module, all of which are arranged at the front of the control box body; the sampling and sealing box includes a sampling and sealing box cover and a sampling and sealing box body. A sampling bag support is provided inside the sealing box body, and the sampling bag is placed on the sampling bag support. A two-way valve is provided at the top of the sampling bag; on one side wall of the control box connected to the sealing box, there are a sampling chamber outlet pipe, a sampling chamber inlet pipe, a third pipe and a fourth pipe; the third pipe and the fourth pipe are respectively connected to the two-way valve; at the rear of the control box, there are a first vacuum pump inlet pipe, a second vacuum pump outlet pipe, a waste liquid tank pipe, a transformer oil sample pipe and a transformer gas sample pipe; the waste liquid tank pipe is connected to the waste liquid tank, and the other end of the waste liquid tank pipe is respectively connected to the third pipe and the transformer oil sample pipe; the interface of the transformer oil sample pipe is connected to the transformer oil sampling port, and the interface of the transformer gas sample pipe is connected to the transformer gas collection box; the interfaces on the vacuum pump inlet pipe and the vacuum pump outlet pipe are respectively communicated with the atmosphere, and the other ends of the vacuum pump inlet pipe and the vacuum pump outlet pipe are connected to the vacuum pump.

2. The automatic sampling device for transformer oil and gas according to claim 1, characterized in that: The upper part of the sampling bag is a ramp structure, and a two-dimensional code for storing sampling information and sample information is provided on the surface of the sampling bag.

3. The automatic sampling device for transformer oil and gas according to claim 1, characterized in that: The bag body of the sampling bag and the two-way valve are an integrated structure. When taking an oil sample, the two-way valve is connected to the third pipe; when taking a gas sample, the two-way valve is connected to the fourth pipe; the sampling bag is made of oil-resistant plastic material.

4. An automatic sampling method for transformer oil and gas, characterized in that: It is realized by using any one of the transformer oil and gas automatic sampling devices described in claims 1-3, including the following steps: Step 1. Determine the sampling information through the mobile phone APP. Step 2. Generate a two-dimensional code, print it and paste it on the surface of the sampling bag. Step 3. At the sampling site, determine the device working mode by scanning the code and complete the sampling. Step 4. In the laboratory, test the content of fault gases in the sample by scanning the code. Step 5. Automatically save the test results through the offline chromatograph detector and upload them to the cloud database.

5. The device according to claim 4, characterized in that: The sampling information includes: sampling method and sample information, and the sampling method includes transformer oil sampling or gas sampling.

6. The device according to claim 5, characterized in that: The sample information includes: unit, equipment name, model, sampling date, sampling location, sampling weather, operating load, oil grade and sampling volume.

7. A method for automatically sampling transformer oil and gas according to claim 4, characterized in that: When taking a transformer oil sample: The adjustment method to make the inside of the sampling and sealing box in a negative pressure state is: Connect the transformer oil sample pipe to the transformer oil sampling valve, close the electric two-way valve, and adjust the vacuum pump to make the inside of the sampling and sealing box in a negative pressure state: Close the first vacuum pump inlet pipe, open the sampling chamber outlet pipe and the first pipe; the sampling chamber inlet pipe is closed, and the second vacuum pump outlet pipe and the second pipe are opened; the vacuum pump operates, and the gas inside the sampling and sealing box is discharged through the sampling chamber outlet pipe, the first electric three-way valve, the first pipe, the vacuum pump, the second pipe, the second electric three-way valve and the second vacuum pump outlet pipe, so that the air pressure inside the sampling and sealing box drops to a negative pressure state; The method for adjusting the positive pressure state of the sampling sealed box is as follows: the outlet pipeline of the sampling chamber is closed, and the inlet pipeline of the first vacuum pump and the first pipeline are opened; the outlet pipeline of the second vacuum pump is closed, and the second pipeline and the inlet pipeline of the sampling chamber are opened; the vacuum pumps operate, and air enters the sampling sealed box through the inlet pipeline of the first vacuum pump, the first electric three-way valve, the first pipeline, the vacuum pump, the second pipeline, the second electric three-way valve, and the inlet pipeline of the sampling chamber, so that the air pressure in the sampling sealed box rises to a positive pressure state; Before sampling, place the sampling bag vertically in the sampling bag bracket in the sampling sealed box, open the two-way valve, connect the transformer oil sample pipeline to the transformer oil sampling port, the third electric three-way valve closes the third pipeline, the waste liquid tank pipeline is connected to the transformer oil sample pipeline, the two-way valve is connected, open the transformer oil sampling port, and start automatic sampling. Then, the transformer oil sample flows into the waste liquid tank through the transformer oil sample pipeline, the third electric three-way valve, and the waste liquid tank pipeline. At the same time, the bubble sensor is turned on to detect the bubble state in the waste liquid tank pipeline in real time. When the bubble sensor does not detect bubbles, the pipeline is rinsed and the gas in the pipeline has been discharged; Rinsing of the sampling bag: When the bubble sensor does not detect bubbles, the third electric three-way valve operates to close the waste liquid tank pipeline, and the transformer oil sample pipeline and the third pipeline are opened; the vacuum pump operates to make the sampling sealed box in a negative pressure state; the transformer oil enters the sampling bag through the transformer oil sample pipeline, the third electric three-way valve, the third pipeline, the flowmeter, and the two-way valve; the third electric three-way valve operates to close the transformer oil sample pipeline, and the third pipeline and the waste liquid tank pipeline are opened; the sampling sealed box becomes in a positive pressure state; the transformer oil in the sampling bag is extruded under the positive pressure state, flows reversely through the flowmeter, and enters the waste liquid tank through the third pipeline, the third electric three-way valve, the waste liquid tank pipeline, and the two-way valve. When the volume of the flowing transformer oil is equal to the volume of the flowing transformer oil, one rinsing of the sampling bag is completed; Process of sampling transformer oil: The third electric three-way valve operates to close the waste liquid tank pipeline, and the transformer oil sample pipeline and the third pipeline are opened; the vacuum pump operates to make the inside of the sampling sealed box in a negative pressure state; the transformer oil enters the sampling bag through the transformer oil sample pipeline, the third electric three-way valve, the third pipeline, the flowmeter, and the two-way valve. At the same time, the flowmeter calculates the volume of the flowing transformer oil. After meeting the sampling requirements, the third electric three-way valve operates to close the third pipeline; the vacuum pump is turned off, the first electric three-way valve operates to close the first pipeline, the outlet pipeline of the sampling chamber and the inlet pipeline of the first vacuum pump are opened to restore the pressure of the sampling sealed box to the atmospheric pressure, open the lid of the sampling sealed box, close the two-way valve, and take out the sampling bag.

8. A method for automatically sampling transformer oil and gas according to claim 4, characterized in that: When taking the gas sample, connect the transformer gas sample pipeline to the gas sampling plug of the transformer gas collecting box; the third electric three-way valve operates to close the third pipeline, the electric two-way valve opens, and the vacuum pump operates to make the inside of the sampling sealed box in a negative pressure state; the gas in the gas collecting box automatically enters the sampling bag through the transformer gas sample pipeline, the electric two-way valve, and the fourth pipeline; after the sampling time meets the requirements, the electric two-way valve closes; the vacuum pump closes, the first electric three-way valve operates to close the first pipeline, the sampling chamber outlet pipeline and the first vacuum pump inlet pipeline open, the pressure of the sampling sealed box returns to the atmospheric pressure, open the box cover, close the two-way valve, take out the sampling bag, and complete the automatic gas sampling.

9. A computer device, comprising a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of a method for automatically sampling transformer oil and gas according to any one of claims 4-8.

10. A computer storage medium, characterized in that: The computer storage medium stores a computer program, and when the computer program is executed by the processor, it implements the steps of a method for automatically sampling transformer oil and gas according to any one of claims 4-8.

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