Transformer insulating oil autonomous fully-sealed sampling device and test method thereof

Abstract

The invention belongs to the technical field of power system transformer insulating oil testing, and provides a transformer insulating oil autonomous fully-sealed sampling device and a testing method thereof. The sampling system comprises a detection module, a four-way control valve, a peristaltic pump, a sealed sampling module and an oil discharge pipe, and the inlet end of the detection module is connected with a sampling port pipeline of the transformer; four ports of the four-way control valve are respectively connected with the outlet end of the detection module, the inlet end of the peristaltic pump, the inlet end of the sealed sampling module and the inlet end of the oil discharge pipe through pipelines; the control system is connected with the detection module, the four-way control valve, the peristaltic pump and the sealed sampling module so as to control the sampling system to sample and monitor the state of oil in a pipeline of the sampling system in real time. The invention aims to solve the problems of poor experimental result accuracy caused by poor sealing performance of the existing insulating oil sampling system and low experimental efficiency caused by manual operation of the sampling system, and the experimental efficiency and the accuracy of the experimental result are effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer insulating oil testing in an electric power system, and specifically provides an autonomous fully sealed sampling device for transformer insulating oil and a testing method thereof. Background Art

[0002] The change in the content of dissolved gas components in transformer oil is an important indicator for judging whether the oil-filled equipment has failed. Since the content of dissolved gas components in transformer insulating oil is easily affected by sampling, there are many problems with the traditional transformer insulating oil sampling method, such as poor sealing performance, which easily leads to sample contamination and moisture, affecting the accuracy of the test results; the sampling operation process is complicated, requiring high skills of operators, resulting in low sampling efficiency; lack of autonomy, it is difficult to adapt to the development needs of modern power system intelligence and automation.

[0003] Therefore, there is an urgent need for an autonomous fully sealed sampling device for transformer insulating oil to improve the accuracy, efficiency and reliability of transformer insulating oil sampling. Summary of the invention

[0004] An object of the present invention is to provide an autonomous fully sealed sampling device for transformer insulating oil to improve the accuracy, efficiency and reliability of transformer insulating oil sampling.

[0005] To achieve the above object, the present invention provides an autonomous fully sealed sampling device for transformer insulating oil, comprising:

[0006] The sampling system comprises a detection module, a four-way control valve, a peristaltic pump, a sealed sampling module and an oil drain pipe, wherein the inlet end of the detection module is connected to the sampling port pipeline of the transformer; the four ports of the four-way control valve are respectively connected to the outlet end of the detection module, the inlet end of the peristaltic pump, the inlet end of the sealed sampling module and the inlet end of the oil drain pipe through pipelines;

[0007] A control system is connected with the detection module, the four-way control valve and the peristaltic pump to control the sampling system to take samples and monitor the state of the oil in the pipeline of the sampling system in real time.

[0008] Furthermore, the sealed sampling module includes a sampling box, a syringe and an elastic member, the syringe is installed in the sampling box, the injection port of the syringe is connected to a port pipeline of the four-way control valve, and the push rod of the syringe is connected to the elastic member; the elastic member is installed at an angle in the sampling box.

[0009] Furthermore, the sealed sampling module also includes a fixing seat, which is arranged at the bottom of the sampling box. The fixing seat is provided with a mounting groove, and the mounting groove is inclined as a whole. The elastic member can be fully or partially embedded in the mounting groove.

[0010] Furthermore, a positioning structure is provided on the fixing seat, and the syringe push rod can abut against the positioning structure to limit the tilt angle of the syringe.

[0011] Furthermore, the syringe forms an angle of 75° with the plane.

[0012] Further, the positioning structure is formed by extending the sampling box upward; or, the positioning structure is connected to the sampling box via a fastener.

[0013] Furthermore, the detection module includes a pressure sensor, a temperature sensor and a flow sensor connected through a pipeline; the pressure sensor is used to detect the pressure value of the insulating oil in the pipeline of the sampling system; the temperature sensor is used to detect the temperature value of the insulating oil in the pipeline of the sampling system; the flow sensor is used to detect the flow value of the insulating oil in the pipeline of the sampling system.

[0014] Further, the control system is configured to be able to control the four-way control valve to open / close any one or more openings; and / or, the sampling device also includes an operation module, which is electrically connected to the control system; the operation module includes a sampling button, a cleaning button and a valve control button, and the sampling button is configured to control the sampling system to start sampling by clicking the sampling button; the cleaning button is configured to control the sampling system to clean the sealed sampling module and each pipeline by clicking the cleaning button; the valve control button includes four control buttons, and the four control buttons correspond to the four openings of the four-way control valve respectively, and the four control buttons are configured to control the opening / closing of the opening corresponding to the four-way control valve by clicking any one or more of the control buttons.

[0015] Furthermore, the control system is configured to generate a change trend graph based on the parameter values ​​detected by the detection module; the sampling device also includes a display module, which is connected to the control system and is used to display the parameter values ​​of the detection module and the change trend graph of each parameter.

[0016] In another embodiment, a test method for an autonomous fully sealed sampling device for transformer insulating oil is provided, comprising the autonomous fully sealed sampling device for transformer insulating oil as described in any one of the above items; the sampling device comprises a sampling system and a control system; the test method comprises: a preparation stage: connecting the sampling system to the transformer through a pipeline, and turning on the power supply, adjusting the temperature of the sampling box to the target temperature, and controlling the sampling box to preheat for a period of time, after the sampling system state is stable, the display module enters the initial page, and inputs the preset parameters of the sampling, the preset parameters including flow rate, temperature, pressure, number of cleanings, etc. , sampling oil volume and dead oil volume; drain the dead oil in the transformer pipeline: open the sampling valve of the transformer, control the four-way control valve to open the opening connecting the transformer and the oil drain pipeline, so as to drain the dead oil in the oil outlet pipeline of the transformer, and when the discharged dead oil volume reaches the preset dead oil volume, control the four-way control valve to close the opening connected to the oil drain pipeline; clean the sealed sampling module: click the cleaning button, control the four-way control valve to open the opening connecting the transformer and the sealed sampling module, so as to inject oil into the sealed sampling module, and then control the four-way control valve to open the opening connected to the creeping oil pump. The opening connected to the peristaltic pump is controlled to start running to discharge the oil in the sealed sampling module to clean the sealed sampling module. The cleaning is repeated until the cleaning times are reached, and then the four-way control valve is controlled to close the opening connected to the peristaltic pump; Sampling: Click the sampling button to control the four-way control valve to open the opening connecting the transformer and the sealed sampling module, so that the insulating oil enters the syringe. When the amount of insulating oil in the syringe reaches the preset sampling oil amount, the four-way control valve is controlled to close the opening connected to the transformer. At the same time, the four-way control valve is controlled to open Open the opening connected to the peristaltic pump to discharge the bubbles in the syringe. After the bubbles in the syringe are discharged, control the peristaltic pump to stop running, control the four-way control valve to close the opening, stop sampling, take out the syringe and quickly seal it with a rubber cap, place it in a storage box, mark and record it, and repeat the sampling multiple times; after all sampling is completed, start the peristaltic pump and open all openings of the four-way control valve, discharge the remaining insulating oil in the pipeline, and use cleaning fluid to flush the entire sampling system. After the sampling system is dry, disassemble the sampling system and the sampling is completed.

[0017] Based on the foregoing description, those skilled in the art will understand that, in the aforementioned technical solution of the present invention, by integrating the sampling system with the control system to improve the degree of automation of the sampling system, the sampling system is directly controlled by the control system to perform sampling tests, and the state of the oil in the pipeline during the sampling process is monitored in real time, so that sudden conditions occurring in the oil during the sampling process can be discovered in time, effectively improving the efficiency of sampling and the accuracy of the experimental results; at the same time, the sampling module is configured as a sealing structure to avoid the problem of inaccurate experimental results caused by contamination of the insulating oil during the experiment, thereby further improving the accuracy of the experimental results. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the present invention, some embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that the same reference numerals indicate the same or similar components or parts in different drawings; the drawings of the present invention are not necessarily drawn to scale.

[0019] In the attached figure:

[0020] Figure 1 Schematic diagram of the structure of the sampling device in some embodiments of the present invention.

[0021] Description of reference numerals:

[0022] 1. Transformer;

[0023] 2. Sampling system; 21. Pressure sensor; 22. Temperature sensor; 23. Flow sensor; 24. Four-way control valve; 25. Peristaltic pump; 26. Oil discharge pipeline; 27. Sampling box; 28. Syringe; 29. ​​Elastic part. DETAILED DESCRIPTION

[0024] It should be understood by those skilled in the art that the embodiments described below are only some embodiments of the present invention, rather than all embodiments of the present invention, and these embodiments are intended to explain the technical principles of the present invention, rather than to limit the protection scope of the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should still fall within the protection scope of the present invention.

[0025] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "top", "bottom", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0026] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Refer to the following Figure 1 , to describe in detail the sampling device in some embodiments of the present invention. Among them, Figure 1 Schematic diagram of the structure of the sampling device in some embodiments of the present invention.

[0028] It should be noted that, for the convenience of description and to enable those skilled in the art to quickly understand the technical solution of the present invention, the following text only describes the technical features that are strongly related (directly or indirectly related) to the technical problem and / or technical concept to be solved by the present invention, and will not describe the technical features that are weakly related to the technical problem and / or technical concept to be solved by the invention. Since the technical features with a weaker degree of correlation belong to the common knowledge in the field, even if the present invention does not describe the features with a weaker degree of correlation, it will not lead to insufficient disclosure of the present invention.

[0029] like Figure 1As shown, in some embodiments of the present invention, an autonomous fully sealed sampling device for insulating oil of a transformer 1 is provided, comprising a sampling system 2 and a control system. The sampling system 2 comprises a detection module, a four-way control valve 24, a peristaltic pump 25, a sealed sampling module and an oil drain pipe. The inlet end of the detection module is connected to the sampling port pipeline of the transformer 1; the four ports of the four-way control valve 24 are respectively connected to the outlet end of the detection module, the inlet end of the peristaltic pump 25, the inlet end of the sealed sampling module and the inlet end of the oil drain pipe through pipelines. The control system is electrically connected to the detection module, the four-way control valve 24 and the peristaltic pump 25 to control the sampling system 2 to perform sampling and monitor the state of the oil in the pipeline of the sampling system 2 in real time. The state of the oil includes parameters such as temperature, flow rate and pressure.

[0030] Specifically, the control system is configured to control the four-way control valve 24 to open any one or more of the four ports or to control the four-way control valve 24 to close any one or more of the four ports. The control system is also configured to control the peristaltic pump 25 to run or stop running.

[0031] The four-way control valve 24 may be configured as a solenoid valve or a switching valve that controls the opening / closing of the valve through a connecting rod principle.

[0032] The sealed sampling module includes a sampling box 27, a syringe 28 and an elastic member 29. The syringe 28 is installed in the sampling box 27. The injection port of the syringe 28 is connected to a port pipeline of the four-way control valve 24. The push rod of the syringe 28 is connected to the elastic member 29, so that the syringe 28 applies a force to the elastic member 29 during the sampling process, so that the elastic member 29 drives the syringe 28 to vibrate, effectively eliminating the bubbles in the syringe 28. The elastic member 29 is installed obliquely in the sampling box 27, so that the syringe 28 is tilted as a whole, which further plays a role in eliminating bubbles.

[0033] The sampling box 27 is configured as a thermostatic box, and the sampling box 27 is electrically connected to the control system, that is, the control system can control the sampling box 27 to adjust the temperature inside to the experimental temperature. Before each experiment, the thermostatic box can be cleaned to avoid contamination of the insulating oil.

[0034] Those skilled in the art can set the inclination angle between the syringe 28 and the working platform as needed. In some specific embodiments, the inclination angle between the syringe 28 and the working platform can be set to 60°, 65°, 70°, 75°, 80° or 85°. In some more specific embodiments, the inclination angle between the syringe 28 and the working platform is 75°.

[0035] The elastic member 29 can be configured as a spring, a leaf spring or a disc spring. Preferably, in the present invention, the elastic member 29 is configured as a cylindrical spring.

[0036] The sealed sampling module also includes a fixed seat, which is arranged at the bottom of the sampling box 27. The fixed seat is provided with a mounting groove, and the mounting groove is inclined as a whole. The elastic member 29 can be fully or partially embedded in the mounting groove and one end thereof can be fixed to the bottom of the mounting groove, so that the elastic member 29 can maintain an inclined state and be stably in the sampling box 27.

[0037] In other embodiments of the present invention, a positioning structure is provided on the fixing seat, and the push rod of the syringe 28 can abut against the positioning structure to limit the tilt angle of the syringe 28.

[0038] The positioning structure is formed by extending the sampling box 27 upward; or, the positioning structure is connected to the sampling box 27 by a fastener. The fastener can be a screw or a bolt. In order to meet the experimental requirements, the operator can adjust the position of the positioning structure according to actual needs to adjust the tilt angle of the syringe 28.

[0039] In some other embodiments of the present invention, a clamping frame is provided in the sampling box 27, one end of the clamping frame is connected to the side wall of the sampling box 27, and the other end of the clamping frame is used to clamp the syringe 28 to limit the inclination angle of the syringe 28. The clamping frame is provided with an adjustment knob, and the adjustment knob is tightened to clamp the clamping end of the clamping frame and the syringe 28, and the adjustment knob is loosened to release the syringe 28 by the clamping end of the clamping frame.

[0040] The detection module includes a pressure sensor 21, a temperature sensor 22 and a flow sensor 23 connected by a pipeline. The pressure sensor 21 is used to detect the pressure value of the insulating oil in the pipeline of the sampling system 2, the temperature sensor 22 is used to detect the temperature value of the insulating oil in the pipeline of the sampling system 2, and the flow sensor 23 is used to detect the flow value of the insulating oil in the pipeline of the sampling system 2.

[0041] The sampling system 2 also includes a display module, which is electrically connected to the control system. The display module is used to display the state of the oil in the sampling system 2 and the parameters of each component of the sampling system 2 during the experiment.

[0042] The control system is also configured to generate a change trend graph based on the parameter values ​​detected by the detection module, and the display module is also used to display the parameter values ​​of the detection module and the change trend graph of each parameter.

[0043] The sampling system 2 also includes an operation module, which is electrically connected to the control system, and the operation module is used to enable the operator to interact with the control system. Among them, the operation module can be set as a touch screen, a remote control, a keyboard or other human-computer interaction tools combined with the display module. Specifically, the sampling device also includes an operation module, which is electrically connected to the control system; the operation module includes a sampling button, a cleaning button and a valve control button, and the sampling button is configured to control the sampling system to start sampling by clicking the sampling button. The cleaning button is configured to control the sampling system to clean the sealed sampling module and each pipeline by clicking the cleaning button. The valve control button includes four control buttons, and the four control buttons correspond to the four openings of the four-way control valve respectively. The four control buttons are configured to control the opening / closing of the opening corresponding to the four-way control valve by clicking any one or more control buttons.

[0044] In other embodiments of the present invention, a test method for an autonomous fully sealed sampling device for insulating oil of transformer 1 is provided, including the autonomous fully sealed sampling device for insulating oil of transformer 1 described in any one of the above items; the test method includes:

[0045] Preparation stage: connect the sampling system 2 to the transformer 1 through a pipeline, turn on the power, adjust the temperature of the sampling box 27 to the target temperature, and control the sampling box 27 to preheat for a period of time. After the sampling system 2 is in a stable state, the display module enters the initial page and inputs the preset parameters for sampling. The preset parameters include flow rate, temperature, pressure, number of cleanings, sampling oil volume, and dead oil volume. Specifically, open the sealing cover of the sampling port of the transformer 1, tightly connect the sampling pipe of the sampling system 2 to the sampling port of the transformer 1, and ensure that the connection is stable and leak-free. Turn on the power, control the sealed sampling module to preheat for 3 minutes, and after the sealed sampling module is in a stable state, the display module enters the initial page and inputs the preset parameters for sampling.

[0046] Drain the dead oil in the pipeline of transformer 1: open the sampling valve of transformer 1, control the four-way control valve 24 to open the opening connecting transformer 1 and the oil drain pipeline 26, so as to discharge the dead oil in the oil outlet pipeline of transformer 1; when the dead oil volume discharged reaches the preset dead oil volume, control the four-way control valve 24 to close the opening connected to the oil drain pipeline 26.

[0047] Cleaning the sealed sampling module: click the cleaning button to control the four-way control valve 24 to open the opening connecting the transformer 1 and the sealed sampling module to inject oil into the sealed sampling module, and then control the four-way control valve 24 to open the opening connected to the peristaltic pump 25, and control the peristaltic pump 25 to start running to discharge the oil in the sealed sampling module to clean the sealed sampling module. Repeat the cleaning until the cleaning times are reached, and then control the four-way control valve 24 to close the opening connected to the peristaltic pump 25.

[0048] Sampling: Click the sampling button to control the four-way control valve 24 to open the opening connecting the transformer 1 and the sealed sampling module, so that the insulating oil enters the syringe 28. When the amount of insulating oil in the syringe 28 reaches the preset sampling oil amount, the four-way control valve 24 is controlled to close the opening connected to the transformer 1. At the same time, the four-way control valve 24 is controlled to open the opening connected to the peristaltic pump 25 to discharge the bubbles in the syringe 28. After the bubbles in the syringe 28 are discharged, the peristaltic pump 25 is controlled to stop running, and the four-way control valve 24 is controlled to close the opening, stop sampling, take out the syringe 28 and quickly seal it with a rubber cap, place it in a storage box, mark and record it, and repeat the sampling multiple times.

[0049] After all sampling is completed, start the peristaltic pump 25 and open all openings of the four-way control valve 24 to discharge the remaining insulating oil in the pipeline, and use cleaning liquid to flush the entire sampling system 2. After the sampling system 2 is dry, disassemble the sampling system 2 and the sampling is completed.

[0050] Those skilled in the art will appreciate that the present invention improves the degree of automation of the sampling system 2 by integrating the sampling system 2 with the control system, directly controls the sampling system 2 to perform sampling tests through the control system, and monitors the state of the oil in the pipeline during the sampling process in real time, thereby being able to promptly detect any unexpected conditions that may occur during the sampling process, and effectively improving the efficiency of sampling and the accuracy of the experimental results; at the same time, the sampling module is configured as a sealed structure to avoid the problem of inaccurate experimental results caused by contamination of the insulating oil during the experiment, thereby further improving the accuracy of the experimental results.

[0051] So far, the technical solution of the present invention has been described in combination with the above multiple embodiments, but it is easy for those skilled in the art to understand that the protection scope of the present invention is not limited to these specific embodiments. Without departing from the technical principles of the present invention, those skilled in the art can split and combine the technical solutions in the above embodiments, and can also make equivalent changes or replacements to the relevant technical features. Any changes, equivalent replacements, improvements, etc. made within the technical concept and / or technical principles of the present invention will fall within the protection scope of the present invention.

Claims

1. An autonomous fully sealed sampling device for transformer insulating oil, characterized in that: include: The sampling system includes a detection module, a four-way control valve, a peristaltic pump, a sealed sampling module and an oil drain pipe, wherein the inlet end of the detection module is connected to the sampling port pipeline of the transformer; the four ports of the four-way control valve are respectively connected to the outlet end of the detection module, the inlet end of the peristaltic pump, the inlet end of the sealed sampling module and the inlet end of the oil drain pipe through pipelines; A control system is connected with the detection module, the four-way control valve, the peristaltic pump and the sealed sampling module to control the sampling system to take samples and monitor the state of the oil in the pipeline of the sampling system in real time.

2. The transformer insulating oil autonomous fully sealed sampling device according to claim 1 is characterized in that: The sealed sampling module includes a sampling box, a syringe and an elastic member. The sampling box is configured as a constant temperature box and is connected to the control system. The syringe is installed in the sampling box, the injection port of the syringe is connected to a port pipeline of the four-way control valve, and the push rod of the syringe is connected to the elastic member. The elastic member is installed in the sampling box at an angle.

3. The transformer insulating oil autonomous fully sealed sampling device according to claim 2 is characterized in that: The sealed sampling module also includes a fixing seat, which is arranged at the bottom of the sampling box. The fixing seat is provided with a mounting groove, and the mounting groove is inclined as a whole. The elastic member can be fully or partially embedded in the mounting groove.

4. The transformer insulating oil autonomous fully sealed sampling device according to claim 3 is characterized in that: The fixing seat is provided with a positioning structure, and the syringe push rod can abut against the positioning structure to limit the tilt angle of the syringe.

5. The transformer insulating oil autonomous fully sealed sampling device according to claim 4 is characterized in that: The inclination angle between the syringe and the working platform is 75°.

6. The transformer insulating oil autonomous fully sealed sampling device according to claim 4, characterized in that: The positioning structure is formed by extending the sampling box upward; or, The positioning structure is connected to the sampling box via fasteners.

7. The transformer insulating oil autonomous fully sealed sampling device according to claim 1 is characterized in that: The detection module includes a pressure sensor, a temperature sensor and a flow sensor connected by a pipeline; The pressure sensor is used to detect the pressure value of the insulating oil in the sampling system pipeline; The temperature sensor is used to detect the temperature value of the insulating oil in the sampling system pipeline; The flow sensor is used to detect the flow value of the insulating oil in the sampling system pipeline.

8. The transformer insulating oil autonomous fully sealed sampling device according to claim 1, characterized in that: The control system is configured to control the four-way control valve to open / close any one or more openings; and / or, The sampling device also includes an operation module, which is electrically connected to the control system; the operation module includes a sampling button, a cleaning button and a valve control button, and the sampling button is configured so that clicking the sampling button can control the sampling system to start sampling; the cleaning button is configured so that clicking the cleaning button can control the sampling system to clean the sealed sampling module and each pipeline; the valve control button includes four control buttons, and the four control buttons correspond to the four openings of the four-way control valve respectively, and the four control buttons are configured so that clicking any one or more of the control buttons can control the opening / closing of the opening corresponding to the four-way control valve.

9. The transformer insulating oil autonomous fully sealed sampling device according to claim 1, characterized in that: The control system is configured to generate a change trend graph according to the parameter value detected by the detection module; The sampling device also includes a display module, which is connected to the control system and is used to display the state of the oil during the sampling process, the parameter value of the detection module and a change trend diagram of each parameter.

10. A test method for an autonomous fully sealed sampling device for transformer insulating oil, characterized in that: The invention comprises the autonomous fully sealed sampling device for transformer insulating oil as claimed in any one of claims 1 to 9; the sampling device comprises a sampling system and a control system; the test method comprises: Preparation stage: connect the sampling system to the transformer through a pipeline, turn on the power, adjust the temperature of the sampling box to the target temperature, and control the sampling box to preheat for a period of time. After the sampling system is stable, the display module enters the initial page and inputs the preset parameters of sampling, which include flow rate, temperature, pressure, number of cleaning times, sampling oil volume and dead oil volume; Drain the dead oil in the transformer pipeline: open the sampling valve of the transformer, control the four-way control valve to open the opening connecting the transformer and the oil drain pipeline, so as to drain the dead oil in the transformer oil outlet pipeline, and when the dead oil volume reaches a preset dead oil volume, control the four-way control valve to close the opening connected to the oil drain pipeline; Cleaning the sealed sampling module: click the cleaning button to control the four-way control valve to open the opening connecting the transformer and the sealed sampling module to inject oil into the sealed sampling module, then control the four-way control valve to open the opening connected to the peristaltic pump, control the peristaltic pump to start running, so as to discharge the oil in the sealed sampling module to clean the sealed sampling module, repeat the cleaning until the cleaning times are reached, and then control the four-way control valve to close the opening connected to the peristaltic pump; Sampling: Click the sampling button to control the four-way control valve to open the opening connecting the transformer and the sealed sampling module, so that the insulating oil enters the syringe. When the amount of insulating oil in the syringe reaches the preset sampling oil amount, control the four-way control valve to close the opening connected to the transformer. At the same time, control the four-way control valve to open the opening connected to the peristaltic pump to discharge the bubbles in the syringe. After the bubbles in the syringe are discharged, control the peristaltic pump to stop running, control the four-way control valve to close the opening, stop sampling, take out the syringe and quickly seal it with a rubber cap, place it in a storage box, mark and record it, and repeat sampling multiple times; After all sampling is completed, start the peristaltic pump and open all openings of the four-way control valve to drain the remaining insulating oil in the pipeline, and use cleaning fluid to flush the entire sampling system. After the sampling system is dry, disassemble the sampling system and the sampling is completed.

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