Integrated detection system for gas content and moisture content in insulating oil

Abstract

The utility model relates to the technical field of electric power detection, in particular to an integrated detection system for gas content and moisture content in insulating oil, which comprises a vacuum chamber, the top of the vacuum chamber is connected with an oil inlet through a first pipeline, the oil inlet is further connected with a second pipeline, and a second control valve is arranged on the second pipeline. The second control valve is connected with a trace moisture measuring chamber through a third pipeline, the trace moisture measuring chamber is connected to the bottom of a vacuum chamber through a fourth pipeline, the vacuum chamber is connected with a vacuum pump through a fifth pipeline, a pressure sensor is arranged on the vacuum chamber, and the top of the oil inlet is connected with a sampling mechanism through a sixth pipeline. According to the utility model, the integrated detection of the gas content and the moisture content of the insulating oil is innovatively realized, two key parameter determination modules are organically integrated, and compared with a traditional detection mode, the complex process of multi-parameter step-by-step detection is simplified, and the equipment purchase and maintenance cost is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of power testing technology, specifically an integrated testing system for the gas content and moisture content in insulating oil. Background Technology

[0002] Gas content refers to the volume percentage of dissolved gases in transformer oil. By detecting the gas concentration in the insulating oil, fault analysis and lifespan prediction can be performed on oil-immersed transformers. Additionally, the moisture content in the insulating oil is an important indicator, as it affects key performance characteristics such as insulation performance and dielectric loss. Regularly testing gas and moisture content can help identify latent faults early, optimize maintenance strategies, reduce unplanned downtime, and extend equipment lifespan.

[0003] Currently, the vacuum differential pressure method is widely used to determine the gas content in insulating oil. Existing technology follows the standard DL / T423-2009 (Vacuum Differential Pressure Method for Determining Gas Content in Insulating Oil), and the gas content is determined using existing equipment according to this standard. However, current technology lacks a structure capable of simultaneously measuring the moisture content in the oil. Operators typically use a syringe to collect a small sample from the drain port for micro-moisture analysis. This manual testing is not only inefficient but also yields significant errors. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide an integrated detection system for gas content and moisture content in insulating oil.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] An integrated detection system for gas and moisture content in insulating oil includes a vacuum chamber. The top of the vacuum chamber is connected to an oil inlet via a first pipe. The oil inlet is also connected to a second pipe. A second control valve is installed on the second pipe. The second control valve is connected to a trace moisture measuring chamber via a third pipe. The trace moisture measuring chamber is connected to the bottom of the vacuum chamber via a fourth pipe. The vacuum chamber is connected to a vacuum pump via a fifth pipe. A pressure sensor is installed on the vacuum chamber. The top of the oil inlet is connected to a sample injection mechanism via a sixth pipe.

[0007] The above structure integrates a structure for measuring gas content using the vacuum differential pressure method and a structure for measuring moisture content, which simplifies the measurement process and procedures for insulating oil and reduces equipment costs.

[0008] The first pipeline is equipped with a first control valve, the fourth pipeline is equipped with a fourth control valve, and the fifth pipeline is equipped with a third control valve, a seventh pipeline, and a vacuum solenoid valve in sequence.

[0009] The entire measurement process described above can be automatically controlled without human intervention, and can obtain two important parameters of insulating oil: gas content and water content.

[0010] Specifically, the first control valve, the second control valve, the third control valve, and the fourth control valve are all solenoid valves.

[0011] The second and seventh pipes are made of stainless steel, the third and fourth pipes are made of polytetrafluoroethylene (PTFE) pipes, the fifth pipe is made of stainless steel corrugated pipe, and the sixth pipe is made of rubber pipe. The use of stainless steel pipes allows for welding, thereby improving sealing.

[0012] The position of the trace moisture measuring chamber is lower than that of the vacuum chamber, which allows the oil in the vacuum chamber to flow into the trace moisture measuring chamber by gravity.

[0013] The bottom of the vacuum chamber is connected to an oil drain pipe and an oil drain valve. After the test or rinsing is completed, the oil flows out through the oil drain pipe and the oil drain valve.

[0014] A humidity sensor is installed in the trace moisture measurement chamber.

[0015] The beneficial effects achieved by this utility model are:

[0016] This invention innovatively achieves integrated detection of gas content and moisture content in insulating oil, organically combining the two key parameter measurement modules. Compared with traditional detection methods, it not only simplifies the complex process of multi-parameter step-by-step detection, but also effectively reduces equipment purchase and maintenance costs.

[0017] This invention adopts fully automated control technology. Operators only need to start the detection program, and the system can complete the gas content measurement and moisture content analysis within a single detection cycle and achieve simultaneous output of dual parameters. This innovative design significantly improves detection efficiency and eliminates human error, providing an efficient and reliable solution for the quality control of insulating oil in power systems. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] In the diagram: 1. Oil inlet; 2. Second control valve; 3. Vacuum chamber; 4. First control valve; 5. Trace moisture measurement chamber; 6. Vacuum solenoid valve; 7. Fourth control valve; 8. Vacuum pump; 9. Pressure sensor; 10. Fifth pipe; 11. Second pipe; 12. Third pipe; 13. Seventh pipe; 14. Third control valve; 15. Sample injection mechanism; 16. Sixth pipe; 17. Fourth pipe; 18. First pipe; 19. Oil drain pipe; 20. Oil drain valve. Detailed Implementation

[0021] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0022] Example:

[0023] like Figure 1 As shown, an integrated detection system for gas and moisture content in insulating oil includes a vacuum chamber 3. The top of the vacuum chamber 3 is connected to an oil inlet 1 via a first pipe 18. The oil inlet 1 is also connected to a second pipe 11. A second control valve 2 is installed on the second pipe 11. The second control valve 2 is connected to a trace moisture measuring chamber 5 via a third pipe 12. The trace moisture measuring chamber 5 is connected to the bottom of the vacuum chamber 3 via a fourth pipe 17. The vacuum chamber 3 is connected to a vacuum pump 8 via a fifth pipe 10. A pressure sensor 9 is installed on the vacuum chamber 3. The top of the oil inlet 1 is connected to a sample injection mechanism 15 via a sixth pipe 16.

[0024] Vacuum chamber 3 uses the vacuum pressure difference method to determine the gas content; the trace moisture measuring chamber 5 is equipped with a humidity sensor, which uses an existing structure and employs the resistance-capacitance method to determine the moisture content.

[0025] A first control valve 4 is installed on the first pipeline 18, a fourth control valve 7 is installed on the fourth pipeline 17, and a third control valve 14, a seventh pipeline 13, and a vacuum solenoid valve 6 are sequentially installed on the fifth pipeline 10. These multiple control valves are electrically connected to the control system, enabling automatic control of the entire measurement process without manual operation. Specifically, the first control valve 4, the second control valve 2, the third control valve 14, and the fourth control valve 7 are all solenoid valves.

[0026] The functions of the second control valve 2, the first control valve 4, the vacuum solenoid valve 6, and the third control valve 14 are to seal the vacuum chamber 3 after it is evacuated by the vacuum pump 8 (all ports connected to the vacuum chamber 3 are in a sealed and closed state to ensure the vacuum level).

[0027] The second pipe 11 and the seventh pipe 13 are made of stainless steel, the third pipe 12 and the fourth pipe 17 are made of polytetrafluoroethylene (PTFE) pipe, the fifth pipe 10 is made of stainless steel corrugated pipe, and the sixth pipe 16 is made of rubber pipe. The use of stainless steel pipes in some of these pipes is for ease of welding, and welding improves sealing.

[0028] The trace moisture measuring chamber 5 is positioned lower than the vacuum chamber 3, allowing the oil in the vacuum chamber 3 to flow into the trace moisture measuring chamber 5 by gravity. An oil drain port is located at the bottom of the trace moisture measuring chamber 5, and a solenoid valve controls the opening and closing of the drain port.

[0029] The bottom of the vacuum chamber 3 is connected to an oil drain pipe 19 and an oil drain valve 20. After the test or rinsing is completed, the oil flows out through the oil drain pipe 19 and the oil drain valve 20.

[0030] The sample introduction mechanism 15 can adopt the structure of existing technology, specifically the same structure as the sample introduction unit described in publication number CN118937650A, entitled "A System for Measuring Gas Content in Insulating Oil".

[0031] The working principle and operation process of this utility model are as follows:

[0032] Principle of gas content measurement in insulating oil:

[0033] 1. Close all solenoid valves, open vacuum solenoid valve 6 and third control valve 14, start vacuum pump 8, and evacuate vacuum chamber 3. Vacuum pump 8 and vacuum chamber 3 are connected through fifth pipe 10, vacuum solenoid valve 6, seventh pipe 13 and third control valve 14.

[0034] 2. When the pressure in vacuum chamber 3 drops below 100 Pa, all solenoid valves connected to vacuum chamber 3 are closed, vacuum pump 8 is de-energized, and pressure sensor 9 measures the pressure in vacuum chamber 3.

[0035] 3. Check whether there is a change in the pressure data read by pressure sensor 9 to determine whether vacuum chamber 3 is leaking. If there is no leakage, record the pressure value at this time.

[0036] 4. The negative pressure in the vacuum chamber 3 draws a certain amount of oil sample from the injection mechanism 15 through the sixth pipe 16. The injection volume is controlled by the injection mechanism 15.

[0037] 5. The pressure inside the vacuum chamber 3 is monitored in real time by pressure sensor 9;

[0038] 6. After the pressure inside vacuum chamber 3 stabilizes and remains unchanged, record the pressure value at this time;

[0039] 7. Based on the above pressure difference and oil sample volume, and combined with the standard formula (refer to DL / T423-2009 "Method for Determining Gas Content in Insulating Oil by Vacuum Pressure Difference Method" 5.3.5 (1)), calculate the gas content of the oil sample (the above calculation is automatically completed by the detection system).

[0040] Principle of determining trace moisture content in insulating oil:

[0041] Referring to DL / T423-2009 "Method for Determining Gas Content in Insulating Oil by Vacuum Pressure Difference Method", before measuring the gas content of insulating oil, the trace moisture content of the oil sample is measured first. If the trace moisture content is less than 20ug, the gas content of the oil sample is tested. If the trace moisture content is greater than 20ug, the instrument will repeat the measurement of the trace moisture content after the gas content of the oil sample is measured. The moisture content values ​​measured twice are substituted into the standard formula (refer to DL / T423-2009 "Method for Determining Gas Content in Insulating Oil by Vacuum Pressure Difference Method" 5.3.5 (2)) to calculate the final gas content value of insulating oil (the above calculation process is automatically completed by the detection system).

[0042] The specific measurement process is as follows:

[0043] 1. Close the first control valve 4, open the second control valve 2, and use the injection mechanism 15 to inject the insulating oil sample into the oil inlet 1;

[0044] 2. The oil sample enters the trace moisture measuring chamber 5 through the second pipe 11, the second control valve 2 and the third pipe 12. The humidity sensor in the trace moisture measuring chamber 5 detects the trace moisture in the oil sample.

[0045] 3. If the trace moisture content is less than 20ug, re-inject the sample and test the gas content of the oil sample.

[0046] 4. If the trace moisture content value is greater than 20ug, after the gas content of the oil sample is measured, the trace moisture measuring chamber 5 will first drain the oil sample measured last time (i.e., the oil sample with a trace moisture content value greater than 20ug) through the drain port, and then open the fourth control valve 7. The oil sample will enter the trace moisture measuring chamber 5 through the fourth pipe 17. The trace moisture content value of the oil sample will be measured again. The instrument will measure the trace moisture content value again. The moisture values ​​measured twice will be substituted into the standard formula (refer to DL / T423-2009 "Method for Determining Gas Content in Insulating Oil by Vacuum Pressure Difference Method" 5.3.5 (2)) to calculate the final gas content value of the insulating oil (the above calculation process is automatically completed by the detection system).

Claims

1. An integrated detection system for gas content and moisture content in insulating oil, characterized in that, The system includes a vacuum chamber (3), the top of which is connected to an oil inlet (1) via a first pipe (18), the oil inlet (1) is also connected to a second pipe (11), a second control valve (2) is installed on the second pipe (11), the second control valve (2) is connected to a trace moisture measuring chamber (5) via a third pipe (12), the trace moisture measuring chamber (5) is connected to the bottom of the vacuum chamber (3) via a fourth pipe (17), the vacuum chamber (3) is connected to a vacuum pump (8) via a fifth pipe (10), a pressure sensor (9) is installed on the vacuum chamber (3), and the top of the oil inlet (1) is connected to a sample injection mechanism (15) via a sixth pipe (16).

2. The integrated detection system for gas content and moisture content in insulating oil according to claim 1, characterized in that, The first control valve (4) is provided on the first pipe (18), the fourth control valve (7) is provided on the fourth pipe (17), and the third control valve (14), the seventh pipe (13) and the vacuum solenoid valve (6) are provided on the fifth pipe (10) in sequence.

3. The integrated detection system for gas content and moisture content in insulating oil according to claim 2, characterized in that, The first control valve (4), the second control valve (2), the third control valve (14) and the fourth control valve (7) are all solenoid valves.

4. The integrated detection system for gas content and moisture content in insulating oil according to claim 2, characterized in that, The second pipe (11) and the seventh pipe (13) are made of stainless steel pipe, the third pipe (12) and the fourth pipe (17) are made of polytetrafluoroethylene pipe, the fifth pipe (10) is made of stainless steel corrugated pipe, and the sixth pipe (16) is made of rubber pipe.

5. The integrated detection system for gas content and moisture content in insulating oil according to claim 1, characterized in that, The position of the trace moisture measuring chamber (5) is lower than that of the vacuum chamber (3).

6. The integrated detection system for gas content and moisture content in insulating oil according to claim 1, characterized in that, The bottom of the vacuum chamber (3) is connected to an oil drain pipe (19) and an oil drain valve (20).

7. The integrated detection system for gas content and moisture content in insulating oil according to claim 1, characterized in that, A humidity sensor is installed in the trace moisture measurement chamber (5).

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