An improved on-line monitoring system for transformer insulating oil

Abstract

The present invention relates to the technical field of transformer insulating oil monitoring, and particularly to an improved on-line monitoring system for transformer insulating oil. The detection system includes: a detection chamber for containing the transformer insulating oil to be detected, in which several sensor acquisition modules are arranged; a breathable, waterproof and pressure-reducing device is arranged at the top of the detection chamber; a screen window structure is arranged in the detection chamber; a heating device is arranged on the outer wall of the detection chamber; a sampling pipeline for transporting the transformer insulating oil to be detected to the detection chamber; a circulation pipeline for circulating the transformer insulating oil in the detection chamber; a data processing module for processing the data collected by the sensor acquisition modules; an oil discharge pipeline for discharging the detected transformer insulating oil, on which a filter is arranged for filtering impurities; and a housing for avoiding interference from the external environment. The present invention can improve the accuracy of monitoring the transformer insulating oil and reduce the loss of insulating oil caused by frequent detection of the transformer insulating oil.

Description

Technical Field

[0001] The invention relates to the technical field of transformer insulating oil monitoring, in particular to an improved transformer insulating oil online monitoring system. Background Art

[0002] Existing online transformer oil monitoring systems typically only monitor a few parameters of the transformer oil and are unable to monitor multiple parameters online. Furthermore, users are increasingly demanding higher frequencies for transformer oil testing, leading to a need to recycle the tested oil back to the transformer. However, various contaminants may appear during the testing process, and directly recycling the tested oil back to the transformer will contaminate the oil. Furthermore, due to the significant difference in surface tension between the normal transformer oil molecules and the polar molecules of its oxidation products, they are difficult to mix, leading to uneven distribution of polar molecules at different locations in the transformer oil being tested. This results in significant fluctuations in the data measured by existing online monitoring systems, reducing the accuracy of transformer oil testing. Improving the reliability and accuracy of transformer oil monitoring and reducing oil loss caused by high-frequency testing are pressing issues. Summary of the Invention

[0003] The present invention aims to provide an improved transformer insulating oil online monitoring system to improve the reliability and accuracy of transformer insulating oil monitoring and reduce the insulating oil loss caused by high-frequency detection of transformer insulating oil.

[0004] According to the present invention, an improved transformer insulating oil online monitoring system is provided, the monitoring system comprising:

[0005] A detection chamber (100) is provided for containing transformer insulating oil to be detected, wherein a plurality of sensor acquisition modules are provided in the detection chamber (100), and different sensor acquisition modules are used to acquire different parameters of the transformer insulating oil to be detected; a breathable and waterproof pressure-reducing device (101) is provided on the top of the detection chamber (100); a screen-type structure is provided in the detection chamber (100), and the screen-type structure is used to uniformly distribute polar molecules in the transformer insulating oil to be detected; and a heating device is provided on the outer wall of the detection chamber (100), and the heating device is used to heat the transformer insulating oil in the detection chamber (100) so as to release dissolved gas from the transformer insulating oil.

[0006] A sampling pipeline (200) is used to transport transformer insulating oil to be tested to the testing chamber (100).

[0007] Circulation pipeline (300), the circulation pipeline (300) is used to circulate the transformer insulating oil in the detection chamber (100).

[0008] Data processing module (400), the data processing module (400) is used to process the data collected by the sensor acquisition module.

[0009] Oil discharge pipeline (700), the oil discharge pipeline (700) is used to discharge the detected transformer insulating oil. The first port of the oil discharge pipeline (700) is connected to the oil outlet of the first oil pump (701), and the second port of the oil discharge pipeline (700) is connected to the oil discharge port; A return oil pump (701), a third valve (702) and a plug-in filter (703) are arranged on the oil discharge pipeline (700). The third valve (702) is used to control the opening and closing of the oil discharge pipeline (700), and the plug-in filter (703) is used to filter impurities in the detected transformer insulating oil.

[0010] Shell, the shell is used to avoid interference from the external environment. The shell is a fully enclosed stainless steel shell. There are an openable front door and a rear door on the shell, and a spare plug-in filter is arranged on the inner wall of the shell.

[0011] The present invention has at least the following beneficial effects:

[0012] The monitoring system of the present invention can realize the on-line monitoring of the transformer insulating oil, which is beneficial to timely discover internal faults of the transformer and greatly reduce the transformer shutdown rate; and it can collect a variety of parameters of the transformer insulating oil to realize the comprehensive monitoring of the transformer insulating oil. In particular, a breathable, waterproof and pressure-reducing device is arranged at the top of the detection chamber in the monitoring system of the present invention. The breathable, waterproof and pressure-reducing device has the functions of breathable and pressure-reducing, and at the same time has the function of waterproof, which is beneficial to multiple sensor acquisition modules to accurately detect the transformer insulating oil at the same time; A plug-in filter is arranged on the oil discharge pipeline of the present invention, which can effectively filter impurities in the detected transformer insulating oil, which is beneficial to the reuse of the detected transformer insulating oil. The detected transformer insulating oil can be re-transported to the insulating oil of the transformer, which can reduce the loss of transformer insulating oil caused by high-frequency detection; A screen window structure is also arranged in the detection chamber of the present invention, which can make the distribution of polar molecules in the insulating oil to be detected uniform, which is beneficial to improving the detection accuracy of the transformer insulating oil; The present invention is also provided with a shell, which can avoid interference from rainwater and electromagnetic fields in the external environment, which is beneficial to improving the reliability and accuracy of the monitoring system of the present invention for monitoring the transformer insulating oil, and is also beneficial to improving the service life of the monitoring system. Description of the Drawings

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings required in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0014] Figure 1 It is a schematic diagram of an improved on-line monitoring system for transformer insulating oil provided by an embodiment of the present invention. Detailed implementation manners

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0016] According to the present invention, an improved on-line monitoring system for transformer insulating oil is provided, as Figure 1 shown, the monitoring system includes:

[0017] A detection chamber 100 for containing the transformer insulating oil to be detected. A number of sensor acquisition modules are arranged in the detection chamber 100, and different sensor acquisition modules are used to acquire different parameters of the transformer insulating oil to be detected; a breathable, waterproof and pressure-reducing device 101 is arranged at the top of the detection chamber 100; a screen window structure is arranged in the detection chamber 100, and the screen window structure is used to make the distribution of polar molecules in the transformer insulating oil to be detected uniform; a heating device is arranged on the outer wall of the detection chamber 100, and the heating device is used to heat the transformer insulating oil in the detection chamber 100 so that the transformer insulating oil releases the dissolved gas.

[0018] As a preferred specific implementation manner, the heating device is used to heat the transformer insulating oil in the detection chamber 100 to 50°C and keep it. Thus, it is beneficial for the transformer insulating oil to quickly and stably release the dissolved gas therein, and can inhibit the oxidation of the insulating oil caused by too high temperature.

[0019] As a preferred specific embodiment, the breathable waterproof pressure reducing device 101 is a tube communicating with the outside air. A diaphragm made of a polymer material is provided in the middle of the tube. The diaphragm is used to allow air to pass freely and prevent water molecules in the air from entering the detection chamber 100. Thus, nitrogen and oxygen molecules in the air can pass through the diaphragm freely, and the pressure in the detection chamber 100 is adjusted by the height of the insulating oil level in the tube. Since the pressure of the insulating oil in the transformer is close to the atmospheric pressure, when the detection chamber 100 is filled with oil, the air in the detection chamber 100 will be discharged into the atmosphere through the tube.

[0020] As a preferred specific embodiment, the screen window type structure is made of a polymer material with a surface tension greater than a preset value. The mesh size of the screen window type structure is 1-10 mm. The screen window type structures are evenly arranged at each position where the screen window type structure is provided. The mesh surface of the screen window type structure at each position is perpendicular to the circulation direction of the transformer insulating oil in the detection chamber 100. The screen window type structure at each position is 2-3 layers, and the size of each layer is equal to the size of the cross-section of the detection chamber 100 perpendicular to the insulating oil circulation direction. Based on the above mesh size, it can play a role in evenly separating polar molecules, without increasing the oil pressure in the detection chamber 100, and ensuring that the screen window type structure is not blocked by the particles in the insulating oil. The above preset value is an empirical value.

[0021] As a preferred specific embodiment, the sensor acquisition module provided in the detection chamber 100 includes: chromaticity detection sensor acquisition module, appearance detection sensor acquisition module, breakdown voltage detection sensor acquisition module, dielectric constant detection sensor acquisition module, volume resistivity detection sensor acquisition module, particle contamination detection sensor acquisition module, interfacial tension detection sensor acquisition module, water-soluble acid detection sensor acquisition module, acid value detection sensor acquisition module, moisture detection sensor acquisition module, corrosive sulfur detection sensor acquisition module, disulfide detection sensor acquisition module, temperature detection sensor acquisition module, sludge and sediment detection sensor acquisition module, and antioxidant additive detection sensor acquisition module. Thus, the detection of multiple parameters of the transformer insulating oil can be realized.

[0022] As a preferred specific embodiment, the detection chamber 100 has a cuboid structure. The acid value detection sensor acquisition module, the moisture detection sensor acquisition module, the dielectric constant detection sensor acquisition module, and the volume resistivity detection sensor acquisition module are arranged at the bottom of the detection chamber 100 with their sensitive surfaces facing upward; the chromaticity detection sensor acquisition module and the appearance detection sensor acquisition module are arranged above the detection chamber 100 with their sensitive surfaces facing downward; the breakdown voltage detection sensor acquisition module, the particle contamination detection sensor acquisition module, the interfacial tension detection sensor acquisition module, the water-soluble acid detection sensor acquisition module, the corrosive sulfur detection sensor acquisition module, the disulfide detection sensor acquisition module, the temperature detection sensor acquisition module, the sludge and sediment detection sensor acquisition module, and the antioxidant additive detection sensor acquisition module are arranged on the surrounding surfaces of the detection chamber 100. Based on this setting position, it is beneficial to improve the detection accuracy of each sensor acquisition module for transformer insulating oil.

[0023] Sampling pipeline 200, which is used to convey the transformer insulating oil to be detected to the detection chamber 100.

[0024] As a specific embodiment, the first port of the sampling pipeline 200 is connected to the oil inlet, and the second port of the sampling pipeline 200 is connected to the first port of the detection chamber 100; a first valve 201 is arranged on the sampling pipeline 200, and the first valve 201 is used to control the opening and closing of the sampling pipeline 200.

[0025] As a preferred specific embodiment, the first port of the detection chamber 100 is provided with a screen-like structure, which is beneficial to making the distribution of polar molecules in the insulating oil to be detected more uniform and beneficial to further improving the detection accuracy of the transformer insulating oil.

[0026] Circulation pipeline 300, which is used to circulate the transformer insulating oil in the detection chamber 100.

[0027] As a specific embodiment, a first oil pump 301 and a second valve 302 are arranged on the circulation pipeline 300. The input port of the first oil pump 301 is connected to the second port of the detection chamber 100, the oil outlet of the first oil pump 301 is connected to the first port of the second valve 302, and the second port of the second valve 302 is connected to the third port of the detection chamber 100.

[0028] As a preferred specific embodiment, the second port of the detection chamber 100 is provided with a screen-like structure, which is beneficial to making the distribution of polar molecules in the insulating oil to be detected more uniform and beneficial to further improving the detection accuracy of the transformer insulating oil.

[0029] As a preferred specific embodiment, the first oil pump 301 is used to keep the transformer insulating oil in the detection chamber 100 circulating at a rate of one cycle in 30 - 120 seconds, which is beneficial to improving the detection accuracy of each sensor acquisition module for the transformer insulating oil.

[0030] A data processing module 400, which is used to process the data collected by the sensor acquisition module.

[0031] As a specific embodiment, the input end of the data processing module 400 is connected to the sensor acquisition module, the output end of the data processing module 400 is connected to a display 500 and an external signal transmission end, and the external signal transmission end is used to send the processed data to a data center 600 in a wired or wireless manner. Optionally, the external signal transmission end can also store the processed data in a data memory card.

[0032] An oil discharge pipeline 700, which is used to discharge the detected transformer insulating oil. The first port of the oil discharge pipeline 700 is connected to the oil outlet of a return oil pump 701, and the second port of the oil discharge pipeline 700 is connected to an oil discharge port; A return oil pump 701, a third valve 702 and a plug-in filter 703 are arranged on the oil discharge pipeline 700. The third valve 702 is used to control the opening and closing of the oil discharge pipeline 700, and the plug-in filter 703 is used to filter impurities in the detected transformer insulating oil.

[0033] As a preferred specific embodiment, the materials in the plug-in filter 703 include filter paper, silica gel, activated carbon, molecular sieve, metal powder sintered material, metal microporous material, ceramic filter material and filter paper core. Thus, polar molecules, metal cations, particulate matters and sludge in the insulating oil flowing back in the oil discharge pipeline 700 can be filtered out.

[0034] A housing, which is used to avoid external environmental interference. The housing is a fully enclosed stainless steel housing. There are a front door and a back door that can be opened on the housing, and a spare plug-in filter is arranged on the inner wall of the housing.

[0035] In this embodiment, the spare plug-in filter arranged on the inner wall of the housing can be used to replace the plug-in filter 703 arranged on the oil discharge pipeline 700; The housing needs a good grounding line to shield external electromagnetic interference; The housing can also protect the parts inside the housing from the influence of the external meteorological environment, which is beneficial to reading data and also convenient for replacing internal devices during operation and maintenance.

[0036] The monitoring system of this embodiment can achieve on-line monitoring of the insulating oil of the transformer, which is beneficial to timely detecting internal faults of the transformer and greatly reducing the downtime rate of the transformer; moreover, it can collect various parameters of the insulating oil of the transformer to achieve comprehensive monitoring of the insulating oil of the transformer. In particular, a ventilation, waterproof and pressure-reducing device 101 is provided at the top of the detection chamber 100 in the monitoring system of this embodiment. The ventilation, waterproof and pressure-reducing device 101 has the functions of ventilation and pressure reduction, and at the same time has the function of waterproofing, which is beneficial for multiple sensor acquisition modules to accurately detect the insulating oil of the transformer at the same time; a pluggable filter is provided on the oil discharge pipeline 700 of this embodiment, which can effectively filter out impurities in the detected insulating oil of the transformer, which is beneficial for the reuse of the detected insulating oil of the transformer. The detected insulating oil of the transformer can be re-transported to the insulating oil of the transformer, which can reduce the loss of the insulating oil of the transformer caused by high-frequency detection; a screen window structure is also provided in the detection chamber of this embodiment, which can make the distribution of polar molecules in the insulating oil to be detected uniform, which is beneficial to improving the detection accuracy of the insulating oil of the transformer; this embodiment is also provided with a housing, which can avoid interference from rainwater, electromagnetic fields, etc. in the external environment, which is beneficial to improving the reliability and accuracy of the monitoring system of this embodiment for monitoring the insulating oil of the transformer, and is also beneficial to improving the service life of the monitoring system.

[0037] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present invention. Those skilled in the art should also understand that various modifications can be made to the embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. An improved on-line monitoring system for transformer insulating oil, characterized in that, The monitoring system includes: A detection chamber (100) for containing the transformer insulating oil to be detected. A number of sensor acquisition modules are arranged in the detection chamber (100), and different sensor acquisition modules are used to acquire different parameters of the transformer insulating oil to be detected; a breathable, waterproof and pressure-reducing device (101) is arranged at the top of the detection chamber (100); a screen window structure is arranged in the detection chamber (100) to make the distribution of polar molecules in the transformer insulating oil to be detected uniform; a heating device is arranged on the outer wall of the detection chamber (100) to heat the transformer insulating oil in the detection chamber (100) so that the dissolved gas in the transformer insulating oil is released. A sampling pipeline (200) for transporting the transformer insulating oil to be detected to the detection chamber (100). A circulation pipeline (300) for circulating the transformer insulating oil in the detection chamber (100); a first oil pump (301) and a second valve (302) are arranged on the circulation pipeline (300). The inlet of the first oil pump (301) is connected to the second port of the detection chamber (100), the outlet of the first oil pump (301) is connected to the first port of the second valve (302), and the second port of the second valve (302) is connected to the third port of the detection chamber (100). A data processing module (400) for processing the data acquired by the sensor acquisition module. An oil discharge pipeline (700) for discharging the detected transformer insulating oil. The first port of the oil discharge pipeline (700) is connected to the outlet of the first oil pump (301), and the second port of the oil discharge pipeline (700) is connected to the oil discharge port; a return oil pump (701), a third valve (702) and a plug-in filter (703) are arranged on the oil discharge pipeline (700). The third valve (702) is used to control the opening and closing of the oil discharge pipeline (700), and the plug-in filter (703) is used to filter impurities in the detected transformer insulating oil. A housing for preventing interference from the external environment. The housing is a fully enclosed stainless steel housing with an openable front door and rear door, and a spare plug-in filter is arranged on the inner wall of the housing.

2. The improved on-line monitoring system for transformer insulating oil according to claim 1, characterized in that, The first port of the sampling pipeline (200) is connected to the oil inlet, and the second port of the sampling pipeline (200) is connected to the first port of the detection chamber (100); a first valve (201) is arranged on the sampling pipeline (200) to control the opening and closing of the sampling pipeline (200).

3. The improved on-line monitoring system for transformer insulating oil according to claim 2, characterized in that, A screen window structure is arranged at the first port of the detection chamber (100).

4. The improved on-line monitoring system for transformer insulating oil according to claim 1, characterized in that, A screen window structure is arranged at the second port of the detection chamber (100).

5. The improved on-line monitoring system for transformer insulating oil according to claim 1, wherein The input end of the data processing module (400) is connected to the sensor acquisition module, the output end of the data processing module (400) is connected to the display (500) and the external signal transmission end, and the external signal transmission end is used to send the processed data to the data center (600) in a wired or wireless manner.

6. The improved on-line monitoring system for transformer insulating oil according to claim 1, characterized in that The heating device is used to heat the transformer insulating oil in the detection chamber (100) to 50 °C and keep it at that temperature.

7. The improved on-line monitoring system for transformer insulating oil according to claim 1, characterized in that, The screen window structure is made of a polymer material with a surface tension greater than a preset value. The mesh size of the screen window structure is 1 - 10 mm. The screen window structure is evenly arranged at each position where the screen window structure is provided. The mesh surface of the screen window structure at each position is perpendicular to the circulation direction of the transformer insulating oil in the detection chamber (100). The screen window structure at each position is 2 - 3 layers.

8. The improved on-line monitoring system for transformer insulating oil according to claim 1, wherein, The air permeable, waterproof and pressure reducing device (101) is a tube communicating with the outside air. A diaphragm made of a polymer material is arranged in the middle of the tube. The diaphragm is used to allow air to pass freely and prevent water molecules in the air from entering the detection chamber.

9. The improved on-line monitoring system for transformer insulating oil according to claim 1, characterized in that The materials in the plug-in filter include filter paper, silica gel, activated carbon, molecular sieve, sintered metal powder material, metal microporous material, ceramic filter material and filter paper core.

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