Transformer oil dissolved gas monitoring system

Abstract

The invention discloses a transformer oil dissolved gas monitoring system. The device comprises a measuring chamber, a gas detection module and a control module, the gas detection module comprises a first sensor and a temperature sensor; the first sensor comprises a first cathode, a first extraction electrode, a first collection electrode and a first insulation structure which are sequentially arranged along a first direction; the first insulating structure has a first height along the first direction; the temperature sensor comprises a second cathode, a second extraction electrode, a second collection electrode and a second insulation structure which are sequentially arranged in the first direction. The second insulating structure has a second height along the first direction; the control module is used for determining the actual concentration and the actual temperature of the first gas according to the first gas signal and the temperature signal. According to the technical scheme, the influence of the transformer oil temperature on the performance of the first gas sensor is solved, the accuracy and reliability of gas detection are improved, and the problems of low error, high repeatability, high sensitivity, high integration level and the like are solved.

Description

Technical Field

[0001] The invention relates to the technical field of transformer online monitoring, and in particular to a transformer oil dissolved gas monitoring system. Background Art

[0002] In the development of the power Internet of Things and smart grids, real-time monitoring of the operating status of electrical equipment is crucial for the efficient maintenance of power equipment and the safe operation of the power grid system. The detection of dissolved gas in oil-immersed power transformers has become one of the important means of monitoring the operating status of transformers and conducting fault diagnosis due to its economic advantages and suitability for early faults. In the existing gas detection process, the performance of most gas sensors is usually affected by temperature, resulting in large detection errors when the transformer oil temperature changes. The corresponding temperature compensation method has the problems of low integration, large size and high cost, resulting in low accuracy, reliability and repeatability of traditional gas detection methods in complex environments. Summary of the invention

[0003] The invention provides a transformer oil dissolved gas monitoring system to solve the problems of low gas detection accuracy and low reliability in the prior art.

[0004] A transformer oil dissolved gas monitoring system provided by the present invention comprises:

[0005] A measuring chamber, a gas detection module and a control module; the gas detection module is connected to the measuring chamber;

[0006] The gas detection module includes a first sensor and a temperature sensor;

[0007] The first sensor comprises a first cathode, a first extraction electrode, and a first collecting electrode arranged in sequence along a first direction; and further comprises a first insulating structure, wherein the first cathode and the first extraction electrode are connected via the first insulating structure, and the first extraction electrode and the first collecting electrode are connected via the first insulating structure; and the first insulating structure has a first height along the first direction;

[0008] The temperature sensor comprises a second cathode, a second extraction electrode, and a second collecting electrode arranged in sequence along a first direction; and further comprises a second insulating structure, wherein the second cathode and the second temperature extraction electrode are connected via the second insulating structure, and the second extraction electrode and the second collecting electrode are connected via the second insulating structure; the second insulating structure has a second height along the first direction; wherein the first height and the second height are different;

[0009] The control module is respectively connected to the first sensor and the temperature sensor for communication, and is used to determine the actual concentration and the actual temperature of the first gas according to the first gas signal of the first sensor and the temperature signal of the temperature sensor.

[0010] Optionally, the gas detection module further includes a second sensor;

[0011] The second sensor includes a third cathode, a third extraction electrode, and a third collecting electrode arranged in sequence along the first direction; and also includes a third insulating structure, wherein the third cathode and the third extraction electrode are connected via the third insulating structure, and the third extraction electrode and the third collecting electrode are connected via the third insulating structure; the third insulating structure has a third height along the first direction; wherein the first height, the second height, and the third height are different;

[0012] The control module is also in communication connection with the second sensor, and is used to determine the actual concentration of the first gas and the actual concentration of the second gas according to the first gas signal and the second gas signal of the second sensor.

[0013] Optionally, the actual concentration of the first gas is the actual concentration of hydrogen; the actual concentration of the second gas is the actual concentration of acetylene; and the first height is less than the second height, and the second height is less than the third height.

[0014] Optionally, the first cathode and the second cathode are integrally provided and isolated from each other by an insulating medium.

[0015] Optionally, the first cathode, the second cathode, the first extraction electrode and the second extraction electrode each include at least one hole structure.

[0016] Optionally, the control module includes a first computing unit and a second computing unit;

[0017] The first computing unit is communicatively connected to the second computing unit, the first sensor, and the second sensor respectively, and the second computing unit is communicatively connected to the temperature sensor;

[0018] The first calculation unit is used to fit the first gas signal and the second gas signal and determine the actual concentration of the first gas and the actual concentration of the second gas;

[0019] The second calculation unit is used to receive the actual concentration and temperature signal of the first gas and determine the actual temperature.

[0020] Optionally, a degassing module is further included; the degassing module is communicated with the measuring chamber;

[0021] The degassing module comprises a degassing chamber; the degassing chamber comprises an oil blocking plate, a gas inlet, a gas outlet and an oil inlet and outlet, the oil blocking plate is arranged inside the degassing chamber and isolates the gas outlet from the gas inlet and the oil inlet and outlet;

[0022] The oil blocking plate comprises an oil blocking plate body and a filter membrane; the filter membrane is wound on the surface of the oil blocking plate body; the oil blocking plate is used to prevent oil mist from being discharged along the gas outlet.

[0023] Optionally, it also includes a data processing module;

[0024] The gas detection module and the control module are communicatively connected via the data processing module;

[0025] The data processing module is used to receive the first gas signal and the temperature signal and identify and transmit them to the control module.

[0026] Optionally, the data processing module includes a gas coupling unit, a data acquisition storage unit and a data communication unit;

[0027] The gas coupling unit is used to receive and identify the first gas signal and the temperature signal and transmit them to the data acquisition storage unit;

[0028] The data acquisition storage unit is used to store the first gas signal and the temperature signal and transmit the first gas signal and the temperature signal to the data communication unit;

[0029] The data communication unit is used to transmit the first gas signal and the temperature signal to the control module.

[0030] Optionally, a display unit is also included;

[0031] The display unit includes a display screen and function buttons, which are respectively connected to the control module for communication; the display screen is used to display the actual concentration and actual temperature of the first gas; the function buttons are used to receive instructions from the operator and control the working state of the control module.

[0032] The technical solution of the present invention solves the influence of transformer oil temperature on the performance of the first gas sensor by arranging a temperature sensor of the first sensor in the gas detection module, arranging a first insulating structure with a first height in the first sensor, and arranging a second insulating structure with a second height in the temperature sensor, and the first height and the second height are different, thereby improving the accuracy and reliability of gas detection, low error and high repeatability, high sensitivity and high integration, and other issues.

[0033] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1A connection diagram of a transformer oil dissolved gas monitoring system provided by an embodiment of the present invention;

[0036] Figure 2 A schematic diagram of the structure of a gas detection module provided by an embodiment of the present invention;

[0037] Figure 3 A schematic diagram of fitting a hydrogen sensitivity line and a temperature sensitivity line provided in an embodiment of the present invention;

[0038] Figure 4 A schematic diagram of fitting a hydrogen sensitivity line and an acetylene sensitivity line provided in an embodiment of the present invention;

[0039] Figure 5 A schematic diagram of the structure of a degassing module provided in an embodiment of the present invention;

[0040] Figure 6 A schematic diagram of the structure of a data processing module provided by an embodiment of the present invention;

[0041] Figure 7 A schematic structural diagram of a display unit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0043] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0044] The performance of most gas sensors is usually affected by temperature. When the transformer oil temperature changes during operation, the detection error is large. Therefore, it is imperative to monitor the temperature of the transformer oil. However, existing temperature compensation methods have problems such as low integration, large size, and high cost. Since the temperature of the transformer is between 20 and 120°C during normal operation, commonly used gas monitoring technologies such as gas chromatography, infrared spectroscopy, and photoacoustic spectroscopy are all susceptible to temperature changes, which seriously affects the accuracy of fault gas detection. The sensor cannot detect gas concentration and temperature at the same time, and the detected gases are all oxidizing gases. In addition, due to the different properties of different gases, the ionization processes are also different. Therefore, an embodiment of the present invention provides a transformer oil dissolved gas detection system, Figure 1 A connection diagram of a transformer oil dissolved gas monitoring system provided by an embodiment of the present invention, Figure 2 The structure diagram of a gas detection module provided by an embodiment of the present invention is shown in FIG. Figure 1 and Figure 2 As shown, the transformer oil dissolved gas monitoring system includes:

[0045] A measuring chamber 1, a gas detection module 2 and a control module 3; the gas detection module 2 is connected to the measuring chamber 1;

[0046] The gas detection module 2 includes a first sensor 21 and a temperature sensor 22;

[0047] The first sensor 21 includes a first cathode 211, a first extraction electrode 212, and a first collecting electrode 213 arranged in sequence along a first direction z; and also includes a first insulating structure 214, the first cathode 211 and the first extraction electrode 212 are connected through the first insulating structure 214, and the first extraction electrode 212 and the first collecting electrode 213 are connected through the first insulating structure 214; the first insulating structure 214 has a first height H1 along the first direction z;

[0048] The temperature sensor 22 includes a second cathode 221, a second extraction electrode 222, and a second collecting electrode 223 arranged in sequence along a first direction z; and also includes a second insulating structure 224, the second cathode 221 and the second temperature extraction electrode are connected through the second insulating structure 224, and the second extraction electrode 222 and the second collecting electrode 223 are connected through the second insulating structure 224; the second insulating structure 224 has a second height H2 along the first direction z; wherein the first height H1 and the second height H2 are different;

[0049] The control module 3 is in communication connection with the first sensor 21 and the temperature sensor 22 respectively, and is used to determine the actual concentration and actual temperature of the first gas according to the first gas signal of the first sensor 21 and the temperature signal of the temperature sensor 22 .

[0050] The gas detection module 2 is connected to the measurement chamber 1 and can detect the gas concentration and temperature in the measurement chamber 1. The gas detection module 2 includes a first sensor 21 and a temperature sensor 22. Since the working principle of all sensors is based on the dependence of the discharge current on the gas concentration and temperature, there is an exponential relationship between the discharge current and the electrode spacing, which enables the sensor to reflect the changes in gas concentration and temperature through the changes in the output current. Sensors with different electrode spacings respond differently to gas concentration and temperature, so a first sensor 21 is provided including a first cathode 211, a first extraction electrode 212, and a first collecting electrode 213 arranged in sequence along a first direction z; and also including a first insulating structure 214, the first cathode 211 and the first extraction electrode 212 are connected via the first insulating structure 214, and the first extraction electrode 212 and the first collecting electrode 213 are connected via the first insulating structure 214, so the dimension of the first insulating structure 214 along the first direction z is the electrode spacing, and a voltage is applied between the first extraction electrode 212 and the first collecting electrode 213 so that an electric field is generated between the first extraction electrode 212 and the first cathode 211, and between the first extraction electrode 212 and the first collecting electrode 213, the first cathode 211 is ionized, the first extraction electrode 212 absorbs electrons, and the first collecting electrode 213 collects positive ions to generate current. The temperature sensor 22 includes a second cathode 221, a second extraction electrode 222, and a second collecting electrode 223 arranged in sequence along a first direction z; and also includes a second insulating structure 224. The second cathode 221 and the second temperature extraction electrode are connected through the second insulating structure 224, and the second extraction electrode 222 and the second collecting electrode 223 are connected through the second insulating structure 224. Therefore, the size of the second insulating structure 224 along the first direction z is the electrode spacing. A voltage is applied between the second extraction electrode 222 and the second collecting electrode 223 so that an electric field is generated between the second extraction electrode 222 and the second cathode 221, and between the second extraction electrode 222 and the second collecting electrode 223, so that the second cathode 221 is ionized, the second extraction electrode 222 absorbs electrons, and the second collecting electrode 223 collects positive ions to generate current. The first height H1 is set to be different from the second height H2, that is, the first sensor 21 and the temperature sensor 22 have different responses to gas concentration and temperature, so that the first sensor 21 and the temperature sensor 22 can monitor two different parameters simultaneously without being interfered with each other, and the sensitive characteristic curves of different sensors at different gas concentrations and temperatures will not overlap. This means that the response of each sensor to a specific parameter is unique, thereby avoiding cross-interference, and further facilitating the control module 3 to determine the actual concentration of the first gas detected by the first sensor 21 and the actual temperature detected by the temperature sensor 22 .

[0051] It can be understood that the first height H1 of the first insulating structure 214 can be determined according to the type of the detected first gas, and the second height H2 of the second insulating structure 224 can be determined according to the temperature sensor 22 .

[0052] In some embodiments, the first cathode 211 and the second cathode 221 may be carbon nanotube films with a length of 27 mm and a width of 8 mm; the first insulating structure 214 and the second insulating structure 224 may be polyester films with a length of 27 mm and a width of 8 mm.

[0053] Among them, the control module 3 can be used to receive the first gas signal of the first sensor 21 and the temperature signal of the temperature sensor 22. The first gas signal and the temperature signal will intersect on the sensitive surface to provide intersection data, and then the actual concentration and actual temperature of the first gas can be determined through the intersection data of the first gas signal and the temperature signal.

[0054] Exemplarily, the first gas is hydrogen, the first sensor 21 is a hydrogen sensor, the first cathode 211 is a carbon nanotube film that is 27 mm long and 8 mm wide, and the first extraction electrode 212 and the first collecting electrode 213 are also 27 mm long and 8 mm wide. The first height H1 of the first insulating structure 214 corresponds to the electrode spacing of hydrogen, that is, a polyester film that is 27 mm long, 8 mm wide and 75 μm high. The second cathode 221 of the temperature sensor 22 is a carbon nanotube film that is 27 mm long and 8 mm wide, and the second extraction electrode 222 and the second collecting electrode 223 are also 27 mm long and 8 mm wide. The second height H2 of the second insulating structure 224 corresponds to the electrode spacing of temperature, that is, a polyester film that is 27 mm long, 8 mm wide and 120 μm high. The control module 3 obtains the first gas signal and the temperature signal by measuring the collection current of the corresponding sensor, as shown in the figure for example. Figure 3 A schematic diagram of fitting a hydrogen sensitivity line and a temperature sensitivity line provided in an embodiment of the present invention is shown in FIG. Figure 3 As shown, the sensitivity line of the hydrogen sensor at 23.88 nA intersects with the sensitivity line of the temperature sensor 22 at 28.02 nA. According to the intersection point, it can be known that the actual concentration of hydrogen is 148.8 ppm and the actual temperature is 60.1°C.

[0055] The technical solution of the embodiment of the present invention solves the influence of transformer oil temperature on the performance of the first gas sensor, improves the accuracy and reliability of gas detection, reduces error and high repeatability, and improves high sensitivity and high integration by providing a temperature sensor of the first sensor in the gas detection module, and providing a first insulating structure with a first height in the first sensor, and providing a second insulating structure with a second height in the temperature sensor, and the first height and the second height are different.

[0056] Optional, continue to refer to Figure 1 and Figure 2 As shown, the gas detection module 2 further includes a second sensor 23;

[0057] The second sensor 23 includes a third cathode 231, a third extraction electrode 232, and a third collecting electrode 233 arranged in sequence along the first direction z; and also includes a third insulating structure 234, the third cathode 231 and the third extraction electrode 232 are connected by the third insulating structure 234, and the third extraction electrode 232 and the third collecting electrode 233 are connected by the third insulating structure 234; the third insulating structure 234 has a third height H3 along the first direction z; wherein the first height H1, the second height H2 and the third height H3 are different;

[0058] The control module 3 is also in communication connection with the second sensor 23 , and is used for determining the actual concentration of the first gas and the actual concentration of the second gas according to the first gas signal and the second gas signal of the second sensor 23 .

[0059] The second sensor 23 can be used to detect the concentration of the second gas. The second sensor 23 includes a third cathode 231, a third extraction electrode 232, and a third collection electrode 233 arranged in sequence along the first direction z; and also includes a third insulation structure 234. The third cathode 231 and the third extraction electrode 232 are connected by the third insulation structure 234, and the third extraction electrode 232 and the third collection electrode 233 are connected by the third insulation structure 234. Therefore, the size of the third insulation structure 234 along the first direction z is the electrode spacing. A voltage is applied between the third extraction electrode 232 and the third collection electrode 233 so that an electric field is generated between the third extraction electrode 232 and the third cathode 231, and between the third extraction electrode 232 and the third collection electrode 233. The third cathode 231 is ionized, the third extraction electrode 232 absorbs electrons, and the third collection electrode 233 collects positive ions to generate current. The control module 3 can receive the current and then calculate the actual concentration of the second gas.

[0060] It is understood that the third height H3 of the third insulating structure 234 can be determined according to the type of the second gas detected. In some embodiments, the third cathode 231 can be a carbon nanotube film with a length of 27 mm and a width of 8 mm; the third insulating structure 234 can be a polyester film material with a length of 27 mm and a width of 8 mm.

[0061] In some embodiments, the first gas actual concentration is the hydrogen actual concentration; the second gas actual concentration is the acetylene actual concentration; and the first height H1 is less than the second height H2, and the second height H2 is less than the third height H3. The first height H1 of the first insulating structure 214 can be set to 75 μm, the second height H2 of the second insulating structure 224 can be set to 100 μm, and the third height H3 of the third insulating structure 234 can be set to 120 μm, so as to achieve response to different gas concentrations and temperatures.

[0062] In some embodiments, the control module 3 includes a first calculation unit and a second calculation unit; the first calculation unit is respectively connected to the second calculation unit, the first sensor 21 and the second sensor 23 in communication, and the second calculation unit is connected to the temperature sensor 22 in communication; the first calculation unit is used to fit the first gas signal and the second gas signal and determine the actual concentration of the first gas and the actual concentration of the second gas; the second calculation unit is used to receive the actual concentration of the first gas and the temperature signal and determine the actual temperature. Among them, the first calculation unit is used to fit the first gas signal and the second gas signal and determine the actual concentration of the first gas and the actual concentration of the second gas. The specific operation can be to fit the sensitivity line of the first sensor 21 under the corresponding current and the sensitivity line of the second sensor 23 under the corresponding current, and determine the temperature value when the two sensitivity lines intersect, and determine the actual concentration of the first gas and the actual concentration of the second gas according to the temperature value. The second calculation unit is used to receive the actual concentration of the first gas and the temperature signal and determine the actual temperature. The specific operation is to fit the sensitivity line under the actual concentration of the first gas and the sensitivity line corresponding to the temperature signal, and determine the actual temperature according to the intersection of the two sensitivity lines.

[0063] Exemplarily, the first sensor 21 is a hydrogen sensor, and the second sensor 23 is an acetylene sensor. The control module 3 receives a hydrogen signal, an acetylene signal, and a temperature signal. Figure 4 A schematic diagram of fitting a hydrogen sensitivity line and an acetylene sensitivity line provided in an embodiment of the present invention is shown in FIG. Figure 4 As shown, the sensitivity line of the fitted hydrogen sensor at 23.88nA intersects with the sensitivity line of the acetylene sensor at 38.03nA, and the concentration values ​​of H2 and C2H2 are determined. The fitted sensitivity line at 23.88nA corresponds to the concentration value of H2 and the fitted sensitivity line at 38.03nA corresponds to the concentration value of C2H2. The two lines intersect on the sensitive surface, providing the concentration values ​​of H2 and C2H2. Through fitting, the concentration of H2 is determined to be 148.8ppm and the concentration of C2H2 is 1.0ppm, with a small error. Continue to refer to Figure 3 As shown, the sensitivity line of the fitted hydrogen sensor at 148.8ppm intersects with the sensitivity line of the temperature sensor 22 at 28.02nA to determine the temperature value. The fitted sensitivity line at 148.8ppm corresponds to the concentration value of H2, and the fitted sensitivity line at 28.02nA corresponds to the temperature value. The two lines intersect on the sensitive surface and provide the temperature value. Through fitting, the temperature is determined to be 60.1°C and the concentration of H2 is 148.8ppm. Through the intersection of the three lines, the concentration of H2 and C2H2 and the temperature value can be accurately determined, verifying the effectiveness of the sensor array in temperature compensation. This method not only improves the accuracy of detection, but also has the advantages of high integration and high sensitivity.

[0064] In some embodiments, the gas detection module 2 may further include three DC power supply modules and three digital multimeter modules for providing voltage excitation and measuring current.

[0065] The technical solution of the embodiment of the present invention improves detection accuracy by setting a second sensor in the gas detection module and determining the actual concentration of the first gas and the actual concentration of the second gas by acquiring the first gas signal and the second gas signal.

[0066] Optional, continue to refer to Figure 2 As shown, the first cathode 211 and the second cathode 221 are integrally arranged and the first cathode 211 and the second cathode 221 are isolated by an insulating medium 24 .

[0067] Among them, since the first gas sensor and the temperature sensor 22 both have cathodes, the first cathode 211 and the second cathode 221 can be arranged integrally, and the first sensor 21 and the temperature sensor 22 are isolated by an insulating medium 24 to ensure independent operation of the sensors.

[0068] In some embodiments, the insulating medium 24 may be tape. Using tape as the insulating medium 24 can simplify the manufacturing process, reduce production complexity and cost; improve space utilization: sharing the cathode reduces the total amount of material required and makes more space available for other components or for reducing the overall size of the sensor; enhance electrical isolation: using tape as the insulating medium 24 can provide good electrical isolation between different areas, prevent current leakage, and ensure the operational independence of each area; easy maintenance and adjustment: if the carbon nanotube film in a specific area needs to be replaced or adjusted, the presence of tape makes this process simple without having to handle the entire cathode.

[0069] Exemplarily, the electrode of each sensor can be prepared on an N-type single crystal silicon wafer by micro-electromechanical technology. The cathode with a length of 210 mm and a width of 8 mm can be divided into 7 independent areas by an insulating medium 24, each area is covered with a carbon nanotube film with a length of 27 mm and a width of 8 mm, and the insulating medium 24 can be a tape, and the corresponding extraction electrode and the collection electrode are arranged on the corresponding area, wherein three sensors have a first height H1=75 μm, three sensors have a second height H2=100 μm and a third height H3=120 μm. Therefore, there are three first sensors 21, three second sensors 23 and one temperature sensor 22 to ensure the detection accuracy. The control module 3 measures the magnitude of the current collected by the 7 sensors, and uses the measured current values ​​to fit 3 lines respectively; through the intersection of the 3 lines, the actual concentration of the first gas, the actual concentration of the second gas and the temperature value are determined.

[0070] The technical solution of the embodiment of the present invention forms a highly integrated ionization sensor array by integrally arranging the first cathode of the first sensor and the second cathode of the temperature sensor, which can perform temperature compensation while detecting the mixed gas, thereby improving the accuracy and reliability of the detection. The sensor array uses a cathode with a long silicon substrate, which has a small curvature radius and a high field enhancement factor, thereby significantly improving the sensitivity of the sensor. Compared with the existing sensor design, the sensor array of the embodiment of the present invention shows significant advantages in integration, sensitivity and error control, and provides a new solution for online detection of transformer fault gas.

[0071] Optional, continue to refer to Figure 2 As shown, the first cathode 211 , the second cathode 221 , the first extraction electrode 212 , and the second extraction electrode 222 each include at least one hole structure 25 .

[0072] When it is necessary to detect the gas composition of the measuring chamber 1, a hole structure 25 is provided in the first cathode 211, the second cathode 221, the first extraction electrode 212 and the second extraction electrode 222, so that the gas can flow through the electrode from the hole structure 25. For sensors involving ionization processes, the circular holes can provide more surface areas to promote the ionization process or help to evenly distribute the discharge. At the same time, the provision of the hole structure 25 reduces the weight of the electrode, helps to reduce the mass of the entire sensor, and enhances the structural stability.

[0073] In some embodiments, two hole structures 25 may be provided in the first cathode 211 and the second cathode 221, respectively, and one hole structure 25 may be provided in the first extraction electrode 212 and the second extraction electrode 222, respectively. A larger number of hole structures 25 in the first cathode 211 and the second cathode 221 helps to more evenly disperse the current density, avoid the formation of hot spots, and thus improve the discharge efficiency and stability.

[0074] The technical solution of the embodiment of the present invention can allow gas to flow through the electrodes from the hole structure by setting a hole structure in the first cathode, the second cathode, the first extraction electrode and the second extraction electrode. The setting of the hole structure reduces the weight of the electrode and enhances the structural stability.

[0075] Optional, Figure 5 A schematic diagram of a degassing module provided in an embodiment of the present invention, combined with Figure 5 and Figure 1 As shown, a degassing module 4 is also included; the degassing module 4 is connected to the measuring chamber 1;

[0076] The degassing module 4 includes a degassing chamber 41; the degassing chamber 41 includes an oil blocking plate 411, a gas inlet 412, a gas outlet 413 and an oil inlet and outlet 414, and the oil blocking plate 411 is arranged inside the degassing chamber 41 and isolates the gas outlet 413 from the gas inlet and the oil inlet and outlet 414;

[0077] The oil blocking plate 411 includes an oil blocking plate body and a filter membrane; the filter membrane is wound on the surface of the oil blocking plate body; the oil blocking plate 411 is used to prevent oil mist from being discharged along the gas outlet 413. Figure 5 (not shown)

[0078] The degassing module 4 can be used to degas the transformer oil to obtain dissolved gas into the measuring chamber 1. The gas detection module 2 detects the gas obtained by the degassing module 4.

[0079] Among them, the degassing module 4 includes a degassing chamber 41, and the degassing chamber 41 is used for degassing. In the prior art, when the oil enters the degassing chamber 41 from the oil inlet and outlet 414, and the gas enters the degassing chamber 41 from the gas inlet 412, the pressure of the entire device is adjusted to a low pressure state; when the internal air pressure of the device is kept constant, the oil is evenly heated by low-frequency stirring and thermal resistance to ensure the rapid precipitation of gas molecules, but this method is found to have oil reflux during the actual test process. The reflux of oil will cause oil droplets to enter the air duct and cause damage to the system. Therefore, in the embodiment of the present invention, an oil blocking plate 411 is set in the degassing chamber 41 to prevent the oil from entering the gas pipeline. However, after the gas is removed from the transformer oil, it is inevitable that the gas contains oil mist. As the use time increases, when the oil mist accumulates to a certain amount, it will cause pollution to the gas pipeline, thereby affecting the detection accuracy. Therefore, a filter membrane is set on the body of the oil blocking plate in the degassing chamber 41 to further filter the oil mist in the gas.

[0080] In some embodiments, the filter membrane may be a polytetrafluoroethylene microporous membrane, which is wound on the oil-blocking plate body with 10 windings.

[0081] In some embodiments, the monitoring system further includes a filter 42, an oil discharge three-way valve 431, a calibration three-way valve 432, an air chamber 44, an air pump 45, a first air valve 433, a second air valve 434, a one-way valve 435, a first oil valve 436, a second oil valve 437, an oil pump 46, a waste oil valve 438, a liquid level meter 47 and a pressure sensor 48. The specific setting method is: a filter 42 is connected to the top of the degassing chamber 41, and the filter 42 is connected to the waste oil valve 438 on the one hand, which is used to discharge the waste oil generated during the filtering process. The filter 42 is also connected to the oil discharge three-way valve 431, which is not only connected to the air inlet, but also connected to the standard gas inlet through the calibration three-way valve 432, to ensure that the system can accurately introduce standard gas for calibration or testing. The pressure sensor 48 is connected to the air chamber 44 for monitoring the pressure changes in the air chamber 44; the air chamber 44 is connected to the air pump 45 through a pipeline. The first gas valve 433 is connected to the air pump 45 and the exhaust port to discharge the treated gas; the second gas valve 434 is connected to the air inlet and the one-way valve 435 to ensure that the gas can only flow into the system in one direction. Liquid level sensors are installed inside and outside the degassing chamber 41 to ensure the effectiveness and safety of the degassing process. The system in the embodiment of the present invention adopts the structural design of "low pressure-constant temperature-dynamic headspace balance" to improve the oil-gas separation rate. The operation and device of this method are relatively simple, the degassing volume is large, the repeatability is strong, and it is less affected by the external environment. The separation speed is fast and it is more suitable for online equipment. Compared with the traditional dynamic headspace method, there is no need for carrier gas purging, the oil sample is not polluted, and the oil sample can be returned to the transformer tank. The main working parameters of the degassing module 4 are: temperature is 50±1.3℃, pressure is 28±2.7kPa, stirring speed is 72±3r / min, the injected oil sample volume is 650mL, the volume of the degassing chamber 41 is 1200ml, and the diffusion cross section is 22cm 2 The control module 3 can control the degassing module 4 to switch working states, and its main working states include default, oil filling, oil draining, external purge of the gas path, internal purge of the gas path, extraction of negative pressure, degassing sampling, and oil treatment.

[0082] The technical solution of the embodiment of the present invention is to set an oil-blocking plate in the degassing module to prevent liquid droplets from entering the gas pipeline, and at the same time improve it by wrapping the cover plate with a filter membrane to indirectly improve the detection accuracy. By applying the degassing module in the monitoring system, the dissolved fault characteristic gas can be effectively separated from the transformer insulating oil, so that the equipment not only has high sensitivity, but also has good reliability and stability.

[0083] Optional, continue to refer to Figure 1 As shown, it also includes a data processing module 5;

[0084] The gas detection module 2 and the control module 3 are communicatively connected via the data processing module 5;

[0085] The data processing module 5 is used to receive the first gas signal and the temperature signal and identify and transmit them to the control module 3 .

[0086] Among them, the data processing module 5 can play the role of collecting, storing and transmitting. The gas detection module 2 can be connected to the data processing module 5 through the RS485 serial port, and the data processing module 5 and the control module 3 can be connected by wired transmission or wireless transmission. The data processing module 5 can identify and transmit the first gas signal and temperature signal to the control module 3.

[0087] In some embodiments, Figure 6 A schematic diagram of a data processing module provided in an embodiment of the present invention, combined with Figure 1 and Figure 6 As shown, the data processing module 5 includes a gas coupling unit 51, a data acquisition and storage unit 52, and a data communication unit 53; the gas coupling unit 51 is used to receive and identify the first gas signal and the temperature signal and transmit them to the data acquisition and storage unit 52; the data acquisition and storage unit 52 is used to store the first gas signal and the temperature signal and transmit the first gas signal and the temperature signal to the data communication unit 53; the data communication unit 53 is used to transmit the first gas signal and the temperature signal to the control module 3. Among them, the gas coupling unit 51 can couple and identify the extracted multi-parameter special gas concentration value through a coupling algorithm; the data acquisition and storage unit 52 can select a mode according to the needs of the actual working detection process, and can be set to a data acquisition and data storage mode, and when the data storage mode is selected, the file saving path can be determined, and when the acquisition mode is selected, the concentration and coupling results can be uploaded to the control module 3 through the data communication unit 53. The data communication unit 53 can transmit the monitored data information to the control unit module through wired or wireless transmission.

[0088] The technical solution of the embodiment of the present invention realizes the functions of data transmission, storage and identification by setting a data processing unit between the gas detection module and the control module, thereby ensuring the normal operation of the transformer oil dissolved gas monitoring system.

[0089] Optional, Figure 7 A schematic diagram of a display unit provided in an embodiment of the present invention, Figure 1 and Figure 7 As shown, it also includes a display unit 6;

[0090] The display unit 6 includes a display screen 61 and a function button 62, which are respectively connected to the control module 3 for communication; the display screen 61 is used to display the actual concentration and actual temperature of the first gas; the function button 62 is used to receive instructions from the operator and control the working state of the control module 3.

[0091] Among them, the display screen 61 can display the actual concentration of multiple gases in real time, and through the concentration trend charts and concentration data tables of various gases, the historical concentration changes of each gas can be more intuitively observed. It can also display the current detection status of the system, the current instrument operation status, the real-time concentration of each gas, the fault nature of the transformer, and when the instrument fails, the fault status of the instrument is displayed. The display screen 61 can also display the concentration change curve to more intuitively observe the concentration changes of dissolved gases in the transformer oil. If an abnormal concentration is detected, an alarm is issued through the fault nature display function.

[0092] Among them, the function button 62 can be divided into connect, disconnect, save, start, stop and set. The operator can use the function button 62 to drive the data acquisition and storage unit to realize the concentration data saving function, drive each module to run and start the monitoring system. The setting function supports setting the concentration upper limit, provides an automatic alarm function when the gas concentration exceeds the range, and can also set the measurement interval and data display format, and customize the length and number of points of the data.

[0093] In some embodiments, a power supply module 7 is also included to supply power to the power-consuming modules in the system in real time.

[0094] The technical solution of the embodiment of the present invention realizes the display output of data by setting the display screen 61 and the function button 62, which is convenient for operators to receive information and perform functional operations, thereby ensuring the normal operation of the transformer oil dissolved gas monitoring system.

[0095] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A transformer oil dissolved gas monitoring system, characterized in that: include: A measuring chamber, a gas detection module and a control module; the gas detection module is in communication with the measuring chamber; The gas detection module includes a first sensor and a temperature sensor; The first sensor comprises a first cathode, a first extraction electrode, and a first collecting electrode arranged in sequence along a first direction; and further comprises a first insulating structure, wherein the first cathode and the first extraction electrode are connected via the first insulating structure, and the first extraction electrode and the first collecting electrode are connected via the first insulating structure; and the first insulating structure has a first height along the first direction; The temperature sensor comprises a second cathode, a second extraction electrode, and a second collecting electrode arranged in sequence along the first direction; further comprises a second insulating structure, the second cathode and the second temperature extraction electrode are connected via the second insulating structure, and the second extraction electrode and the second collecting electrode are connected via the second insulating structure; the second insulating structure has a second height along the first direction; wherein the first height and the second height are different; The control module is communicatively connected to the first sensor and the temperature sensor respectively, and is used to determine the actual concentration and actual temperature of the first gas according to the first gas signal of the first sensor and the temperature signal of the temperature sensor.

2. The transformer oil dissolved gas monitoring system according to claim 1, characterized in that: The gas detection module also includes a second sensor; The second sensor comprises a third cathode, a third extraction electrode, and a third collecting electrode arranged in sequence along the first direction; and further comprises a third insulating structure, wherein the third cathode and the third extraction electrode are connected via the third insulating structure, and the third extraction electrode and the third collecting electrode are connected via the third insulating structure; the third insulating structure has a third height along the first direction; wherein the first height, the second height, and the third height are different; The control module is also in communication with the second sensor for determining the actual concentration of the first gas and the actual concentration of the second gas according to the first gas signal and the second gas signal of the second sensor.

3. The transformer oil dissolved gas monitoring system according to claim 2, characterized in that: The actual concentration of the first gas is the actual concentration of hydrogen; the actual concentration of the second gas is the actual concentration of acetylene; and the first height is less than the second height, and the second height is less than the third height.

4. The transformer oil dissolved gas monitoring system according to claim 1, characterized in that: The first cathode and the second cathode are integrally arranged and isolated from each other by an insulating medium.

5. The transformer oil dissolved gas monitoring system according to claim 1, characterized in that: The first cathode, the second cathode, the first extraction electrode and the second extraction electrode each include at least one hole structure.

6. The transformer oil dissolved gas monitoring system according to claim 2, characterized in that: The control module includes a first calculation unit and a second calculation unit; The first computing unit is communicatively connected to the second computing unit, the first sensor and the second sensor respectively, and the second computing unit is communicatively connected to the temperature sensor; The first calculation unit is used to fit the first gas signal and the second gas signal and determine the actual concentration of the first gas and the actual concentration of the second gas; The second calculation unit is used to receive the actual concentration of the first gas and the temperature signal and determine the actual temperature.

7. The transformer oil dissolved gas monitoring system according to claim 1, characterized in that: It also includes a degassing module; the degassing module is in communication with the measuring chamber; The degassing module comprises a degassing chamber; the degassing chamber comprises an oil blocking plate, a gas inlet, a gas outlet and an oil inlet and outlet, the oil blocking plate is arranged inside the degassing chamber and isolates the gas outlet from the gas inlet and the oil inlet and outlet; The oil-blocking plate comprises an oil-blocking plate body and a filter membrane; the filter membrane is wound on the surface of the oil-blocking plate body; the oil-blocking plate is used to prevent oil mist from being discharged along the gas outlet.

8. The transformer oil dissolved gas monitoring system according to claim 1, characterized in that: Also includes a data processing module; The gas detection module and the control module are communicatively connected via the data processing module; The data processing module is used to receive the first gas signal and the temperature signal, identify and transmit them to the control module.

9. The transformer oil dissolved gas monitoring system according to claim 8, characterized in that: The data processing module includes a gas coupling unit, a data acquisition and storage unit, and a data communication unit; The gas coupling unit is used to receive and identify the first gas signal and the temperature signal and transmit them to the data acquisition storage unit; The data acquisition storage unit is used to store the first gas signal and the temperature signal and transmit the first gas signal and the temperature signal to the data communication unit; The data communication unit is used to transmit the first gas signal and the temperature signal to the control module.

10. The transformer oil dissolved gas monitoring system according to claim 1, characterized in that: Also includes a display unit; The display unit includes a display screen and function buttons, which are respectively connected to the control module for communication; the display screen is used to display the actual concentration of the first gas and the actual temperature; the function buttons are used to receive instructions from an operator and control the working state of the control module.

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