A method and apparatus for monitoring migration of a characteristic gas, a terminal device, and a medium

Abstract

The application discloses a kind of feature gas migration monitoring method, device, terminal equipment and medium, in obtaining the position parameter of the sampling point of the transformer riser to be measured, and in the concentration data of characteristic gas generated by oil body collected by the sampling point of the riser in the preset time, and characteristic gas concentration data and position parameter are substituted into the diffusion characteristic function, match the fault gas concentration, oil temperature and oil flow speed corresponding to riser data, complete the feedback of transformer riser data by the monitoring of characteristic gas migration;The application designs transformer riser scale-down experiment platform according to the same principle of internal flow field distribution of the transformer riser to be measured, and can accurately reflect the gas characteristic concentration in transformer riser under different time, different working conditions according to the obtained diffusion characteristic function, by monitoring the migration of characteristic gas, improve the acquisition accuracy of transformer riser operation data.

Description

Technical Field

[0001] This invention relates to the field of transformer oil detection technology, and in particular to a method, apparatus, terminal equipment, and medium for monitoring the migration of characteristic gases. Background Technology

[0002] As a critical channel for winding outgoing lines, the riser or terminal box of a large transformer is characterized by large lead current, high electric field, and complex distribution. In the riser of a large transformer, the difficulty or delay in the diffusion of fault characteristic gases can also make it difficult for faults to be detected in a timely manner by online or offline dissolved gas in oil diagnostic technologies, seriously endangering the safe operation of the transformer.

[0003] The prior art document, "An apparatus and method for determining the diffusion rate of characteristic gases in transformer faults" (CN111024555A), proposes injecting characteristic gases into transformer oil at one end of a test container and extracting dissolved gas analysis from the other end. If the characteristic gases are detected, their diffusion rate can be calculated using the length of the test container and the shortest time for their appearance. However, this method is overly simplistic and fails to adequately consider the actual oil flow characteristics inside the transformer and the characteristics of the riser block. This results in low accuracy in assessing the migration characteristics of gas components within the transformer oil, making it difficult to accurately reflect transformer operating data. Consequently, the monitoring accuracy of characteristic gas migration is low, leading to inaccurate acquisition of current transformer riser block operating data.

[0004] Therefore, there is an urgent need for a monitoring strategy for the migration of characteristic gases to solve the problem of inaccurate acquisition of current transformer riser operation data. Summary of the Invention

[0005] This invention provides a method, apparatus, terminal equipment, and medium for monitoring characteristic gas migration, in order to improve the accuracy of acquiring transformer riser operating data.

[0006] To address the above problems, one embodiment of the present invention provides a method for monitoring the migration of characteristic gases, comprising:

[0007] The location parameters of the sampling point of the riser seat of the transformer under test are obtained, as well as the characteristic gas concentration data of the oil generated by the sampling point of the riser seat within a preset time.

[0008] Based on the position parameters, the characteristic gas concentration data, and the preset diffusion characteristic function, the riser data corresponding to the characteristic gas concentration data and the position parameters is matched; wherein, the riser data includes: fault gas concentration, oil temperature, and oil flow rate;

[0009] The method for constructing the diffusion characteristic function includes:

[0010] In a pre-set transformer riser scaling experimental platform, test data on the change of characteristic gas concentration at the sampling location over time, corresponding to the sample operating conditions collected by the acquisition device, are obtained; wherein, the sample operating conditions include: several sets of fault gas concentrations, oil temperature, oil flow velocity, and sampling locations set by orthogonal method; the pre-set transformer riser scaling experimental platform has the same internal flow field distribution as the riser of the transformer under test, and the pre-set transformer riser scaling experimental platform is constructed by scaling the size parameters of the riser of the transformer under test;

[0011] The experimental data is transmitted to a computer terminal for fitting analysis to obtain the diffusion characteristic function.

[0012] As an improvement to the above scheme, the preset transformer height reduction ratio experimental platform includes: a vacuum pump, a high-voltage lead, an oil tank, a pressure gauge, an observation window, a flange, a first oil passage, a second oil passage, a bellows, an oil pump, a flow meter, an oil injection tank, a syringe, a ring, and a sampling hole; wherein, the syringe includes either an injection syringe or a sampling syringe; the first oil passage is connected to the high-voltage lead, the oil tank, the pressure gauge, the observation window, the flange, the syringe, the ring, and the sampling hole respectively; the vacuum pump is connected to the oil tank; the second oil passage is connected to the bellows, the oil pump, the flow meter, and the oil injection tank respectively.

[0013] As an improvement to the above scheme, before acquiring the experimental data on the change of characteristic gas concentration at the sampling location over time corresponding to the sample operating conditions collected by the acquisition device, the method further includes: determining the ratio between the flow velocity in the pipe below the transformer riser scaling experimental platform and the flow velocity in the pipe below the transformer riser under test.

[0014] When the internal flow field distribution of the preset transformer riser scaling experimental platform is the same as that of the transformer riser under test, the first flow velocity and the second flow velocity of the pipe below the transformer riser under test are obtained.

[0015] The flow rate ratio is calculated using fluid dynamics calculations based on the first flow rate and the second flow rate.

[0016] When the ratio is equal to the flow rate ratio, it is determined that the internal flow field distribution of the preset transformer riser scaling test platform is the same as that of the riser of the transformer under test, and the test data is acquired.

[0017] If the ratio is not equal to the flow rate ratio, it is determined that the internal flow field distribution of the preset transformer riser scaling experimental platform and the transformer riser under test is different, and the ratio between the flow rate of the transformer riser scaling experimental platform and the flow rate of the transformer riser under test is re-evaluated.

[0018] As an improvement to the above scheme, before acquiring the experimental data on the change of characteristic gas concentration at the sampling location over time corresponding to the sample operating conditions collected by the acquisition device, the method further includes:

[0019] The preset transformer height reduction ratio experimental platform uses the vacuum pump to perform vacuum treatment on the first oil passage and the second oil passage. After the vacuum treatment is completed, the oil filling operation is performed on the first oil passage and the second oil passage using the oil filling tank.

[0020] After the oil injection operation is completed, the preset transformer height reduction ratio test platform uses the vacuum pump and the first oil passage and the second oil passage of the oil pump for circulation degassing.

[0021] After a first preset time, the preset transformer height reduction ratio experimental platform uses the vacuum pump to perform vacuum treatment on the first oil passage and the second oil passage.

[0022] As an improvement to the above scheme, the fault gas concentration includes: discharge gas concentration and artificially prepared gas concentration.

[0023] The improved scheme of this embodiment, which involves acquiring the location parameters of the sampling point of the riser seat of the transformer under test, and the characteristic gas concentration data of the oil generated by the sampling point of the riser seat within a preset time period, includes:

[0024] Obtain the location parameters of the sampling point on the riser of the transformer under test;

[0025] Based on the location parameters of the sampling point, control data for the acquisition device is generated so that the acquisition device can collect oil at the sampling point of the riser of the transformer under test according to the control data, and obtain the characteristic gas concentration data generated by the oil collected within a preset time based on oil chromatography analysis.

[0026] Receive characteristic gas concentration data transmitted by the acquisition device.

[0027] As an improvement to the above scheme, after matching the elevation data corresponding to the characteristic gas concentration data and the position parameters, the method further includes:

[0028] Based on the obtained fault gas concentration, oil temperature, and oil flow rate, and through the preset dissolved gas analysis and judgment guidelines in transformer oil, the fault type of the transformer corresponding to the fault gas concentration, oil temperature, and oil flow rate is obtained; wherein, the fault type includes: fault location and fault severity.

[0029] Accordingly, one embodiment of the present invention also provides a monitoring device for the migration of characteristic gases, including: a data acquisition module and a data matching module;

[0030] The data acquisition module is used to acquire the location parameters of the sampling point of the riser seat of the transformer under test, as well as the characteristic gas concentration data of the oil generated by the sampling point of the riser seat within a preset time.

[0031] The data matching module is used to match the riser data corresponding to the characteristic gas concentration data and the position parameters according to the position parameters, the characteristic gas concentration data and the preset diffusion characteristic function; wherein, the riser data includes: fault gas concentration, oil temperature and oil flow rate;

[0032] The method for constructing the diffusion characteristic function includes:

[0033] In a pre-set transformer riser scaling experimental platform, test data on the change of characteristic gas concentration at the sampling location over time, corresponding to the sample operating conditions collected by the acquisition device, are obtained; wherein, the sample operating conditions include: several sets of fault gas concentrations, oil temperature, oil flow velocity, and sampling locations set by orthogonal method; the pre-set transformer riser scaling experimental platform has the same internal flow field distribution as the riser of the transformer under test, and the pre-set transformer riser scaling experimental platform is constructed by scaling the size parameters of the riser of the transformer under test;

[0034] The experimental data is transmitted to a computer terminal for fitting analysis to obtain the diffusion characteristic function.

[0035] As an improvement to the above scheme, the preset transformer height reduction ratio experimental platform includes: a vacuum pump, a high-voltage lead, an oil tank, a pressure gauge, an observation window, a flange, a first oil passage, a second oil passage, a bellows, an oil pump, a flow meter, an oil injection tank, a syringe, a ring, and a sampling hole; wherein, the syringe includes either an injection syringe or a sampling syringe; the first oil passage is connected to the high-voltage lead, the oil tank, the pressure gauge, the observation window, the flange, the syringe, the ring, and the sampling hole respectively; the vacuum pump is connected to the oil tank; the second oil passage is connected to the bellows, the oil pump, the flow meter, and the oil injection tank respectively.

[0036] As an improvement to the above scheme, before acquiring the experimental data on the change of characteristic gas concentration at the sampling location over time corresponding to the sample operating conditions collected by the acquisition device, the method further includes: determining the ratio between the flow velocity in the pipe below the transformer riser scaling experimental platform and the flow velocity in the pipe below the transformer riser under test.

[0037] When the internal flow field distribution of the preset transformer riser scaling experimental platform is the same as that of the transformer riser under test, the first flow velocity and the second flow velocity of the pipe below the transformer riser under test are obtained.

[0038] The flow rate ratio is calculated using fluid dynamics calculations based on the first flow rate and the second flow rate.

[0039] When the ratio is equal to the flow rate ratio, it is determined that the internal flow field distribution of the preset transformer riser scaling test platform is the same as that of the riser of the transformer under test, and the test data is acquired.

[0040] If the ratio is not equal to the flow rate ratio, it is determined that the internal flow field distribution of the preset transformer riser scaling experimental platform and the transformer riser under test is different, and the ratio between the flow rate of the transformer riser scaling experimental platform and the flow rate of the transformer riser under test is re-evaluated.

[0041] As an improvement to the above scheme, before acquiring the experimental data on the change of characteristic gas concentration at the sampling location over time corresponding to the sample operating conditions collected by the acquisition device, the method further includes:

[0042] The preset transformer height reduction ratio experimental platform uses the vacuum pump to perform vacuum treatment on the first oil passage and the second oil passage. After the vacuum treatment is completed, the oil filling operation is performed on the first oil passage and the second oil passage using the oil filling tank.

[0043] After the oil injection operation is completed, the preset transformer height reduction ratio test platform uses the vacuum pump and the first oil passage and the second oil passage of the oil pump for circulation degassing.

[0044] After a first preset time, the preset transformer height reduction ratio experimental platform uses the vacuum pump to perform vacuum treatment on the first oil passage and the second oil passage.

[0045] As an improvement to the above scheme, the fault gas concentration includes: discharge gas concentration and artificially prepared gas concentration.

[0046] The improved scheme of this embodiment includes a data acquisition module comprising: a data acquisition unit, a data control unit, and a data receiving unit;

[0047] The data acquisition unit is used to acquire the position parameters of the sampling point of the riser seat of the transformer under test;

[0048] The data control unit is used to generate acquisition device control data according to the location parameters of the sampling point, so that the acquisition device can collect oil at the sampling point of the riser of the transformer under test according to the acquisition device control data, and obtain the characteristic gas concentration data generated by the oil collected within a preset time based on oil chromatography analysis.

[0049] The data receiving unit is used to receive characteristic gas concentration data transmitted by the acquisition device.

[0050] As an improvement to the above scheme, after matching the riser data corresponding to the characteristic gas concentration data and the position parameters, the scheme further includes: a fault judgment module;

[0051] The fault judgment module is used to obtain the fault type of the transformer corresponding to the fault gas concentration, oil temperature and oil flow rate based on the matched fault gas concentration, oil temperature and oil flow rate, and through the preset dissolved gas analysis and judgment guidelines in transformer oil; wherein, the fault type includes: fault location and fault degree.

[0052] Accordingly, one embodiment of the present invention also provides a computer terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor executes the computer program to implement a method for monitoring the migration of a characteristic gas as described in the present invention.

[0053] Accordingly, one embodiment of the present invention also provides a computer-readable storage medium, the computer-readable storage medium including a stored computer program, wherein, when the computer program is executed, it controls the device where the computer-readable storage medium is located to perform a monitoring method for the migration of characteristic gases as described in the present invention.

[0054] As can be seen from the above, the present invention has the following beneficial effects:

[0055] This invention provides a method for monitoring characteristic gas migration. It acquires the location parameters of the sampling point at the riser of the transformer under test, as well as the characteristic gas concentration data generated by the oil body collected at the sampling point within a preset time. The characteristic gas concentration data and location parameters are then substituted into a preset diffusion characteristic function to match the fault gas concentration, oil temperature, and oil flow velocity corresponding to the riser data. This achieves feedback of transformer riser data through monitoring characteristic gas migration. Based on the principle of identical internal flow field distribution in the riser of the transformer under test, this invention designs a scaled-down experimental platform for the riser. Multiple sets of fault gas concentrations, oil temperatures, oil flow velocities, and sampling locations are set using an orthogonal method, covering all possible operating conditions of the transformer riser. The method acquires experimental data corresponding to the change of characteristic gas concentration at the sampling location over time in each operating condition using acquisition equipment. The experimental data is then fitted and analyzed using a computer terminal, ensuring that the obtained diffusion characteristic function accurately reflects the gas characteristic concentration in the transformer riser under different times and operating conditions. By monitoring characteristic gas migration, the accuracy of acquiring transformer riser operating data is improved, thus facilitating fault analysis based on transformer riser operating data.

[0056] Furthermore, the oil collected from the sampling point of the transformer riser under test is analyzed by oil chromatography, which greatly improves the accuracy of characteristic gas concentration data and thus improves the accuracy of characteristic gas monitoring.

[0057] Furthermore, based on the principle of identical internal flow field distribution of the transformer riser seat, this invention designs a scaled-down experimental platform for the transformer riser seat, which can accurately simulate the actual oil flow conditions inside the transformer riser seat. This allows the scaled-down experimental platform to accurately simulate the operating conditions of the real transformer riser seat. The experimental data obtained from the scaled-down experimental platform has high accuracy, improving the accuracy of obtaining the diffusion characteristic function, thereby improving the accuracy of the conversion of transformer riser seat operating data based on characteristic gas migration. Attached Figure Description

[0058] Figure 1 This is a schematic flowchart of a method for monitoring the migration of characteristic gases according to an embodiment of the present invention;

[0059] Figure 2 This is a schematic diagram of the structure of a characteristic gas migration monitoring device provided in an embodiment of the present invention;

[0060] Figure 3 This is a schematic diagram of the structure of a transformer height-to-shortage ratio experimental platform provided in an embodiment of the present invention;

[0061] Figure 4This is a schematic diagram of the sampling hole provided in an embodiment of the present invention;

[0062] Figure 5 This is a schematic diagram of a terminal device structure provided in an embodiment of the present invention. Detailed Implementation

[0063] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0064] Example 1

[0065] See Figure 1 , Figure 1 This is a schematic flowchart of a method for monitoring the migration of characteristic gases according to an embodiment of the present invention, as shown below. Figure 1 As shown, this embodiment includes steps 101 to 102, and the specific steps are as follows:

[0066] Step 101: Obtain the location parameters of the sampling point of the riser seat of the transformer under test, and the characteristic gas concentration data of the oil generated by the sampling point of the riser seat within a preset time.

[0067] In this embodiment, acquiring the location parameters of the sampling point of the riser seat of the transformer under test, and the characteristic gas concentration data of the oil generated by the sampling point of the riser seat within a preset time period, includes:

[0068] Obtain the location parameters of the sampling point on the riser of the transformer under test;

[0069] Based on the location parameters of the sampling point, control data for the acquisition device is generated so that the acquisition device can collect oil at the sampling point of the riser of the transformer under test according to the control data, and obtain the characteristic gas concentration data generated by the oil collected within a preset time based on oil chromatography analysis.

[0070] Receive characteristic gas concentration data transmitted by the acquisition device.

[0071] In one specific embodiment, the acquisition device includes an oil body acquisition module and an oil body analysis module. The oil body acquisition module is used to collect oil body samples from the sampling point of the riser of the transformer under test. The oil body analysis module is used to analyze the oil body samples based on oil chromatography to obtain characteristic gas concentration data generated by the oil body within a preset time.

[0072] Step 102: Based on the position parameters, the characteristic gas concentration data, and the preset diffusion characteristic function, match the riser data corresponding to the characteristic gas concentration data and the position parameters; wherein, the riser data includes: fault gas concentration, oil temperature, and oil flow rate;

[0073] The method for constructing the diffusion characteristic function includes:

[0074] In a pre-set transformer riser scaling experimental platform, test data on the change of characteristic gas concentration at the sampling location over time, corresponding to the sample operating conditions collected by the acquisition device, are obtained; wherein, the sample operating conditions include: several sets of fault gas concentrations, oil temperature, oil flow velocity, and sampling locations set by orthogonal method; the pre-set transformer riser scaling experimental platform has the same internal flow field distribution as the riser of the transformer under test, and the pre-set transformer riser scaling experimental platform is constructed by scaling the size parameters of the riser of the transformer under test;

[0075] The experimental data is transmitted to a computer terminal for fitting analysis to obtain the diffusion characteristic function.

[0076] In one specific embodiment, a computer is used to fit and analyze the experimental data to obtain the gas diffusion characteristic function f(x, T, L, v, t). Based on this function, the online monitoring of actual transformer oil chromatography can be optimized. For example, if the distance L between the actual transformer riser oil chromatography sampling point and the riser is known, substituting it into the diffusion characteristic function can yield the concentration of fault gas within the actual riser, allowing for an understanding of the fault gas diffusion characteristics at that location and providing a reference for operation and maintenance.

[0077] In this embodiment, the preset transformer height reduction ratio experimental platform includes: a vacuum pump, a high-voltage lead, an oil tank, a pressure gauge, an observation window, a flange, a first oil passage, a second oil passage, a bellows, an oil pump, a flow meter, an oil injection tank, a syringe, a ring, and a sampling hole; wherein, the syringe includes either an injection syringe or a sampling syringe; the first oil passage is connected to the high-voltage lead, the oil tank, the pressure gauge, the observation window, the flange, the syringe, the ring, and the sampling hole respectively; the vacuum pump is connected to the oil tank; the second oil passage is connected to the bellows, the oil pump, the flow meter, and the oil injection tank respectively.

[0078] In a specific embodiment, for a better illustration of the structure of the transformer height-to-shortage ratio experimental platform, please refer to [link to relevant documentation]. Figure 3 :

[0079] Vacuum pump 1 is used to evacuate the test device before and during oil filling to prevent the generation of air bubbles;

[0080] High-voltage lead 2 is used to generate electric field conditions;

[0081] Oil tank 3 is used to prevent transformer oil from entering the vacuum pump; during the oil filling process, a small amount of residual gas in the device is introduced into the oil tank to prevent the formation of air bubbles; the valve at the bottom of the oil tank is closed when the oil level exceeds one-third of the tank height.

[0082] Pressure gauge 4 is used to measure the pressure inside the device during vacuuming;

[0083] Observation window 5 is used to observe the gas production and impurity particle aggregation near the pressure equalization ball;

[0084] The flange is used to assemble the riser, making the riser detachable and facilitating other related experiments, such as the L-shaped riser.

[0085] The first oil passage 7 is rectangular, which is closer to the structure and oil flow of the lower part of the actual transformer riser.

[0086] The second oil passage 8 is circular, which facilitates the installation of equipment such as bellows, oil pumps, and pressure gauges;

[0087] Bellows 9 is used to regulate oil pressure (oil pressure is mainly affected by transformer oil temperature and gas production);

[0088] The oil pump 10 is used to regulate the oil flow rate in the first oil passage by controlling the flow rate;

[0089] Flow meter 11 is used to count the flow rate in the second oil passage;

[0090] Oil filling tank 12 is used to inject transformer oil. It is placed at the bottom of the pipeline to avoid the formation of air bubbles.

[0091] Needle 13, the needle including one of an injection needle or a sampling needle, is used to inject air into or sample the inside of the transformer riser.

[0092] Ring 14 is used to discharge oil.

[0093] Sampling port 15 is used to connect sampling equipment.

[0094] In one specific embodiment, the sampling port employs a nut structure and is sealed with a silicone gasket. After the experiment, a sampling device is used to collect a sample. For a better illustration of the sampling port structure, please refer to [link to relevant documentation]. Figure 4 The sampling hole nut structure makes it easy to replace the silicone pad. The structure is simple and can ensure the sealing during the experiment and facilitate the collection of oil samples after the experiment.

[0095] In one specific embodiment, the oil flow velocity in the lower pipeline of the transformer is adjustable, and the oil passage is located below the riser seat, which is basically consistent with the oil flow conditions of the riser seat in an actual transformer. The transformer riser seat scaling experimental platform simulates the oil flow conditions of the lower part and inside of the actual transformer riser seat, taking into account the influence of oil flow, temperature and other factors on the migration of characteristic gases.

[0096] In one specific embodiment, the transformer riser scaling experimental platform simulates the actual structure of a 220kV transformer riser through high-voltage leads; the high-voltage bushing is connected to a 50kV power frequency voltage, which can generate electric field conditions similar to those inside the 220kV transformer riser, while saving oil consumption, reducing costs, and facilitating multiple experiments.

[0097] Preferably, the platform allows for experimental analysis of the effects of different factors (fault gas concentration, temperature, oil flow) on diffusion, providing a basis for optimizing online monitoring of transformer oil chromatography. A monitoring system for observing the bubble aggregation process is constructed, with transparent plexiglass windows installed before and after the equalizing sphere to facilitate observation of gas generation and bubble diffusion. The imaging equipment uses a high-speed camera, which communicates with a computer via shielded twisted-pair cable, allowing real-time observation of bubble movement.

[0098] In this embodiment, before acquiring the experimental data on the change of characteristic gas concentration at the sampling location over time corresponding to the sample operating conditions collected by the acquisition device, the method further includes: determining the ratio between the flow velocity in the pipe below the transformer riser scaling experimental platform and the flow velocity in the pipe below the transformer riser under test.

[0099] When the internal flow field distribution of the preset transformer riser scaling experimental platform is the same as that of the transformer riser under test, the first flow velocity and the second flow velocity of the pipe below the transformer riser under test are obtained.

[0100] The flow rate ratio is calculated using fluid dynamics calculations based on the first flow rate and the second flow rate.

[0101] When the ratio is equal to the flow rate ratio, it is determined that the internal flow field distribution of the preset transformer riser scaling test platform is the same as that of the riser of the transformer under test, and the test data is acquired.

[0102] If the ratio is not equal to the flow rate ratio, it is determined that the internal flow field distribution of the preset transformer riser scaling experimental platform and the transformer riser under test is different, and the ratio between the flow rate of the transformer riser scaling experimental platform and the flow rate of the transformer riser under test is re-evaluated.

[0103] In a specific embodiment, the equivalence of the oil flow inside the scaled-down riser platform with that of the actual size riser platform was verified using fluid calculations. When the ratio of the flow velocity in the pipe below the actual riser platform to that in the scaled-down riser platform was approximately 1:2, the flow field distribution inside the scaled-down riser platform was basically consistent with that of the actual size riser platform. Currently, the actual flow velocity in the transformer body in China is generally below 0.33 m / s, with an average velocity of approximately 0.2 m / s. Therefore, the oil flow velocity range studied in the scaled-down transformer riser platform experimental platform is 0–0.60 m / s, and a centrifugal adjustable-speed circulating oil pump is used.

[0104] In this embodiment, before acquiring the experimental data on the change of characteristic gas concentration at the sampling location over time corresponding to the sample operating conditions collected by the acquisition device, the method further includes:

[0105] The preset transformer height reduction ratio experimental platform uses the vacuum pump to perform vacuum treatment on the first oil passage and the second oil passage. After the vacuum treatment is completed, the oil filling operation is performed on the first oil passage and the second oil passage using the oil filling tank.

[0106] After the oil injection operation is completed, the preset transformer height reduction ratio test platform uses the vacuum pump and the first oil passage and the second oil passage of the oil pump for circulation degassing.

[0107] After a first preset time, the preset transformer height reduction ratio experimental platform uses the vacuum pump to perform vacuum treatment on the first oil passage and the second oil passage.

[0108] In one specific embodiment, before acquiring the test data of the characteristic gas concentration corresponding to the sample operating condition collected by the acquisition device changing with time at the sampling location, the transformer height reduction ratio test platform is filled with oil, the platform is evacuated, insulating oil is injected, and after the vacuum oil filling is completed, the platform is evacuated and circulated for one hour, then the oil pump is turned off and the platform is placed in a vacuum state for one hour to remove as much air as possible from the oil.

[0109] In this embodiment, the fault gas concentration includes: the gas concentration obtained by discharge and the concentration of artificially prepared gas.

[0110] In a specific embodiment, the study of the influence of multiple factors generally adopts the orthogonal method to design experiments for multiple factors, determine the experimental conditions, and conduct experimental research according to the combination obtained by the modified method to cover all factors.

[0111] If artificial preparation is used, the concentration of the artificially prepared gas should be selected from three levels: high, medium, and low (adjustable according to the user's experimental requirements); the oil temperature should be selected from three levels: low, normal load, and high load, based on the actual operating load of the transformer (adjustable according to the user's experimental requirements); and the flow velocity should be selected from four levels, ranging from 0 to 0.6 m / s (adjustable according to the user's experimental requirements). The distances from the three sampling points to the gas diffusion source point of the riser are set as L1, L2, and L3. If the artificially prepared oil sample is tested in the laboratory, 14 sets of operating conditions are obtained using the orthogonal design method, as shown in Table 1 below:

[0112]

[0113] Table 1

[0114] The diffusion of gas components during a discharge fault was analyzed using the discharge method. It was determined that the concentration generated by the discharge was a random quantity, and the gas concentration during the discharge method could be determined by sampling to be x4. Assuming the magnitudes of gas influencing factors remained constant, the experimental conditions obtained using the orthogonal method are shown in Table 2 below.

[0115]

[0116] Table 2

[0117] In one specific embodiment, the origin is taken as the location of the equalizing ball on the sleeve corresponding to the riser seat. This is because this location is considered a high-risk area for failure and can be regarded as the source of characteristic gas generation.

[0118] In this embodiment, after matching the elevation data corresponding to the characteristic gas concentration data and the position parameters, the method further includes:

[0119] Based on the obtained fault gas concentration, oil temperature, and oil flow rate, and through the preset dissolved gas analysis and judgment guidelines in transformer oil, the fault type of the transformer corresponding to the fault gas concentration, oil temperature, and oil flow rate is obtained; wherein, the fault type includes: fault location and fault severity.

[0120] In a specific embodiment, after obtaining the actual concentration, the existing technology has disclosed that the dissolved gas in transformer oil can be used to judge the internal fault. This embodiment lays the foundation for accurate judgment of the fault type by accurately deriving the fault gas concentration, oil temperature and oil flow rate.

[0121] This embodiment acquires the location parameters of the sampling point of the transformer riser under test, as well as the characteristic gas concentration data generated by the oil body collected at the sampling point of the riser within a preset time. The characteristic gas concentration data and location parameters are then substituted into a preset diffusion characteristic function to match the fault gas concentration, oil temperature, and oil flow velocity corresponding to the riser data. This completes the feedback of transformer riser data through monitoring the migration of characteristic gases. Based on the principle of identical internal flow field distribution in the riser of the transformer under test, this invention designs a scaled-down experimental platform for the transformer riser. Multiple sets of fault gas concentrations, oil temperatures, oil flow velocities, and sampling locations are set using an orthogonal method, covering all possible operating conditions of the transformer riser. The acquisition equipment collects experimental data corresponding to the change of characteristic gas concentration at the sampling location over time in each operating condition. The experimental data is then fitted and analyzed by a computer terminal, enabling the obtained diffusion characteristic function to accurately reflect the gas characteristic concentration in the transformer riser under different times and operating conditions. By monitoring the migration of characteristic gases, the accuracy of acquiring transformer riser operating data is improved, thus facilitating fault analysis based on transformer riser operating data. This allows for more targeted research on gas diffusion within the transformer riser, simulation of fault occurrence processes within the riser, and provides important reference for improving oil circulation conditions in transformer risers. It also enables targeted research on long oil gap faults within transformer risers, studying the fault occurrence mechanism of long oil gaps, and finding evidence of the causes of long oil gap discharge faults in transformers.

[0122] Example 2

[0123] See Figure 2 , Figure 2 This is a schematic diagram of the structure of a characteristic gas migration monitoring device provided in an embodiment of the present invention, including: a data acquisition module 201 and a data matching module 202;

[0124] The data acquisition module 201 is used to acquire the location parameters of the sampling point of the riser seat of the transformer under test, as well as the characteristic gas concentration data of the oil body collected by the sampling point of the riser seat within a preset time.

[0125] The data matching module 202 is used to match the riser data corresponding to the characteristic gas concentration data and the position parameters according to the position parameters, the characteristic gas concentration data and the preset diffusion characteristic function; wherein, the riser data includes: fault gas concentration, oil temperature and oil flow rate;

[0126] The method for constructing the diffusion characteristic function includes:

[0127] In a pre-set transformer riser scaling experimental platform, test data on the change of characteristic gas concentration at the sampling location over time, corresponding to the sample operating conditions collected by the acquisition device, are obtained; wherein, the sample operating conditions include: several sets of fault gas concentrations, oil temperature, oil flow velocity, and sampling locations set by orthogonal method; the pre-set transformer riser scaling experimental platform has the same internal flow field distribution as the riser of the transformer under test, and the pre-set transformer riser scaling experimental platform is constructed by scaling the size parameters of the riser of the transformer under test;

[0128] The experimental data is transmitted to a computer terminal for fitting analysis to obtain the diffusion characteristic function.

[0129] As an improvement to the above scheme, the preset transformer height reduction ratio experimental platform includes: a vacuum pump, a high-voltage lead, an oil tank, a pressure gauge, an observation window, a flange, a first oil passage, a second oil passage, a bellows, an oil pump, a flow meter, an oil injection tank, a syringe, a ring, and a sampling hole; wherein, the syringe includes either an injection syringe or a sampling syringe; the first oil passage is connected to the high-voltage lead, the oil tank, the pressure gauge, the observation window, the flange, the syringe, the ring, and the sampling hole respectively; the vacuum pump is connected to the oil tank; the second oil passage is connected to the bellows, the oil pump, the flow meter, and the oil injection tank respectively.

[0130] As an improvement to the above scheme, before acquiring the experimental data on the change of characteristic gas concentration at the sampling location over time corresponding to the sample operating conditions collected by the acquisition device, the method further includes: determining the ratio between the flow velocity in the pipe below the transformer riser scaling experimental platform and the flow velocity in the pipe below the transformer riser under test.

[0131] When the internal flow field distribution of the preset transformer riser scaling experimental platform is the same as that of the transformer riser under test, the first flow velocity and the second flow velocity of the pipe below the transformer riser under test are obtained.

[0132] The flow rate ratio is calculated using fluid dynamics calculations based on the first flow rate and the second flow rate.

[0133] When the ratio is equal to the flow rate ratio, it is determined that the internal flow field distribution of the preset transformer riser scaling test platform is the same as that of the riser of the transformer under test, and the test data is acquired.

[0134] If the ratio is not equal to the flow rate ratio, it is determined that the internal flow field distribution of the preset transformer riser scaling experimental platform and the transformer riser under test is different, and the ratio between the flow rate of the transformer riser scaling experimental platform and the flow rate of the transformer riser under test is re-evaluated.

[0135] As an improvement to the above scheme, before acquiring the experimental data on the change of characteristic gas concentration at the sampling location over time corresponding to the sample operating conditions collected by the acquisition device, the method further includes:

[0136] The preset transformer height reduction ratio experimental platform uses the vacuum pump to perform vacuum treatment on the first oil passage and the second oil passage. After the vacuum treatment is completed, the oil filling operation is performed on the first oil passage and the second oil passage using the oil filling tank.

[0137] After the oil injection operation is completed, the preset transformer height reduction ratio test platform uses the vacuum pump and the first oil passage and the second oil passage of the oil pump for circulation degassing.

[0138] After a first preset time, the preset transformer height reduction ratio experimental platform uses the vacuum pump to perform vacuum treatment on the first oil passage and the second oil passage.

[0139] As an improvement to the above scheme, the fault gas concentration includes: discharge gas concentration and artificially prepared gas concentration.

[0140] In implementing the improved scheme of this embodiment, the data acquisition module 201 includes: a data acquisition unit, a data control unit, and a data receiving unit;

[0141] The data acquisition unit is used to acquire the position parameters of the sampling point of the riser seat of the transformer under test;

[0142] The data control unit is used to generate acquisition device control data according to the location parameters of the sampling point, so that the acquisition device can collect oil at the sampling point of the riser of the transformer under test according to the acquisition device control data, and obtain the characteristic gas concentration data generated by the oil collected within a preset time based on oil chromatography analysis.

[0143] The data receiving unit is used to receive characteristic gas concentration data transmitted by the acquisition device.

[0144] As an improvement to the above scheme, after matching the elevation seat data corresponding to the characteristic gas concentration data and the position parameters, the scheme further includes: a fault judgment module 203;

[0145] The fault judgment module 203 is used to obtain the fault type of the transformer corresponding to the fault gas concentration, oil temperature and oil flow rate based on the matched fault gas concentration, oil temperature and oil flow rate, and through the preset dissolved gas analysis and judgment guidelines in transformer oil; wherein, the fault type includes: fault location and fault degree.

[0146] This embodiment acquires the location parameters of the sampling point at the riser of the transformer under test (i) and the characteristic gas concentration data generated by the oil collected at the sampling point through a data acquisition module. Based on the location parameters and characteristic gas concentration data, and combined with a preset diffusion characteristic function, riser data corresponding to the characteristic gas concentration data and the location parameters is matched. Using a preset transformer riser scaled-down experimental platform, and by setting multiple sets of fault gas concentrations, oil temperatures, oil flow velocities, and sampling locations using an orthogonal method, all possible operating conditions of the transformer riser can be covered. The acquisition device collects experimental data corresponding to the change of characteristic gas concentration at the sampling location over time in each set of operating conditions. The experimental data is then fitted and analyzed by a computer terminal, ensuring that the obtained diffusion characteristic function accurately reflects the gas characteristic concentration at different times and under different operating conditions in the transformer riser. By monitoring the migration of characteristic gases, the accuracy of acquiring transformer riser operating data is improved, thus facilitating fault analysis based on transformer riser operating data.

[0147] Example 3

[0148] See Figure 5 , Figure 5 This is a schematic diagram of the terminal device structure provided in an embodiment of the present invention.

[0149] One terminal device in this embodiment includes: a processor 501, a memory 502, and a computer program stored in the memory 502 and executable on the processor 501. When the processor 501 executes the computer program, it implements the steps of the monitoring method for the migration of the aforementioned characteristic gases in this embodiment, for example... Figure 1 All steps of the characteristic gas migration monitoring method shown. Alternatively, when the processor executes the computer program, it implements the functions of each module in the above-described device embodiments, for example: Figure 2 All modules of the characteristic gas migration monitoring device shown.

[0150] In addition, embodiments of the present invention also provide a computer-readable storage medium, the computer-readable storage medium including a stored computer program, wherein, when the computer program is executed, it controls the device where the computer-readable storage medium is located to perform the characteristic gas migration monitoring method as described in any of the above embodiments.

[0151] Those skilled in the art will understand that the schematic diagram is merely an example of a terminal device and does not constitute a limitation on the terminal device. It may include more or fewer components than shown in the diagram, or combine certain components, or different components. For example, the terminal device may also include input / output devices, network access devices, buses, etc.

[0152] The processor 501 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor. The processor 501 is the control center of the terminal device, connecting various parts of the terminal device through various interfaces and lines.

[0153] The memory 502 can be used to store the computer programs and / or modules. The processor 501 implements various functions of the terminal device by running or executing the computer programs and / or modules stored in the memory and calling the data stored in the memory 502. The memory 502 may mainly include a program storage area and a data storage area. The program storage area may store the operating system, at least one application program required for a function (such as sound playback function, image playback function, etc.), etc.; the data storage area may store data created according to the use of the mobile phone (such as audio data, phonebook, etc.). In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as hard disk, memory, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0154] Wherein, if the modules / units integrated in the terminal device are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when the computer program is executed by a processor, it can implement the steps of the various method embodiments described above. Wherein, the computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form, etc. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, portable hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc.

[0155] It should be noted that the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, in the accompanying drawings of the device embodiments provided by this invention, the connection relationships between modules indicate that they have communication connections, which can be specifically implemented as one or more communication buses or signal lines. Those skilled in the art can understand and implement this without any creative effort.

[0156] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for monitoring the migration of a characteristic gas, characterized in that, include: The location parameters of the sampling point of the riser seat of the transformer under test are obtained, as well as the characteristic gas concentration data of the oil generated by the sampling point of the riser seat within a preset time. Based on the position parameters, the characteristic gas concentration data, and the preset diffusion characteristic function, the riser data corresponding to the characteristic gas concentration data and the position parameters is matched; wherein, the riser data includes: fault gas concentration, oil temperature, and oil flow rate; The method for constructing the diffusion characteristic function includes: In a pre-designed transformer riser scaling experimental platform, experimental data on the variation of characteristic gas concentration at the sampling location over time, corresponding to sample operating conditions collected by the acquisition device, are obtained. The sample operating conditions include several sets of fault gas concentrations, oil temperatures, oil flow velocities, and sampling locations set using an orthogonal method. The pre-designed transformer riser scaling experimental platform has the same internal flow field distribution as the riser of the transformer under test, and the pre-designed transformer riser scaling experimental platform is constructed by scaling the dimensional parameters of the riser of the transformer under test. The preset transformer height-to-shortage ratio experimental platform includes: a vacuum pump, a high-voltage lead, an oil tank, a pressure gauge, an observation window, a flange, a first oil passage, a second oil passage, a bellows, an oil pump, a flow meter, an oil filling tank, a syringe, a ring, and a sampling hole; wherein, the first oil passage is connected to the high-voltage lead, the oil tank, the pressure gauge, the observation window, the flange, the syringe, the ring, and the sampling hole; the vacuum pump is connected to the oil tank; the second oil passage is connected to the bellows, the oil pump, the flow meter, and the oil filling tank. The experimental data is transmitted to a computer terminal for fitting analysis to obtain the diffusion characteristic function.

2. The method for monitoring the migration of characteristic gases according to claim 1, characterized in that, Before acquiring experimental data on the change of characteristic gas concentration at the sampling location over time corresponding to the sample operating conditions collected by the acquisition device, the method further includes: determining the ratio between the flow velocity in the pipe below the transformer riser scaling test platform and the flow velocity in the pipe below the transformer riser under test. When the internal flow field distribution of the preset transformer riser scaling experimental platform is the same as that of the transformer riser under test, the first flow velocity and the second flow velocity of the pipe below the transformer riser under test and the transformer riser scaling experimental platform are obtained. The flow rate ratio is calculated using fluid dynamics calculations based on the first flow rate and the second flow rate. When the ratio is equal to the flow rate ratio, it is determined that the internal flow field distribution of the preset transformer riser scaling test platform is the same as that of the riser of the transformer under test, and the test data is acquired. If the ratio is not equal to the flow rate ratio, it is determined that the internal flow field distribution of the preset transformer riser scaling experimental platform and the transformer riser under test is different, and the ratio between the flow rate of the transformer riser scaling experimental platform and the flow rate of the transformer riser under test is re-evaluated.

3. The method for monitoring the migration of characteristic gases according to claim 2, characterized in that, Before acquiring the experimental data on the change of characteristic gas concentration at the sampling location over time corresponding to the sample operating conditions collected by the acquisition device, the method further includes: The preset transformer height reduction ratio experimental platform uses the vacuum pump to perform vacuum treatment on the first oil passage and the second oil passage. After the vacuum treatment is completed, the oil filling operation is performed on the first oil passage and the second oil passage using the oil filling tank. After the oil injection operation is completed, the preset transformer height reduction ratio test platform uses the vacuum pump and the first oil passage and the second oil passage of the oil pump for circulation degassing. After a first preset time, the preset transformer height reduction ratio experimental platform uses the vacuum pump to perform vacuum treatment on the first oil passage and the second oil passage.

4. The method for monitoring the migration of characteristic gases according to claim 3, characterized in that, The fault gas concentration includes: the gas concentration obtained by discharge and the concentration of artificially prepared gas.

5. The method for monitoring the migration of characteristic gases according to claim 3, characterized in that, The acquisition of the location parameters of the sampling point of the riser seat of the transformer under test, and the characteristic gas concentration data of the oil generated by the sampling point of the riser seat within a preset time period, includes: Obtain the location parameters of the sampling point on the riser of the transformer under test; Based on the location parameters of the sampling point, control data for the acquisition device is generated so that the acquisition device can collect oil at the sampling point of the riser of the transformer under test according to the control data, and obtain the characteristic gas concentration data generated by the oil collected within a preset time based on oil chromatography analysis. Receive characteristic gas concentration data transmitted by the acquisition device.

6. The method for monitoring the migration of characteristic gases according to claim 3, characterized in that, After matching the elevation data corresponding to the characteristic gas concentration data and the position parameters, the method further includes: Based on the obtained fault gas concentration, oil temperature, and oil flow rate, and through the preset dissolved gas analysis and judgment guidelines in transformer oil, the fault type of the transformer corresponding to the fault gas concentration, oil temperature, and oil flow rate is obtained; wherein, the fault type includes: fault location and fault severity.

7. A device for monitoring the migration of a characteristic gas, characterized in that, include: Data acquisition module and data matching module; The data acquisition module is used to acquire the location parameters of the sampling point of the riser seat of the transformer under test, as well as the characteristic gas concentration data of the oil generated by the sampling point of the riser seat within a preset time. The data matching module is used to match the riser data corresponding to the characteristic gas concentration data and the position parameters according to the position parameters, the characteristic gas concentration data and the preset diffusion characteristic function; wherein, the riser data includes: fault gas concentration, oil temperature and oil flow rate; The method for constructing the diffusion characteristic function includes: In a pre-designed transformer riser scaling experimental platform, experimental data on the variation of characteristic gas concentration at the sampling location over time, corresponding to sample operating conditions collected by the acquisition device, are obtained. The sample operating conditions include several sets of fault gas concentrations, oil temperatures, oil flow velocities, and sampling locations set using an orthogonal method. The pre-designed transformer riser scaling experimental platform has the same internal flow field distribution as the riser of the transformer under test, and the pre-designed transformer riser scaling experimental platform is constructed by scaling the dimensional parameters of the riser of the transformer under test. The preset transformer height-to-shortage ratio experimental platform includes: a vacuum pump, a high-voltage lead, an oil tank, a pressure gauge, an observation window, a flange, a first oil passage, a second oil passage, a bellows, an oil pump, a flow meter, an oil filling tank, a syringe, a ring, and a sampling hole; wherein, the first oil passage is connected to the high-voltage lead, the oil tank, the pressure gauge, the observation window, the flange, the syringe, the ring, and the sampling hole; the vacuum pump is connected to the oil tank; the second oil passage is connected to the bellows, the oil pump, the flow meter, and the oil filling tank. The experimental data is transmitted to a computer terminal for fitting analysis to obtain the diffusion characteristic function.

8. A computer terminal device, characterized in that, The device includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor, when executing the computer program, implements a method for monitoring the migration of a characteristic gas as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored computer program, wherein, when the computer program is executed, it controls the device containing the computer-readable storage medium to perform a method for monitoring the migration of a characteristic gas as described in any one of claims 1 to 6.

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