Experimental device and method for dynamic process of gas in transformer oil

Abstract

The invention relates to the technical field of high-voltage power transformation devices, and provides a dynamic process experiment device and method for gas in transformer oil. Comprising an experiment cavity for accommodating transformer oil; the temperature field loading module is thermally coupled with the experimental cavity and is used for applying a controllable temperature field to the transformer oil; the gas control module is integrated in the experimental cavity and is used for injecting experimental gas into the transformer oil and controlling a diffusion path of the experimental gas; the electric field loading module penetrates through the experiment cavity and is used for forming a high-voltage electric field in the transformer oil; and the image acquisition module is used for acquiring gas dissolution and diffusion pictures in the transformer oil. Gas dissolution and diffusion behaviors under the multi-physical field coupling action of high voltage, large current, high temperature, high voltage, flow velocity and the like can be automatically and accurately simulated, and a more accurate theoretical basis is provided for transformer fault diagnosis.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of high-voltage power transformation devices, in particular to a transformer oil gas dynamic process experimental device and method. BACKGROUND

[0002] Oil-immersed transformers are core equipment in power systems, bearing important functions of voltage transformation, power distribution and transmission, and their operation state is directly related to the safety and stability of power grids. However, due to long-term operation, environmental factors and internal insulation material aging, etc., oil-immersed transformers may have partial overheating, discharge and other faults, and even cause equipment damage or power grid accidents in severe cases. According to statistics, most of the transformer faults are related to the insulation system, and the insulation system of the oil-immersed transformer is mainly composed of transformer oil and solid insulation materials. Transformer oil is not only an insulating medium, but also bears the functions of heat dissipation and fault characteristic gas transmission. Therefore, it is of great significance to study the physical and chemical properties of transformer oil, especially the behavior of dissolved gas in oil, for transformer fault diagnosis and prevention.

[0003] During the operation of the oil-immersed transformer, due to the thermal decomposition of the insulation material, corona discharge or arc discharge and other faults, a variety of characteristic gases (such as H2, CH4, C2H2, C2H4, C2H6, CO, CO2) will be generated. These gases are dissolved in transformer oil and transmitted in the oil through the diffusion process. The type, concentration and diffusion characteristics of the dissolved gas in the oil are important basis for transformer fault diagnosis. At present, dissolved gas analysis (DGA) is one of the main methods for transformer fault diagnosis. However, the accuracy of DGA technology depends on the in-depth understanding of the gas dissolution and diffusion process. For example, the diffusion coefficient of gas in oil is affected by temperature, electric field, decomposition characteristics and other factors.

[0004] However, the existing research methods have problems in revealing the mechanism of multi-physical field coupling. Experimental research is limited by single variable control (such as only adjusting temperature or static electric field), and cannot restore the synergistic effect of temperature field, electric field and flow field under the real working condition of the transformer; theoretical research is difficult to establish a cross-scale gas transport dynamics model due to the lack of experimental data support.

[0005] Therefore, there is an urgent need for an experimental device and method with high precision and automation to accurately measure the diffusion characteristics of dissolved gas in transformer oil. SUMMARY

[0006] Therefore, the embodiment of the present application provides a transformer oil gas dynamic process experimental device and method, which can automatically and accurately simulate the gas dissolution and diffusion behavior under the coupling of multiple physical fields such as high voltage, large current, high temperature, high pressure and flow rate, and provide a more accurate theoretical basis for transformer fault diagnosis.

[0007] The first aspect of the embodiment of the present application provides a transformer oil gas dynamic process experimental device, comprising: An experimental cavity for accommodating transformer oil; A temperature field loading module, which is thermally coupled with the experimental cavity, is used to apply a controllable temperature field to the transformer oil; A gas control module, which is integrated in the experimental cavity, is used to inject experimental gas into the transformer oil and control the diffusion path of the experimental gas; An electric field loading module, which penetrates the experimental cavity, is used to form a high-voltage electric field in the transformer oil; An image acquisition module for acquiring gas dissolution and diffusion pictures in the transformer oil.

[0008] In one embodiment, the temperature field loading module comprises an upper heater and a lower heater, the upper heater is arranged at the upper part of the experimental cavity, and the lower heater is arranged at the lower part of the experimental cavity.

[0009] In one embodiment, the temperature field loading module further comprises a temperature sensor arranged in the experimental cavity for detecting the temperature of the transformer oil.

[0010] In one embodiment, the gas control module comprises a gas injection pipeline, a gas exhaust pipeline, a bubble inlet pipe, a bubble outlet pipe and a bubble diffusion pipeline; The gas injection pipeline and the gas exhaust pipeline are arranged at the top and bottom of the experimental cavity respectively, the bubble inlet pipe, the bubble outlet pipe and the bubble diffusion pipeline are arranged in the experimental cavity, the gas injection pipeline is connected with one end of the bubble inlet pipe, the gas exhaust pipeline is connected with one end of the bubble outlet pipe, and the other ends of the bubble inlet pipe and the bubble outlet pipe are connected with the bubble diffusion pipeline respectively.

[0011] In one embodiment, the gas control module further comprises a controllable valve arranged in the bubble inlet pipe.

[0012] In one embodiment, the electric field loading module comprises a high-voltage electrode and a grounding electrode, the high-voltage electrode and the grounding electrode are arranged in the experimental cavity and are separately arranged on both sides of the bubble diffusion pipeline.

[0013] In an embodiment, the electric field loading module further comprises a high-voltage lead row, a ground lead row, a high-voltage lead terminal, and a ground terminal. The high-voltage lead row and the ground lead row are arranged on both sides of the experimental cavity, the high-voltage lead row is connected with the high-voltage electrode through the high-voltage lead terminal, and the ground lead row is connected with the ground electrode through the ground terminal.

[0014] In an embodiment, the inner wall of the experimental cavity is further uniformly provided with a plurality of gas concentration sensors for monitoring the gas concentration in the transformer oil.

[0015] In an embodiment, the image acquisition module comprises a camera arranged above the experimental cavity, and a lens of the camera corresponds to the experimental cavity.

[0016] In an embodiment, the experimental cavity is made of a transparent material.

[0017] The second aspect of the embodiments of the present application further provides a transformer oil gas dynamic process experiment method, which is applied to the device of the first aspect of the embodiments of the present application and comprises the following steps: Injecting transformer oil into the experimental cavity; Applying a specified temperature field to the transformer oil by the temperature field loading module; Injecting experimental gas into the transformer oil by the gas control module to form bubbles with a required size and quantity; Starting the electric field loading module to apply a high-voltage electric field to the transformer oil to simulate the operating condition of the transformer; Collecting gas dissolution and diffusion pictures by the image acquisition module; Analyzing the collected data to calculate the dissolution and diffusion coefficients of the gas in the transformer oil.

[0018] In an embodiment, the temperature data of the transformer oil is obtained by a temperature sensor, and the gas concentration data in the transformer oil is obtained by a gas concentration sensor. The analyzing the collected data to calculate the dissolution and diffusion coefficients of the gas in the transformer oil comprises analyzing the collected gas dissolution and diffusion pictures, the temperature data of the transformer oil, and the gas concentration data to calculate the dissolution and diffusion coefficients of the gas in the transformer oil.

[0019] The first aspect of the embodiment of the present application provides a dynamic process experimental device for gases in transformer oil, comprising an experimental cavity for accommodating transformer oil; a temperature field loading module, which is thermally coupled with the experimental cavity, for applying a controllable temperature field to the transformer oil; a gas control module, which is integrated in the experimental cavity, for injecting experimental gas into the transformer oil and controlling the diffusion path of the experimental gas; an electric field loading module, which penetrates through the experimental cavity, for forming a high-voltage electric field in the transformer oil; and an image acquisition module for acquiring pictures of gas dissolution and diffusion in the transformer oil. By integrating the temperature field loading module, the gas control module, the electric field loading module and the image acquisition module, a gas dynamic process experimental platform under a multi-physical field (temperature field, electric field and flow field) coupling environment is constructed. The experimental cavity accommodates the transformer oil and bears the synergistic effect of the modules, the gas control module accurately injects experimental gas and controls the diffusion path, the electric field loading module simulates a high-voltage electric field under a real operating condition of the transformer, and the image acquisition module captures micro behaviors of gas dissolution and diffusion in real time, so that the visualization observation of gas behaviors under the interaction of multiple parameters in a controllable environment is realized, and a basic experimental condition for studying the influence of multi-field coupling on gas transport mechanism is provided. The device can automatically and accurately simulate the gas dissolution and diffusion behaviors under the coupling of multiple physical fields such as high voltage, large current, high temperature, high pressure and flow rate, and provide a more accurate theoretical basis for transformer fault diagnosis.

[0020] It can be understood that the beneficial effects of the second aspect described above can be referred to the related description in the first aspect described above, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 is a structural schematic diagram of a dynamic process experimental device for gases in transformer oil provided by an embodiment of the present application; Figure 2 is a structural schematic diagram of a gas control module provided by an embodiment of the present application; In the figure: 10-image acquisition module, 20-experimental cavity, 201-transformer oil, 202-gas concentration sensor, 30-temperature field loading module, 301-upper heater, 302-lower heater, 303-temperature sensor, 40-gas control module, 401-gas injection pipeline, 402-gas exhaust pipeline, 403-bubble inlet pipe, 404-bubble outlet pipe, 405-bubble diffusion pipeline, 406-controllable valve, 50-electric field loading module, 501-high-voltage lead row, 502-grounding lead row, 503-high-voltage lead terminal, 504-grounding terminal, 505-high-voltage electrode, 506-grounding electrode. DETAILED DESCRIPTION

[0023] In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular architectures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application can be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

[0024] It is to be understood that the terminology "includes", "has", "holds", "contains" and / or "comprising", "including", "containing", "having" and / or "comprises" when used in the present specification and in the following claims, specifies the presence of stated features, integers, steps, operations, elements, and / or components but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0025] It is also to be understood that the terminology "and / or" when used in the present specification and in the following claims, refers to at least one of the items, or any combination of one or more of the items, and includes all possible combinations of the items.

[0026] In addition, in the description of the present specification and in the following claims, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating or implying relative importance.

[0027] Reference in the specification to "one embodiment" or "some embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrases "in one embodiment", "in some embodiments", "in other embodiments", "in additional embodiments", etc. in various places in the specification are not necessarily all referring to the same embodiment, although they can. The terms "comprising", "including", "having" and their variants, mean "including but not limited to", unless otherwise expressly specified and / or limited by the context.

[0028] As Figure 1 shown, the embodiment of the present application provides a dynamic process experimental device for gases in transformer oil, characterized in that it comprises: an experimental cavity 20 for accommodating transformer oil 201; a temperature field loading module 30 thermally coupled with the experimental cavity 20 for applying a controllable temperature field to the transformer oil 201; a gas control module 40 integrated in the experimental cavity 20 for injecting experimental gas into the transformer oil 201 and controlling the diffusion path of the experimental gas; an electric field loading module 50 penetrating through the experimental cavity 20 for forming a high-voltage electric field in the transformer oil 201; an image acquisition module 10 for acquiring pictures of gas dissolution and diffusion in the transformer oil 201.

[0029] The embodiment of the present application integrates the temperature field loading module, the gas control module, the electric field loading module and the image acquisition module to build a gas dynamic process experimental platform under the coupling environment of multiple physical fields (temperature field, electric field and flow field). The experimental cavity accommodates the transformer oil and bears the synergistic effect of the modules, the gas control module accurately injects experimental gas and controls the diffusion path, the electric field loading module simulates the high-voltage electric field under the real operating condition of the transformer, the image acquisition module captures the micro behavior of gas dissolution and diffusion in real time, realizes the visual observation of gas behavior under the interaction of multiple parameters in a controllable environment, and provides basic experimental conditions for studying the influence of multiple field coupling on gas transport mechanism. The device can automatically and accurately simulate the gas dissolution and diffusion behavior under the coupling of multiple physical fields such as high voltage, large current, high temperature, high pressure and flow rate, and provides a more accurate theoretical basis for transformer fault diagnosis.

[0030] In one embodiment, the temperature field loading module 30 comprises an upper heater 301 and a lower heater 302, the upper heater 301 is arranged at the upper part of the experimental cavity 20, and the lower heater 302 is arranged at the lower part of the experimental cavity 20.

[0031] In application, the upper heater 301 and the lower heater 302 are used to control the temperature of the transformer oil and simulate the temperature field inside the transformer. The upper heater 301 and the lower heater 302 are embedded in the oil tank cavity or pipeline for heating the transformer oil, and the temperature field loading module 30 further comprises a temperature control module for linkage with a temperature sensor to accurately control the oil temperature.

[0032] The application embodiment covers the upper and lower areas of the experimental cavity by the split layout of the upper and lower heaters, forming a gradient temperature field. This design simulates the spatial non-uniformity of the oil temperature of the transformer during operation (such as the bottom oil temperature being higher than the top), ensures that the temperature field loading is closer to the actual working condition, and at the same time avoids local overheating or distortion of the temperature distribution caused by a single heat source, thereby improving the accuracy of temperature control and the reliability of experimental results In one embodiment, the temperature field loading module 30 further comprises a temperature sensor 303 arranged in the experimental cavity 20 for real-time detection of the temperature of the transformer oil 201.

[0033] In the application embodiment, the temperature sensor is directly integrated in the internal of the experimental cavity, which can monitor the temperature of the transformer oil in real time and feed back to the temperature field loading module. This design realizes closed-loop control of the oil temperature, ensures the stability of the temperature field, avoids temperature drift caused by thermal inertia or environmental interference, and provides high-precision temperature parameter support for gas solubility kinetics research.

[0034] In one embodiment, the temperature field loading module 30 adopts a PID control algorithm to ensure accurate control of the temperature of the transformer oil.

[0035] In one embodiment, as shown in Figure 2 The gas control module 40 includes a gas injection pipeline 401, a gas exhaust pipeline 402, a bubble inlet pipe 403, a bubble outlet pipe 404, and a bubble diffusion pipeline 405. The gas injection pipeline 401 and the gas exhaust pipeline 402 are arranged at the top and bottom of the experimental cavity 20, respectively. The bubble inlet pipe 403, the bubble outlet pipe 404, and the bubble diffusion pipeline 405 are arranged in the experimental cavity 20. The inlet of the bubble diffusion pipeline 405 is connected with the gas injection pipeline 401 through the bubble inlet pipe 403, and the outlet of the bubble diffusion pipeline 405 is connected with the gas exhaust pipeline 402 through the bubble outlet pipe 404.

[0036] In application, the gas injection pipeline is used to inject experimental gas into the transformer oil, and is provided with a gas control valve to accurately control the gas flow. The gas exhaust pipeline is used to exhaust the gas in the experimental cavity. The bubble inlet pipe is used to guide the experimental gas into the transformer oil in the form of bubbles. The bubble outlet pipe is used to exhaust the gas in the transformer oil. The bubble diffusion pipeline is used to guide the diffusion of bubbles in the transformer oil. Among them, the gas injection pipeline and the gas exhaust pipeline are made of high-temperature-resistant and corrosion-resistant materials to ensure the reliability of long-term use.

[0037] The embodiment of the application constructs a closed circulation gas path by arranging the gas injection pipeline and the exhaust pipeline at the top and bottom of the cavity, combining the built-in bubble inlet pipe, outlet pipe and diffusion pipeline. The structure makes the bubbles diffuse along the preset path in the oil, and extend to the electric field action area through the diffusion pipeline, directly observing the influence of the electric field on the bubble trajectory, and solving the diffusion randomness problem caused by traditional single-point gas injection.

[0038] In one embodiment, a pumping pipeline is further included. The pumping pipeline is composed of a pump body, a pipeline and a flow valve. The pump body is composed of a magnetic drive gear pump for transporting transformer oil to ensure the circulation of oil in the experimental cavity. The pipeline is made of polytetrafluoroethylene material which is corrosion-resistant and high-temperature-resistant, and is connected to the experimental cavity and other components. The flow control valve is used to adjust the flow rate of the oil. The insulating oil pipeline is composed of a pipeline body and a connecting piece. The pipeline body is made of an insulating material which is high-temperature-resistant and corrosion-resistant, and is used to transport transformer oil. The connecting piece is used to ensure the tight connection of the pipeline with other components to prevent leakage.

[0039] In one embodiment, the gas control module 40 further includes a controllable valve 406, which is arranged on the bubble inlet pipe 403.

[0040] In application, the controllable valve 406 is a controllable bidirectional valve, which is used to control the injection and exhaust of gas.

[0041] The controllable valve of the embodiment of the application is installed on the bubble inlet pipe, and the gas flow is controlled by adjusting the opening of the valve to realize the dynamic regulation of the bubble size and the injection rate, meet the demand of different experimental scenarios (such as micro-bubble group or single large bubble) for gas release mode, and improve the experimental flexibility.

[0042] In one embodiment, the electric field loading module 50 includes a high-voltage electrode 505 and a grounding electrode 506, which are arranged in the experimental cavity 20 and are separately arranged on both sides of the bubble diffusion pipeline 405.

[0043] In application, the high-voltage electrode and the grounding electrode are used to form an electric field in the transformer oil.

[0044] The high-voltage electrode and the grounding electrode of the embodiment of the application are separately arranged on both sides of the bubble diffusion pipeline to form a uniform high-voltage electric field on the bubble motion path. The layout makes the electric field force directly act on the bubble surface, simulates the electric field environment of the partial discharge area in the transformer, and provides direct action conditions for studying the influence of the electric field strength on the bubble deformation, rupture and gas dissolution rate.

[0045] In one embodiment, the electric field loading module 50 further includes a high-voltage lead row 501, a grounding lead row 502, a high-voltage lead terminal 503 and a grounding terminal 504. The high-voltage lead row 501 and the ground lead row 502 are arranged separately on both sides of the experimental cavity 20, the high-voltage lead row 501 is connected with the high-voltage electrode 505 through the high-voltage lead terminal 503, and the ground lead row 502 is connected with the ground electrode 506 through the ground terminal 504. Among them, the high-voltage lead row and the ground lead row are wrapped with insulating materials to ensure the safety of the experiment process and prevent electric shock and leakage.

[0046] In application, the high-voltage lead row and the ground lead row are used to connect the high-voltage electrode 505 and the ground electrode 506 through the high-voltage lead terminal 503 and the ground terminal 504, so as to apply a high-voltage electric field in the transformer oil and simulate the electric field condition inside the transformer. The high-voltage lead terminal can be composed of oxygen-free TP copper to provide a high-voltage electric field for the electrode and simulate the operating condition of the transformer. The ground terminal is composed of oxygen-free TP copper and is used to connect the experimental device with the ground to ensure the safety of the ground of the equipment. The high-voltage electrode is composed of an electrode plate, an insulating support and a connecting terminal. The electrode plate is installed in the oil tank cavity, the insulating support is used to fix the electrode plate to ensure that it is insulated from the oil tank cavity, and the connecting terminal is used to connect with the high-voltage lead terminal to ensure the stability of the electric field.

[0047] The high-voltage lead row and the ground lead row of the embodiment of the application are arranged outside the cavity, the electrodes are connected through the lead terminals to realize the physical isolation of the inner and outer circuits. This design avoids the interference of the external circuit on the electric field distribution in the cavity, ensures the purity and repeatability of the high-voltage electric field, and facilitates the adjustment of the electrode spacing to adapt to the experimental requirements of different voltage levels.

[0048] In one embodiment, the inner wall of the experimental cavity 20 is also uniformly provided with a plurality of gas concentration sensors 202, and the gas concentration sensors 202 are used to monitor the gas concentration in the transformer oil 201.

[0049] The gas concentration sensors of the embodiment of the application are uniformly arranged on the inner wall of the experimental cavity to realize the multi-position synchronous monitoring of the gas concentration in the oil. This design captures the concentration gradient change in the gas diffusion process, provides key data for establishing a spatial non-uniform diffusion model, and makes up for the limitations of single-point detection.

[0050] In one embodiment, the image acquisition module 10 includes a camera arranged above the experimental cavity 20, and the lens of the camera corresponds to the experimental cavity 20.

[0051] In application, the camera is a high-speed CMOS camera, and the image acquisition module 10 further includes a narrow-band filter group, an adjustable macro lens, a power system and a three-axis support. The temperature sensor includes a platinum resistance sensor probe, a signal transmission line, a multi-point positioning support, an optical fiber isolation unit and a control and display unit.

[0052] The camera device of the embodiment of the application is vertically arranged above the experimental cavity, and the lens covers the whole cavity. The angle of view ensures that the bubble movement track, deformation process and dynamic response under the action of the electric field are all recorded completely, eliminates the blind area of observation, and provides undistorted original data for image analysis.

[0053] In one embodiment, the experimental cavity 20 is made of transparent material.

[0054] In application, the experimental cavity is made of transparent material, which facilitates observation of the dissolution and diffusion process of the gas in the transformer oil.

[0055] The experimental cavity of the embodiment of the application adopts transparent material (such as quartz glass), which ensures optical transmittance and image acquisition clarity. This design avoids image distortion caused by material refraction or scattering, while ensuring the insulation safety of the cavity under high-voltage electric field, and taking into account the visualization demand and experimental stability.

[0056] The embodiment of the application also provides a dynamic process experiment method of gas in transformer oil, which is applied to the device of any one of the above embodiments and includes the following steps. Step 1: Injecting transformer oil 201 into the experimental cavity 20.

[0057] In application, before step 1, it is necessary to check whether each component (image acquisition module, temperature sensor, pumping pipeline, heater, high-voltage lead end, grounding end, insulating oil pipeline, electrode, bubble guide pipe, oil tank cavity) of the experimental device is correctly installed and in normal working condition. In step 1, when transformer oil 201 is injected into the experimental cavity 20, it is necessary to ensure that the oil quantity meets the experimental requirements.

[0058] Step 2: Applying a specified temperature field to the transformer oil 201 by the temperature field loading module 30.

[0059] In application, before step 2, the high-voltage lead row and the grounding line row need to be connected to ensure the safety of the circuit. Then, the temperature field loading module and the temperature sensor are started, and the oil temperature is monitored in real time through the display and control unit to ensure that the temperature is stable at the set value, that is, a specified temperature field is applied.

[0060] Step 3: Injecting experimental gas into the transformer oil 201 through the gas control module 40 to form bubbles of the required size and quantity.

[0061] In application, the gas source is opened, experimental gas is injected into the transformer oil through the bubble inlet pipe, the gas control valve is adjusted to control the gas flow, and bubbles of the required size and quantity are formed. The experimental gas includes one or more of hydrogen (H2), methane (CH4) and acetylene (C2H2).

[0062] Step 4: Starting the electric field loading module 50 to apply a high-voltage electric field to the transformer oil 201 to simulate the operating conditions of the transformer.

[0063] In application, start the high-voltage power supply, apply a high-voltage electric field in the transformer oil through the high-voltage electrode and the grounding electrode, adjust the output voltage of the high-voltage power supply, and simulate the operating conditions of the transformer. The voltage range of the high-voltage electric field is 1 kV to 100 kV, simulating the partial discharge phenomenon inside the transformer.

[0064] Step 5, collect the gas dissolution and diffusion pictures by the image acquisition module 10.

[0065] In application, start the image acquisition module, align the observation window of the experimental cavity, capture the dynamic process of gas dissolution and diffusion in the transformer oil through the optical filter and the lens, and record the image data in the experimental process. The shooting frame rate of the image acquisition module is not less than 1000 frames / s, so as to ensure the capture of the rapid movement process of the bubbles.

[0066] Step 6, analyze the collected data and calculate the dissolution and diffusion coefficients of the gas in the transformer oil 201.

[0067] In application, the temperature data of the transformer oil 201 are also obtained by the temperature sensor 303, and the gas concentration data in the transformer oil 201 are obtained by the gas concentration sensor 202. The experimental data collected by the temperature sensor, the gas concentration sensor and the image acquisition module are analyzed, and the dissolution and diffusion coefficients of the gas in the transformer oil are calculated.

[0068] The embodiments of the present application realize the standardized experimental process of the dynamic process of the gas under the coupling of multiple fields through the time sequencing operation of the temperature field loading, the gas injection, the electric field application and the image acquisition. Based on the collaborative analysis of the image and sensor data, the dissolution and diffusion coefficients of the gas are quantified, the defects that the traditional offline detection cannot simulate the actual working conditions are solved, and the dynamic model parameters are provided for the research on the fault gas behavior of the transformer.

[0069] In one embodiment, the temperature data of the transformer oil 201 are also obtained by the temperature sensor 303, and the gas concentration data in the transformer oil 201 are obtained by the gas concentration sensor 202. Based on the collected data, the dissolution and diffusion coefficients of the gas in the transformer oil 201 are calculated, including analyzing the collected gas dissolution and diffusion pictures, the temperature data and the gas concentration data of the transformer oil 201, and calculating the dissolution and diffusion coefficients of the gas in the transformer oil 201.

[0070] The embodiments of the present application construct a multi-source data correlation analysis model by fusing the temperature data, the gas concentration data and the image information. The model corrects the concentration distribution through the temperature gradient, reverses the diffusion rate through the image trajectory, significantly improves the calculation accuracy of the gas transport parameters, and is especially suitable for the dynamic calibration of the diffusion coefficient under the coupling of complex fields.

[0071] In one embodiment, further comprising a step 7: turning off the high voltage power supply and the gas source, stopping the gas injection and the high voltage electric field application, turning off the temperature field loading module and the temperature sensor, stopping the oil temperature control, draining the transformer oil from the oil tank cavity, and cleaning the experimental device.

[0072] It should be understood that the size of the serial number of each step in the above embodiments does not mean the order of execution, and the execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0073] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A gas dynamic process experimental device in transformer oil, characterized in that: include: A test chamber (20) for containing transformer oil (201); a temperature field loading module (30), thermally coupled to the experimental cavity (20), and configured to apply a controllable temperature field to the transformer oil (201); A gas control module (40), integrated in the experimental cavity (20), for injecting experimental gas into the transformer oil (201) and controlling the diffusion path of the experimental gas; An electric field loading module (50) passes through the experimental cavity (20) and is used to form a high-voltage electric field in the transformer oil (201); The image acquisition module (10) is used to acquire images of gas dissolution and diffusion in the transformer oil (201).

2. The gas dynamic process experimental device in transformer oil according to claim 1, characterized in that: The temperature field loading module (30) comprises an upper heater (301) and a lower heater (302), wherein the upper heater (301) is arranged at the upper portion of the experimental cavity (20), and the lower heater (302) is arranged at the lower portion of the experimental cavity (20).

3. The gas dynamic process experimental device in transformer oil according to claim 1, characterized in that: The temperature field loading module (30) further includes a temperature sensor (303), which is arranged in the experimental cavity (20) and is used to detect the temperature of the transformer oil (201).

4. The gas dynamic process experimental device in transformer oil according to claim 1, characterized in that: The gas control module (40) comprises a gas injection pipeline (401), a gas discharge pipeline (402), a bubble inlet pipe (403), a bubble outlet pipe (404) and a bubble diffusion pipeline (405); The gas injection pipeline (401) and the gas exhaust pipeline (402) are respectively arranged at the top and bottom of the experimental cavity (20); the bubble inlet pipe (403), the bubble outlet pipe (404) and the bubble diffusion pipeline (405) are arranged in the experimental cavity (20); the inlet of the bubble diffusion pipeline (405) is connected to the gas injection pipeline (401) through the bubble inlet pipe (403); and the outlet of the bubble diffusion pipeline (405) is connected to the gas exhaust pipeline (402) through the bubble outlet pipe (404).

5. The gas dynamic process experimental device in transformer oil according to claim 4, characterized in that: The gas control module (40) further includes a controllable valve (406), and the controllable valve (406) is arranged on the bubble inlet pipe (403).

6. The gas dynamic process experimental device in transformer oil according to claim 4, characterized in that: The electric field loading module (50) includes a high-voltage electrode (505) and a grounding electrode (506). The high-voltage electrode (505) and the grounding electrode (506) are arranged in the experimental cavity (20) and are separately arranged on both sides of the bubble diffusion pipeline (405).

7. The gas dynamic process experimental device in transformer oil according to claim 6, characterized in that: The electric field loading module (50) further comprises a high-voltage lead row (501), a grounding row (502), a high-voltage lead terminal (503) and a grounding terminal (504); The high-voltage lead row (501) and the grounding wire row (502) are separately arranged on both sides of the experimental cavity (20), the high-voltage lead row (501) is connected to the high-voltage electrode (505) through the high-voltage lead terminal (503), and the grounding wire row (502) is connected to the grounding electrode (506) through the grounding terminal (504).

8. The gas dynamic process experimental device in transformer oil according to claim 1, characterized in that: The inner wall of the experimental cavity (20) is also evenly provided with a plurality of gas concentration sensors (202), and the gas concentration sensors (202) are used to monitor the gas concentration in the transformer oil (201).

9. The gas dynamic process experimental device in transformer oil according to claim 1, characterized in that: The image acquisition module (10) comprises a camera device arranged above the experimental cavity (20), and a lens of the camera device corresponds to the experimental cavity (20).

10. The gas dynamic process experimental device in transformer oil according to claim 1, characterized in that: The experimental cavity (20) is made of a transparent material.

11. A method for testing the dynamic process of gas in transformer oil, applied to the device according to any one of claims 1 to 10, characterized in that: include: Injecting transformer oil (201) into the experimental cavity (20); Applying a specified temperature field to the transformer oil (201) through a temperature field loading module (30); Injecting experimental gas into transformer oil (201) through a gas control module (40) to form bubbles of a desired size and quantity; Starting the electric field loading module (50) to apply a high-voltage electric field to the transformer oil (201) to simulate transformer operating conditions; Capturing gas dissolution and diffusion images through an image acquisition module (10); The collected data is analyzed and the solubility and diffusion coefficients of the gas in the transformer oil (201) are calculated.

12. The method for testing the dynamic process of gas in transformer oil according to claim 11, wherein: The method further includes obtaining temperature data of the transformer oil (201) through a temperature sensor (303) and obtaining gas concentration data in the transformer oil (201) through a gas concentration sensor (202); The method of analyzing the collected data and calculating the solubility and diffusion coefficient of the gas in the transformer oil (201) includes analyzing the collected gas solubility and diffusion images, the temperature data of the transformer oil (201), and the gas concentration data, and calculating the solubility and diffusion coefficient of the gas in the transformer oil (201).

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