Device and method for simulating transformer oil gas injection fire disaster under shielding condition of noise reduction device

Abstract

The invention discloses a device and method for simulating a transformer oil gas injection fire disaster under the shielding condition of a noise reduction device. The device comprises an oil drum, a gas cracking device, an oil gas mixing device and an atomization detonation device. Transformer oil in the oil drum and transformer oil cracking gas stored in the cracking gas device are used for being conveyed into the oil-gas mixing device; the oil-gas mixing device is used for simulating oil-gas mixing after actual cracking of transformer oil; the atomization deflagration device is used for atomizing and igniting an oil-gas mixture and simulating the deflagration process of oil-gas mixing after actual transformer oil cracking. The invention further provides a method for calculating the mixing ratio of the transformer oil to the high-temperature cracking gas and the heating oil temperature of the transformer in the deflagration process of the transformer. The device has the advantages that research on the transformer oil injection fire evolution process and the action mechanism of the transformer oil injection fire evolution process and the noise reduction device under the condition of different fault positions and fault forms is achieved, and support is provided for knowing the fire evolution mechanism of the transformer under the condition that the noise reduction device is shielded and researching and developing the noise reduction device capable of falling off.

Description

Technical Field

[0001] The invention relates to the technical field of fire safety of ultra-high voltage transformers, and in particular to a device and method for simulating transformer oil and gas jet fire under the shielding condition of a noise reduction device. Background Art

[0002] Converter stations and substations are important nodes of UHV transmission lines, and UHV transformers are one of the most important equipment in converter stations and substations. However, with the continuous increase in the scale and rapid construction of UHV projects, huge fire risks have arisen. Since 2018, many transformer fire accidents have occurred in UHV converter stations and substations, causing significant economic losses and social impacts. In UHV converter stations and substations, when the transformer oil is in a pressurized leakage state, once it encounters a high-temperature heat source or an open flame, it is very easy to form a jet fire. If it is not suppressed, it will evolve into a multi-directional superimposed three-dimensional fire that spreads horizontally (flowing fire, oil pool fire) and vertically (vertical flowing fire) at the same time. The shielding of the external noise reduction device can easily cause the fire to spread and cause disasters, resulting in serious consequences.

[0003] Typical UHV transformer explosion accidents show that the existing metal BOX-IN noise reduction device cannot automatically fall off in the event of a fire, seriously affecting external firefighting. For example, in 2018, a UHV transformer caught fire. The noise reduction device blocked the fire and affected the firefighting. The fire lasted for more than 20 hours, causing serious equipment damage and economic losses.

[0004] Previous accidents have shown that the development of fires in UHV transformers can be divided into three key stages: First, the transformer oil undergoes rapid cracking under the action of high-energy arcs, etc., increasing the internal pressure; second, the cracked gases H2, C2H2, C2H4, etc., and the transformer oil form a gas-liquid two-phase flow that is ejected from the rupture of the weak part under pressure to form an oil spray. The oil spray has a small particle size in its spray form and is easy to mix with the air. Once it comes into contact with a high-temperature hot surface or an open flame, it is very easy to be ignited, and the flame spreads rapidly to form a jet fire with strong explosiveness and fast spread speed; third, due to the obstruction of the noise reduction device on the top of the transformer, the transformer is enclosed, and the internal temperature rises rapidly, causing the internal fixed fire protection system pipeline to burn. At the same time, due to the obstruction of the noise reduction device, the external fire protection cannot apply the fire extinguishing medium to the fire source, which is easy to cause serious burns. The new detachable noise reduction device has been preliminarily verified to have noise reduction and high-temperature detachment functions, and is expected to be used for noise reduction of UHV converter stations and substation transformers. However, as a new material, there is a lack of a verification test platform to verify the effectiveness of the new detachable noise reduction device and the detachment effect of the transformer under the action of explosive jet flames and the fire evolution process.

[0005] At present, most of the research focuses on the combustion law of transformer oil pool fire and the performance of noise reduction devices under oil pool fire conditions, but there are the following shortcomings:

[0006] First, there is a lack of research on the formation of oil-gas mixed jet fires by transformer oil and its high-temperature pyrolysis gases (H2, C2H2, C2H4, etc.). For example, the invention patent with the publication number CN111693862A discloses a melting plate fusing test platform and test method for a converter transformer. In the article, the action mechanism between it and the noise reduction device is studied using a conventional oil pool fire. Since the temperature rise of the conventional oil pool fire is slow, even though the form of heating the transformer oil is adopted, it still takes 2 - 3 minutes to achieve full combustion (the flame temperature exceeds 1000 °C). In actual transformer deflagration fires, the oil-gas mixed jet fire often rises to above 1000 °C within a few seconds. The action mechanism of this kind of fire with the noise reduction device is significantly different from that of the conventional oil pool fire with the noise reduction device. Therefore, its test platform cannot truly simulate the transformer deflagration fire and the falling-off situation of its noise reduction board under the condition of transformer fire;

[0007] Second, the most typical detonation of the bushing riser on the transformer is closely related to the arc energy. The arc energy mainly rapidly heats the transformer oil inside the riser to high-temperature hot oil and quickly generates a large amount of pyrolysis gases. When it exceeds the critical value that the transformer box can bear, a high-pressure physical explosion occurs at the weak part of the box. After the oil mist is mixed and ejected, under the condition that the ratio of the transformer oil temperature and the pyrolysis gas is appropriate, it encounters high temperature and then causes chemical deflagration, forming a spray fire. Therefore, the transformer oil temperature, the mixing ratio of pyrolysis gases, the flow control ratio, etc. are crucial for simulating the transformer deflagration jet fire. Currently, there is a lack of research on calculation methods such as the mixing ratio of transformer oil and its high-temperature pyrolysis gases, and the heating oil temperature of the transformer oil. Therefore, it is impossible to truly simulate the evolution process of the transformer deflagration fire, nor can it truly simulate the temperature change of the noise reduction board and its hot melting and falling-off situation under the condition of the transformer deflagration fire;

[0008] Third, there are various types of internal arc faults in the transformer. There are scenarios of explosion and deflagration of both high-voltage bushings and low-voltage bushings. The positions and fault energies are different, and the forms of jet fires are various. There are both upward jet fire forms at the top and lateral tearing and oblique jet fires. Moreover, the distance between the noise reduction device and the jet fire source ranges from 0.5 m to 2.0 m. The arc energies and the evolution and disaster-causing forms of jet fires with different fault positions and fault forms are different. Currently, there is a lack of research on the action mechanism between different arc energies, different jet direction fires and the noise reduction device, and it is impossible to truly reflect the evolution state of the transformer jet fire under the shielding condition of the noise reduction device, such as the jet atomization cone angle, the temperature rise change at the top, the cracking and falling-off performance of the noise reduction device, etc.

[0009] In summary, it is urgent to carry out research on the device and method for simulating the oil and gas jet fire of a transformer under the occlusion condition of a noise reduction device, invent a device for simulating the deflagration process of the oil and gas mixture after the actual cracking of transformer oil, propose a calculation method for the mixing ratio of transformer oil and its high-temperature cracking gas and the heating oil temperature of the transformer during the deflagration process of the transformer, and carry out research on the evolution process of the oil and gas jet fire of the transformer at different fault positions and angles and its interaction mechanism with the noise reduction device, so as to provide strong support for understanding the fire evolution mechanism of UHV transformers under the occlusion condition of noise reduction devices and developing detachable noise reduction devices. Summary of the Invention

[0010] The technical problem to be solved by the present invention is to provide a device for simulating the deflagration process of the oil and gas mixture after the cracking of transformer oil, realizing the research on the evolution process of the oil and gas jet fire of the transformer under different fault positions and fault forms and its interaction mechanism with the noise reduction device, and providing strong support for understanding the fire evolution mechanism of the transformer under the occlusion condition of the noise reduction device and developing a detachable noise reduction device.

[0011] To solve the above technical problems, the present invention provides the following technical solutions:

[0012] A device for simulating the oil and gas jet fire of a transformer under the occlusion condition of a noise reduction device includes an oil barrel 11, a cracking gas device 12, an oil and gas mixing device 2, and an atomization and deflagration device 3; the transformer oil in the oil barrel 11 and the transformer oil cracking gas stored in the cracking gas device 12 are used to be transported into the oil and gas mixing device 2; the oil and gas mixing device 2 is used to simulate the actual mixing of the oil and gas after the cracking of transformer oil; the atomization and deflagration device 3 is used to atomize and ignite the oil and gas mixture, simulating the deflagration process of the actual mixing of the oil and gas after the cracking of transformer oil.

[0013] In an embodiment of the present invention, the oil and gas mixing device 2 includes an oil tank 210, a magnetic pump 220, a second temperature sensor T2, a plurality of electric valves, a liquid flowmeter 230, an oil and gas mixer 240, and a plurality of gas flowmeters;

[0014] The magnetic pump 220 is connected to the oil barrel 11, and a manual valve S2 is arranged on the connecting pipeline; the first electric valve MV1 and the second electric valve MV2 are connected to the output of the magnetic pump 220 and divide the pipeline into two paths. One path is an oil injection system composed of the oil barrel 11, the magnetic pump 220, the first electric valve MV1, and the oil tank 210, and the other path is a constant temperature heating system composed of the oil tank 210, the magnetic pump 220, and the second electric valve MV2; among them,

[0015] A first temperature sensor 211 and a heating rod 212 are arranged on the oil tank 210, and a manual valve S1 is arranged on the connecting pipeline between the magnetic pump 220 and the oil tank 210; the second temperature sensor T2 is located on the pipeline connecting the first electric valve MV1 and the oil tank 210;

[0016] The liquid flowmeter 230 is located on the pipeline connecting the oil-gas mixer 240 and the second motorized valve MV2. Multiple gas flowmeters are respectively located on the pipeline connecting the oil-gas mixer 240 and the pyrolysis gas device 12, forming an oil-gas mixing system.

[0017] In an embodiment of the present invention, the oil-gas mixing device 2 includes a first pressure monitoring device 250 and a second pressure monitoring device 260;

[0018] The first pressure monitoring device 250 is located on the output pipeline of the magnetic pump 220 before branching, and the second pressure monitoring device 260 is located on the pipeline between the second motorized valve MV2 and the liquid flowmeter 230;

[0019] The first pressure monitoring device 250 includes a mechanical pressure gauge PG1, a pressure transmitter P1, a filter 251, and a pressure stabilizing tank 252 arranged in sequence along the flow direction of the transformer oil; the second pressure monitoring device 260 includes a mechanical pressure gauge PG2 and a pressure transmitter P2 arranged in sequence.

[0020] In an embodiment of the present invention, the atomization deflagration device 3 includes a trolley 310, a first lead screw slider device 320, and a spray head device 330;

[0021] The first lead screw slider device 320 is fixed on the trolley 310. The first lead screw slider device 320 is connected to the spray head device 330 through an adjustment fixing frame 30 and can drive the spray head device 330 to perform horizontal linear reciprocating motion.

[0022] In an embodiment of the present invention, the spray head device 330 includes a second drive motor 331, a driving wheel 332, a driven wheel 333, a spray head 334, an arc ignition assembly 335, a fire source temperature sensor 336, a third quick joint JK3, and an eleventh quick joint JK11;

[0023] The second drive motor 331 is connected to the driving wheel 332 through a bearing, and the driving wheel 332 meshes with the driven wheel 333;

[0024] The third quick joint JK3 is connected to the oil-gas mixing device 2 by pipe connection, and the third quick joint JK3 is also hermetically connected to the eleventh quick joint JK11 through a pipeline 337; one end of the eleventh quick joint JK11 is connected to the spray head 334, and the other end is connected to the driven wheel 333 through a bearing;

[0025] The arc ignition assembly 335 and the fire source temperature sensor 336 are fixed on the eleventh quick joint JK11; the ignition part of the arc ignition assembly 335 is close to the spray port of the spray head 334, and the fire source temperature sensor 336 monitors the ignition temperature of the arc ignition assembly 335.

[0026] In an embodiment of the present invention, according to the following formula, different fault arc energies to be simulated are determined based on different types and positions of fault arcs (such as arc faults at high-voltage bushings or low-voltage bushings), and the heating temperature of the transformer oil in the oil tank 210 and the flow control ratio of the oil-gas mixture are determined:

[0027] E = E1 + E2;

[0028] E1 = η1E;

[0029] E1 = cM1(T - T0);

[0030] E2 = η2E;

[0031] E2 = E H2 M2 / M H2 +E C2H2 M3 / M C2H2+ E C2H4 M4 / M C2H4 +E3;

[0032] E3 = xE2;

[0033] η 1+ η2 = 1;

[0034] M = M1 + M2 + M3 + M4 + M5;

[0035] M5 = y(M - M1);

[0036] z = M1:M2:M3:M4;

[0037] In the formula, E is the fault arc energy to be simulated, E1 is the energy of the arc used to increase the temperature of the transformer oil, E2 is the energy of the arc used for the cracking of the transformer oil, E3 is the energy consumed by the conversion of the arc energy into other cracking gases except H2, C2H2, and C2H4 gases, η1 is the utilization rate of the arc energy converted into the temperature rise of the transformer oil, η2 is the utilization rate of the arc energy used for the cracking of the transformer oil, c is the specific heat capacity of the transformer oil, M1 is the amount of transformer oil in the oil tank 210, T is the heating temperature of the transformer oil, T0 is the normal operating oil temperature of the transformer oil, x is the energy utilization efficiency of the arc energy causing the cracking of the transformer oil into other cracking gases except H2, C2H2, and C2H4 gases, E H2 、E C2H2 、E C2H4 are the energies required for the arc energy to cause the cracking of the transformer oil to generate H2, C2H2, and C2H4 respectively, M2, M3, and M4 are the masses of the cracking gases H2, C2H2, and C2H4 respectively, M H2、 M C2H2、 M C2H4are the molar masses of H2, C2H2, and C2H4 respectively, M is the amount of transformer oil in the riser at the high-voltage bushing or low-voltage bushing of the arc fault location, M5 is the mass of the transformer oil cracked and converted into other cracked gases except H2, C2H2, and C2H4 gases due to the arc energy, y is the mass utilization efficiency of the transformer oil cracked and converted into other cracked gases except H2, C2H2, and C2H4 gases due to the arc energy, and z is the flow control ratio of the transformer oil, H2, C2H2, and C2H4.

[0038] In an embodiment of the present invention, the device for simulating the occlusion condition of the transformer oil jet fire of the noise reduction device includes a test chamber 4, a smoke exhaust system 5, a sample stage 6, a video data acquisition system 7, an atomization measurement scale 8, and a control system;

[0039] The smoke exhaust system 5 is fixedly located at the top of the test chamber 4. The sample stage 6, the video data acquisition system 7, the atomization measurement scale 8, and the atomization deflagration device 3 are located inside the test chamber 4 and are communicatively connected to the control system.

[0040] In an embodiment of the present invention, the sample stage 6 includes a second lead screw slider device 610, a sample fixing frame 620, a sample temperature acquisition system 630, and a flame temperature acquisition system 640;

[0041] The sample fixing frame 620 is fixedly connected to the second lead screw slider device 610. The second lead screw slider device 610 can adjust the height position of the sample fixing frame 620. The sample fixing frame 620 fixes the edge of the noise reduction sample 00 to be tested, and the middle part of the noise reduction sample 00 to be tested is suspended. During use, the sample temperature acquisition system 630 is closely attached to the upper surface of the noise reduction sample 00 during installation. The flame temperature acquisition system 640 is fixed on the sample fixing frame 620, and the temperature measurement probe faces the suspended position in the middle of the lower surface of the noise reduction sample 00 and maintains a certain distance;

[0042] A height measurement scale 410 is arranged in the test chamber 4. The height measurement scale 410 is located on one side of the sample stage 6.

[0043] In an embodiment of the present invention, the video data acquisition system 7 includes a lifting bracket 710 and a video probe 720. The video probe 720 is connected to the lifting bracket 710. The lifting bracket 710 can adjust the height position of the video probe 720, and the video probe 720 is flush with the spray head 334 of the atomization deflagration device 3 to monitor the spray fire cone angle of the spray head 334, the cracking and falling-off performance of the noise reduction device in real time;

[0044] The atomization measurement scale 8 is located on one side of the atomization deflagration device 3 and is flush with the spray head 334 of the atomization deflagration device 3.

[0045] The present invention also provides a method for using the device for simulating the oil-gas injection fire of a transformer under the shielding condition of the above-mentioned noise reduction device, including: according to the arc energy to be simulated, the oil-gas mixing device 2 heats the transformer oil transported from the oil barrel 11 to the simulated oil temperature, and mixes the oil with the cracking gas in the cracking gas device 12 according to the calculated mixing ratio, and then transports it to the atomization deflagration device 3 for atomizing and igniting the oil-gas mixture to simulate the deflagration process of the oil-gas mixture after the actual cracking of the transformer oil.

[0046] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0047] First, a device for simulating the deflagration process of the oil-gas mixture after the actual cracking of the transformer oil is proposed, and the research on the action mechanism of the oil injection conditions of the transformer at different angles and the noise reduction device is carried out, including the research on the fire evolution process, the injection atomization cone angle, the top temperature rise change, the cracking and shedding performance of the noise reduction device, etc., which provides strong support for understanding the fire evolution mechanism of the UHV transformer with the shielding of the noise reduction device and developing a detachable noise reduction device.

[0048] Second, the present invention proposes a calculation method for the mixing ratio of the transformer oil and its high-temperature cracking gas, the heating oil temperature of the transformer, etc. during the transformer deflagration process, which can calculate and obtain the heating oil temperature of the transformer, the mixing ratio of the transformer oil and its high-temperature cracking gas, and the mass flow rate according to the different arc energies at different fault positions, determine the mixing ratio and mass flow rate control of the simulated transformer oil temperature and cracking gas, realize the real simulation of the transformer deflagration fire evolution process, and at the same time realize the research on the temperature change and the heat melting and shedding conditions of the noise reduction board under the transformer deflagration fire conditions.

[0049] The noise reduction sample to be tested is set on the liftable second screw slider device, and a sample temperature acquisition system is set thereon. The nozzle device is set on the trolley. First, the initial position of the nozzle device and the noise reduction sample to be tested is adjusted, and then further position adjustment is carried out through the first screw slider device. Finally, the gear can be driven to realize the angle adjustment of the spray head, and various forms of the transformer injection fire can be adjusted. The height of the noise reduction sample can also be adjusted through the second screw slider device to realize the research on the action mechanism of the fire under different distances between the nozzle device and the noise reduction sample. Description of the Drawings

[0050] Figure 1 It is a schematic diagram of a device for simulating the oil-gas injection fire of a transformer under the shielding condition of a noise reduction device according to an embodiment of the present invention.

[0051] Figure 2 It is a side view of the test platform for the fusing performance of the noise reduction device according to an embodiment of the present invention.

[0052] Figure 3 It is a top view of the nozzle device according to an embodiment of the present invention.

[0053] Figure 4 Schematic diagram of the positions of the sample to be noise-reduced, the sample temperature acquisition system, and the flame temperature acquisition system according to an embodiment of the present invention.

[0054] Figure 5 Schematic diagram of the video data acquisition system according to an embodiment of the present invention.

[0055] Figure 6 Schematic diagram of the temperature change process collected by the flame temperature acquisition system after ignition in an embodiment of the present invention. Detailed implementation manners

[0056] To facilitate those skilled in the art to understand the technical solution of the present invention, the technical solution of the present invention will be further described below with reference to the accompanying drawings of the specification.

[0057] The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0058] Please refer to Figure 1 As shown, the present invention provides a device for simulating an oil-gas injection fire of a transformer under the occlusion condition of a noise reduction device, which includes an oil barrel 11, a cracking gas device 12, an oil-gas mixing device 2, and an atomizing deflagration device 3. The transformer oil in the oil barrel 11 and the transformer oil cracking gas stored in the cracking gas device 12 are used to be transported into the oil-gas mixing device 2. The oil-gas mixing device 2 is used to simulate the actual oil-gas mixing after the cracking of transformer oil, and the atomizing deflagration device 3 is used to atomize and ignite the oil-gas mixture to simulate the deflagration process of the actual oil-gas mixing after the cracking of transformer oil.

[0059] In an embodiment of the present invention, the oil barrel 11 is connected to the oil-gas mixing device 2 through a quick connector one JK1 and a quick connector two JK2.

[0060] In an embodiment of the present invention, the oil-gas mixing device 2 includes an oil tank 210, a magnetic pump 220, a temperature sensor two T2, a plurality of electric valves, a liquid flowmeter 230, an oil-gas mixer 240, and a plurality of gas flowmeters.

[0061] In this embodiment, the magnetic pump 220 is connected to the oil barrel 11, and a manual valve two S2 is arranged on the connecting pipeline; the electric valve one MV1 and the electric valve two MV2 are connected to the output of the magnetic pump 220, and the pipeline is divided into two paths. One path is an oil injection system composed of the oil barrel 11, the magnetic pump 220, the electric valve one MV1, and the oil tank 210, and the other path is a constant temperature heating system composed of the oil tank 210, the magnetic pump 220, and the electric valve two MV2.

[0062] In this embodiment, a first temperature sensor 211 and a heating rod 212 are provided on the fuel tank 210, which are respectively used for collecting the temperature of the transformer oil in the fuel tank 210 and heating the transformer oil. A manual valve S1 is provided on the pipeline connecting the magnetic pump 220 and the fuel tank 210. The second temperature sensor T2 is located on the pipeline connecting the first electric valve MV1 and the fuel tank 210.

[0063] In this embodiment, a liquid level transmitter 213 with scale display is further provided on the fuel tank 210 to visually observe the position of the oil level in the fuel tank 210 at the experimental site, and it can be connected to the control system for real-time monitoring of the liquid level information. In addition, a fuel tank cover plate 214 is provided on the top of the fuel tank 210 for experimental personnel to observe the state of the transformer oil, and at the same time to prevent a large amount of dangerous gases from being generated due to misoperation during the heating process, ensuring the safe progress of the experiment. In addition, the magnetic pump 220, the second temperature sensor T2, multiple electric valves, the liquid flowmeter 230 and multiple gas flowmeters are all communicatively connected to the control system.

[0064] In an embodiment of the present invention, the liquid flowmeter 230 is located on the pipeline connecting the oil-gas mixer 240 and the second electric valve MV2, and multiple gas flowmeters are respectively located on the pipelines connecting the oil-gas mixer 240 and the cracking gas device 12, forming an oil-gas mixing system.

[0065] In an embodiment of the present invention, the oil-gas mixing device 2 includes a first pressure monitoring device 250 and a second pressure monitoring device 260. The first pressure monitoring device 250 is located on the output pipeline before the magnetic pump 220 is branched, and the second pressure monitoring device 260 is located on the pipeline between the second electric valve MV2 and the liquid flowmeter 230;

[0066] The first pressure monitoring device 250 includes a mechanical pressure gauge PG1, a pressure transmitter P1, a filter 251, and a pressure stabilizing tank 252 arranged in sequence along the flow direction of the transformer oil. The second pressure monitoring device 260 includes a mechanical pressure gauge PG2 and a pressure transmitter P2 arranged in sequence. The oil-gas mixing device 2 further includes a safety valve SV1, which communicates the oil injection system and the constant temperature heating system.

[0067] In this embodiment, the cracking gas device 12 includes an H2 gas storage device, a C2H2 gas storage device, and a C2H4 gas storage device. The C2H4 gas storage device is connected to the oil-gas mixer 240 through the quick connector five JK5 and the quick connector six JK6, and an electric valve three MV3 and a gas flowmeter one 271 are arranged on the connecting pipeline. The C2H2 gas storage device is connected to the oil-gas mixer 240 through the quick connector seven JK7 and the quick connector eight JK8, and an electric valve four MV4 and a gas flowmeter two 272 are arranged on the connecting pipeline. The H2 gas storage device is connected to the oil-gas mixer 240 through the quick connector nine JK9 and the quick connector ten JK10, and an electric valve five MV5 and a gas flowmeter three 273 are arranged on the connecting pipeline.

[0068] In this embodiment, the oil-gas mixer 240 is connected to the atomization deflagration device 3 through the quick connector three JK3 and the quick connector four JK4, and an electric valve six MV6 is arranged on the connecting pipeline.

[0069] In an embodiment of the present invention, according to different types of arc faults, different fault arc energies to be simulated, the heating temperature of the transformer oil in the fuel tank 210, and the flow control ratio of oil-gas mixing are obtained through the following methods:

[0070] E = E1 + E2;

[0071] E1 = η1E;

[0072] E1 = cM1(T - T0);

[0073] E2 = η2E;

[0074] E2 = E H2 M2 / M H2 +E C2H2 M3 / M C2H2+ E C2H4 M4 / M C2H4 +E3;

[0075] E3 = xE2;

[0076] η 1+ η2 = 1;

[0077] M = M1 + M2 + M3 + M4 + M5;

[0078] M5 = y(M - M1);

[0079] z = M1:M2:M3:M4;

[0080] Wherein, E is the energy of the fault arc to be simulated, E1 is the energy used for the temperature rise of the transformer oil in the arc energy, E2 is the energy used for the cracking of the transformer oil in the arc energy, E3 is the energy consumed by the conversion of the arc energy into other cracking gases except H2, C2H2, and C2H4 gases, η1 is the utilization rate of the arc energy converted into the temperature rise of the transformer oil, generally 60%-80%, η2 is the utilization rate of the arc energy for the cracking of the transformer oil, c is the specific heat capacity of the transformer oil, M1 is the amount of transformer oil in the fuel tank 210, T is the heating temperature of the transformer oil, T0 is the normal operating oil temperature of the transformer oil, generally 50-95°C, x is the energy utilization efficiency of the arc energy causing the cracking of the transformer oil into other cracking gases except H2, C2H2, and C2H4 gases, generally 1%-2%, E H2 、E C2H2 、E C2H4 are the energies required for the cracking of the transformer oil by the arc energy to generate H2, C2H2, and C2H4 respectively. Specifically, E H2 is about 20-30 kJ / mol, E C2H2 is about 100-200 kJ / mol, E C2H4 is about 80-100 kJ / mol. M2, M3, and M4 are the masses of the cracking gases H2, C2H2, and C2H4 respectively, M H2、 M C2H2、 M C2H4 are the molar masses of H2, C2H2, and C2H4 respectively, which are 0.002 kg / mol, 0.0025 kg / mol, and 0.0032 kg / mol respectively. M is the amount of transformer oil in the riser at the high-voltage bushing or low-voltage bushing at the arc fault location, M5 is the mass of the transformer oil cracked by the arc energy into other cracking gases except H2, C2H2, and C2H4 gases, y is the mass utilization efficiency of the arc energy causing the cracking of the transformer oil into other cracking gases except H2, C2H2, and C2H4 gases, generally 5%-10%, and z is the flow control ratio of the transformer oil, H2, C2H2, and C2H4.

[0081] The most typical deflagration of the bushing riser of a transformer is closely related to the arc energy. The arc energy mainly heats the transformer oil inside the bushing riser to quickly rise to high-temperature hot oil and rapidly generate a large amount of cracked gas, resulting in a high-pressure physical explosion, which in turn triggers a chemical deflagration and forms a spray fire. Therefore, the transformer oil temperature, the mixing ratio of cracked gas, the flow control ratio, etc. are crucial for simulating the deflagration jet fire of the transformer. In this embodiment, the oil tank 210 is used to simulate the temperature rise generated by the action of the transformer oil volume inside the bushing riser of the transformer, and the cracked gas device 12 is used to simulate and provide the cracked gas generated by the transformer oil under the action of high-energy arcs, etc. Therefore, when simulating the deflagration of the oil-gas mixture after the cracking of the transformer oil, through the above formula, the arc energy to be simulated is given, the heating temperature of the transformer oil in the oil tank 210 is obtained, and the flow control ratios of the cracked gases H2, C2H2, and C2H4 are obtained. After obtaining these parameters, the oil tank 210 is heated to a constant temperature according to the obtained temperature, and the mixing ratio, flow control ratio, etc. required for the cracked gas are controlled.

[0082] Please refer to Figures 1 to 5 As shown, in an embodiment of the present invention, the atomization deflagration device 3 includes a trolley 310, a first lead screw slider device 320, and a nozzle device 330.

[0083] In this embodiment, the bottom of the trolley 310 uses universal wheels 311, which are convenient for the test personnel to manually position to a suitable position, and is provided with a handle 312 for convenient operation by personnel.

[0084] In this embodiment, the first lead screw slider device 320 is fixedly located on the trolley 310. The first lead screw slider device 320 includes a lead screw assembly 321, a driving motor 322, and a sliding plate 323. The driving motor 322 and the lead screw assembly 321 drive the sliding plate 323 to move repeatedly along the lead screw assembly 321.

[0085] In this embodiment, the nozzle device 330 is connected to the first lead screw slider device 320 through an adjustment fixing frame 30. The stability during the injection process when reverse stress is generated is improved by combining with the universal wheels 311 with brakes. At the same time, the driving motor 322 and the lead screw assembly 321 drive the sliding plate 323 to move, and remote adjustment is performed during the experiment to achieve dual adjustment of manual and remote to ensure the safety of the experiment and the authenticity and reliability of the data.

[0086] In an embodiment of the present invention, the nozzle device 330 includes a driving motor 331, a driving wheel 332, a driven wheel 333, a spray head 334, an arc ignition assembly 335, a fire source temperature sensor 336, a quick joint three JK3, and a quick joint eleven JK11.

[0087] In this embodiment, the quick connector three JK3 is hermetically connected to the quick connector four JK4 that connects the oil-gas mixer 240 through a high-temperature and high-pressure corrugated hose. The quick connector three JK3 is hermetically connected to the quick connector eleven JK11 through a pipeline 337, and the quick connector eleven JK11 is hermetically connected to the spray head 334. The spray head 334 has various specifications and models and is selected for use according to the test requirements.

[0088] In this embodiment, the drive motor two 331 is connected to the driving wheel 332 through a bearing. The driving wheel 332 meshes with the driven wheel 333, and the driven wheel 333 is connected to the quick connector eleven JK11 through a bearing. The drive motor two 331 drives the driving wheel 332 to perform a circular motion, and the driving wheel 332 drives the driven wheel 333 to perform a circular motion, realizing the angle adjustment of the quick connector eleven JK11, and further realizing the angle adjustment of the spray head 334 in the longitudinal direction. The arc ignition assembly 335 and the fire source temperature sensor 336 are fixed on the quick connector eleven JK11. The ignition part of the arc ignition assembly 335 is close to the jet orifice of the spray head 334, and the fire source temperature sensor 336 monitors the ignition temperature of the arc ignition assembly 335.

[0089] In this embodiment, undoubtedly, the drive motor one 322, the drive motor two 331, the arc ignition assembly 335, and the fire source temperature sensor 336 are communicatively connected to the control system to realize remote control for adjusting the nozzle angle, automatic ignition, and collecting the fire source temperature, ensuring the safety of experimental personnel.

[0090] In an embodiment of the present invention, the device for simulating the occlusion condition of a transformer oil-gas jet fire by a noise reduction device further includes a test chamber 4, a smoke exhaust system 5, a sample table 6, a video data acquisition system 7, an atomization measurement scale 8, and a control system. The smoke exhaust system 5 is fixedly located at the top of the test chamber 4. The sample table 6, the video data acquisition system 7, the atomization measurement scale 8, and the atomization deflagration device 3 are located inside the test chamber 4 and are communicatively connected to the control system.

[0091] In this embodiment, a height measurement scale 410 is arranged inside the test chamber 4. The height measurement scale 410 is located on one side of the sample table 6, facilitating experimental personnel to measure the distance between the jet fire and the noise reduction sample and ensuring the reliability of test data.

[0092] In this embodiment, the smoke exhaust system 5 includes a fan 510 and an air duct 520. The top of the test chamber 4 is connected to the smoke exhaust system 5 through a pipeline. When the smoke exhaust system 5 operates, the fan 510 extracts the smoke in the test chamber 4 and discharges it through the air duct 520, timely discharging the experimental smoke and avoiding excessive smoke from affecting the experimental measurement effect and experimental safety.

[0093] In an embodiment of the present invention, the sample stage 6 includes a second lead screw slider device 610, a sample fixing frame 620, a sample temperature acquisition system 630, and a flame temperature acquisition system 640. The sample fixing frame 620 is fixedly connected to the second lead screw slider device 610, and the second lead screw slider device 610 can adjust the height position of the sample fixing frame 620. The sample fixing frame 620 fixes the edge of the noise reduction sample 00 to be measured, and the middle part of the noise reduction sample 00 to be measured is suspended. During use, the sample temperature acquisition system 630 is closely attached to the upper surface of the noise reduction sample 00 when it is installed. The flame temperature acquisition system 640 is fixed on the sample fixing frame 620, and the temperature measurement probe faces the suspended position in the middle of the lower surface of the noise reduction sample 00 to be measured and maintains a certain distance. Among them, the sample temperature acquisition system 630 and the flame temperature acquisition system 640 are communicatively connected to the control system. The sample temperature acquisition system 630 is used to collect the temperature change of the noise reduction sample 00 to be measured in real time, and the flame temperature acquisition system 640 is used to collect the temperature of the sprayed flame in real time. Specifically, both the sample temperature acquisition system 630 and the flame temperature acquisition system 640 mainly use multiple thermocouples for temperature measurement. The thermocouples are arranged on the upper surface and the lower surface of the noise reduction sample 00 to be measured, and the temperature measurement range of the thermocouples is 0 to 1300 °C. And, the flame temperature acquisition system 640 is 0.5 cm to 5 cm away from the suspended position in the middle of the lower surface of the noise reduction sample 00 to be measured.

[0094] In this embodiment, the second lead screw slider device 610 includes a driving motor three 611, a lead screw assembly two 612, and a sliding plate two 613. The driving motor three 611, the lead screw assembly two 612, and the sliding plate two 613 form an up-and-down movement mechanism. The sample fixing frame 620 is connected to the sliding plate two 613, and the driving motor three 611 drives the sliding plate two 613 to perform synchronous up-and-down movement. And, the driving motor three 611 is communicatively connected to the control system to realize remote control of the distance between the sample and the sprayed fire as needed.

[0095] Please refer to Figure 5 As shown, in an embodiment of the present invention, the video data acquisition system 7 includes a lifting bracket 710 and a video probe 720. The video probe 720 is connected to the lifting bracket 710. The lifting bracket 710 can adjust the height position of the video probe 720, and the video probe 720 is flush with the spray head 334 of the atomization deflagration device 3 to monitor the spray fire cone angle, the cracking and falling-off performance of the noise reduction device of the spray head 334 in real time.

[0096] In this embodiment, the lifting bracket 710 includes a fourth driving motor 711, a third lead screw assembly 712, a third sliding plate 713, and a video fixing bracket 714. The video fixing bracket 714 is fixedly connected to the third sliding plate 713, and the video probe 720 is fixedly connected to the video fixing bracket 714. Moreover, the fourth driving motor 711 is communicatively connected to the control system. The fourth driving motor 711 and the third lead screw assembly 712 drive the third sliding plate 713 to move up and down, synchronously driving the video probe 720 to move.

[0097] In this embodiment, the atomization measurement scale 8 is located on one side of the atomization deflagration device 3 and is flush with the spray head 334 of the atomization deflagration device 3, and is used to observe and measure parameters such as the injection fire cone angle. Further, the video probe 720 can be remotely controlled and adjusted to a position flush with the spray head 334 and the atomization measurement scale 8 to realize real-time monitoring of parameters such as the injection fire cone angle, the cracking and shedding performance of the noise reduction device.

[0098] In an embodiment of the present invention, according to the statistics of typical high-riser faults of large transformers, the fault arc energy E is taken as 40 MJ, and the mass M of the transformer oil in the high-riser at the high-voltage bushing where the arc fault occurs is 100 kg. η1 is the utilization rate of the arc energy converted into the temperature rise of the transformer oil, taken as 60%, η2 is the utilization rate of the arc energy for the cracking of the transformer oil, c is the specific heat capacity of the transformer oil, with a value of 2 kJ / kg·°C. The mass of the transformer oil cracked by 1 MJ of arc energy is generally about 25 g, and the mass of the transformer oil cracked by 40 MJ of arc energy is about 1 kg. Therefore, the mass of the transformer oil in the high-riser is 100 kg minus the cracked transformer oil of 1 kg, which is 99 kg, that is, the mass M1 of the transformer oil in the fuel tank 210. T0 is the normal operating oil temperature of the transformer oil, with a value of 60 °C, x is the energy utilization efficiency of the arc energy causing the cracking of the transformer oil into other cracked gases except H2, C2H2, and C2H4 gases, with a value of 2%, E H2 、E C2H2 、E C2H4 are the energies required for the arc energy to cause the cracking of the transformer oil to generate H2, C2H2, and C2H4 respectively. Specifically, E H2 takes a value of 20 kJ / mol, E C2H2 is about 100 kJ / mol, E C2H4 is about 80 kJ / mol. y is the mass utilization efficiency of the arc energy causing the cracking of the transformer oil into other cracked gases except H2, C2H2, and C2H4 gases, with a value of 10%, M H2、 M C2H2、 M C2H4 are 0.002 kg / mol, 0.0025 kg / mol, and 0.0032 kg / mol respectively. Taking the data obtained under this working condition as an example for theoretical calculation:

[0099] E1 = η1E = 60%×40 = 24 MJ = 24000 kJ;

[0100] From E1 = cM1(T - T0), we can obtain T = E1 / (cM1)+T0 = 24000 / (2×99)+60 = 181.21 °C ≈ 181 °C;

[0101] E2 = η2E = (1 - η1)E = (1 - 60%)×40 = 16 MJ = 16000 kJ;

[0102] E3 = xE2 = 2%×16000 = 320 kJ;

[0103] M5 = y(M - M1) = 10%×(100 - 99) = 0.1 kg;

[0104] From M = M1 + M2 + M3 + M4 + M5, we can get M2 + M3 + M4 = M - M1 - M5 = 100 - 99 - 0.1 = 0.9 kg;

[0105] From E2 = E H2 M2 / M H2 +E C2H2 M3 / M C2H2+ E C2H4 M4 / M C2H4 +E3, we can obtain:

[0106] E H2 M2 / M H2 +E C2H2 M3 / M C2H2+ E C2H4 M4 / M C2H4 = E2 - E3 = 16000 - 320 = 15680 kJ;

[0107] Substituting the data for calculation, we get 20×M2 / 0.002 + 100×M3 / 0.0025 + 80×M4 / 0.0032 = 15680;

[0108] That is, 10M2 + 40M3 + 25M4 = 15.68;

[0109] M2 + M3 + M4 = M - M1 - M5 = 100 - 99 - 0.1 = 0.9;

[0110] Calculating, we get M3 = M2 - 0.45;

[0111] M4 = 1.35 - 2M2;

[0112] z = M1:M2:M3:M4 = M1:M2:(M2 - 0.45):(1.35 - 2M2); When M2 is taken as 0.6 and substituted, we get z = M1:M2:M3:M4 = M1:M2:(M2 - 0.45):(1.35 - 2M2) = 99:0.6:0.15:0.15.

[0113] It should be noted that M1:M2:M3:M4 are all mass flow ratios. For the cracked gas, it needs to be converted to gas volume flow. The storage pressure of the cracked gas is taken as 1.5 Mpa. According to the ideal gas equation, at normal temperature of 25°C and a pressure of 1.5 Mpa, the volumes of storing 1 kg of H2, C2H2, and C2H4 are approximately 826 L, 64 L, and 59 L respectively. Then:

[0114] z = M1:M2:M3:M4 = (99÷60) kg / min:(0.6×826÷60) L / min:(0.15×64÷60) L / min:(0.15×59÷60) L / min = 1.65 kg / min:8.26 L / min:0.16 L / min:0.15 L / min. Start the experiment according to this flow control ratio of transformer oil, H2, C2H2, and C2H4. The flame temperature acquisition system 640 includes a first flame temperature measurement thermocouple 641, a second flame temperature measurement thermocouple 642, a third flame temperature measurement thermocouple 643, and a fourth flame temperature measurement thermocouple 644. After ignition, under typical working conditions, the change process of the flame temperature collected by the four flame temperature measurement thermocouples is as Figure 6 shown. Starting to ignite at 0 s and closing the fire source at 85 s, it can be seen that the temperature exceeds 1000°C around 8 s and reaches 1182°C, indicating that this device can rapidly increase the temperature to above 1000°C within a few seconds, which is very consistent with the temperature change of the UHV transformer deflagration spray fire.

[0115] Please refer to Figures 1 to 5 shown. The present invention also provides a method for using a device that simulates the oil - gas injection fire of a transformer under the occlusion condition of a noise reduction device, including: According to the arc energy to be simulated, the oil - gas mixing device 2 heats the transformer oil transported from the oil barrel 11 to simulate the oil temperature, mixes it with the cracked gas in the cracked gas device 12, and then transports it to the atomization deflagration device 3 for atomizing and igniting the oil - gas mixture to simulate the actual deflagration process of the oil - gas mixture after the cracking of the transformer oil, specifically as follows:

[0116] In an embodiment of the present invention, the present invention can simulate the following situations:

[0117] First, the original states of the manual valves S1, S2, and the electric valves MV1 - 6 are all in the closed state.

[0118] 1. Transformer oil temperature simulation;

[0119] 1.1 Transformer oil filling;

[0120] Seal and connect quick connector one JK1 and quick connector two JK2 through a hose. Insert the hose into the bottom of oil barrel 11. Open manual valve two S2. The operator clicks the function selection "oil filling" function button on the control system interface. After starting, open electric valve one MV1 and magnetic pump 220. At this time, inject the transformer oil in oil barrel 11 into oil tank 210. During the process, compare the liquid level value of oil tank 210 collected by the system with the parameter set value. After the oil tank liquid level value = parameter value, the system closes magnetic pump 220 and electric valve one MV1 in sequence, and prompts the operator to close manual valve two S2. The oil filling ends and enters the heating function.

[0121] 1.2 Transformer oil heating;

[0122] Open manual valve one S1. The operator clicks the function selection "heating" function button on the control system interface. After starting, open electric valve one MV1, magnetic pump 220, and heating rod 212. At this time, circulate and disturb the transformer oil in oil tank 210 to uniformly raise the temperature. During the process, collect the temperatures measured by temperature sensor one 211 and temperature sensor two T2 by the system, take the average temperature as the PID control target value to control the heating rod to raise the temperature in real time, and compare it with the parameter set value. After the average temperature = parameter value, the system closes magnetic pump 220, electric valve one MV1, and heating rod 212 in sequence, and prompts the operator to close manual valve one S1. The transformer oil heating ends.

[0123] 2. Performance test of the fuse and detachment of the noise reduction device under the action of transformer jet fire;

[0124] Preparation: Connect quick connectors JK3 - 4, JK5 - 6, JK7 - 8, and JK9 - 10 respectively through high-temperature and high-pressure corrugated hoses. Connect the spray head 334 to quick connector eleven JK11. Place the noise reduction sample to be tested 00 on the sample fixing rack 620. Adjust the lifting bracket 710 to make the video probe 720 level with the spray head 334 and the atomization measurement scale 8.

[0125] 2.1 Experimental atomizing nozzle test: Open manual valve S1. The operator clicks the "Heating" function button in the control system interface. After startup, open electric valve MV1, magnetic pump 220, and heating rod 212. At this time, the transformer oil in oil tank 210 is circulated and disturbed to evenly increase the temperature. During the process, the system collects the temperatures measured by temperature sensor 211 and temperature sensor T2, and takes the average temperature as the PID control target value to control the heating of the heating rod in real time. Compare it with the parameter setting value (different transformer oil heating temperature setting values are calculated and set according to different simulated arc energies). After the average temperature = parameter value, close electric valve MV1. Open electric valve MV6 and electric valve MV2 for constant temperature and constant pressure spraying and atomization. The operator monitors and analyzes parameters such as the atomization cone angle in real time through video probe 720 and atomization measurement scale 8. After confirmation, close heating rod 212, magnetic pump 220, electric valve MV6, and electric valve MV2 in sequence.

[0126] 2.2 Parameter setting: The operator clicks the "Parameter Setting" function button in the control system interface, and sets parameters for the transformer oil temperature, pressure, flow rate, and the mixing ratio of cracking gases (H2, C2H2, C2H4, etc.) and transformer oil according to different simulated arc energies. After the parameter setting is completed, enter the test of the shedding performance of the noise reduction device. The specific parameters are determined according to different arc energies to be simulated.

[0127] 2.3 Noise reduction device fusing and falling-off performance test: Open manual valve S1. The operator adjusts the sample fixing bracket 620 and the nozzle device 330 according to the experimental conditions and working conditions to make the spraying fire spraying angle, the noise reduction sample 00 to be measured and the height of the spraying fire reach the required spatial positions in the experiment. Click the function selection "falling-off performance test" function button on the control system interface. After starting, turn on the smoke exhaust system 5, electric valve MV1, magnetic pump 220, and heating rod 212. At this time, circulate and agitate the transformer oil in the fuel tank 210 to uniformly increase the temperature. During the process, the system collects the temperatures measured by temperature sensor 211 and temperature sensor T2, and takes the average temperature as the PID control target value to control the heating of heating rod 212 in real time. Compare it with the parameter setting value. When the average temperature = the parameter value, close electric valve MV1. The system collects the pressure value measured by pressure transmitter P1 and compares it with the parameter setting value. When the pressure value ≥ the parameter value (during this process, the system collects the pressure value measured by pressure transmitter P2 and compares it with the parameter setting value. When the pressure value measured by pressure transmitter P2 ≥ the parameter value or exceeds the protection value of safety valve SV1, open safety valve SV1 to relieve pressure to ensure the safety of the experiment), open electric valve MV6 and electric valve MV2 for constant temperature, constant pressure and constant flow spraying and atomization. After 2 s, open electric valve MV3, electric valve MV4, and electric valve MV5 to spray the cracking gas and transformer oil in the required mixing ratio. After 3 s, the system automatically turns on the arc ignition component 335 for ignition, and at the same time turns on the fire source temperature sensor 336, (turn off the arc ignition component 335 after ignition or when the fire source temperature sensor 336 exceeds the set value). The system records parameters such as the start time, ignition time, ignition time, and end time of the test, and tests the falling-off performance of the noise reduction sample 00 to be measured under the action of the spraying fire. After the noise reduction sample 00 to be measured falls off, the test ends. Sequentially turn off the magnetic pump 220, heating rod 212, and electric valves MV2-6. When there is no flue gas in the test chamber 4, turn off the smoke exhaust system 5. Circulate the above operations for different experimental conditions such as temperature, pressure, flow rate, atomization angle, and height.

[0128] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0129] The above-described embodiments merely represent the implementation manners of the invention. The protection scope of the present invention is not limited to the above embodiments only. For those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all fall within the protection scope of the present invention.

Claims

1. A device for simulating a noise reduction device to block the oil and gas injection fire of a transformer under occlusion conditions, characterized in that It includes an oil barrel (11), a cracking gas device (12), an oil-gas mixing device (2) and an atomization deflagration device (3); the transformer oil in the oil barrel (11) and the transformer oil cracking gas stored in the cracking gas device (12) are used to be transported into the oil-gas mixing device (2); the oil-gas mixing device (2) is used to simulate the oil-gas mixing after actual transformer oil cracking; The atomization deflagration device (3) is used to atomize and ignite the oil-gas mixture to simulate the deflagration process of the oil-gas mixture after actual transformer oil cracking.

2. The device for shielding the oil-gas injection fire of the condition transformer in the analog noise reduction device according to claim 1, characterized in that, The oil-gas mixing device (2) includes an oil tank (210), a magnetic pump (220), a second temperature sensor (T2), multiple electric valves, a liquid flowmeter (230), an oil-gas mixer (240) and multiple gas flowmeters; The magnetic pump (220) is connected to the oil barrel (11), and a second manual valve (S2) is arranged on the connecting pipeline; the first electric valve (MV1) and the second electric valve (MV2) are connected to the output of the magnetic pump (220) and divide the pipeline into two paths. One path is an oil injection system composed of the oil barrel (11), the magnetic pump (220), the first electric valve (MV1) and the oil tank (210), and the other path is a constant temperature heating system composed of the oil tank (210), the magnetic pump (220) and the second electric valve (MV2); among them, A first temperature sensor (211) and a heating rod (212) are arranged on the oil tank (210), and a first manual valve (S1) is arranged on the connecting pipeline between the magnetic pump (220) and the oil tank (210); the second temperature sensor (T2) is located on the pipeline connecting the first electric valve (MV1) and the oil tank (210); The liquid flowmeter (230) is located on the pipeline connecting the oil-gas mixer (240) and the second electric valve (MV2), and multiple gas flowmeters are respectively located on the pipelines connecting the oil-gas mixer (240) and the cracking gas device (12), forming an oil-gas mixing system.

3. The device for shielding the oil-gas injection fire of the transformer under the occlusion condition of the analog noise reduction device according to claim 2, wherein, The oil-gas mixing device (2) includes a first pressure monitoring device (250) and a second pressure monitoring device (260); The first pressure monitoring device (250) is located on the output pipeline before the magnetic pump (220) is branched, and the second pressure monitoring device (260) is located on the pipeline between the second electric valve (MV2) and the liquid flowmeter (230); The first pressure monitoring device (250) includes a first mechanical pressure gauge (PG1), a first pressure transmitter (P1), a filter (251), and a pressure stabilizing tank (252) arranged in sequence according to the flow direction of the transformer oil; the second pressure monitoring device (260) includes a second mechanical pressure gauge (PG2) and a second pressure transmitter (P2) arranged in sequence.

4. The device for shielding the oil-gas injection fire of a condition transformer in the analog noise reduction device according to claim 1, characterized in that, The atomization deflagration device (3) includes a trolley (310), a first lead screw slider device (320) and a nozzle device (330); The first lead screw slider device (320) is fixed on the trolley (310), and the first lead screw slider device (320) is connected to the nozzle device (330) through an adjustment fixing frame (30), and can drive the nozzle device (330) to perform horizontal linear reciprocating motion.

5. The device for shielding the oil-gas injection fire of a condition transformer in the analog noise reduction device according to claim 4, characterized in that The nozzle device (330) includes a second drive motor (331), a driving wheel (332), a driven wheel (333), a spray head (334), an arc ignition assembly (335), a fire source temperature sensor (336), a third quick connector (JK3), and an eleventh quick connector (JK11); The second drive motor (331) is connected to the driving wheel (332) through a bearing, and the driving wheel (332) meshes with the driven wheel (333); The third quick connector (JK3) is pipe-connected to the oil-gas mixing device (2), and the third quick connector (JK3) is also hermetically connected to the eleventh quick connector (JK11) through a pipeline (337); one end of the eleventh quick connector (JK11) is connected to the spray head (334), and the other end is connected to the driven wheel (333) through a bearing; The arc ignition assembly (335) and the fire source temperature sensor (336) are fixed on the eleventh quick connector (JK11); the ignition part of the arc ignition assembly (335) is close to the injection port of the spray head (334), and the fire source temperature sensor (336) monitors the ignition temperature of the arc ignition assembly (335).

6. The device for shielding the oil-gas injection fire of a condition transformer in the analog noise reduction device according to claim 2, characterized in that, According to the following formula, different fault arc energies to be simulated according to different types of arc faults are used to determine the heating temperature of the transformer oil in the fuel tank (210) and the flow control ratio of oil-gas mixing: E = E1 + E2; E1 = η1E; E1 = cM1(T - T0); E2 = η2E; E2 = E H2 M2 / M H2 +E C2H2 M3 / M C2H2+ E C2H4 M4 / M C2H4 +E3; E3 = xE2; η 1+ η2 = 1; M = M1 + M2 + M3 + M4 + M5; M5 = y(M - M1); z = M1:M2:M3:M4; Wherein, E is the faulty arc energy to be simulated, E1 is the energy in the arc energy used for the temperature rise of the transformer oil, E2 is the energy in the arc energy used for the cracking of the transformer oil, E3 is the energy consumed by the conversion of the arc energy into other cracking gases except H2, C2H2, and C2H4 gases, η1 is the utilization rate of the arc energy converted into the temperature rise of the transformer oil, η2 is the utilization rate of the arc energy for the cracking of the transformer oil, c is the specific heat capacity of the transformer oil, M1 is the amount of transformer oil in the fuel tank 210, T is the heating temperature of the transformer oil, T0 is the normal operating oil temperature of the transformer oil, x is the energy utilization efficiency of the arc energy causing the transformer oil to crack and convert into other cracking gases except H2, C2H2, and C2H4 gases, E H2 、E C2H2 、E C2H4 are respectively the energies required for the transformer oil to crack and generate H2, C2H2, and C2H4 by the arc energy, M2, M3, and M4 are respectively the masses of the cracking gases H2, C2H2, and C2H4, M H2、 M C2H2、 M C2H4 are respectively the molar masses of H2, C2H2, and C2H4, M is the amount of transformer oil in the riser at the high-voltage bushing or low-voltage bushing at the arc fault location, M5 is the mass of the transformer oil cracked and converted into other cracking gases except H2, C2H2, and C2H4 gases by the arc energy, y is the mass utilization efficiency of the arc energy causing the transformer oil to crack and convert into other cracking gases except H2, C2H2, and C2H4 gases, and z is the flow control ratio of the transformer oil, H2, C2H2, and C2H4.

7. The device for shielding the oil-gas injection fire of a condition transformer in the analog noise reduction device according to claim 1, characterized in that, The device for simulating the occlusion condition of the transformer oil-gas injection fire by the noise reduction device includes a test chamber (4), a smoke exhaust system (5), a sample table (6), a video data acquisition system (7), an atomization measurement scale (8), and a control system; The smoke exhaust system (5) is fixed at the top of the test chamber (4), and the sample table (6), the video data acquisition system (7), the atomization measurement scale (8), and the atomization deflagration device (3) are located inside the test chamber (4) and are communicatively connected to the control system.

8. The device for shielding the oil-gas injection fire of a condition transformer in the analog noise reduction device according to claim 7, characterized in that, The sample table (6) includes a second lead screw slider device (610), a sample fixing rack (620), a sample temperature acquisition system (630), and a flame temperature acquisition system (640); The sample fixing rack (620) is fixedly connected to the second lead screw slider device (610), and the second lead screw slider device (610) can adjust the height position of the sample fixing rack (620); the sample fixing rack (620) fixes the edge of the noise reduction sample to be tested (00), and the middle part of the noise reduction sample to be tested (00) is suspended; during use, the sample temperature acquisition system (630) is closely attached to the upper surface when the noise reduction sample to be tested (00) is installed; the flame temperature acquisition system (640) is fixed on the sample fixing rack (620), and the temperature measuring probe faces the suspended position in the middle of the lower surface of the noise reduction sample to be tested (00) and maintains a certain distance; A height measurement scale (410) is arranged in the test chamber (4); the height measurement scale (410) is located on one side of the sample table (6).

9. The device for shielding the oil-gas injection fire of a condition transformer in the analog noise reduction device according to claim 7, characterized in that, The video data acquisition system (7) includes a lifting bracket (710) and a video probe (720); the video probe (720) is connected to the lifting bracket (710), and the lifting bracket (710) can adjust the height position of the video probe (720), and the video probe (720) is flush with the spray head (334) of the atomization deflagration device (3) to monitor in real time the spray fire cone angle of the spray head (334), the cracking and falling-off of the noise reduction device; The atomization measurement scale (8) is located on one side of the atomization deflagration device (3) and is flush with the spray head (334) of the atomization deflagration device (3).

10. A method of using a device for blocking the oil-gas injection fire of a condition transformer of the analog noise reduction device according to any one of claims 1-9, characterized in that, Comprising: According to the arc energy to be simulated, the oil-gas mixing device (2) heats the transformer oil transported from the oil barrel (11) to the simulated oil temperature, mixes it with the cracked gas in the cracked gas device (12), and then transports it to the atomization deflagration device (3) for atomizing and igniting the oil-gas mixture to simulate the deflagration process of the oil-gas mixture after actual transformer oil cracking.

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