UHV transformer fire extinguishing test model and method

Abstract

The application discloses a model for extinguishing fire of an extra-high voltage transformer, which comprises a fireproof wall, a spraying pipe, a plurality of spraying heads, a cannon pipe, a fire monitor, a flow adjusting assembly and a range adjusting assembly. The spraying pipe is connected with the spraying heads, and the spraying pipe, the cannon pipe and the fire monitor are all connected on the fireproof wall. The cannon pipe is communicated with the fire monitor. The flow adjusting assembly comprises a movable plate, and the movable plate is connected on the spraying pipe and the cannon pipe and can adjust the depth of extension. The range adjusting assembly comprises a movable pipe, a plurality of different size connection holes are arranged on the movable pipe, and the movable pipe is rotatably connected on the end of the fire monitor and makes the different connection holes communicated with the fire holes of the fire monitor. The application further discloses a method for extinguishing fire of an extra-high voltage transformer. The application has the advantages of increasing a plurality of simulation forms and having the effect of simulation and guidance on extinguishing fire in reality.

Description

Technical Field

[0001] This invention relates to an ultra-high voltage fire extinguishing technology, and more particularly to an ultra-high voltage transformer fire extinguishing test model and method. Background Technology

[0002] With the rapid development of the economy, people's daily life and industrial electricity consumption have also increased rapidly, and the application of ultra-high voltage transformers has also increased. In this environment, once a fire occurs, it will cause incalculable losses. Therefore, by establishing a corresponding fire extinguishing model, fire situations can be effectively simulated. The simulated fire extinguishing situation can facilitate early judgment, deployment and post-fire review in real fire situations.

[0003] For example, publication number CN114297858A discloses a test platform and test method for simulating fires in ultra-high voltage AC transformers. This platform can conduct full-size model fire protection tests on ultra-high voltage AC transformers, obtain real and effective test data on fires in ultra-high voltage AC transformers, and demonstrate the main control factors and key parameters of fire protection.

[0004] However, the aforementioned patents and existing fire extinguishing models cannot simulate the different flow rates of extinguishing agents and the different ranges of fire monitors. The simulations are relatively simple, the simulation results are not very reliable for reference, and the actual fit is not very good. Therefore, we propose an ultra-high voltage transformer fire extinguishing test model and its experimental method.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] The technical problem to be solved by this invention is: how to solve the problem that current fire extinguishing models cannot adjust the flow rate of extinguishing agent and the different ranges of fire monitors, the simulation form is relatively simple, it cannot match reality, and the simulation results are not very reliable for reference.

[0007] The present invention solves the above-mentioned technical problems through the following technical means:

[0008] A fire extinguishing test model for an ultra-high voltage transformer includes a firewall, sprinkler pipes, multiple sprinkler heads, a cannon pipe, a fire monitor, a flow rate adjustment component, and a range adjustment component. The sprinkler pipes are connected to the sprinkler heads, and the sprinkler pipes, cannon pipes, and fire monitors are all connected to the firewall. The cannon pipe is connected to the fire monitor. The flow rate adjustment component includes a movable plate, which is connected to the sprinkler pipes and the cannon pipe to adjust the insertion depth. The range adjustment component includes a movable tube with multiple connecting holes of different sizes. The movable tube is rotatably connected to the end of the fire monitor, allowing the different connecting holes to communicate with the fire holes of the fire monitor.

[0009] This invention uses a movable plate that extends into the depth of the spray pipe and the cannon tube to adjust and control the flow rate within them. This allows for testing the fire extinguishing effect under different flow rates, thus simulating the optimal flow rate of an ultra-high voltage transformer in a real-world fire-fighting environment. The rotation of the movable tube allows for easy connection of different connecting holes with fire hydrants, facilitating the adjustment of the fire monitor's range. This enables the simulation and research of the relationship between range and fire extinguishing effect, allowing for convenient reference to setting the optimal range of the fire monitor based on the model's results. Furthermore, this invention incorporates flow and range adjustment components, adding multiple simulation methods and providing simulation and guidance for real-world fire extinguishing.

[0010] Preferably, the flow regulating component further includes a fixing block connected to the outer surface of the spray pipe or the cannon pipe, and the movable plate can move through the fixing block.

[0011] Preferably, the flow regulating component further includes a movable insert rod, one end of which is connected to the top of the fixed block, the movable plate includes a plurality of locking holes along the height direction, and the other end of the insert rod can engage or disengage from the locking holes.

[0012] Preferably, the flow regulating component further includes a protrusion block connected to the top of the fixed block, the protrusion block having a groove inside, the insertion rod having a T-shaped structure, the large end of the insertion rod being placed in the groove, and the small end extending out of the protrusion block.

[0013] Preferably, the flow regulating component further includes a plurality of first springs, which are evenly spaced and connect the large end of the insertion rod to the inner wall of the protrusion.

[0014] By inserting the end of the insert rod into different locking holes, the insertion depth of the movable plate is controlled, thereby controlling the cross-section of the spray pipe and the barrel, thus affecting the flow rate. It is convenient and flexible to use; the first spring maintains the stability of the locking mechanism.

[0015] Preferably, the fire monitor includes a fixing ring and a fire plate. The fixing ring and the fire plate are fixedly connected to the outside of the fire monitor head at intervals. The fire plate has fire holes. The movable tube includes a sleeve, a support ring, and an adjusting plate. The support ring is connected to one end of the sleeve and is movably sleeved on the fire monitor head between the fixing ring and the fire plate. The adjusting plate includes multiple connecting holes. The adjusting plate is connected to the inner wall of the sleeve and is located at the end of the fire plate away from the fixing ring.

[0016] Preferably, the movable tube further includes a connecting post, and the fixing ring includes a plurality of connecting grooves, with the connecting post connecting into the connecting grooves.

[0017] Preferably, the range adjustment assembly further includes a second spring, which is sleeved on the head of the fire monitor and located inside the sleeve, with its two ends abutting against the fire plate and the support ring, respectively.

[0018] Preferably, there are at least three connecting holes, with the inner diameters of the three connecting holes decreasing in that order, and the inner diameter of the largest connecting hole being the same as the inner diameter of the fire hydrant hole.

[0019] The flow radius of the extinguishing agent is changed by connecting holes with different inner diameters. The smaller the hole diameter, the greater the range, thus allowing for flexible adjustment of the fire monitor's range. The structure is simple.

[0020] During the experiment, the fire extinguishing effect of fire monitors with different ranges can be studied under a fixed flow rate, and the fire extinguishing effect of different flow rates in the pipeline under a fixed range of fire monitors can also be studied.

[0021] This invention also discloses a method using the above-mentioned ultra-high voltage transformer fire extinguishing test model, comprising the following steps:

[0022] Step S01: Ignite the transformer, and after a period of time, start extinguishing the fire by spraying and extinguishing the fire on the transformer through the sprinkler head and fire monitor.

[0023] Step S02: By adjusting the depth of the movable plate inserted into the sprinkler pipe and the fire monitor, the flow rate of the sprinkler pipe and the fire pipe can be controlled; by rotating the movable pipe, different connection holes are connected to the fire monitor's fire hole, thereby controlling the fire monitor's range.

[0024] Step S03: Record the parameters of a single fire extinguishing process.

[0025] The advantages of this invention are:

[0026] (1) This invention adjusts and controls the flow rate in the spray pipe and cannon pipe by extending the movable plate into the depth of the spray pipe and cannon pipe. It can realize the fire extinguishing effect under different flow rates, thereby simulating the optimal flow rate of the UHV transformer when fire extinguishing is required in a real environment. By rotating the movable pipe, different connection holes are connected to the fire hole, which makes it easier to adjust the range of the fire monitor. The relationship between range and fire extinguishing effect can be simulated and studied. The optimal range of the fire monitor can be set according to the model's deduction results. This invention adds a variety of simulation forms through the flow adjustment component and range adjustment component, which has the effect of simulation and guidance for fire extinguishing in reality.

[0027] (2) By inserting the end of the plug rod into different holes, the insertion depth of the movable plate can be controlled, thereby controlling the cross section of the spray pipe and the barrel, thus affecting the flow rate. It is convenient and flexible to use; the first spring maintains the stability when the plug is engaged.

[0028] (3) The outflow radius of the extinguishing agent can be changed by connecting holes with different inner diameters. The smaller the hole diameter, the greater the range, thus allowing for flexible adjustment of the fire monitor's range. The structure is simple. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the ultra-high voltage transformer fire extinguishing test model according to an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the flow regulation component according to an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the flow regulation component according to an embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of the flow regulation component (after partial removal) according to an embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of the connection between the range adjustment component and the fire monitor in an embodiment of the present invention;

[0034] Figure 6 This is a schematic diagram of the range adjustment component (after partial removal) according to an embodiment of the present invention;

[0035] Numbering on the map:

[0036] 1. Firewall;

[0037] 2. Transformer frame; 21. Fan model; 22. Simulated crack;

[0038] 3. Spray assembly; 31. Spray pipe; 32. Spray head;

[0039] 4. Fire monitor assembly; 41. Monitor tube; 42. Fire monitor; 421. Fire hole; 422. Fire board;

[0040] 5. Flow regulating component; 51. Movable plate; 511. Clip hole; 512. Waist-shaped groove; 52. Fixing block; 53. Insert rod; 531. Toggle block; 54. Protrusion block; 55. First spring;

[0041] 6. Range adjustment assembly; 61. Movable tube; 611. Sleeve; 612. Support ring; 613. Adjusting plate; 6131. ​​Connecting hole; 614. Connecting post; 615. Second spring; 62. Fixing ring;

[0042] 7. Oil seepage zone; 8. Oil collection tray. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] Example 1:

[0045] like Figure 1 As shown, the UHV transformer fire extinguishing test model is placed on ground A and includes a firewall 1, a transformer frame 2, a sprinkler assembly 3, a fire monitor assembly 4, a flow regulating assembly 5, a range regulating assembly 6, an oil seepage belt 7, and an oil collection tray 8.

[0046] Firewall 1 is located on both sides of transformer frame 2. Fan models 21 are installed on the outer side of transformer frame 2, and simulated cracks 22 are opened on the outer surface of transformer frame 2 to simulate cracking on the outer surface of transformer frame 2. A cobblestone-lined oil seepage strip 7 is set around the perimeter of transformer frame 2, and an oil collection tray 8 is set on one side of the lower end of transformer frame 2. The fire source is simulated by absorbing gasoline with cotton.

[0047] The sprinkler assembly 3 includes a sprinkler pipe 31 and multiple sprinkler heads 32. The sprinkler pipe 31 is connected to the sprinkler heads 32, and the sprinkler heads 32 are arranged along the length of the firewall 1. The fire monitor assembly 4 includes a monitor pipe 41 and a fire monitor 42, with the monitor pipe 41 and the fire monitor 42 connected. The sprinkler pipe 31 and the monitor pipe 41 are both connected to the side of the firewall 1, and the fire monitor 42 is mounted on the top of the firewall 1. Both the sprinkler pipe 31 and the monitor pipe 41 are powered by micro-pumps to deliver fire extinguishing materials to the sprinkler heads 32 and the fire monitor 42, respectively.

[0048] Both the sprinkler pipe 31 and the cannon pipe 41 are equipped with flow adjustment components 5, and the fire monitor 42 is equipped with a range adjustment component 6 at the head of the monitor.

[0049] Specifically, such as Figure 2 , Figure 3 , Figure 4 As shown, the flow regulating component 5 includes a movable plate 51, a fixed block 52, a plug rod 53, a protrusion block 54, and a first spring 55;

[0050] The bottom end of the fixing block 52 is arc-shaped. The bottom of the fixing block 52 is connected to the outer surface of the spray pipe 31 or the cannon barrel 41. The height of the movable plate 51 is higher than that of the fixing block 52. The fixing block 52 has a through hole along the height direction. The through hole extends all the way to the top of the spray pipe 31. The movable plate 51 can move along the height direction and pass through the fixing block 52.

[0051] like Figure 3 As shown, after removing the top structure of the protrusion 54, it can be seen that the interior of the protrusion 54 is a sliding groove. The insertion rod 53 has a T-shaped structure. A through hole is opened on the side of the protrusion 54. The large end of the insertion rod 53 is placed in the sliding groove, and the small end extends out of the protrusion 54. The large end of the insertion rod 53 is connected to the end face of the sliding groove through three first springs 55. The part of the insertion rod 53 that extends out of the protrusion 54 is a long strip structure, on which a toggle block 531 is provided. The toggle block 531 is used to move the insertion rod 53 by hand.

[0052] The movable plate 51 includes multiple locking holes 511 along its height. A through-hole shaped groove 512 is formed at the top of the movable plate 51, facilitating the lifting of the movable plate 51 by hand. The small end of the insertion rod 53 can engage or disengage from the locking holes 511. The locking holes 511 and the small end of the insertion rod 53 are structurally compatible. In this embodiment, both the locking holes 511 and the small end of the insertion rod 53 are square, but the size of the insertion rod 53 is slightly smaller than the locking holes 511. The multiple locking holes 511 are arranged in a straight line.

[0053] In this embodiment, when it is necessary to increase the flow rate of the spray pipe 31 or the cannon barrel 41, the toggle block 531 is moved, the small end of the insertion rod 53 disengages from the locking hole 511, and the large end of the insertion rod 53 moves within the protrusion block 54 and compresses the first spring 55; the waist-shaped groove 512 is held to lift the insertion rod 53 upwards to a suitable position, and then the toggle block 531 is released. Under the action of the first spring 55, the insertion rod 53 is reinserted into the locking hole 511 located below the original locking hole, and the insertion stability is maintained; at this time, because the cross-section of the spray pipe 31 or the cannon barrel 41 blocked by the insertion rod 53 becomes smaller, the flow rate in the spray pipe 31 or the cannon barrel 41 increases.

[0054] Conversely, when the flow rate of the spray pipe 31 or the cannon barrel 41 needs to be reduced, the toggle block 531 is moved, the small end of the insertion rod 53 disengages from the locking hole 511, and the large end of the insertion rod 53 moves within the protrusion block 54 and compresses the first spring 55; the waist-shaped groove 512 is held and the insertion rod 53 is moved downwards to the appropriate position, and then the toggle block 531 is released. Under the action of the first spring 55, the insertion rod 53 is reinserted into the locking hole 511 located above the original locking hole, and the insertion stability is maintained; at this time, because the cross-section of the channel of the spray pipe 31 or the cannon barrel 41 covered by the insertion rod 53 becomes larger, the flow rate in the spray pipe 31 or the cannon barrel 41 becomes smaller.

[0055] In this embodiment, the movable plate 51 extends into the depth of the spray pipe 31 and the cannon pipe 41, thereby adjusting and controlling the flow rate within the spray pipe 31 and the cannon pipe 41. This allows for testing the fire extinguishing effect under different flow rates, thus simulating the optimal flow rate for a UHV transformer when fire extinguishing is required in a real-world environment. This provides simulation and guidance for real-world fire extinguishing.

[0056] Example 2:

[0057] like Figure 5 , Figure 6 As shown, based on Embodiment 1, the range adjustment component 6 includes a movable tube 61 and a fixed ring 62. The movable tube 61 includes multiple connecting holes 6131 of different sizes. The movable tube 61 can rotatably connect to the end of the fire monitor 42 and make the different connecting holes 6131 communicate with the fire hole 421 of the fire monitor 42.

[0058] Specifically, a fire-fighting plate 422 is connected to the end of the fire monitor 42, and a fire-fighting hole 421 is formed on the fire-fighting plate 422. The fire-fighting plate 422 is fixed to the end of the fire monitor head of the fire monitor 42.

[0059] The fixing ring 62 is fixedly connected to the fire plate 422 at intervals to the outside of the fire monitor head of the fire monitor 42. The fixing ring 62 has a large outer diameter and is a circular ring. The fixing ring 62 is fixed after being sleeved on the outside of the fire monitor head of the fire monitor 42.

[0060] The movable tube 61 includes a sleeve 611, a support ring 612, an adjusting plate 613, a connecting post 614, and a second spring 615. The sleeve 611 is a circular tube with an inner diameter slightly larger than the outer diameter of the fire-fighting plate 422. The support ring 612 is connected to one end of the sleeve 611 and has a ring structure. The inner diameter of the support ring 612 is slightly larger than the outer diameter of the fire nozzle, allowing the support ring 612 to slide along the fire nozzle. The support ring 612 is located between the fixed ring 62 and the fire-fighting plate 422. The adjusting plate 613 includes multiple connecting holes 6131. ​​The adjusting plate 613 is connected to the inner wall of the sleeve 611 and is located at the end of the fire-fighting plate 422 away from the fixed ring 62.

[0061] The sleeve 611 and / or the support ring 612 are connected circumferentially to a plurality of connecting posts 614. The fixing ring 62 includes a plurality of connecting grooves, and the connecting posts 614 are inserted into the connecting grooves. In this embodiment, there are three connecting posts 614 and three connecting grooves, which are evenly arranged.

[0062] The second spring 615 is sleeved on the head of the fire monitor 42 and located inside the sleeve 611. The two ends of the second spring 615 abut against the end face of the fire plate 422 and the end face of the support ring 612, respectively.

[0063] There are three connecting holes 6131, and the inner diameters of the three connecting holes 6131 decrease in that order. The inner diameter of the largest connecting hole 6131 is the same as the inner diameter of the fire hole 421. The diameters of the three connecting holes 6131 are divided into three levels: large, medium, and small in a clockwise direction. The diameters of the medium and small connecting holes 6131 are reduced by 20% from the diameter of the large connecting hole 6131.

[0064] The flow radius of the extinguishing agent can be changed by connecting holes 6131 with different inner diameters. The smaller the hole diameter, the greater the range, thus allowing for flexible adjustment of the range of the fire monitor 42. The structure is simple.

[0065] In this embodiment, assuming the initial state is that the medium-grade connecting hole 6131 is aligned with the fire hole 421, and now the range needs to be increased, the small-grade connecting hole 6131 needs to be aligned with the fire hole 421. The specific operation process is as follows: By pulling the movable tube 61 away from the fixed ring 62, that is, the sleeve 611, support ring 612, and adjusting plate 613 are pulled simultaneously, the distance between the support ring 612 and the fire plate 422 becomes smaller, the second spring 615 is compressed, the connecting post 614 disengages from the connecting groove, and then the movable tube 61 is rotated clockwise to 120°, and then the movable tube 61 is slowly released. Under the reaction force of the second spring 615, the connecting post 614 is just engaged inside the connecting groove, so that the small-grade connecting hole 6131 corresponds to the hole position of the fire hole 421.

[0066] Conversely, if it is necessary to reduce the range, simply rotate the movable tube 61 counterclockwise by 120° after it is pulled out.

[0067] This allows the three sets of holes of different sizes, 6131, to be connected to the holes of fire hole 421 as needed. The smaller the hole diameter, the greater the range, thus allowing for flexible adjustment of the range of the fire monitor 42.

[0068] During the experiment, the fire extinguishing effect of fire monitor 42 with different ranges can be studied under a fixed flow rate, and the fire extinguishing effect of different flow rates in the pipeline under a fixed range of fire monitor 42 can also be studied.

[0069] In this embodiment, the rotation of the movable tube 61 allows different connecting holes 6131 to align with the fire extinguishing hole 421, making it easier to adjust the range of the fire monitor 42. This simulation study reveals the relationship between range and fire extinguishing effect, enabling the optimal range of the fire monitor 42 to be set based on the model's simulation results and real-world conditions. This embodiment also incorporates various simulation methods through the flow adjustment component 5 and the range adjustment component 6, providing simulation and guidance for real-world fire extinguishing.

[0070] Example 3:

[0071] This embodiment discloses a method using the ultra-high voltage transformer fire extinguishing test model described in Embodiment 2 above, including the following steps:

[0072] Step S01: Ignite the transformer, and after a period of time, start extinguishing the fire by spraying and extinguishing the fire on the transformer through the spray head 32 of the spray pipe 31 and the fire monitor 42.

[0073] Specifically, cotton soaked in gasoline is placed inside the transformer frame 2 through the opening of the simulated crack 22, and the cotton is ignited; after 5 minutes, fire extinguishing begins, and the area of ​​the transformer frame 2 is sprayed and extinguishing agent is ejected through the spray head 32 on the spray pipe 31 and the fire monitor 42 to extinguish the fire until the fire is extinguished and then cooled.

[0074] Step S02: By adjusting the depth of the movable plate 51 inserted into the sprinkler pipe 31 and the fire cannon pipe 41, the flow rate of the sprinkler pipe 31 and the fire pipe is controlled; by rotating the movable pipe 61, different connecting holes are connected to the fire hole 421 of the fire cannon 42, thereby controlling the range of the fire cannon 42.

[0075] Specifically, refer to the usage process in Example 1 and Example 2.

[0076] Step S03: Record the parameters of a single fire extinguishing process. Parameters such as the fire control time, extinguishing time, and final cooling temperature are recorded. The fire control time and extinguishing time are recorded using a stopwatch, and the temperature is recorded using an infrared thermometer.

[0077] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A model for fire extinguishing test of an extra-high voltage transformer, characterized in that The application relates to a fire-fighting device which comprises a fire wall, a spray pipe, a plurality of spray heads, a cannon pipe, a fire-fighting cannon, a flow adjusting assembly and a range adjusting assembly, the spray pipe is connected with the spray heads, the spray pipe, the cannon pipe and the fire-fighting cannon are connected on the fire wall, the cannon pipe is communicated with the fire-fighting cannon; the flow adjusting assembly comprises a movable plate which is connected on the spray pipe and the cannon pipe and can adjust the depth of insertion; the range adjusting assembly comprises a movable pipe which comprises a plurality of connection holes with different sizes, the movable pipe is rotatably connected on the end of the fire-fighting cannon and makes the different connection holes communicated with the fire hole of the fire-fighting cannon. The flow adjusting assembly further comprises a fixed block which is connected on the outer surface of the spray pipe or the cannon pipe, and the movable plate can pass through the fixed block. The flow adjusting assembly further comprises a movable plug which is connected with the top of the fixed block at one end, the movable plate comprises a plurality of clamping holes in the height direction, and the other end of the plug can be clamped in or separated from the clamping hole. The end of the fire-fighting cannon is connected with a fire plate, the fire plate is provided with a fire hole, the range adjusting assembly further comprises a fixed ring which is fixedly connected on the outer part of the cannon head of the fire-fighting cannon and is spaced from the fire plate, the movable pipe comprises a sleeve, a supporting ring and an adjusting plate, the supporting ring is connected on one end of the sleeve, the supporting ring is movably sleeved on the cannon head between the fixed ring and the fire plate, the adjusting plate comprises a plurality of connection holes, the adjusting plate is connected on the inner wall of the sleeve and is located on the end of the fire plate away from the fixed ring. The movable pipe further comprises a connecting column, the fixed ring comprises a plurality of connecting grooves, and the connecting column is connected in the connecting grooves. The range adjusting assembly further comprises a second spring which is sleeved on the cannon head of the fire-fighting cannon and is located in the inside of the sleeve, and the two ends of the second spring abut against the fire plate and the supporting ring respectively.

2. The UHV transformer fire test model of claim 1, wherein, The flow adjusting assembly further comprises a convex block which is connected on the top end of the fixed block, the convex block is a sliding groove, the plug is a T-shaped structure, the large end of the plug is located in the sliding groove, and the small end of the plug extends out of the convex block.

3. The UHV transformer fire test model of claim 2, wherein, The flow adjusting assembly further comprises a plurality of first springs which are uniformly spaced and connected on the large end of the plug and the inner wall of the convex block.

4. The UHV transformer fire test model of claim 1, wherein, The connection holes are at least three, the inner diameters of the three connection holes decrease, and the inner diameter of the largest connection hole is the same as the inner diameter of the fire hole.

5. The method of extinguishing a test model of an ultra-high voltage transformer according to any one of claims 1 to 4, characterized in that, The application further discloses a fire-fighting method which comprises the following steps: Step S01: igniting the transformer, starting to extinguish the fire after a period of time, and spraying and extinguishing the transformer through the spray heads of the spray pipe and the fire-fighting cannon; Step S02: adjusting the depth of the movable plate inserted into the spray pipe and the cannon pipe to control the flow of the spray pipe and the fire-fighting pipe, and rotating the movable pipe to make the different connection holes communicated with the fire hole of the fire-fighting cannon to control the range of the fire-fighting cannon; Step S03: recording the parameters of a single extinguishing process.

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