Converter transformer oil pit fire test platform and test method

Abstract

The present invention discloses a test platform and test method for fire insulation test of oil pit of converter transformer, including simulated overflow fire source, flame retardant fire insulation layer, simulated oil pillow, matching fire extinguishing system, matching measurement and control system; the test method includes: simulated oil pillow oil filling preheating, open oil pool oil filling, open oil pool ignition, flow recording, flame retardant fire insulation layer fire extinguishing, open oil pool fire extinguishing, closing test platform, and repeated test. The advantages of the present invention are: providing a test platform and test method for fire insulation test of oil pit of converter transformer, reconstructing the accident oil pit fire scene caused by overflow fire of converter transformer, realizing the influence of different flame retardant fire insulation materials and different flame retardant layer thickness on the flame retardant fire insulation effect of oil pit, the influence of fire water extinguishing process on fire spread, the risk of oil-water mixture overflowing accident oil pit during fire water extinguishing process, and the effectiveness of bottom fixed fire extinguishing system protecting accident oil pit and the optimization design of nozzle parameters.

Description

Technical Field

[0001] The invention relates to the field of electrical engineering, and in particular to a converter transformer oil pit fire isolation test platform and a test method. Background Art

[0002] The converter station is an important hub of the power system. It is a station established in the high-voltage direct current transmission system to complete the conversion of alternating current into direct current or direct current into alternating current, and to meet the requirements of the power system for safety, stability and power quality. The safe and reliable operation of the converter station is the basis for the normal operation of the power system. The converter station contains a large number of oil-containing equipment, such as converter transformers, high-voltage shunt reactors, etc., and a basic oil pit must be established. The oil pit of oil-immersed electrical equipment must be equipped with a flame retardant layer to eliminate safety hazards. The oil pit flame retardant layer structure is the first protective barrier set up in advance to ensure the rapid penetration and safe isolation of flammable transformer oil during normal discharge or accidental dumping. When a fire accident occurs, how to quickly penetrate and prevent the leaked high-temperature hot oil from gathering to form an oil pool fire and flowing fire, and how to prevent the flame from burning through the flame retardant layer and entering the bottom of the oil pit, spreading to the adjacent converter transformer, causing the accident to expand, is the main function of the flame retardant layer structure of the converter transformer oil pit.

[0003] At present, the research on converter transformer fire mainly focuses on the risk analysis, monitoring and early warning, and fire extinguishing technology of the converter transformer body fire, and there is little involvement in the reconstruction of the flame retardant fire test of the oil pit at the bottom of the converter transformer. For example, the Chinese invention patent application with the publication number CN110992803A discloses an oil-immersed transformer fire model and fire simulation method, including a transformer body model and an oil collection pit model, a jet fire model, a flowing fire model, and a high-voltage bushing burst fire model built around the transformer body model. It simulates various fire conditions that may occur when a transformer body fire occurs to simulate the situation when an oil-immersed transformer fire occurs; and the fire simulation through the oil-immersed transformer fire model provides a guarantee for verifying the effectiveness of various fire extinguishing systems in extinguishing oil-immersed transformer fires. The reconstruction of the oil pit fire of the converter transformer is an important issue in solving the problem of the spread of the fire in the converter transformer. Carrying out flame retardant and fireproofing tests on the oil pit of the converter transformer can, on the one hand, provide a basis for the selection of flame retardant layer materials for the accident oil pit of the converter transformer and the optimization design of the nozzles of the bottom fixed fire extinguishing system for protecting the accident oil pit. On the other hand, it is conducive to fire investigation, disaster mechanism inversion, risk assessment, etc.

[0004] At present, the fire protection design of the oil pit of the converter transformer is mainly based on GB50229-2019 "Design Fire Protection Code for Thermal Power Plants and Substations": "The thickness of the pebble layer in the oil pit fire insulation layer should not be less than 250mm, and the pebble diameter should be 50-80mm." However, recent typical cases of converter transformer fire accidents have shown that this requirement cannot meet the flame retardant fire protection needs of large oil-filled equipment fires, which can easily cause fuel to accumulate to form oil pool fires and flowing fires. At the same time, there is a risk of high-temperature oil spreading through the oil pit and causing the accident to expand. Therefore, it is urgent to carry out the fire insulation performance test of the oil pit of the converter transformer accident to provide support for the research on the disaster mechanism of the oil pit fire of the converter transformer and the design of the flame retardant layer. Summary of the invention

[0005] The purpose of the present invention is to provide a converter transformer oil pit fire test platform and test method, which can reconstruct the accident oil pit fire scene that may be caused by the converter transformer fire, realize the research on the fire retardant fireproofing effect of different flame retardant fireproofing materials and different flame retardant layer thicknesses on the oil pit, and the research on the penetration performance of different flame retardant materials. It can also conduct a comprehensive and systematic research on the risk of oil-water mixture overflow in the accident oil pit during the fire water extinguishing process, the risk of fire spread, and the effectiveness of various fire fighting technologies.

[0006] The present invention solves the above technical problems through the following technical means: a converter transformer oil pit fire isolation test platform, including a simulated overflow fire source, a flame retardant fire isolation layer, a simulated oil pillow, a matching fire extinguishing system, and a matching measurement and control system;

[0007] The simulated overflow fire source includes a simulated oil pit and an open oil pool arranged above the simulated oil pit, the simulated oil pit leads to an external accident oil collection pool, the flame retardant fire insulation layer covers the simulated oil pit, and the flame retardant fire insulation layer is located below the open oil pool;

[0008] The simulated oil pillow comprises a simulated oil pillow cavity and an oil pillow heating device arranged in the simulated oil pillow cavity, and the simulated oil pillow cavity leads to an open oil pool;

[0009] The supporting measurement and control system includes an ignition system capable of igniting an open oil pool, a temperature acquisition system capable of collecting simulated overflow fire source temperature and simulated oil pillow temperature, an image acquisition system capable of collecting simulated oil pit internal images and simulated overflow fire source images, and a flow acquisition system capable of collecting simulated flow from the oil pillow cavity to the open oil pool and simulated flow from the oil pit to an external accident oil collecting pool.

[0010] When the converter transformer oil pit fire isolation test platform of the present invention is actually used, the oil pillow heating device preheats the transformer oil in the simulated oil pillow cavity to facilitate subsequent combustion, the preheated transformer oil is injected into the open oil pool, the ignition system ignites the transformer oil in the open oil pool, the transformer oil is continuously injected into the open oil pool, the burning transformer oil overflows from the open oil pool, thereby simulating an overflow fire source, the flame retardant fire isolation layer is used to prevent combustion and prevent the flowing fire from entering the simulated oil pit, and the transformer oil flowing into the simulated oil pit leads to the accident oil collection pool of the external device, During the test, according to the fire situation, the fire can be extinguished through the supporting fire extinguishing system. The temperature acquisition system collects the simulated overflow fire source temperature and the simulated oil pillow temperature. The image acquisition system collects the simulated oil pit internal image and the simulated overflow fire source image. The flow acquisition system collects the simulated oil pillow cavity to the open oil pool flow and the simulated oil pit to the external accident oil collection pool flow, thereby simulating three scenarios: high-temperature hot oil flowing to the oil pit surface after the transformer bushing bursts, oil pit surface fire, and oil pit bottom fire. It can truly reproduce the high-temperature hot oil fire of the converter transformer fire. In the development and evolution process, in the flame retardant fireproofing test and fire protection of the converter transformer oil pit, the test platform can realize the test of the barrier effect of different flame retardant fireproofing materials and different flame retardant layer thicknesses on the fire in the oil pit under the converter transformer fire scenario, as well as the penetration performance test of different flame retardant materials, so as to provide a basis for the selection and design of the flame retardant layer material of the oil pit; in the risk assessment of the spread of the oil pit fire of the converter transformer, the test platform can realize the study of the influence of the fire fighting water extinguishing process on the spread of the fire, as well as the risk study of the oil-water mixture overflowing the oil pit during the fire fighting water extinguishing process, and can also provide a basis for the optimization design of the nozzle of the protection fixed fire extinguishing system; therefore, this test platform is a test platform specially used to carry out a comprehensive and systematic reconstruction of the occurrence, development and spread of the oil pit fire caused by the overflow fire of the converter transformer, and at the same time, it can realize the test of the fireproofing effect of the flame retardant fireproofing layer, the penetration performance test of different flame retardant materials, the risk test of the spread or overflow of the oil pit of the oil-water mixture during the fire fighting process, the performance test and evaluation of the fixed fire extinguishing system, etc., which can truly reproduce the development process of the high-temperature hot oil fire of the converter transformer fire, and at the same time ensure the repeatability of the test.

[0011] Optimally, the open oil pool is a rectangular parallelepiped with an opening on the top, and at least two simulated oil overflow grooves are provided on the long side walls on both sides of the open oil pool, and the horizontal spacing between two adjacent simulated oil overflow grooves is equal. Along the length direction of the open oil pool, the position of the simulated oil overflow groove gradually increases, and the vertical spacing between two adjacent simulated oil overflow grooves is equal.

[0012] In terms of the design of converter transformer fire scenarios, the test platform is designed with multiple simulated oil overflow tanks of different heights to simulate fire scenarios with different numbers of bushing bursting and overflowing, including three scenarios: high-temperature hot oil flowing to the surface of the oil pit after different numbers of bushings bursting, fire on the surface of the oil pit, and fire at the bottom of the oil pit. It can truly reproduce the development and evolution process of high-temperature hot oil fire in the converter transformer fire.

[0013] Optimally, the open oil pool is a rectangular parallelepiped with an open top, and the projection of the open oil pool in the vertical direction is located within the range of the simulated oil pit.

[0014] Optimally, the flame retardant and fireproofing layer comprises a steel fixed net and a flame retardant and fireproofing material placed in the steel fixed net;

[0015] A support frame is arranged in the simulated oil pit, the steel fixed net is placed on the support frame, and the steel fixed net covers the simulated oil pit.

[0016] During the actual test, different types of flame retardant and fireproofing materials can be replaced in the steel fixed net and laid with different thicknesses to test the flame retardant and fireproofing effects of flame retardant and fireproofing layers of different types and thicknesses. The structure is simple and the installation is convenient.

[0017] Optimized, the supporting fire extinguishing system includes a fixed water sprinkler fire extinguishing system and a mobile water fire truck. The fixed water sprinkler fire extinguishing system can spray toward the flame retardant fire insulation layer, and the mobile water fire truck can spray toward the open oil pool.

[0018] Optimized, the fixed water sprinkler fire extinguishing system includes two rows of nozzles symmetrically arranged on both sides of the flame retardant fire insulation layer, the nozzles are all horizontally facing the flame retardant fire insulation layer, each row of nozzles is 0.3-0.5m away from the edge of the flame retardant fire insulation layer, in each row of nozzles, the distance between two adjacent nozzles is 0.6-1.5m, and the nozzle is 0.5-1.0m away from the ground;

[0019] The mobile water fire fighting truck is 5-10m away from the flame retardant fire insulation layer and has a water carrying capacity of 6-10t.

[0020] Optimally, the temperature acquisition system includes an infrared camera placed 4-8m away from the edge of the flame retardant fire insulation layer, and the infrared camera is 2.5-3.5m away from the ground;

[0021] Also included are thermocouples installed in the open oil pool and the simulated oil conservator;

[0022] It also includes a temperature data acquisition system connected to an infrared camera and a thermocouple.

[0023] The infrared camera can record the test process and collect temperature data during the test. The thermocouple is used to detect the temperature in the open oil pool and the simulated oil pillow. The temperature data acquisition system is used to collect and store the information recorded or detected by the infrared camera and thermocouple.

[0024] Optimally, the image acquisition system includes two ground cameras placed on both sides of the flame retardant fire insulation layer;

[0025] It also includes a high-definition video camera arranged in a simulated oil pit, and a miniature camera arranged in a passage from the simulated oil pit to an external accident oil collection tank;

[0026] It also includes a multi-channel video data acquisition system connected to a ground camera, a high-definition video camera, and a miniature camera.

[0027] The ground camera records the external fire situation, the high-definition video camera records the fire situation in the simulated oil pit, the micro camera is used to observe whether the flow in the channel from the simulated oil pit to the external accident oil collection pool is smooth, and the multi-channel video data acquisition system is used to record and store the recordings of the ground camera, high-definition video camera, and micro camera.

[0028] Optimally, the flow acquisition system includes flow indicator probes arranged in the passage from the simulated oil pillow cavity to the open oil pool and in the passage from the simulated oil pit to the accident oil collection pool of the external device;

[0029] Also included is a flow data acquisition system connected to the flow indicator probe.

[0030] The flow indicator probe detects the flow rate in the channel from the simulated oil pillow cavity to the open oil pool and in the channel from the simulated oil pit to the external accident oil collecting pool, and the flow data acquisition system collects and records the flow rate.

[0031] The present invention also discloses a test method using any one of the above converter transformer oil pit fire isolation test platforms, comprising the following steps:

[0032] s1. Simulate oil conservator oil filling preheating:

[0033] Closing the passage from the simulated oil pillow cavity to the open oil pool, injecting transformer oil into the simulated oil pillow cavity, and preheating the transformer oil using the oil pillow heating device;

[0034] s2. Open oil pool filling:

[0035] Inject the preheated transformer oil in the simulated oil pillow cavity into the open oil pool;

[0036] s3, open oil pool ignition:

[0037] Use the ignition system to ignite the transformer oil in the open oil pool, and continue to inject transformer oil into the open oil pool. When the flame continues to burn autonomously for no less than 20 seconds, turn off the ignition system;

[0038] s4. Traffic records:

[0039] Start timing from the time the ignition system is turned off, and record the flow rate of the channel from the simulated oil pillow cavity to the open oil pool every t, with t not exceeding 15s. At the same time, observe and record the changes in the fire intensity of the upper and lower parts of the flame retardant fire insulation layer during the process of the open oil pool overflowing and flowing into the simulated oil pit. If the bottom of the simulated oil pit is on fire, observe whether there is fire entering the channel from the simulated oil pit to the external accident oil collection pool;

[0040] s5. Fire extinguishing with flame retardant fire barrier:

[0041] If the bottom of the simulated oil pit is on fire, start the supporting fire extinguishing system to cool down the fire point on the flame retardant fire insulation layer, and observe the fire situation on the flame retardant fire insulation layer of the simulated oil pit and the fire situation at the bottom of the simulated oil pit through the image acquisition system;

[0042] s6. Open oil pool fire extinguishing:

[0043] When it is confirmed that the bottom of the flame retardant fireproof layer is on fire, the supporting fire extinguishing system is started to extinguish the open oil pool. The temperature acquisition system records the temperature of the open oil pool. The image acquisition system records the fire extinguishing process, the change of the fire intensity, whether there is oil-water mixture overflowing to the ground around the open oil pool, and observes whether the drainage at the bottom of the simulated oil pit is unobstructed, and the flow rate from the simulated oil pit to the external accident oil collection pool, that is, the penetration rate of the flame retardant fireproof layer;

[0044] s7. Close the test platform:

[0045] After the open flames in the open oil pool and the upper and lower parts of the flame-retardant fire insulation layer are completely extinguished, close the passage from the simulated oil pillow cavity to the open oil pool, and the supporting fire extinguishing system continues to spray until the oil temperature in the open oil pool drops below 100°C, and then continue to spray for 10-30 seconds before the spraying ends. At the end of the test, turn off the supporting measurement and control system, and save the data, photos, and videos;

[0046] s8. Replace the flame retardant and fire insulation layer with different thickness and different flame retardant and fire insulation materials, and repeat steps s1-s7 to implement the fire insulation test of the flame retardant and fire insulation layer with different thickness and different flame retardant and fire insulation materials.

[0047] Through the above test method, three scenarios can be simulated: high-temperature hot oil flowing to the surface of the oil pit after the transformer bushing explodes, fire on the surface of the oil pit, and fire at the bottom of the oil pit. The development and evolution process of the high-temperature hot oil fire in the converter transformer fire can be truly reproduced. In terms of flame retardant and fireproofing testing and fire protection of the converter transformer oil pit, the test platform can realize the fire barrier effect test of different flame retardant and fireproofing materials and different flame retardant layer thicknesses in the oil pit under the converter transformer fire scenario, as well as the penetration performance test of different flame retardant materials, thereby providing a basis for the selection and design of the oil pit flame retardant layer material; in terms of the risk assessment of the spread of the converter transformer oil pit fire, the test platform can realize the fire extinguishing process of the fire water. The study on the impact on the spread of fire and the risk of oil-water mixture overflowing into the oil pit during the fire-fighting water extinguishing process can also provide a basis for the optimal design of sprinkler protection for fixed fire-fighting systems. Therefore, this test method is a test method specifically used to carry out a comprehensive and systematic reconstruction of the occurrence, development and spread of oil pit fires caused by overflow fires in converter transformers. At the same time, it can realize the fire-insulating effect test of flame-retardant insulation layers, the penetration performance test of different flame-retardant materials, the risk test of oil-water mixture spreading or overflowing into the oil pit during the fire-fighting process, the performance test and evaluation of fixed fire-fighting systems, etc. It can truly reproduce the development process of high-temperature hot oil fires in converter transformer fires, while ensuring the repeatability of the test.

[0048] The advantages of the present invention are:

[0049] 1. When the converter transformer oil pit fire test platform of the present invention is actually used, the oil pillow heating device preheats the transformer oil in the simulated oil pillow cavity to facilitate subsequent combustion, and the preheated transformer oil is injected into the open oil pool. The ignition system ignites the transformer oil in the open oil pool. The transformer oil is continuously injected into the open oil pool, and the burning transformer oil overflows from the open oil pool, thereby simulating an overflow fire source. The flame retardant fire insulation layer is used to prevent combustion and prevent the flowing fire from entering the simulated oil pit. The transformer oil flowing into the simulated oil pit is led to the accident oil collection of the external device. Pool. During the test, according to the fire situation, the fire can be extinguished through the supporting fire extinguishing system. The temperature acquisition system collects the simulated overflow fire source temperature and the simulated oil pillow temperature. The image acquisition system collects the simulated oil pit internal image and the simulated overflow fire source image. The flow acquisition system collects the simulated oil pillow cavity to the open oil pool flow and the simulated oil pit to the external accident oil collection pool flow, thereby simulating the three scenarios of high-temperature hot oil flowing to the oil pit surface after the transformer bushing bursts, oil pit surface fire, and oil pit bottom fire. It can truly reproduce the high-temperature hot oil fire of the converter transformer fire In the flame retardant fireproofing test and fire protection of converter transformer oil pit, the test platform can realize the test of the barrier effect of different flame retardant fireproofing materials and different flame retardant layer thicknesses on the fire in the oil pit under the converter transformer fire scenario, as well as the penetration performance test of different flame retardant materials, so as to provide a basis for the selection and design of the flame retardant layer material of the oil pit; in the risk assessment of the spread of oil pit fire in the converter transformer, the test platform can realize the study of the influence of the fire fighting water extinguishing process on the spread of fire, as well as the risk study of the oil-water mixture overflowing the oil pit during the fire fighting water extinguishing process, and can also provide a basis for the optimization design of the nozzle of the protection fixed fire extinguishing system; therefore, this test platform is a test platform specially used to carry out a comprehensive and systematic reconstruction of the occurrence, development and spread of oil pit fire caused by overflow fire of converter transformer, and can also realize the test of the fireproofing effect of the flame retardant fireproofing layer, the penetration performance test of different flame retardant materials, the risk test of the spread or overflow of the oil pit of the oil-water mixture during the fire fighting process, the performance test and evaluation of the fixed fire extinguishing system, etc., which can truly reproduce the development process of the high-temperature hot oil fire of the converter transformer fire, and at the same time ensure the repeatability of the test.

[0050] 2. In terms of the design of converter transformer fire scenarios, the test platform is designed with multiple simulated oil overflow tanks of different heights to simulate fire scenarios caused by different numbers of bushing bursting and overflowing, including three scenarios: high-temperature hot oil flowing to the surface of the oil pit after different numbers of bushings bursting, fire on the surface of the oil pit, and fire at the bottom of the oil pit. It can truly reproduce the development and evolution process of high-temperature hot oil fire in the converter transformer fire.

[0051] 3. During the actual test, different types of flame retardant and fireproofing materials can be replaced in the steel fixed net, and different thicknesses can be laid to test the flame retardant and fireproofing effects of flame retardant and fireproofing layers of different types and thicknesses. The structure is simple and easy to install.

[0052] 4. The infrared camera can record the test process and collect temperature data during the test. The thermocouple is used to detect the temperature in the open oil pool and the simulated oil pillow. The temperature data acquisition system is used to collect and store the information recorded or detected by the infrared camera and thermocouple.

[0053] 5. The ground camera records the external fire situation, the high-definition video camera records the fire situation in the simulated oil pit, the micro camera is used to observe whether the flow in the channel from the simulated oil pit to the external accident oil collection pool is smooth, and the multi-channel video data acquisition system is used to record and store the recordings of the ground camera, high-definition video camera, and micro camera.

[0054] 6. The flow indicator probe detects the flow rate in the channel from the simulated oil pillow cavity to the open oil pool and in the channel from the simulated oil pit to the external accident oil collecting pool. The flow data acquisition system collects and records the flow rate.

[0055] 7. Through the above test method, three scenarios can be simulated: high-temperature hot oil flowing to the surface of the oil pit after the transformer bushing explodes, fire on the surface of the oil pit, and fire at the bottom of the oil pit. The development and evolution process of the high-temperature hot oil fire in the converter transformer fire can be truly reproduced. In terms of flame retardant and fireproofing testing and fire protection of the oil pit of the converter transformer, the test platform can realize the fire barrier effect test of different flame retardant and fireproofing materials and different flame retardant layer thicknesses in the oil pit under the converter transformer fire scenario, as well as the penetration performance test of different flame retardant materials, thereby providing a basis for the selection and design of the oil pit flame retardant layer material; in terms of the risk assessment of the spread of the oil pit fire of the converter transformer, the test platform can realize the fire extinguishing process of the fire water. The study on the influence of the process on the spread of fire, as well as the risk of oil-water mixture overflowing from the oil pit during the fire-fighting water extinguishing process, can also provide a basis for the optimization design of the sprinkler head of the fixed fire-fighting system; therefore, this test method is a test method specially used to carry out a comprehensive and systematic reconstruction of the occurrence, development and spread of oil pit fires caused by overflow fires in converter transformers. At the same time, it can realize the fire-insulating effect test of the flame-retardant fire-insulating layer, the penetration performance test of different flame-retardant materials, the risk test of oil-water mixture spreading or overflowing from the oil pit during the fire-fighting process, the performance test and evaluation of the fixed fire-fighting system, etc. It can truly reproduce the development process of high-temperature hot oil fire in converter transformer fire, and at the same time ensure the repeatability of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 It is a structural schematic diagram of a converter transformer oil pit fire isolation test platform in an embodiment of the present invention;

[0057] Figure 2 A schematic diagram of a simulated overflow fire source in an embodiment of the present invention;

[0058] Figure 3 is a schematic diagram of a support frame in an embodiment of the present invention;

[0059] Figure 4 Schematic diagram of a flame retardant fireproof layer in an embodiment of the present invention;

[0060] Figure 5 A schematic diagram of a simulated oil pillow in an embodiment of the present invention;

[0061] Figure 6 This is a schematic diagram of the arrangement of high-definition video cameras simulating the bottom of an oil pit in an embodiment of the present invention;

[0062] Figure 7 A schematic diagram of the arrangement of a fire extinguishing system and ground cameras in an embodiment of the present invention;

[0063] in,

[0064] Simulated overflow fire source-1, simulated oil pit-11, open oil pool-12, support frame-111, oil discharge pipeline-112, simulated oil overflow tank-121;

[0065] Flame retardant fire insulation layer-2, steel fixed net-21, flame retardant fire insulation material-22;

[0066] Simulated oil pillow-3, simulated oil pillow cavity-31, oil pillow heating device-32, oil pipeline-33;

[0067] Supporting fire extinguishing system-4, fixed water sprinkler fire extinguishing system-41, mobile water fire truck-42, sprinkler-411; supporting measurement and control system-5, ignition system-51, temperature acquisition system-52, image acquisition system-53, flow acquisition system-54, infrared camera-521, thermocouple-522, ground camera-531, high-definition video camera-532, miniature camera-533, flow indicator probe-541, flow control valve-542. DETAILED DESCRIPTION

[0068] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0069] Embodiment 1:

[0070] like Figure 1 , 7 As shown, a converter transformer oil pit fire isolation test platform includes a simulated overflow fire source 1, a flame retardant fire isolation layer 2, a simulated oil pillow 3, a matching fire extinguishing system 4, and a matching measurement and control system 5.

[0071] For ease of description and understanding, Figure 1 The viewing angle is the main view angle for observing from the front, and the other directions are based on this.

[0072] like Figure 1 As shown, the simulated overflow fire source 1 includes a simulated oil pit 11 and an open oil pool 12 arranged above the simulated oil pit 11. The simulated oil pit 11 leads to an external accident oil collection pool (not shown in the figure). The simulated oil pit 11 leads to the external accident oil collection pool through an oil drain pipe 112. The oil drain pipe 112 is made of a stainless steel seamless welded steel pipe with a pipe diameter of not less than DN60. The flame retardant fire insulation layer 2 covers the simulated oil pit 11, and the flame retardant fire insulation layer 2 is located below the open oil pool 12. In this embodiment, the simulated oil pit 11 is opened on the ground.

[0073] like Figure 2 As shown, the open oil pool 12 is a rectangular parallelepiped with an opening on the top, and at least two simulated oil overflow grooves 121 are provided on the long side walls on both sides of the open oil pool 12. In this embodiment, three simulated oil overflow grooves 121 are provided on the long side walls on each side of the open oil pool 12. The length of the simulated oil overflow groove 121 is 0.6m, and the depth is 0.1m. The horizontal spacing between two adjacent simulated oil overflow grooves 121 is equal. Along the length direction of the open oil pool 12, the position of the simulated oil overflow groove 121 gradually increases, and the vertical spacing between two adjacent simulated oil overflow grooves 121 is equal. The vertical distances between the center points of the three simulated oil overflow grooves 121 and the top of the open oil pool 12 are 0.25m, 0.15m, and 0.05m, respectively.

[0074] like Figure 1 As shown, the projection of the open oil pool 12 in the vertical direction is located within the range of the simulated oil pit 11, the length, width and height of the open oil pool 12 are 3m, 1m and 0.5m respectively, the length direction of the open oil pool 12 is along the left-right direction, the bottom of the open oil pool 12 is 3.5m from the ground, and the four sides of the open oil pool 12 corresponding to the simulated oil pit 11 are 2-3m apart. In this embodiment, the four sides of the open oil pool 12 corresponding to the simulated oil pit 11 are 2m apart, and the open oil pool 12 is fixed above the simulated oil pit 11 by a bracket.

[0075] like Figure 1 , 4 As shown, the flame retardant fireproofing layer 2 includes a steel fixed net 21 and a flame retardant fireproofing material 22 placed in the steel fixed net 21; the mesh size of the steel fixed net 21 is 10-20 mm, and the steel fixed net 21 can be woven from steel wires and made into a sheet steel grid according to set specifications and dimensions. The flame retardant fireproofing material 22 can be made of pebbles or new ceramic foam glass particles, and the particle size of the flame retardant fireproofing material 22 ranges from 25 to 100 mm.

[0076] like Figure 3As shown, a support frame 111 is provided in the simulated oil pit 11. The support frame 111 is a steel support frame. The main frame around it is embedded in the four walls of the simulated oil pit 11, and the embedding depth is not less than 0.1m. The surface load-bearing capacity of the support frame 111 is not less than 600kg / m 2 The steel fixed net 21 is placed on the support frame 111, and the steel fixed net 21 covers the simulated oil pit 11. Specifically, the steel grids encapsulating the flame retardant and fireproofing material 22 are connected to each other through the support frame 111 to cover the top of the simulated oil pit 11. By pre-setting steel grids with different encapsulation thicknesses, the thickness of the flame retardant and fireproofing layer 2 can be changed. In specific implementation, only one layer of steel grids can be laid on the support frame 111, and the space between the steel grids and the four walls of the simulated oil pit 11 can be filled with flame retardant and fireproofing materials 22 of different thicknesses. In addition, while laying a layer of steel grids on the support frame 111, four steel grids can be set around the bottom steel grid, and the space surrounded by the steel grids can be filled with flame retardant and fireproofing materials 22, and then the top of the flame retardant and fireproofing material 22 can be sealed with steel grids. Each steel grid can be connected by bolts and nuts or steel wires.

[0077] like Figure 5 As shown, the simulated oil pillow 3 includes a simulated oil pillow cavity 31 and an oil pillow heating device 32 arranged in the simulated oil pillow cavity 31. The oil pillow heating device 32 adopts an arc electric heating device, and the arc electric heating device adopts electric heating wire circulation heating, and the heating power range is 5-50kW. The simulated oil pillow cavity 31 leads to the open oil pool 12, and the simulated oil pillow cavity 31 leads to the open oil pool 12 through an oil pipeline 33. The oil pipeline 33 adopts a stainless steel seamless welded steel pipe with a pipe diameter not less than DN60. A flow control valve 542 is arranged in the oil pipeline 33 from the simulated oil pillow cavity 31 to the open oil pool 12. The flow control valve 542 is manual or automatic. When set to automatic, the flow control valve 542 can adopt an electric butterfly valve, and an external PLC or the like can be used to control the flow control valve 542.

[0078] The length, width and height of the simulated oil pillow 3 are 5-8m, 1-2m and 2-3m respectively. In this embodiment, the length, width and height of the simulated oil pillow 3 are 5m, 1m and 2m respectively. The length direction of the simulated oil pillow 3 is along the front-to-back direction. The transformer oil in the simulated oil pillow 3 is one of KI-50X and K25. The oil volume in the simulated oil pillow 3 is 2-8t, which is 2t in this embodiment. The bottom of the simulated oil pillow 3 is at least 0.5m higher than the top of the open oil pool 12, and the simulated oil pillow 3 is erected above the ground by a bracket.

[0079] like Figure 7As shown, the supporting fire extinguishing system 4 includes a fixed water sprinkler fire extinguishing system 41 and a mobile water fire truck 42. The fixed water sprinkler fire extinguishing system 41 can spray toward the flame retardant fire insulation layer 2, and the mobile water fire truck 42 can spray toward the open oil pool 12. Additional interfaces are reserved in the converter transformer oil pit fire insulation test platform, which can be used to set up other types of fire extinguishing systems in the platform. The reserved interfaces can be closed when not in use.

[0080] like Figure 7 As shown, the fixed water sprinkler fire extinguishing system 41 includes two rows of nozzles 411 symmetrically arranged on the front and rear sides of the flame retardant fire insulation layer 2, the nozzles 411 are all horizontally facing the flame retardant fire insulation layer 2, each row of nozzles 411 is 0.3-0.5m away from the edge of the flame retardant fire insulation layer 2, and 0.3m in this embodiment, 6 nozzles 411 are arranged in each row, and the nozzles 411 adopt medium-speed water sprinkler nozzles. In each row of nozzles 411, the distance between two adjacent nozzles 411 is 0.6-1.5m, and 0.6m in this embodiment, and the distance between the nozzles 411 and the ground is 0.5-1.0m, and 0.5m in this embodiment. The fixed water sprinkler fire extinguishing system 41 can be controlled by a control unit such as PLC, the mobile water fire truck 42 is 5-10m away from the flame retardant fire insulation layer, and 5m in this embodiment, and the water carrying capacity is 6-10t, and 6t in this embodiment, and the mobile water fire truck 42 is located on the left side of the flame retardant fire insulation layer 2.

[0081] like Figure 1 , 2 As shown, the supporting measurement and control system 5 includes an ignition system 51 capable of igniting the open oil pool 12, a temperature acquisition system 52 capable of acquiring the temperature of the simulated overflow fire source 1 and the temperature of the simulated oil pillow 3, an image acquisition system 53 capable of acquiring the internal image of the simulated oil pit 11 and the image of the simulated overflow fire source 1, and a flow acquisition system 54 capable of acquiring the flow from the simulated oil pillow cavity 31 to the open oil pool 12 and the flow from the simulated oil pit 11 to the external accident oil collecting pool.

[0082] like Figure 2 As shown, the ignition system 51 adopts an arc ignition device, which is a prior art and is arranged at the opening of the open oil pool 12.

[0083] The entire test can also be controlled by a control unit. The control unit can adopt PLC. PLC is a prior art, and those skilled in the art can implement corresponding control by programming according to requirements.

[0084] The arc ignition device is controlled by a PLC, and ignition can be started by powering on or stopped by powering off by controlling the power on and off of the arc ignition device. The power on and off of the arc ignition device can realize remote automatic control.

[0085] like Figure 1As shown, the temperature collection system 52 includes an infrared camera 521 placed 4-8m away from the edge of the flame retardant fire insulation layer 2, which is 4m in this embodiment. The infrared camera 521 is 2.5-3.5m away from the ground, which is 2.5m in this embodiment. The infrared camera 521 is located on the left side of the flame retardant fire insulation layer 2.

[0086] like Figure 2 , 5 As shown, it also includes thermocouples 522 installed in the open oil pool 12 and the simulated oil pillow 3; the thermocouples 522 all adopt high-precision K-type thermocouples, and the positions of the thermocouples 522 in the open oil pool 12 are: the thermocouples 522 are arranged on the left and right side walls of the open oil pool 12, three are arranged on each side wall, one is arranged in the middle position of the front and back of each side wall, and one is arranged 0.2m in front and behind the middle thermocouple 522, and the six thermocouples 522 in the open oil pool 12 are equal in height.

[0087] like Figure 5 As shown, the thermocouples 522 in the simulated oil pillow 3 are arranged at the center position of the front and back of the simulated oil pillow cavity 31, and one on each side 0.15m away from the center position horizontally, and all thermocouples 522 in the simulated oil pillow 3 are of equal height.

[0088] It also includes a temperature data acquisition system connected to the infrared camera 521 and the thermocouple 522 . The temperature data acquisition system is a prior art and can display and record the temperature values ​​detected by the infrared camera 521 and the thermocouple 522 .

[0089] like Figure 7 As shown, the image acquisition system 53 includes two ground cameras 531 placed on the front and rear sides of the flame retardant fire insulation layer 2. The two ground cameras 531 are 5m away from the edge of the flame retardant fire insulation layer 2, and the heights of the two ground cameras 531 from the ground are 3m and 8m respectively, which are used to observe the combustion conditions of the simulated oil pit 11 and the overall combustion conditions.

[0090] like Figure 6 As shown, it also includes a high-definition video camera 532 arranged in the simulated oil pit 11, and a miniature camera 533 arranged in the passage from the simulated oil pit 11 to the external accident oil collection tank.

[0091] like Figure 1 , 6As shown, the high-definition video cameras 532 in the simulated oil pit 11 are specifically distributed as follows: the first high-definition video camera 532 is set on the left side of the simulated oil pit 11 below the flame retardant fire insulation layer 2 (observing the fire point in the right direction), the second high-definition video camera 532 is set on the right side of the simulated oil pit 11 (observing the position of the oil discharge port of the simulated oil pit 11 below), the third high-definition video camera 532 is set on the left front direction of the simulated oil pit 11 (observing the fire point in the right rear direction), the fourth high-definition video camera 532 is set on the front side of the simulated oil pit 11 (observing the fire point in the rear direction), and the fifth high-definition video camera 532 is set on the right rear direction of the simulated oil pit 11 (observing the fire point in the left front direction) to shoot the flame burning situation at the bottom of the flame retardant fire insulation layer 2 during the test.

[0092] like Figure 6 As shown, the micro camera 533 is arranged in the oil drain pipe 112 and is 5 meters away from the oil drain port of the oil drain pipe 112 (i.e., the oil drain port of the simulated oil pit 11). The micro camera 533 photographs the drainage situation in the pipe during the test. In this embodiment, all cameras are high temperature resistant cameras.

[0093] It also includes a multi-channel video data acquisition system connected to the ground camera 531, the high-definition video camera 532, and the micro camera 533. The multi-channel video data acquisition system is an existing technology, which can record the images captured by the ground camera 531, the high-definition video camera 532, and the micro camera 533.

[0094] like Figure 1 As shown, the flow acquisition system 54 includes a flow indicator probe 541 disposed in the passage from the simulated oil pillow cavity 31 to the open oil pool 12 and in the passage from the simulated oil pit 11 to the external accident oil collection pool; specifically, the flow indicator probe 541 in the oil discharge pipeline 112 is disposed 0.2 m away from the oil discharge port of the oil discharge pipeline 112. The flow indicator probe 541 detects the flow and transmits the signal to the external control system, and the opening of the flow control valve 542 is controlled by the external control system, thereby realizing flow control.

[0095] It also includes a flow data acquisition system connected to the flow indicator probe 541 . The flow data acquisition system is a prior art and can acquire the flow size detected by the flow indicator probe 541 .

[0096] Working principle:

[0097] like Figure 1As shown, in the actual application of the converter transformer oil pit fire test platform of the present invention, the oil pillow heating device 32 preheats the transformer oil in the simulated oil pillow cavity 31 to facilitate subsequent combustion, and the preheated transformer oil is injected into the open oil pool 12, and the ignition system 51 ignites the transformer oil in the open oil pool 12. The transformer oil is continuously injected into the open oil pool 12, and the burning transformer oil overflows from the open oil pool 12, thereby simulating an overflow fire source. The flame retardant fire insulation layer 2 is used to prevent combustion and prevent the flowing fire from entering the simulated oil pit 11. The transformer oil flowing into the simulated oil pit 11 is passed to During the test, according to the fire situation, the fixed water sprinkler fire extinguishing system 41 and the mobile water fire truck 42 can be used to extinguish the fire. The temperature acquisition system 52 acquires the temperature of the simulated overflow fire source 1 and the temperature of the simulated oil pillow 3. The image acquisition system 53 acquires the internal image of the simulated oil pit 11 and the image of the simulated overflow fire source 1. The flow acquisition system 54 acquires the flow from the simulated oil pillow cavity 31 to the open oil pool 12 and the flow from the simulated oil pit 11 to the external accident oil collection pool, thereby simulating the high-temperature hot oil flowing to the oil pit surface after the transformer bushing bursts, the oil pit surface fire, and the oil The three scenarios of pit bottom fire can truly reproduce the development and evolution process of high-temperature hot oil fire in converter transformer fire. In terms of flame retardant and fireproofing test and fire protection of converter transformer oil pit, the test platform can realize the fire barrier effect test of different flame retardant and fireproofing materials and different flame retardant layer thicknesses in the oil pit under the converter transformer fire scenario, as well as the penetration performance test of different flame retardant materials, so as to provide a basis for the selection and design of oil pit flame retardant layer materials; in terms of the risk assessment of oil pit fire spread of converter transformer, the test platform can realize the study of the impact of fire extinguishing process on fire spread, as well as the effect of fire extinguishing process on oil The risk research of water mixture overflowing into oil pit can also provide a basis for optimizing the design of sprinkler heads for protecting fixed fire extinguishing systems. Therefore, this test platform is a test platform specially used to carry out comprehensive and systematic reconstruction of the occurrence, development and spread of oil pit fires caused by overflow fires in converter transformers. At the same time, it can realize the fire insulation effect test of flame retardant insulation layer, the penetration performance test of different flame retardant materials, the risk test of oil-water mixture spreading or overflowing into oil pits during fire fighting, the performance test and evaluation of fixed fire extinguishing systems, etc. It can truly reproduce the development process of high-temperature hot oil fire in converter transformer fire, and ensure the repeatability of the test.

[0098] Embodiment 2:

[0099] The present invention also discloses a test method using the above converter transformer oil pit fire isolation test platform, comprising the following steps:

[0100] First, the site is arranged according to the structure in Example 1. In this embodiment, the flame retardant and fireproofing layer 2 is set to 250mm. When the internal flame retardant and fireproofing material 22 is pebbles, the particle size range is 50-80mm, or new ceramic foam glass particles are used, and the particle size range is 25-60mm. This embodiment uses pebbles with a particle size of 50mm.

[0101] The high-definition video camera 532 is debugged to ensure normal operation. In addition, the infrared camera 521 and the ground camera 531 are aimed at the direction to be photographed, and all images are output to an external display at the same time.

[0102] Then proceed as follows:

[0103] s1. Simulate oil conservator oil filling preheating:

[0104] Close the passage from the simulated oil pillow cavity 31 to the open oil pool 12. Specifically, manually close the flow control valve 542, inject transformer oil into the simulated oil pillow cavity 31, fill the simulated oil pillow cavity 31, the weight of the transformer oil in the simulated oil pillow cavity 31 of this embodiment is 8 tons, and use the oil pillow heating device 32 to preheat the transformer oil. The preheating temperature is determined according to the actual test requirements and the type of transformer oil.

[0105] s2. Open oil pool filling:

[0106] The preheated transformer oil in the simulated oil pillow cavity 31 is injected into the open oil pool 12, and the ignition start time when simulating different numbers of bushing bursting and overflowing meets the requirements of Table 1;

[0107] Table 1 Ignition timing requirements for simulating different numbers of casing burst overflow

[0108]

[0109] s3, open oil pool ignition:

[0110] According to the number of simulated bushings, when the requirements of Table 1 are met, the transformer oil in the open oil pool 12 is ignited by the ignition system 51, and transformer oil is continuously injected into the open oil pool 12. When the flame continues to burn autonomously for not less than 20 seconds, the ignition system 51 is remotely controlled to be turned off;

[0111] s4. Traffic records:

[0112] Start timing from the time when the ignition system 51 is turned off, and record the flow rate of the channel from the simulated oil pillow cavity 31 to the open oil pool 12, that is, the remote display reading of the flow indicator probe 541 in the oil pipeline 33, every t, and t shall not exceed 15s. At the same time, observe and record the changes in the fire intensity of the upper and lower parts of the flame retardant fire insulation layer 2 during the process of the open oil pool 12 overflowing and flowing into the simulated oil pit 11. If the bottom of the simulated oil pit 11 is on fire, observe whether there is fire entering the oil discharge pipeline 112 from the simulated oil pit 11 to the external accident oil collection pool;

[0113] s5. Fire extinguishing with flame retardant fire barrier:

[0114] If the bottom of the simulated oil pit 11 is on fire, the fixed water sprinkler fire extinguishing system 41 is turned on to cool down the fire point on the flame retardant fire insulation layer 2, and the fire situation on the upper part of the flame retardant fire insulation layer 2 of the simulated oil pit 11 is observed through the ground camera 531 in the image acquisition system 53, and the fire situation on the lower part of the simulated oil pit 11 is observed through the high-definition video camera 532;

[0115] s6. Open oil pool fire extinguishing:

[0116] When it is confirmed that the bottom of the flame retardant fireproof layer 2 is on fire (from the end of ignition to the time when the bottom of the flame retardant fireproof layer 2 is on fire, that is, the failure time of the flame retardant fireproof layer 2), start the mobile water fire truck 42 to extinguish the open oil pool 12, the water flow rate is 10-20L / s, lasting 10-20min, and spraying 6000-24000L of water. The infrared camera 521 in the temperature acquisition system 52 records the temperature of the open oil pool 12 and the fire situation. The ground camera 531 in the image acquisition system 53 records the fire extinguishing process, the change of the fire situation, and whether there is an oil-water mixture overflowing to the ground around the open oil pool 12. The high-definition video camera 532 and the micro camera 533 observe whether the lower drainage of the simulated oil pit 11 is unobstructed, and the flow rate from the simulated oil pit 11 to the external accident oil collection pool, that is, the penetration rate of the flame retardant fireproof layer 2;

[0117] s7. Close the test platform:

[0118] After the open flames in the open oil pool 12 and the upper and lower parts of the flame-retardant fire-insulating layer 2 are completely extinguished, close the passage from the simulated oil pillow cavity 31 to the open oil pool 12, that is, close the flow control valve 542, and the fixed water sprinkler fire extinguishing system 41 and the mobile water fire truck 42 continue to spray until the oil temperature in the open oil pool 12 drops below 100° C., and then continue to spray for 30 seconds before ending the spraying. The test is over, and the supporting measurement and control system 5 is turned off, and the data, photos, and videos are saved. After the transformer oil cools to room temperature, clean the open oil pool 12 and the simulated oil pit 11;

[0119] s8. Replace the flame retardant and fire insulation layer 2 with different thicknesses and different flame retardant and fire insulation materials, and repeat steps s1-s7 to implement the fire insulation test of the flame retardant and fire insulation layer 2 with different thicknesses and different flame retardant and fire insulation materials.

[0120] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A converter transformer oil pit fire test platform, characterized by: The invention comprises a simulated overflow fire source (1), a flame retardant fireproofing layer (2), a simulated oil pillow (3), a matching fire extinguishing system (4), and a matching measurement and control system (5); the simulated overflow fire source (1) comprises a simulated oil pit (11), an open oil pool (12) arranged above the simulated oil pit (11), the simulated oil pit (11) leads to an external accident oil collecting pool, the flame retardant fireproofing layer (2) covers the simulated oil pit (11), and the flame retardant fireproofing layer (2) is located below the open oil pool (12); the open oil pool (12) is a rectangular parallelepiped with an open top, and the open oil pool (12) is At least two simulated oil overflow grooves (121) are provided on the long side walls on both sides, the horizontal spacing between two adjacent simulated oil overflow grooves (121) is equal, along the length direction of the open oil pool (12), the position of the simulated oil overflow grooves (121) gradually rises, and the vertical spacing between two adjacent simulated oil overflow grooves (121) is equal; the flame retardant and fireproofing layer (2) comprises a steel fixed net (21) and a flame retardant and fireproofing material (22) placed in the steel fixed net (21), and the thickness of the flame retardant and fireproofing layer (2) is changed by presetting the steel fixed net (21) with different packaging thicknesses; The simulated oil pillow (3) comprises a simulated oil pillow cavity (31) and an oil pillow heating device (32) arranged in the simulated oil pillow cavity (31), and the simulated oil pillow cavity (31) leads to an open oil pool (12); The matching measurement and control system (5) comprises an ignition system (51) capable of igniting the open oil pool (12), a temperature acquisition system (52) capable of acquiring the temperature of the simulated overflow fire source (1) and the temperature of the simulated oil pillow (3), an image acquisition system (53) capable of acquiring an image of the interior of the simulated oil pit (11) and an image of the simulated overflow fire source (1), and a flow acquisition system (54) capable of acquiring a flow rate from the simulated oil pillow cavity (31) to the open oil pool (12) and a flow rate from the simulated oil pit (11) to an external accident oil collection pool.

2. The converter transformer oil pit fire test platform according to claim 1 is characterized by: The open oil pool (12) is a rectangular parallelepiped with an open top, and the projection of the open oil pool (12) in the vertical direction is located within the range of the simulated oil pit (11).

3. The converter transformer oil pit fire test platform according to claim 1 is characterized by: A support frame (111) is arranged in the simulated oil pit (11), the steel fixed net (21) is placed on the support frame (111), and the steel fixed net (21) covers the simulated oil pit (11).

4. The converter transformer oil pit fire test platform according to claim 1 is characterized by: The supporting fire extinguishing system (4) comprises a fixed water sprinkler fire extinguishing system (41) and a mobile water fire fighting truck (42); the fixed water sprinkler fire extinguishing system (41) can spray toward the flame retardant fire insulation layer (2), and the mobile water fire fighting truck (42) can spray toward the open oil pool (12).

5. The converter transformer oil pit fire test platform according to claim 4 is characterized in that: The fixed water sprinkler fire extinguishing system (41) comprises two rows of nozzles (411) symmetrically arranged on both sides of the flame retardant fire insulation layer (2), the nozzles (411) are all horizontally facing the flame retardant fire insulation layer (2), each row of nozzles (411) is 0.3-0.5m away from the edge of the flame retardant fire insulation layer (2), in each row of nozzles (411), the distance between two adjacent nozzles (411) is 0.6-1.5m, and the nozzles (411) are 0.5-1.0m away from the ground; The mobile water fire fighting truck (42) is 5-10m away from the flame retardant fire insulation layer (2) and has a water carrying capacity of 6-10t.

6. The converter transformer oil pit fire test platform according to claim 1 is characterized by: The temperature acquisition system (52) comprises an infrared camera (521) placed 4-8 m away from the edge of the flame retardant fire insulation layer (2), and the infrared camera (521) is 2.5-3.5 m away from the ground; Also included are thermocouples (522) installed in the open oil pool (12) and the simulated oil pillow (3); It also includes a temperature data acquisition system connected to the infrared camera (521) and the thermocouple (522).

7. The converter transformer oil pit fire test platform according to claim 1 is characterized by: The image acquisition system (53) comprises two ground cameras (531) placed on both sides of the flame retardant fire insulation layer (2); It also includes a high-definition video camera (532) arranged in the simulated oil pit (11), and a miniature camera (533) arranged in a passage from the simulated oil pit (11) to an external accident oil collection tank; It also includes a multi-channel video data acquisition system connected to a ground camera (531), a high-definition video camera (532), and a miniature camera (533).

8. The converter transformer oil pit fire test platform according to claim 1 is characterized by: The flow acquisition system (54) comprises a flow indicator probe (541) arranged in a passage from the simulated oil pillow cavity (31) to the open oil pool (12) and in a passage from the simulated oil pit (11) to an external accident oil collection pool; and also comprises a flow data acquisition system connected to the flow indicator probe (541).

9. A test method using the converter transformer oil pit fire test platform according to any one of claims 1 to 8, characterized in that: The steps include: s1. Simulate oil conservator oil filling preheating: Closing the passage from the simulated oil pillow cavity (31) to the open oil pool (12), injecting transformer oil into the simulated oil pillow cavity (31), and preheating the transformer oil using the oil pillow heating device (32); s2. Open oil pool filling: Injecting the preheated transformer oil in the simulated oil pillow cavity (31) into the open oil pool (12); s3, open oil pool ignition: The transformer oil in the open oil pool (12) is ignited by using the ignition system (51), while transformer oil is continuously injected into the open oil pool (12), and when the flame continues to burn autonomously for not less than 20 seconds, the ignition system (51) is turned off; s4. Traffic records: Starting from the time when the ignition system (51) is turned off, the flow rate of the passage from the simulated oil pillow cavity (31) to the open oil pool (12) is recorded every t, and t does not exceed 15s. At the same time, the changes in the fire intensity of the upper and lower parts of the flame retardant fire insulation layer (2) during the process of the open oil pool (12) overflowing and flowing into the simulated oil pit (11) are observed and recorded. If the bottom of the simulated oil pit (11) is on fire, observe whether there is fire entering the passage from the simulated oil pit (11) to the external accident oil collection pool; s5. Fire extinguishing with flame retardant fire barrier: If the bottom of the simulated oil pit (11) is on fire, the matching fire extinguishing system (4) is turned on to cool down the fire point above the flame retardant and fireproofing layer (2), and the fire situation above the flame retardant and fireproofing layer (2) of the simulated oil pit (11) and the fire situation below the simulated oil pit (11) are observed through the image acquisition system (53); s6. Open oil pool fire extinguishing: When it is confirmed that the bottom of the flame retardant fireproof layer (2) is on fire, the supporting fire extinguishing system (4) is started to extinguish the open oil pool (12), the temperature acquisition system (52) records the temperature of the open oil pool (12), and the image acquisition system (53) records the fire extinguishing process, the change of the fire intensity, whether there is an oil-water mixture overflowing to the ground around the open oil pool (12), and observes whether the lower part of the simulated oil pit (11) is unobstructed, and the flow rate from the simulated oil pit (11) to the external accident oil collection pool, that is, the penetration rate of the flame retardant fireproof layer (2); s7. Close the test platform: After the open flames in the open oil pool (12) and the upper and lower parts of the flame retardant fire insulation layer (2) are completely extinguished, the passage from the simulated oil pillow cavity (31) to the open oil pool (12) is closed, and the supporting fire extinguishing system (4) continues to spray until the oil temperature in the open oil pool (12) drops below 100° C., and then continues to spray for 10-30 seconds before the spraying ends. The test is ended, and the supporting measurement and control system (5) is closed, and the data, photos, and videos are saved; s8. Replace the flame retardant and fire insulation layer (2) with different thicknesses and different flame retardant and fire insulation materials, and repeat steps s1-s7 to implement the fire insulation test of the flame retardant and fire insulation layer (2) with different thicknesses and different flame retardant and fire insulation materials.

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