Transformer oil burning explosion experiment system and method for simulating variable environment temperature

Abstract

The invention discloses a transformer oil burning and explosion experiment system and method for simulating variable environment temperature, and belongs to the technical field of transformer oil burning and explosion experiments. Comprising an ignition device, an explosion cabin, a heating cabin and a temperature-pressure composite sensor, and the ignition device is used for simulating a variable environment temperature; the explosion cabin is used for simulating a transformer oil explosion area, and a heat insulation material is placed in the heating cabin and used for reflecting the influence of the variable environment temperature and the transformer oil explosion process on the heat insulation material; the temperature and pressure composite sensor is used for collecting temperature distribution and pressure distribution of the heat insulation material in the heating cabin in the transformer oil burning and explosion experiment process. The device can simulate the burning and explosion behaviors of the transformer oil under different temperature conditions, and solves the problem that the applicability and comprehensiveness of the experimental result are limited because the existing experimental device cannot simulate the burning and explosion behaviors of the transformer oil under normal temperature and high temperature environments at the same time.

Description

Technical Field

[0001] The invention relates to the technical field of transformer oil explosion experiments, and in particular to a transformer oil explosion experiment system and method for simulating variable ambient temperature. Background Art

[0002] The statements in this section merely mention background art related to the present invention and do not necessarily constitute prior art.

[0003] With the continuous development of power systems and the widespread application of transformers in power transmission and distribution, the safety and reliability of transformers have become one of the focuses of the power industry. Transformer oil, as an important insulating and cooling medium in the transformer, plays a key role in the normal operation of the transformer. However, in some extreme cases, such as electrical failures or external fire sources, transformer oil may burn or even explode, resulting in serious equipment damage and casualties. Therefore, studying and simulating the combustion and explosion behavior of transformer oil under normal and high temperature environments, and then obtaining its combustion and explosion characteristic parameters, is of great significance for improving the safety design and protection measures of transformers.

[0004] At present, the research on the explosion characteristics of transformer oil mainly relies on on-site accident analysis and limited laboratory tests. However, traditional experimental systems often find it difficult to truly simulate the explosion process of transformer oil under complex conditions, especially the explosion characteristics under high temperature environments. Existing experimental systems usually have the following problems:

[0005] 1. The experimental conditions of the existing experimental system have limitations and cannot simulate the explosion behavior of transformer oil under normal and high temperature environments at the same time, which limits the applicability and comprehensiveness of the experimental results.

[0006] 2. Traditional sensors lack measurement accuracy and stability in high temperature and high pressure environments, making it difficult to obtain accurate combustion and explosion parameters.

[0007] 3. Transformer oil explosion experiments involve high temperature, high pressure and flammable substances. Safety during the experiment is an important issue, but the safety protection measures of existing systems are usually not perfect. Summary of the invention

[0008] In order to solve the deficiencies of the prior art, the present invention provides a transformer oil explosion experiment system and method for simulating variable ambient temperature, so as to simulate the explosion behavior of transformer oil under different temperature conditions.

[0009] In a first aspect, the present invention provides a transformer oil explosion test system simulating variable ambient temperature;

[0010] A transformer oil explosion test system simulating variable ambient temperature, comprising:

[0011] an ignition device, the ignition device being used to simulate a variable ambient temperature;

[0012] An explosion chamber, wherein the explosion chamber is used to simulate a transformer oil explosion area;

[0013] A heating chamber, wherein a heat-insulating material is placed in the heating chamber to reflect the influence of the variable ambient temperature and the explosion process of the transformer oil on the heat-insulating material;

[0014] A temperature-pressure composite sensor is used to collect the temperature distribution and pressure distribution of the insulation material in the heating chamber during the transformer oil explosion experiment.

[0015] In some embodiments, the ignition device includes an electric heating plate and an electronic igniter, wherein the electric heating plate is used to adjust the ambient temperature of the heating chamber, and the electronic igniter is used to ignite the transformer oil placed in the explosion chamber.

[0016] In some embodiments, the temperature-pressure composite sensor is slidably connected to the heating chamber.

[0017] In some embodiments, a double-layer guide rail structure is further included, and the double-layer guide rail structure is arranged inside the heating chamber, and the temperature-pressure composite sensor is slidably connected to the double-layer guide rail structure.

[0018] In some embodiments, the double-layer guide rail structure includes a longitudinal guide rail and a plurality of transverse guide rails, wherein the transverse guide rails are respectively arranged on two side walls of the heating chamber along the height direction, and two end portions of the transverse guide rails are respectively slidably connected to the transverse guide rails.

[0019] In some embodiments, the temperature and pressure composite sensor includes a sensor probe, an optical fiber and an optical fiber protection structure, the optical fiber protection structure is sleeved on the optical fiber, and the sensor probe is sleeved on the optical fiber protection structure; a composite pressure diaphragm is provided at the bottom end of the optical fiber protection structure.

[0020] In some embodiments, the optical fiber protection structure includes a protective steel belt and a metal inner tube, the metal inner tube is sleeved on the optical fiber, there is a vacuum cavity between the bottom end of the metal inner tube and the optical fiber, and the protective steel belt is arranged between the metal inner tube and the optical fiber.

[0021] In some embodiments, one end of the explosion chamber is in communication with the heating chamber.

[0022] In some embodiments, a film is provided at the connection between the explosion chamber and the heating chamber.

[0023] In some embodiments, the heating chamber is provided with a first observation window and a first pressure relief port, and the first pressure relief port is provided with a safety valve.

[0024] In some embodiments, the explosion chamber is provided with a second observation window and a second pressure relief port, and the second pressure relief port is provided with a safety valve;

[0025] An oil pan and a heating plate are arranged in the explosion chamber, wherein the oil pan is used for placing transformer oil, and the heating plate is used for heating the transformer oil.

[0026] In a second aspect, the present invention provides a transformer oil explosion test method simulating a variable ambient temperature;

[0027] A transformer oil explosion test method simulating variable ambient temperature, based on the transformer oil explosion test system simulating variable ambient temperature, comprises:

[0028] Combine the heating chamber with the explosion chamber and add transformer oil into the explosion chamber;

[0029] The ignition device is used to simulate the explosion conditions of transformer oil under variable ambient temperature and ignite the transformer oil;

[0030] During the explosion of transformer oil, the shock generated by the transformer oil explosion enters the heating chamber. The temperature distribution and pressure distribution of the insulation material in the heating chamber are collected by a temperature-pressure composite sensor to analyze the influence of the shock wave on the mechanical properties of the insulation material under different high temperatures.

[0031] In some embodiments, the ignition device simulates the explosion conditions of transformer oil under variable ambient temperature, and ignites the transformer oil specifically by controlling the heating plate to heat the transformer oil, generating transformer oil vapor and mixing it with air to form explosive gas, and igniting the explosive gas by an electronic igniter.

[0032] In some embodiments, the ignition device simulates the explosion conditions of transformer oil under variable ambient temperature, and ignites the transformer oil specifically by heating the heating chamber through an electric heating plate, and when the transformer oil vapor generated by the heating of the transformer oil is fully mixed with the air in the explosion chamber, the transformer oil is ignited by an electronic igniter.

[0033] In some embodiments, during the explosion of transformer oil, the combustion process is observed in real time through the first observation window and the second observation window.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. The technical solution provided by the present invention can simulate the combustion and explosion behavior of transformer oil at room temperature and high temperature respectively by setting up a combination of a heating chamber and an explosion chamber; the temperature can be precisely controlled by the heating element set in the heating chamber to create a high-temperature environment; at the same time, the explosion chamber can be kept at room temperature or reach a set high temperature through heat conduction. This flexible chamber design allows the experimental device to meet the needs of different experimental conditions, breaking through the limitation that traditional devices can only conduct experiments under a single temperature condition, and providing a richer experimental scenario.

[0036] 2. The technical solution provided by the present invention introduces a high-temperature optical fiber temperature-pressure composite sensor, which can not only measure temperature and pressure simultaneously, but also maintain high accuracy and stability under high temperature and high pressure environments. Compared with the traditional sensors used in the prior art, the sensor of the present invention has stronger high temperature resistance, and the measurement position can be flexibly adjusted through the guide rail system to achieve multi-point measurement, which greatly improves the accuracy and applicability of experimental data.

[0037] 3. The technical solution provided by the present invention is that the ignition device has an intelligent control function, and the electric heating plate and the electronic igniter can be operated independently or in conjunction to accurately control the ignition conditions. Compared with the traditional device that relies on manual operation, the present invention provides a higher level of automation and reduces human errors.

[0038] 4. The technical solution provided by the present invention adjusts the temperature of the heating chamber through an electric heating plate, and uses a high-temperature optical fiber temperature-pressure composite sensor to monitor the temperature and pressure changes of the insulation material in real time, so that researchers can observe the combustion and explosion characteristics of transformer oil under different temperature conditions in the same experiment, thereby providing more comprehensive experimental data.

[0039] 5. The technical solution provided by the present invention adopts a high-temperature optical fiber temperature-pressure composite sensor, which can monitor the changes in temperature and pressure during the experiment in real time and obtain more accurate combustion and explosion parameters; while directly igniting the transformer oil may cause data errors due to factors such as equipment limitations and the suddenness of simulated temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0041] Figure 1 A schematic diagram of the structure of a variable ambient temperature transformer oil explosion simulation experimental system provided by an embodiment of the present invention;

[0042] Figure 2 A schematic diagram of the structure of a heating chamber provided in an embodiment of the present invention;

[0043] Figure 3 A schematic diagram of the structure of an explosion chamber provided by an embodiment of the present invention;

[0044] Figure 4 A schematic diagram of the structure of a temperature-pressure composite sensor provided in an embodiment of the present invention;

[0045] In the figure:

[0046] 1. Heating chamber; 11. First observation window; 12. First pressure relief port; 13. Electric heating plate; 2. Explosion chamber; 21. Second observation window; 22. Second pressure relief port; 23. Oil container; 24. Heating plate; 25. Film; 26. Electronic igniter; 3. Longitudinal guide rail; 31. Composite elastic pressure diaphragm; 32. Slider; 33. Sensor probe; 34. Optical fiber flange; 35. Metal inner tube; 36. Filling welding material; 37. Metallized layer; 38. Protective steel belt; 39. Optical fiber; 310. Vacuum cavity; 311. Thermal insulation material. DETAILED DESCRIPTION

[0047] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0048] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0049] Embodiment 1

[0050] Most of the transformer oil explosion test devices in the prior art are only used to directly ignite the transformer oil and observe the combustion process of the transformer oil, without considering the explosion process of the transformer oil under complex conditions and the gradual impact of the transformer oil on other components after the explosion.

[0051] Therefore, the present invention provides a transformer oil explosion experiment system that simulates variable ambient temperature. With the cooperation of components such as the heating chamber 1, the explosion chamber 2 and the temperature-pressure composite sensor, a simulation experiment of transformer oil explosion at a variable temperature is realized, reflecting the influence of the ambient temperature and the transformer oil explosion process on the insulation material 311.

[0052] Next, combine Figure 1-Figure 4, a transformer oil explosion test system simulating variable ambient temperature disclosed in this embodiment is described in detail. The transformer oil explosion test system simulating variable ambient temperature includes an ignition device, an explosion chamber 2, a heating chamber 1 and a temperature-pressure composite sensor. The heating chamber 1 is provided with a heat-insulating material 311, and the heat-insulating material 311 is used to simulate the material wrapping the valve core in the transformer; the ignition device is used to simulate the different ambient temperature conditions of the heat-insulating material 311, the explosion chamber 2 is used to simulate the transformer oil explosion area, the heating chamber 1 is used to reflect the influence of the variable ambient temperature and the transformer oil explosion process on the heat-insulating material 311, and the temperature-pressure composite sensor is used to collect the temperature distribution and pressure distribution of the heat-insulating material 311 in the heating chamber 1 during the transformer oil explosion experiment.

[0053] Furthermore, the heating chamber 1 and the explosion chamber 2 are both detachable rectangular parallelepiped structures composed of high temperature resistant plates. The heating chamber 1 is provided with a first observation window 11 and a first pressure relief port 12, and the explosion chamber 2 is provided with a second observation window 21 and a second pressure relief port 22. A heating plate is placed in the explosion chamber 2, and an oil pan 23 is placed on the heating plate. Transformer oil is placed in the oil pan 23. The heating plate is used to heat the transformer oil, thereby controlling the heating rate of the transformer oil to simulate different working conditions. The first pressure relief port 12 and the second pressure relief port 22 are respectively installed with safety valves, which are used to automatically release pressure when the pressure in the chamber exceeds a set threshold. One end of the explosion chamber 2 is connected to the heating chamber 1, and a film 25 is pasted at the connection between the explosion chamber 2 and the heating chamber 1, and the outer wall of the film 25 is sealed and bonded to the outer wall of the explosion chamber 2.

[0054] The ignition device includes an electric heating plate 13 and an electronic igniter 26. The electric heating plate 13 is installed inside the heating chamber 1. The temperature inside the heating chamber 1 is adjusted by the electric heating plate 13 to simulate the experimental environment at different temperatures. The electronic igniter 26 is used to ignite transformer oil vapor and can be used in a movable manner.

[0055] The temperature and pressure composite sensor is slidably connected to the heating chamber 1 through a double-layer guide rail structure. Specifically, the double-layer guide rail structure is installed inside the heating chamber 1. The double-layer guide rail structure includes a longitudinal guide rail 3 and two transverse guide rails. The transverse guide rails are respectively fixed to the two side walls of the heating chamber 1 along the height direction, namely the upper wall and the lower wall of the chamber; the longitudinal guide rail 3 is vertically installed between the two transverse guide rails, and its two ends are respectively slidably connected to the transverse guide rails to move along the length direction of the heating chamber 1; when moved to the desired position, the guide rail bolt passes through the transverse guide rail and is threadedly connected to the longitudinal guide rail 3 to achieve limiting; the temperature and pressure composite sensor is installed on the longitudinal guide rail 3 through a slider 32, and is slidably connected to the longitudinal guide rail 3 to move along the height direction of the heating chamber 1; wherein the slider 32 is slidably connected to the longitudinal guide rail 3, one end of the temperature and pressure composite sensor is fixed to the slider 32, and the other end of the temperature and pressure composite sensor is placed inside the thermal insulation material 311; when moved to the desired position, the sensor bolt passes through the longitudinal guide rail 3 and is threadedly connected to the slider 32.

[0056] Here, the transverse guide rail and the longitudinal guide rail 3 are both half-mouth guide rails.

[0057] In this embodiment, considering that the high temperature and high pressure environment during the experiment will affect the measurement accuracy of the sensor, a high temperature resistant optical fiber 39-type temperature and pressure composite sensor is introduced.

[0058] As an implementation mode, the temperature and pressure composite sensor includes a sensor connector, a metallized layer 37, a filling welding material 36, an optical fiber protection structure and an optical fiber 39, the bottom end of the optical fiber protection structure is connected to a composite pressure diaphragm; the sensor connector includes a sensor probe 33, a metal inner tube 35 is sleeved on the optical fiber 39, a vacuum cavity 310 is between the bottom end of the metal inner tube 35 and the bottom end of the optical fiber 39, the filling welding material 36 is located at the top end of the optical fiber 39, and the metallized layer 37 is located at the top end of the filling welding material 36; a protective steel belt 38 is spirally wound between the metal inner tube 35 and the optical fiber 39, the sensor probe 33 is sleeved on the metal inner tube 35, and the two are connected by an optical fiber flange 34.

[0059] In this embodiment, the temperature-pressure composite sensor can simultaneously realize the composite measurement of temperature and pressure, and utilizes the composite elastic pressure diaphragm 31 equipped on the top of the sensor probe 33 to sensitively respond to external pressure changes to ensure the accuracy of pressure measurement; the temperature is measured through the optical fiber 39, and the optical fiber protection structure is utilized to form a vacuum cavity 310 in the metal inner tube 35 to ensure the stability of the optical fiber 39 in extreme environments. At the same time, the protective steel belt 38 enhances the mechanical strength and durability of the sensor, making it resistant to high temperature and interference, and suitable for complex experimental environments of high temperature and high pressure.

[0060] In the composite measurement, the pressure is accurately measured by the deformation of the composite elastic pressure diaphragm 31, while the temperature is monitored in real time by the change of the refractive index of the optical fiber 39, avoiding the influence of electromagnetic interference on the measurement. This design can not only realize the dual measurement of temperature and pressure in a single sensor, simplifying the operation of the equipment, but also improving the accuracy and efficiency of the system.

[0061] In this embodiment, the first observation window 11 and the second observation window 21 are both made of high-temperature resistant explosion-proof glass, and the insulation material 311 is aerogel; all surfaces of the cabin are detachable and can be extended as needed, for example, by means of snap-on, bolted connection, etc. to achieve detachable connection.

[0062] In this embodiment, the electronic igniter 26 is a KTGD-B type adjustable electronic igniter 26 .

[0063] Based on the transformer oil explosion experiment system simulating variable ambient temperature described in this embodiment, the specific process of transformer oil explosion simulation at room temperature is as follows:

[0064] (1) Prepare the experimental equipment and determine the experimental parameters

[0065] Place the insulation material 311 to be tested in the heating chamber 1, and use the heating chamber 1 in combination with the explosion chamber 2, and seal the connection between the two chambers with a film 25. Determine the required transformer oil capacity, place an oil pan 23 in the explosion chamber 2, add transformer oil, and turn off the heating plate 24 to ensure that the oil remains at room temperature. Check the sealing of the observation window and the pressure relief port, and confirm that the pressure relief port is in automatic mode.

[0066] (2) Ignition device configuration

[0067] The electronic igniter 26 is placed in the explosion chamber 2 and its position is adjusted to ensure that it can contact the gas in the explosion chamber 2 .

[0068] (3) Test experimental data

[0069] The initial measurement position of the temperature and pressure composite sensor is set and placed inside the measured insulation material 311. The heating plate 24 is controlled to heat the transformer oil to keep the wall temperature of the explosion chamber 2 high for a period of time. When the transformer oil evaporates and fully mixes with the air, explosive gas is formed, and the explosive gas is ignited by the electronic igniter 26.

[0070] Here, the experimenter observes through the observation window whether the color of the mixed air is stable and ensures that the mixing time is sufficient to ensure sufficient mixing of the transformer oil vapor and air.

[0071] The shock wave generated by the transformer oil explosion penetrates the film 25 and enters the heating chamber 1. The shock wave affects the insulation material 311 in the heating chamber 1. The temperature and pressure composite sensor starts to collect temperature and pressure data in the insulation material 311 and transmits the data to the experimental monitoring device in real time.

[0072] In real scenarios, when transformer oil burns or explodes, the explosion shock wave will directly act on the transformer casing and the surrounding environment, which may cause stress and damage to surrounding equipment or structures. Therefore, in this embodiment, by designing the film 25 between the explosion chamber 2 and the heating chamber 1, the film 25 is used as a partition layer between the explosion chamber 2 and the heating chamber 1 to carry and transmit the explosion shock, thereby reproducing the situation in which the shock wave propagates from the closed explosion source to the adjacent space in the simulation, and realizing the true restoration of the explosion scene.

[0073] (4) End of experiment and data recording

[0074] After completing a transformer oil explosion test, open the pressure relief port to release the pressure. Use fresh air to purge the test chamber to displace the combustion products.

[0075] After cleaning, remove the first observation window 11, change the position of the thermal insulation material 311, and change the position of the temperature-pressure composite sensor through the guide rail so that the temperature-pressure composite sensor is placed inside the thermal insulation material 311, and then install the first observation window 11. Repeat steps (1) to (3) to analyze the effect of transformer oil explosion at room temperature on the thermal insulation material 311 at different positions, thereby achieving the purpose of studying the transformer oil explosion mechanism at room temperature.

[0076] Based on the transformer oil explosion experimental system simulating variable ambient temperature described in this embodiment, the specific process of realizing transformer oil explosion simulation at high temperature is as follows:

[0077] (1) Prepare the experimental equipment and determine the experimental parameters

[0078] Place the insulation material 311 to be tested in the heating chamber 1, and use the heating chamber 1 in combination with the explosion chamber 2, and seal the connection between the two chambers with a film 25. Determine the required transformer oil capacity, place an oil pan 23 in the explosion chamber 2, add transformer oil, and turn off the heating plate 24 to ensure that the oil remains at room temperature. Check the sealing of the observation window and the pressure relief port, and confirm that the pressure relief port is in automatic mode.

[0079] (2) Ignition system configuration

[0080] The electric heating plate 13 and the electronic igniter 26 are placed in the heating chamber 1 and the explosion chamber 2 respectively. The electric heating plate 13 is used to heat the entire heating chamber 1, and the electronic igniter 26 is used to ignite the explosive gas formed by the mixture of transformer oil vapor and air.

[0081] (3) Test experimental data

[0082] The initial measurement position of the temperature and pressure composite sensor is set inside the measured insulation material 311. First, the heating system is started. The electric heating plate 13 heats the environment where the insulation material 311 is located to reach the set temperature value. The heating plate 24 heats the transformer oil to evaporate it. After the steam and air are fully mixed, the electronic igniter 26 ignites the mixed gas to form an explosion. The experimenter observes the combustion process in real time through the observation window. The temperature and pressure composite sensor collects the temperature and pressure data in the insulation material 311 under high temperature environment in real time and transmits it to the experimental monitoring device.

[0083] (4) End of experiment and data recording

[0084] After completing a transformer oil explosion test, open the pressure relief port to release the pressure. Use fresh air to purge the test chamber to displace the combustion products. After the cleaning is completed, prepare for further tests under different temperatures and conditions to verify the impact of different temperature environments on the explosion characteristics of transformer oil.

[0085] The position and ambient temperature of the thermal insulation material 311 are changed, and steps (1) to (3) are repeated to analyze the effect of transformer oil explosion shock under different temperature conditions on the properties of the thermal insulation material 311.

[0086] Specifically, the heat insulating material 311 is placed at different positions of the heating chamber 1, and the temperature and pressure sensor is moved by the guide rail and placed inside the heat insulating material 311 to monitor the temperature and pressure parameters of the transformer oil under the impact of explosion in real time. The temperature of the electric heating plate 24 is adjusted to create different temperature environments of the heat insulating material 311 and repeat the experiment.

[0087] Embodiment 2

[0088] Based on the transformer oil explosion test system simulating variable ambient temperature described in Example 1, this embodiment discloses a transformer oil explosion test method simulating variable ambient temperature, including the following steps:

[0089] S1. Combine the heating chamber 1 and the explosion chamber 2, and add transformer oil into the explosion chamber 2.

[0090] Specifically, the measured insulation material 311 is placed in the heating chamber 1, and the heating chamber 1 is used in combination with the explosion chamber 2, and the connection between the two chambers is sealed by the film 25. The required transformer oil capacity is determined, and the oil pan 23 is placed in the explosion chamber 2, and transformer oil is added, and the heating plate 24 is closed to ensure that the oil is kept at room temperature. Check the sealing of the observation window and the pressure relief port, and confirm that the safety valve of the pressure relief port is in automatic mode.

[0091] S2. The ignition device is used to simulate the explosion conditions of transformer oil under variable ambient temperature and ignite the explosive gas formed by the mixture of transformer oil vapor and air.

[0092] Specifically, the electronic igniter 26 is placed in the explosion chamber 2 and its position is adjusted to ensure that it can contact the gas in the explosion chamber 2 .

[0093] Under normal temperature conditions, the heating plate 24 is controlled to heat the transformer oil to keep the wall temperature of the explosion chamber 2 high for a period of time. When the transformer oil evaporates and mixes fully with the air, the electronic igniter 26 ignites the explosion.

[0094] Under high temperature conditions, the heating system is started, and the electric heating plate 13 heats the environment where the heat insulating material 311 is located to reach a set temperature value. The heating plate 24 heats the transformer oil to evaporate it, and after the steam is fully mixed with the air, the electronic igniter 26 ignites the steam to form an explosion.

[0095] S3. During the explosion of transformer oil, after the shock generated by the explosion of transformer oil enters the heating chamber 1, the temperature distribution and pressure distribution of the heat insulating material 311 in the heating chamber 1 are collected through the temperature-pressure composite sensor.

[0096] Specifically, during the explosion of transformer oil, the experimenter observes the combustion process in real time through the observation window. The impact generated by the explosion of transformer oil penetrates the film 25 and enters the heating chamber 1, and the temperature and pressure composite sensor begins to collect temperature and pressure data in the insulation material 311, and transmits the data to the experimental monitoring device in real time.

[0097] After completing a transformer oil explosion test, open the pressure relief port to release the pressure. Use fresh air to purge the test chamber to displace the combustion products.

[0098] After the cleaning is completed, the position of the heat insulating material 311 and the set temperature of the heating plate 24 are changed, and steps S1 to S3 are repeated to analyze the influence of the transformer oil explosion shock on the characteristic parameters of the heat insulating material 311.

[0099] Furthermore, in some embodiments, if it is desired to simulate the characteristic parameters of the thermal insulation material 311 under different temperature environments, a separate heating chamber 1 may be used to conduct experiments.

[0100] Specifically, when the experiment is conducted using a separate heating chamber 1, the characteristic parameters of the heat insulating material 311, namely, the temperature and pressure of the heat insulating material 311, are measured by regulating the temperature change in the heating chamber 1. An oil container 23 and a heating plate are separately placed in the heating chamber 1, and the heating plate heats up at a preset rate and transfers heat to the oil product, simulating the thermal decomposition reaction or thermal stability of transformer oil under different temperature environments.

[0101] Furthermore, in some embodiments, if the combustion and explosion behavior of transformer oil in a specific explosion environment is to be tested, a separate explosion chamber 2 may be used to conduct the experiment.

[0102] When the experiment is conducted using a separate explosion chamber 2, the oil product can be directly placed in the oil container 23 of the explosion chamber 2, and an electronic igniter 26 is used to simulate a fire source to cause the transformer oil to explode.

[0103] During the experiment, the parameters such as ignition position, ignition energy and oil quantity are controlled to test the combustion and explosion behavior of the oil in a specific explosion environment.

[0104] The transformer oil explosion test method for simulating variable ambient temperature described in this embodiment is further described in detail below in conjunction with specific examples. It should be pointed out that the specific embodiments are explanations of this embodiment rather than limitations.

[0105] Example 1

[0106] At room temperature, the specific process of the transformer oil explosion test method simulating variable ambient temperature is as follows:

[0107] (1) Prepare the experimental equipment and determine the experimental parameters

[0108] Place the heat-insulating material 311 in the heating chamber 1, combine the heating chamber 1 with the explosion chamber 2, and seal the connection between the two chambers with the film 25. Determine the required transformer oil capacity, place the oil pan 23 in the explosion chamber 2, add transformer oil, and turn off the heating plate 24 to ensure that the oil remains at room temperature. Check the sealing of the observation window and the pressure relief port, and confirm that the pressure relief port is in automatic mode.

[0109] (2) Ignition device configuration

[0110] The electronic igniter 26 is placed in the explosion chamber 2 and its position is adjusted to ensure that it can contact the gas in the explosion chamber 2.

[0111] (3) Test experimental data

[0112] The initial measurement position of the temperature and pressure composite sensor is set in the insulation material 311. The electric heating plate 13 heats the environment of the insulation material 311 to reach the set temperature value. The heating plate 24 heats the transformer oil to evaporate it. After the steam and air are fully mixed, the electronic igniter 26 ignites the mixed gas to form an explosion.

[0113] The impact generated by the transformer oil explosion penetrates the film 25 and enters the heating chamber 1. The temperature and pressure composite sensor starts to collect temperature and pressure data in the insulation material 311 and transmits the data to the experimental monitoring device in real time.

[0114] (4) End of experiment and data recording

[0115] After completing a transformer oil explosion test, open the pressure relief port to release the pressure. Use fresh air to purge the test chamber to displace the combustion products.

[0116] After cleaning, the position of the thermal insulation material 311 is changed, and the position of the temperature-pressure composite sensor is changed by the guide rail so that the temperature-pressure composite sensor is placed inside the thermal insulation material 311. Steps (1) to (3) are repeated to analyze the effect of transformer oil explosion on the thermal insulation material 311 at different positions, thereby achieving the purpose of studying the transformer oil explosion mechanism at room temperature.

[0117] Example 2

[0118] The specific process of the transformer oil explosion test method under high temperature and simulated variable ambient temperature is as follows:

[0119] (1) Prepare the experimental equipment and determine the experimental parameters

[0120] Place the insulation material 311 to be tested in the heating chamber 1, and use the heating chamber 1 in combination with the explosion chamber 2, and seal the connection between the two chambers with a film 25. Determine the required transformer oil capacity, place an oil pan 23 in the explosion chamber 2, add transformer oil, and turn off the heating plate 24 to ensure that the oil remains at room temperature. Check the sealing of the observation window and the pressure relief port, and confirm that the pressure relief port is in automatic mode.

[0121] (2) Ignition system configuration

[0122] The electric heating plate 13 and the electronic igniter 26 are placed in the heating chamber 1 and the explosion chamber 2 respectively. The electric heating plate 13 is used to heat the entire chamber, and the electronic igniter 26 is used to ignite the explosive gas formed by the mixture of transformer oil vapor and air. (3) Test data

[0123] The initial measurement position of the temperature and pressure composite sensor is set inside the measured insulation material 311. The electric heating plate 13 heats the environment of the insulation material 311 to reach the set temperature value. The heating plate 24 heats the transformer oil to evaporate it. After the steam and air are fully mixed, the electronic igniter 26 ignites the mixed gas to form an explosion. The experimenter observes the combustion process in real time through the observation window. The temperature and pressure composite sensor collects real-time data inside the insulation material 311 under high temperature environment and transmits it to the experimental monitoring device.

[0124] (4) End of experiment and data recording

[0125] After completing a transformer oil explosion test, open the pressure relief port to release the pressure. Use fresh air to purge the test chamber to displace the combustion products. After the cleaning is completed, prepare for further tests under different temperatures and conditions to verify the impact of different temperature environments on the explosion characteristics of transformer oil.

[0126] The position of the heat insulating material 311 and the ambient temperature are changed, and steps (1) to (3) are repeated to analyze the influence of transformer oil explosion shock under different temperature conditions on the characteristics of the heat insulating material 311. The description of each embodiment in the above embodiments has different emphases. For the parts not described in detail in one embodiment, reference can be made to the relevant descriptions of other embodiments.

[0127] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A transformer oil explosion test system simulating variable ambient temperature, characterized in that: include: an ignition device, the ignition device being used to simulate a variable ambient temperature; An explosion chamber, wherein the explosion chamber is used to simulate a transformer oil explosion area; A heating chamber, wherein a heat-insulating material is placed in the heating chamber to reflect the influence of the variable ambient temperature and the explosion process of the transformer oil on the heat-insulating material; A temperature-pressure composite sensor is used to collect the temperature distribution and pressure distribution of the insulation material in the heating chamber during the transformer oil explosion experiment.

2. The transformer oil explosion test system simulating variable ambient temperature according to claim 1, characterized in that: The ignition device comprises an electric heating plate and an electronic igniter, wherein the electric heating plate is used to adjust the ambient temperature of the heating chamber, and the electronic igniter is used to ignite the transformer oil placed in the explosion chamber.

3. The transformer oil explosion test system simulating variable ambient temperature according to claim 1, characterized in that: The temperature and pressure composite sensor is slidably connected to the heating chamber; Furthermore, it also includes a double-layer guide rail structure, which is arranged inside the heating chamber, and the temperature-pressure composite sensor is slidably connected to the double-layer guide rail structure; Furthermore, the double-layer guide rail structure includes a longitudinal guide rail and a plurality of transverse guide rails, wherein the transverse guide rails are respectively arranged on two side walls of the heating chamber along the height direction, and two end portions of the transverse guide rails are respectively slidably connected to the transverse guide rails.

4. The transformer oil explosion test system simulating variable ambient temperature according to claim 1, characterized in that: The temperature and pressure composite sensor comprises a sensor probe, an optical fiber and an optical fiber protection structure, wherein the optical fiber protection structure is sleeved on the optical fiber, the sensor probe is sleeved on the optical fiber protection structure, and a composite pressure diaphragm is provided at the bottom end of the optical fiber protection structure; Furthermore, the optical fiber protection structure includes a protective steel belt and a metal inner tube, the metal inner tube is sleeved on the optical fiber, and the protective steel belt is arranged between the metal inner tube and the optical fiber.

5. The transformer oil explosion test system simulating variable ambient temperature according to claim 1, characterized in that: One end of the explosion chamber is in communication with the heating chamber; Furthermore, a film is provided at the connection point between the explosion chamber and the heating chamber.

6. The transformer oil explosion test system simulating variable ambient temperature according to claim 1, characterized in that: The heating chamber is provided with a first observation window and a first pressure relief port, and the first pressure relief port is provided with a safety valve.

7. The transformer oil explosion test system simulating variable ambient temperature according to claim 1, characterized in that: The explosion chamber is provided with a second observation window and a second pressure relief port, and the second pressure relief port is provided with a safety valve; An oil pan and a heating plate are arranged in the explosion chamber, wherein the oil pan is used for placing transformer oil, and the heating plate is used for heating the transformer oil.

8. A transformer oil explosion test method simulating variable ambient temperature, based on the transformer oil explosion test system simulating variable ambient temperature according to any one of claims 1 to 7, characterized in that: include: Combine the heating chamber with the explosion chamber and add transformer oil into the explosion chamber; The ignition device is used to simulate the explosion conditions of transformer oil under variable ambient temperature and ignite the transformer oil; During the explosion of transformer oil, the shock generated by the transformer oil explosion enters the heating chamber. The temperature distribution and pressure distribution of the insulation material in the heating chamber are collected by a temperature-pressure composite sensor to analyze the influence of the shock wave on the mechanical properties of the insulation material under different high temperatures.

9. The transformer oil explosion test method simulating variable ambient temperature according to claim 8, characterized in that: The ignition device simulates the explosion condition of transformer oil under variable ambient temperature, and ignites the transformer oil specifically by controlling the heating plate to heat the transformer oil, generating transformer oil vapor and mixing it with air to form explosive gas, and igniting the explosive gas by an electronic igniter, or The ignition device simulates the explosion condition of transformer oil under variable ambient temperature, and ignites the transformer oil specifically by heating the heating chamber through an electric heating plate, and when the transformer oil vapor generated by the heating of the transformer oil is fully mixed with the air in the explosion chamber, the transformer oil is ignited by an electronic igniter.

10. The transformer oil explosion test method simulating variable ambient temperature according to claim 8, characterized in that: During the explosion of transformer oil, the combustion process is observed in real time through the first observation window and the second observation window.

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