High-altitude environment high-temperature simulation test device and method

Abstract

The application belongs to the technical field of power equipment test, and relates to a high-temperature simulation test device and method for high-altitude environment. The device comprises a heater, a temperature sensor, an air pressure sensor, a test box, a test insulator, a sleeve, an alternating current power supply and a grounding device. The heater is installed in the test box. The temperature sensor and the air pressure sensor are both installed on the inner wall of the test box. A temperature detection recorder is electrically connected with the temperature sensor, and an altitude detection recorder is electrically connected with the air pressure sensor. One end of the sleeve extends into the test box, and the other end is connected with the alternating current power supply. The test insulator is arranged in the test box and forms an electric circuit with the alternating current power supply through the sleeve. The test box is connected with the grounding device. The application can systematically simulate various complex working conditions of high temperature and high altitude combination, so as to comprehensively analyze and study the insulation characteristics, flashover voltage law and temperature field distribution of the test product in the coupling environment.

Description

Technical Field

[0001] This invention belongs to the field of power equipment testing technology, and relates to a high-temperature simulation test device and method for high-altitude environments. Background Technology

[0002] Core equipment such as power equipment and key components for rail transit play a vital role in energy supply and transportation systems in special regions such as plateaus and mountains, and their operational reliability is directly related to the safety and stability of the system. However, in environments with the combined effects of high altitude and high ground temperature, these equipment have long faced a series of prominent problems, including decreased insulation performance, sealing failure, material aging, and parameter drift. In severe cases, these problems can lead to electrical breakdown, mechanical failure, or even system paralysis, resulting in significant economic losses and safety risks.

[0003] From the perspective of environmental mechanisms, these problems mainly stem from the coupled effects of multiple environmental factors: low atmospheric pressure significantly reduces the breakdown strength of insulating media and exacerbates corona discharge; high-temperature environments, combined with the equipment's own heat generation, easily lead to temperature rises exceeding design limits, thereby accelerating the thermal aging process of insulation and structural materials and causing deformation and failure of sealing materials; simultaneously, low-oxygen conditions also affect heat dissipation efficiency and the chemical stability of some materials. The combined effect of these multiple factors significantly increases the probability of equipment failure. Related data shows that in high-altitude, high-temperature regions, more than half of equipment failures are directly related to performance degradation caused by this multi-environmental coupling effect, with insulation breakdown and material thermal aging being the most prominent issues.

[0004] With the continuous development of plateau regions, the actual operating environment of equipment is becoming increasingly complex, and the requirements for its reliability and environmental adaptability are also increasing. However, most current environmental testing devices can only simulate single or a few environmental factors (such as simple low pressure or high temperature), making it difficult to realistically reproduce the coupled operating conditions of high altitude and high ground temperature. Due to the lack of testing methods that can accurately simulate this comprehensive environment, potential defects of equipment cannot be fully exposed during the research and development and verification stages, leading to frequent failures caused by environmental coupling after commissioning, which seriously affects the system's operational safety and lifespan. Summary of the Invention

[0005] To address the problems in existing technologies, this invention provides a high-temperature simulation test device and method for high-altitude environments. This invention is applicable to insulators of power equipment and key insulation components for rail transit made of various materials such as ceramic, composite, and glass. It can systematically simulate complex operating conditions combining high ground temperature and high altitude, thereby enabling comprehensive analysis and research on the insulation characteristics, flashover voltage characteristics, and temperature field distribution of the test specimens under coupled environments.

[0006] To achieve the above objectives, the present invention employs the following technical solution: In a first aspect, the present invention provides a high-altitude environment high-temperature simulation test device, including a heater, a temperature sensor, a temperature detection recorder, a barometric pressure sensor, an altitude detection recorder, a test chamber, a test insulator, a bushing, an AC power supply, and a grounding device. The heater is installed inside the test chamber; the temperature sensor and the air pressure sensor are both installed on the inner wall of the test chamber; the temperature detection recorder and the altitude detection recorder are installed on the top of the test chamber; and the temperature detection recorder is electrically connected to the temperature sensor, and the altitude detection recorder is electrically connected to the air pressure sensor. One end of the bushing penetrates the side wall of the test chamber and extends into the interior of the test chamber, while the other end is connected to the AC power supply via a wire; the test insulator is installed inside the test chamber and forms an electrical circuit with the AC power supply through the bushing extending into the test chamber; the test chamber is connected to the grounding device via a wire.

[0007] Preferably, there are multiple heaters symmetrically distributed on both sides of the test insulator.

[0008] Preferably, a touch screen display is installed on the outer wall of the test chamber; the touch screen display is connected to the temperature detection recorder, the altitude detection recorder and the heater.

[0009] Preferably, it also includes a temperature control module, which is electrically connected to the touch screen display and the heater; the temperature control module is used to control the start / stop and power of the heater according to the target temperature parameter set by the touch screen display.

[0010] Preferably, the test chamber is a sealed pressure-bearing cavity structure, and an observation window is provided on the side wall of the test chamber.

[0011] Preferably, the grounding device is connected to the test chamber via a copper wire, and the grounding resistance of the grounding device is not greater than 4Ω.

[0012] Secondly, the present invention provides a method for simulating high ground temperature in high-altitude environments, comprising the following steps: The heater is controlled to heat the air in the test chamber and stabilize it at the preset target high ground temperature test temperature; AC voltage is applied to the test insulator through the AC power supply, and the voltage is gradually increased until the test insulator flashes over; the temperature and air pressure data during the test are collected and recorded in real time through the temperature sensor and the air pressure sensor, and the altitude parameters corresponding to the voltage, current, temperature and air pressure at the moment of flashover are recorded.

[0013] Preferably, controlling the heater to heat and stabilize the air inside the test chamber at a preset target temperature includes: Set the target high ground temperature test temperature on the touchscreen display; The temperature control module receives the target high ground temperature test temperature and controls the heater to start; The temperature sensor monitors the air temperature inside the test chamber in real time and feeds the temperature data back to the temperature control module. The temperature control module adjusts the power of the heater based on the feedback temperature data to bring the air temperature inside the test chamber to the target high ground temperature test temperature and maintain it.

[0014] Preferably, applying an AC voltage to the test insulator via the AC power supply includes: Close the switch of the AC power supply and apply an initial test voltage to the test insulator, the initial test voltage being lower than the expected flashover voltage; The voltage applied to the test insulator is gradually increased with a preset voltage step size and dwell time.

[0015] Preferably, after recording the altitude parameters corresponding to the voltage, current, temperature, and air pressure at the instant of the flashover, the method further includes: Adjust the preset target high ground temperature test temperature and / or the preset simulated altitude parameters corresponding to the barometric pressure sensor; repeat the high ground temperature simulation test and conduct comparative tests under different combinations of temperature and altitude parameters.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The test chamber, as a sealed pressure-bearing cavity, provides the physical basis for simulating low-pressure (high-altitude) environments. Heaters installed on the inner wall of the chamber heat the internal air to create high ground temperature conditions. Temperature and pressure sensors monitor the temperature and pressure inside the chamber in real time, transmitting the signals to a temperature detection recorder and an altitude detection recorder, respectively, enabling precise measurement and recording of environmental parameters. The test insulators placed inside the chamber are connected to an external AC power supply via bushings to form a test circuit, with the power supply applying gradually increasing voltages to assess their insulation strength. The grounding device is reliably connected to the test chamber shell to ensure safety during high-voltage testing. This invention can accurately and safely reproduce the harsh working conditions of high altitude and high ground temperature, and simultaneously collect environmental and electrical parameters, thereby systematically studying the flashover characteristics of insulators under this coupled environment. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the device of the present invention.

[0019] The components include: 1. Heater; 2. Temperature sensor; 3. Temperature detection recorder; 4. Barometric pressure sensor; 5. Altitude detection recorder; 6. Test chamber; 7. Test insulator; 8. Bushing; 9. AC power supply; 10. Grounding device. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0026] The present invention will now be described in further detail with reference to the accompanying drawings: This invention provides a high-temperature simulation test device for high-altitude environments, such as... Figure 1 As shown, it includes heater 1, temperature sensor 2, temperature detection recorder 3, air pressure sensor 4, altitude detection recorder 5, test chamber 6, test insulator 7, bushing 8, AC power supply 9, and grounding device 10. The heater 1 is installed inside the test chamber 6; the temperature sensor 2 and the air pressure sensor 4 are both installed on the inner wall of the test chamber 6; the temperature detection recorder 3 and the altitude detection recorder 5 are installed on the top of the test chamber 6; and the temperature detection recorder 3 is electrically connected to the temperature sensor 2, and the altitude detection recorder 5 is electrically connected to the air pressure sensor 4. One end of the bushing 8 penetrates the side wall of the test chamber 6 and extends into the interior of the test chamber 6, while the other end is connected to the AC power supply 9 via a wire; the test insulator 7 is disposed inside the test chamber 6 and forms an electrical circuit with the AC power supply 9 through the bushing 8 extending into the test chamber 6; the test chamber 6 is connected to the grounding device 10 via a wire.

[0027] The test chamber 6, as the core container, provides a sealed and pressurized test space. Temperature sensors 2 and pressure sensors 4, installed on its inner walls, monitor the temperature and pressure parameters of the test environment in real time, providing crucial feedback signals for environmental simulation. These signals are transmitted to a temperature monitoring recorder 3 (range: -50°C to 150°C, accuracy: ±0.1°C) and an altitude monitoring recorder 5 (range: 50kPa to 101kPa) located on the top of the chamber, enabling accurate measurement, continuous recording, and status monitoring of high ground temperature and high altitude (low air pressure) conditions. Both recorders can simultaneously receive and store multiple data streams, facilitating analysis and processing in the later stages of the test. A heater 1, located inside the chamber, heats the air inside according to instructions, serving as the actuator for generating and maintaining the preset high ground temperature conditions. The test insulator 7 is placed in this simulated environment, with its high-voltage end connected to an external AC power supply 9 via a bushing 8 (ensuring the chamber's airtightness while introducing high voltage). The power supply applies an adjustable high-voltage excitation (0~150kV) to simulate the actual operating voltage. The entire metal casing of the test chamber 6 is reliably grounded through the grounding device 10, forming a safety circuit and effectively ensuring the safety of personnel and equipment during high-voltage testing. The components of this invention have clearly defined functions and are tightly connected, effectively reproducing the complex working conditions of high altitude and high ground temperature, providing a reliable experimental basis for studying the electrical performance degradation and flashover characteristics of insulating materials.

[0028] Multiple heaters 1 are symmetrically distributed on both sides of the test insulator 7. By heating symmetrically on both sides, uneven temperature gradients caused by a single heat source can be effectively avoided, ensuring that the test insulator 7 is in a high-temperature environment that meets the preset requirements and has a uniform spatial distribution throughout the test, thereby more realistically simulating actual high ground temperature conditions.

[0029] A touchscreen display is installed on the outer wall of the test chamber 6; the touchscreen display is connected to the temperature detection recorder 3, the altitude detection recorder 5, and the heater 1. This touchscreen display serves as the core interface for human-computer interaction, allowing operators to intuitively monitor the temperature and air pressure (altitude) data inside the test chamber in real time, and directly set and adjust key parameters such as the target temperature and heating rate of the heater 1, achieving closed-loop precise control of the high-temperature environment.

[0030] The high ground temperature simulation test device of the present invention also includes a temperature control module, which is electrically connected to the touch screen display and the heater 1. The temperature control module integrates a logic control unit, which can receive parameters such as the target temperature value, allowable deviation and heating rate set by the touch screen display in real time, and continuously acquire actual ambient temperature data fed back from the temperature detection recorder 3. By comparing the set value and the measured value, the temperature control module automatically generates control commands to adjust the start-stop state and output power of the heater 1 (for example, by using mature control algorithms such as proportional-integral-derivative (PID)), thereby achieving precise, dynamic and stable control of the temperature inside the test chamber 6.

[0031] The test chamber 6 is a sealed pressure chamber structure. This structure is designed to withstand and maintain a stable low air pressure corresponding to the target high-altitude environment (such as simulating air pressure conditions at an altitude of several thousand meters), while effectively isolating external environmental interference and ensuring the independence of the test conditions inside the chamber. The observation window on its side wall is made of high-strength, heat-resistant, and light-transmitting material (such as multi-layer tempered glass or special organic glass), which has good sealing performance and optical clarity.

[0032] The grounding device 10 is reliably connected to the metal casing of the test chamber 6 via a copper conductor with a cross-sectional specification that meets the safe current-carrying requirements. Through reasonable grounding electrode design and construction, the grounding resistance value of the entire grounding circuit is ensured to be consistently no greater than 4Ω. This low-impedance grounding path provides a fast and effective discharge channel for the test system, especially for transient high currents and overvoltages that may occur during high-voltage flashover tests. This reliably clamps the potential of the test chamber and connected metal components within a safe range, effectively preventing electric shock hazards caused by energized chambers or potential rises, and ensuring the personal safety of operators. Simultaneously, good grounding significantly reduces stray interference in the test circuit, which is beneficial for improving the accuracy of electrical parameter measurements. This provides an indispensable safety and technical foundation for conducting high-voltage insulation tests under harsh conditions of high altitude and high ground temperature.

[0033] Furthermore, the temperature detection recorder 3 is electrically connected to the temperature sensor 2 via shielded wires, and the altitude detection recorder 5 is electrically connected to the barometric pressure sensor 4 via shielded wires. The shielding layer effectively isolates high-frequency electromagnetic noise and common-mode interference generated at the test site due to high-voltage discharge, high-power equipment start-up and shutdown, and power fluctuations, ensuring that the weak temperature and barometric pressure simulation signals maintain a high degree of integrity and authenticity during transmission to the recorder.

[0034] A second objective of this invention is to provide a method for simulating high ground temperature in high-altitude environments, comprising the following steps: Test Platform Setup: Based on the required test accuracy, temperature sensor 2 and pressure sensor 4 are fixed to designated positions on the inner wall of test chamber 6. Then, the signal output of temperature sensor 2 is connected to temperature detection recorder 3, and the signal output of pressure sensor 4 is connected to altitude detection recorder 5. Signal transmission stability and proper functioning of all data acquisition channels are confirmed. Next, ensuring that AC power supply 9 is not powered, test insulator 7 is connected to AC power supply 9 via wires according to circuit requirements. Simultaneously, the metal casing of test chamber 6 is reliably connected to grounding device 10 via wires. Finally, the wired test insulator 7 is placed inside test chamber 6, and its spatial position is adjusted so that heaters 1 on both sides are symmetrically distributed at both ends of the insulator, completing the setup and initial state debugging of the entire test platform.

[0035] Simulation experiment: The heater 1 is controlled to heat the air in the test chamber 6 and stabilize it at the preset target high ground temperature test temperature; AC voltage is applied to the test insulator 7 through the AC power supply 9, and the voltage is gradually increased until the test insulator 7 flashes over; the temperature and air pressure data during the test are collected and recorded in real time through the temperature sensor 2 and the air pressure sensor 4, and the altitude parameters corresponding to the voltage, current, temperature and air pressure at the moment of flashover are recorded.

[0036] This method utilizes heater 1 to bring the air inside test chamber 6 to a preset high ground temperature and stabilize it. Simultaneously, the inherent pressure-bearing characteristics of test chamber 6 simulate the corresponding high-altitude, low-pressure conditions. Subsequently, after the environmental parameters stabilize, an AC test voltage is applied and gradually increased to simulate operating voltage and overvoltage stress until flashover of the test insulator 7 is induced. Throughout the process, ambient temperature, air pressure, and electrical parameters are recorded synchronously and continuously, and the instantaneous voltage and current peak values ​​and corresponding environmental conditions are captured at the flashover critical point. This method achieves a systematic simulation of insulator flashover behavior and complete acquisition of key parameters under complex high-altitude, high-temperature environments, providing a reliable and efficient experimental means for in-depth research on the insulation performance degradation mechanism and flashover voltage characteristics of insulating materials under different environmental stress coupling effects.

[0037] The principle behind the flashover of test insulator 7 is as follows: Under the combined effect of high ground temperature and low air pressure, on the one hand, the continuous high temperature accelerates the aging process of the insulating material, which may lead to a decrease in its dielectric properties and a weakening of its mechanical strength; on the other hand, the low air pressure environment significantly reduces the breakdown field strength of the air insulating medium (or along the surface flashover path). As the voltage applied by AC power supply 9 gradually increases, the electric field energy accumulated in test insulator 7 and its surrounding medium continues to increase. Under the combined adverse effects of material performance degradation and dielectric strength reduction, the effective withstand capability of the insulation system gradually approaches its limit. Finally, when the local electric field strength exceeds the critical breakdown threshold under these environmental conditions, a penetrating discharge along the surface or in the air will be induced, resulting in a flashover.

[0038] For example, controlling the heater 1 to heat and stabilize the air inside the test chamber 6 at a preset target temperature includes: The operator first sets the target high ground temperature test value via the touchscreen display on the outer wall of the test chamber 6. This set value is then sent to the temperature control module. The temperature control module then controls the heater 1 to start heating the air inside the chamber. During this process, the temperature sensor 2, pre-installed on the inner wall of the test chamber 6, continuously and in real time monitors the air temperature in the test area and feeds the measured temperature data back to the temperature control module. The control unit inside the temperature control module (usually based on classic control algorithms such as PID) compares and calculates the real-time temperature data with the set target temperature, and dynamically outputs control signals to precisely adjust the output power of the heater 1 (e.g., by adjusting the duty cycle or voltage), thereby overcoming interference such as environmental heat loss. Ultimately, the air temperature inside the test chamber 6 quickly and stably reaches the preset target high ground temperature test temperature, and its fluctuations are maintained within the allowable error range throughout the entire test.

[0039] For example, applying an AC voltage to the test insulator 7 via the AC power supply 9 includes: The AC power supply 9 is switched on, and a pre-set initial test voltage is applied to the test insulator 7. This voltage value is typically much lower than the expected flashover voltage estimated based on experience or theory, to ensure the safety and stability of the initial state. Subsequently, according to a preset voltage ramp-up strategy (e.g., setting a constant voltage step size ΔU and maintaining a defined dwell time Δt at each voltage level), the AC voltage applied to both ends of the test insulator 7 is gradually and smoothly increased in an automatic or manual control manner. This invention adopts a method of starting from a low initial voltage and slowly ramping up the voltage in fixed steps. This effectively avoids uncontrollable shocks or damage to the test specimen that may be caused by sudden voltage changes, and allows the charge distribution and partial discharge activity inside the insulator to develop gradually, more realistically simulating the actual operating condition where the voltage gradually rises to the fault. At the same time, the constant step size and dwell time standardize each voltage ramp-up process, which not only improves the controllability and safety of the test, but also provides a clear and repeatable voltage ramp-up trajectory for accurately capturing and determining the critical flashover voltage value of the insulator in this specific high-altitude and high-temperature coupling environment, thereby ensuring the accuracy and comparability of the test data.

[0040] After recording the altitude parameters corresponding to the voltage, current, temperature, and air pressure at the moment of the flashover, the method further includes: Adjust the preset target high ground temperature test temperature and / or the preset simulated altitude parameter corresponding to the barometric pressure sensor 4; repeat the high ground temperature simulation test and conduct comparative tests under different combinations of temperature and altitude parameters.

[0041] By obtaining a series of flashover voltage and characteristic data under different temperature-altitude combination conditions, we can plot the correlation curve between insulation performance and environmental parameters or establish empirical models, thereby revealing in depth the degradation mechanism of insulation materials under complex environmental stress, and providing crucial experimental data support and theoretical basis for the differentiated design of external insulation of electrical equipment in high-altitude and high-temperature areas, safety margin assessment, and the formulation of operation and maintenance standards.

[0042] Example This embodiment provides a high-altitude ground temperature simulation test method, including: S1. Test Platform Setup S11. According to the test accuracy requirements, the temperature sensor 2 and the air pressure sensor 4 are fixedly installed at predetermined positions on the inner wall of the test chamber 6. Then, the signal output terminal of the temperature sensor 2 is connected to the temperature detection recorder 3 using shielded wires, and the air pressure sensor 4 is connected to the altitude detection recorder 5. The signal transmission is checked and confirmed to be stable and the data acquisition channels of each recorder are working normally.

[0043] S12. Connect the high-voltage end of the test insulator 7 to the internal conductor of the bushing 8 via a conductor, and then connect the high-voltage line led out from the bushing 8 to the high-voltage output end of the AC power supply 9, which is in a de-energized state, to form a basic electrical test circuit. At the same time, use qualified copper conductors to reliably connect the metal shell of the test chamber 6 to the grounding device 10 with a grounding resistance of no more than 4Ω to ensure that the entire test platform has a complete safety ground.

[0044] S13. Place the connected test insulator 7 into the test chamber 6 and adjust its spatial position so that the symmetrically distributed heaters 1 can evenly heat the test specimen and its surrounding environment. After completing all physical connections, perform preliminary debugging of the system to confirm that the touch screen display, temperature control module, and recorders are functioning normally. The platform setup is now complete.

[0045] S2, Simulation Test S21. The operator sets the target high ground temperature value (e.g., 80°C) and related control parameters (e.g., heating rate) to be simulated for this test using the touchscreen display on the outer wall of the test chamber 6. After the system is started, the temperature control module will automatically control the operation of heater 1 according to the set value to heat the air inside the test chamber 6. At the same time, the test chamber 6, as a sealed pressure chamber, has a low air pressure environment corresponding to the target high altitude pre-set or maintained. The system runs until the temperature inside the chamber reaches the set value and remains stable, at which point the required high-altitude high ground temperature coupled test environment has been successfully constructed. The test status can be visually monitored through the observation window.

[0046] S22. After confirming that the environmental parameters are stable and meet the requirements, close the circuit of AC power supply 9 and start applying the predetermined starting AC voltage to the test insulator 7.

[0047] S23. Under the condition of maintaining a stable simulated environment, the voltage applied to the test insulator 7 is gradually increased at a specified rate. During this process, the temperature detection recorder 3 and the altitude detection recorder 5 continuously record environmental parameters. When the voltage rises to the instant when the test insulator 7 flashes over, the system (or manually) simultaneously captures and records the critical flashover voltage value, leakage current value, real-time temperature inside the chamber, and corresponding air pressure (altitude) value at the moment of flashover.

[0048] S24. This completes a full flashover test under simulated conditions. After recording all data, reduce the output voltage of AC power supply 9 to zero and disconnect the power. If repeatability tests or comparative tests under different conditions are required, wait for the temperature inside the test chamber 6 to cool naturally or be forced to a safe range, then reset all system parameters to their initial state, and repeat steps S21~S24 to perform a new round of tests.

[0049] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-altitude geothermal simulation test device, characterized in that, It includes a heater (1), a temperature sensor (2), a temperature detection recorder (3), a barometric pressure sensor (4), an altitude detection recorder (5), a test chamber (6), a test insulator (7), a bushing (8), an AC power supply (9), and a grounding device (10). The heater (1) is installed inside the test chamber (6); the temperature sensor (2) and the air pressure sensor (4) are both installed on the inner wall of the test chamber (6); the temperature detection recorder (3) and the altitude detection recorder (5) are installed on the top of the test chamber (6); and the temperature detection recorder (3) is electrically connected to the temperature sensor (2), and the altitude detection recorder (5) is electrically connected to the air pressure sensor (4); One end of the bushing (8) passes through the side wall of the test chamber (6) and extends into the interior of the test chamber (6), while the other end is connected to the AC power supply (9) via a wire; the test insulator (7) is installed inside the test chamber (6) and forms an electrical circuit with the AC power supply (9) through the bushing (8) extending into the interior of the test chamber (6); the test chamber (6) is connected to the grounding device (10) via a wire.

2. The high-altitude geothermal simulation test device according to claim 1, characterized in that, There are multiple heaters (1), which are symmetrically distributed on both sides of the test insulator (7).

3. The high-altitude geothermal simulation test device according to claim 1, characterized in that, The test chamber (6) is equipped with a touch screen display on its outer wall; the touch screen display is connected to the temperature detection recorder (3), the altitude detection recorder (5) and the heater (1).

4. The high-altitude geothermal simulation test device according to claim 3, characterized in that, It also includes a temperature control module, which is electrically connected to the touch screen display and the heater (1); the temperature control module is used to control the start-up, shutdown and power of the heater (1) according to the target temperature parameters set by the touch screen display.

5. A high-altitude geothermal simulation test device according to claim 1, characterized in that, The test chamber (6) is a closed pressure-bearing cavity structure, and an observation window is provided on the side wall of the test chamber (6).

6. The high-altitude geothermal simulation test device according to claim 1, characterized in that, The grounding device (10) is connected to the test box (6) through a copper wire, and the grounding resistance of the grounding device (10) is not greater than 4Ω.

7. A method for simulating high ground temperature in high-altitude environments, characterized in that, The apparatus according to any one of claims 1 to 6 includes the following steps: The heater (1) is controlled to heat the air in the test chamber (6) and stabilize it at the preset target high ground temperature test temperature; AC voltage is applied to the test insulator (7) through the AC power supply (9), and the voltage is gradually increased until the test insulator (7) flashes over; the temperature and air pressure data during the test are collected and recorded in real time through the temperature sensor (2) and the air pressure sensor (4), and the altitude parameters corresponding to the voltage, current, temperature and air pressure at the moment of flashover are recorded.

8. The high-altitude geothermal simulation test method according to claim 7, characterized in that, The control of the heater (1) to heat and stabilize the air in the test chamber (6) at a preset target temperature includes: Set the target high ground temperature test temperature on the touchscreen display; The temperature control module receives the target high ground temperature test temperature and controls the heater (1) to start; The temperature sensor (2) monitors the air temperature inside the test chamber (6) in real time and feeds the temperature data back to the temperature control module. The temperature control module adjusts the power of the heater (1) based on the feedback temperature data to make the air temperature inside the test chamber (6) reach and maintain the target high ground temperature test temperature.

9. A high-altitude geothermal simulation test method according to claim 7, characterized in that, The application of AC voltage to the test insulator (7) via the AC power supply (9) includes: Close the switch of the AC power supply (9) and apply an initial test voltage to the test insulator (7), the initial test voltage being lower than the expected flashover voltage; The voltage applied to the test insulator (7) is gradually increased with a preset voltage step size and dwell time.

10. A high-altitude geothermal simulation test method according to claim 7, characterized in that, After recording the altitude parameters corresponding to the voltage, current, temperature, and air pressure at the moment of the flashover, the method further includes: Adjust the preset target high ground temperature test temperature and / or the preset simulated altitude parameter corresponding to the air pressure sensor (4); repeat the high ground temperature simulation test and conduct comparative tests under different temperature and altitude parameter combinations.

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