Automatic test method and system for factory temperature rise test of inflatable switch cabinet

Abstract

The invention belongs to the technical field of electrical performance test, and particularly relates to an automatic test method and system for an inflatable switch cabinet factory temperature rise test, and the method comprises the steps: obtaining an original test point temperature sequence and an original environment temperature sequence, executing the noise suppression, and outputting a test point temperature observation value sequence and an environment temperature observation value sequence; acquiring a temperature rise evolution rate based on the observed value; the change gradient of the temperature rise evolution rate is analyzed, and convective stationary factors are obtained in combination with the temperature difference; in a preset disturbance observation window, integral accumulation compensation is carried out on the environment temperature change gradient by using a time weighting core, and a balance judgment index is generated through maximum value search; and determining a thermal equilibrium state based on the equilibrium determination index and the convective stationary factor and executing physical closed-loop control. According to the invention, the problem of advanced shutdown caused by judgment artifacts generated by environment temperature drift is solved, and the automation level and the test reliability of a temperature rise test are improved.

Description

Technical Field

[0001] This invention relates to the field of electrical performance testing technology. More specifically, this invention relates to an automatic testing method and system for the factory temperature rise test of gas-insulated switchgear. Background Technology

[0002] Gas-insulated switchgear is a widely used power distribution equipment in power systems, and its operational reliability is directly related to the safety and stability of the power grid. The factory temperature rise test is a core means of verifying the quality of the switchgear's conductive connections, the rationality of its structural design, and the heat dissipation performance of the insulating medium, and it occupies an important position in the quality control process. This test usually requires injecting the rated current into the equipment under test in the laboratory through a high current generator and continuously monitoring the temperature at each measuring point until a specific thermal balance criterion is met, in order to obtain stable temperature rise data of the equipment under rated operating conditions.

[0003] In complex test environments, the strong alternating electromagnetic fields associated with high-current operation generally cause severe electromagnetic induction interference to temperature sensors and their signal transmission cables. This induced current causes a large number of random spikes and non-physical jumps in the raw temperature data acquired by the acquisition system. If not processed carefully, this will directly affect the accurate judgment of the subsequent temperature rise trend.

[0004] The natural convection caused by the insulating gas filling the gas-filled switchgear after being heated has typical nonlinear characteristics. The heat transfer process from the internal conductive circuit to the outer shell surface and from the outer shell surface to the surrounding environment has obvious time lag. This causes the internal heat field distribution to be in an unstable state for a long time during the test. Local heat accumulation or airflow disturbance can easily cause the illusion of temperature fluctuation.

[0005] The ambient temperature inside the laboratory is not constant. The slow temperature drift of the external environment dynamically couples with the temperature rise process of the switchgear itself, causing slight fluctuations in the temperature rise curve at the measuring point due to environmental disturbances as it approaches equilibrium. Traditional judgment methods rely heavily on real-time manual observation of monitoring data, subjectively judging whether thermal equilibrium has been reached by calculating the temperature rise change per unit time. However, due to the lack of effective means to suppress electromagnetic noise and compensation mechanisms for environmental disturbances, the judgment results often have significant lag or risk of misjudgment. This situation makes it difficult to effectively optimize the temperature rise test cycle, and the testing process lacks closed-loop automatic control logic. This not only consumes a lot of manpower and time costs but also makes it difficult to ensure the consistency and accuracy of temperature rise performance evaluation for each product leaving the factory. Summary of the Invention

[0006] To address the technical problems in the factory temperature rise test of gas-insulated switchgear, such as temperature signal distortion caused by strong electromagnetic interference, inaccurate determination of equilibrium state due to environmental temperature drift and internal convection instability, and low testing efficiency and difficulty in closed-loop control due to reliance on manual monitoring, this invention provides solutions in the following aspects.

[0007] In a first aspect, the present invention provides an automatic testing method for a factory-delivered temperature rise test of a gas-insulated switchgear, comprising: acquiring the original measuring point temperature sequence and the original ambient temperature sequence of the gas-insulated switchgear and smoothing them to obtain a measuring point temperature observation value sequence and an ambient temperature observation value sequence; obtaining the temperature rise evolution rate based on the measuring point temperature observation values ​​in the measuring point temperature observation value sequence and the ambient temperature observation values ​​in the ambient temperature observation value sequence; obtaining a convection stability factor based on the temperature rise evolution rate, the measuring point temperature observation values ​​in the measuring point temperature observation value sequence and the ambient temperature observation values ​​in the ambient temperature observation value sequence; obtaining a balance determination index based on the temperature rise evolution rate, the ambient temperature observation values ​​in the ambient temperature observation value sequence and a preset disturbance observation window duration; determining the thermal balance state of the gas-insulated switchgear based on the balance determination index and the convection stability factor and performing physical closed-loop control based on the thermal balance state.

[0008] This invention improves the automation level of factory temperature rise testing for gas-insulated switchgear by acquiring and smoothing the original temperature sequence, combining the temperature rise evolution rate, convection stability factor, and balance determination index to determine the thermal balance state and execute physical closed-loop control.

[0009] Preferably, obtaining the temperature rise evolution rate includes: In the formula, for The rate of temperature evolution at any given time, for Temperature observations at the measuring points at any given time. for The ambient temperature observation value at that time. This is the heat dissipation damping coefficient. It is an exponential function. This is the differential symbol.

[0010] This invention introduces an exponential relationship between the heat dissipation damping coefficient and the temperature difference when calculating the temperature rise evolution rate, enabling the system to capture minute heat changes when it is close to thermal equilibrium, thereby improving the accuracy of the evaluation of the heat dissipation characteristics of the gas-insulated switchgear.

[0011] Preferably, the heat dissipation damping coefficient is obtained by performing least squares fitting on the temperature rise data within the previous complete maintenance cycle and extracting the attenuation curvature in the quasi-equilibrium section to determine the value of the heat dissipation damping coefficient.

[0012] This invention uses temperature rise data from the previous maintenance cycle to determine the heat dissipation damping coefficient through least squares fitting, so that the calculated parameters match the actual physical characteristics of the equipment under test, reducing the judgment error caused by improper parameter settings.

[0013] Preferably, the convection stationarity factor satisfies the expression: In the formula, for The convection stationary factor at time, for Temperature observations at the measuring points at any given time. for The ambient temperature observation value at that time. for The rate of temperature evolution at any given time, For the convective response coefficient, The symbol for the natural logarithm. It is the absolute value symbol. This is the differential symbol.

[0014] This invention utilizes the product of a logarithmic term and the gradient of the temperature rise evolution rate to obtain a convection stability factor. By evaluating the degree of thermal field coupling of the internal insulating gas, it reduces the interference caused by local convection fluctuations inside the gas-filled switchgear.

[0015] Preferably, the convective response coefficient is obtained by performing second-order difference calculation on the temperature rise curve during the first 15 minutes of the test start-up phase, and determining the value of the convective response coefficient by using the ratio of the peak value to the predicted steady-state temperature rise value.

[0016] This invention achieves dynamic compensation for convection time delay by performing second-order difference calculation on the temperature rise curve during the test start-up phase and obtaining the convection response coefficient, thereby improving the ability to identify the unstable state of the internal thermal field of the gas-filled switchgear.

[0017] Preferably, the balance determination index satisfies the expression: In the formula, express Indicators for determining balance at any given moment; This indicates the preset duration of the disturbance observation window; This represents any time within the disturbance observation window; Indicates the environmental sensitivity coefficient; express The rate of temperature rise evolution at any given time; Indicates the time variable of integration; Indicates in The ambient temperature observation value at that moment; This represents the maximum value operation; Represents the differential symbol.

[0018] Preferably, the environmental sensitivity coefficient is obtained by performing third-order difference on the environmental temperature observation values ​​to obtain higher-order fluctuation characteristics, and using the least squares method to fit the synchronous correlation between the environmental temperature observation values ​​and the temperature of the gas-insulated switchgear enclosure to determine the value of the environmental sensitivity coefficient.

[0019] Preferably, determining the thermal balance state of the gas-insulated switchgear includes: comparing the balance determination index with a preset thermal balance determination threshold; and determining that the gas-insulated switchgear has achieved thermal balance when the balance determination index is less than the thermal balance determination threshold, the convection stability factor is lower than the preset convection stability threshold, and the duration exceeds a preset time threshold.

[0020] This invention compares the balance determination index, the convection stability factor and their respective thresholds and combines them with the duration to determine thermal balance. Through comprehensive logical evaluation of multi-dimensional factors, it reduces the situation of premature termination or delayed shutdown during the temperature rise test.

[0021] Preferably, the physical closed-loop control based on thermal equilibrium includes: in response to determining that the gas-insulated switchgear has reached thermal equilibrium, sending a current cut-off command to the high-current generator and adjusting the internal voltage regulator of the high-current generator to zero, and locking the current temperature observation value of the measuring point as the final factory test report data.

[0022] This invention automatically sends instructions to the high-current generator and locks the temperature observation value of the measuring point based on the thermal balance determination result, realizing a physical closed loop in the testing process and reducing human interference in the generation of factory test reports for gas-insulated switchgear.

[0023] Secondly, the present invention provides an automatic testing system for factory temperature rise test of gas-insulated switchgear, comprising a processor and a memory, wherein the memory stores computer program instructions, and when the computer program instructions are executed by the processor, the above-mentioned automatic testing method for factory temperature rise test of gas-insulated switchgear is implemented.

[0024] By adopting the above technical solution, an automatic test method for the factory temperature rise test of an inflatable switchgear is generated into a computer program and stored in a memory for loading and execution by a processor. This allows for the creation of terminal equipment based on the memory and processor, facilitating its use.

[0025] The beneficial effects of this invention are as follows: This invention utilizes recursive smoothing technology to suppress induced noise generated by strong electromagnetic fields, obtains a temperature sequence with physical continuity, and reduces outlier interference in the raw data acquisition during the temperature rise test of gas-insulated switchgear.

[0026] This invention obtains a balance judgment index by introducing an environmental sensitivity coefficient and an integral compensation mechanism, assesses the impact of environmental temperature drift on the tested equipment, and reduces the lag in judgment results caused by external environmental fluctuations.

[0027] This invention combines convection stability factor and physical closed-loop control logic to realize automated testing process, improves the consistency of temperature rise performance evaluation of gas-insulated switchgear at the factory, and reduces human resource input in the testing process. Attached Figure Description

[0028] Figure 1 This is a flowchart illustrating an automatic testing method for a factory temperature rise test of an inflatable switchgear according to the present invention. Figure 2 This is a schematic diagram illustrating the relationship between the rate of temperature rise and changes in the temperature observation sequence; Figure 3 This is a schematic diagram illustrating the changes in the comprehensive indicators for determining the thermal balance state. Detailed Implementation

[0029] 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, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0031] This invention discloses an automatic testing method for the factory temperature rise test of gas-insulated switchgear, referring to... Figure 1 This includes steps S1-S5: S1. Obtain the original temperature sequence of the measuring point and the original ambient temperature sequence of the gas-insulated switchgear and perform smoothing to obtain the temperature observation sequence of the measuring point and the ambient temperature observation sequence.

[0032] It should be noted that during the factory temperature rise test of the gas-insulated switchgear, the high-current generator on site will generate a strong alternating electromagnetic field. This electromagnetic field will cause serious induced noise interference to the temperature sensor and its transmission line, resulting in the original temperature sequence of the measurement point containing a large number of random fluctuations and outliers. If these noises are not effectively suppressed, they will directly interfere with the subsequent assessment of the temperature rise evolution trend and the determination of thermal balance, thereby reducing the reliability of the test.

[0033] Specifically, this invention employs standard electromagnetically shielded thermocouples to deploy at multiple points on the inlet and outlet bushings, busbar connection points, and characteristic points of the outer casing of the gas-insulated switchgear; using a sampling frequency... The system collects the original temperature sequences of each measuring point and the corresponding original ambient temperature sequences in real time. It then uses the standard Kalman filter algorithm to recursively smooth the original sequences, removes outliers, and outputs a physically continuous sequence of measuring point temperature observations and an ambient temperature observation sequence.

[0034] S2. Obtain the temperature rise evolution rate based on the temperature observations at the measurement points in the temperature observation sequence and the ambient temperature observations in the ambient temperature observation sequence.

[0035] It should be noted that heat transfer inside the gas-insulated switchgear is a complex nonlinear process. As the temperature of the internal conductive circuit increases, the temperature difference between it and the external environment gradually increases, and the dissipation rate to the environment also changes accordingly. When the internal heat generation rate and the dissipation rate to the environment tend to be in dynamic equilibrium, the temperature rise evolution rate will exhibit a non-exponential decay characteristic. This invention introduces a heat dissipation damping coefficient to capture this dynamic evolution momentum that changes with the temperature difference, providing a basis for determining the thermal equilibrium.

[0036] Specifically, this invention calculates the rate of change of the temperature observation at the measuring point with discrete time steps based on the sequence of temperature observations at the measuring point, and obtains the temperature rise evolution rate of the temperature observation at the measuring point by combining the ambient temperature observation.

[0037] The rate of temperature rise evolution satisfies the following expression:

[0038] In the formula, express The rate of temperature rise evolution at any given time; express Temperature observations at the measuring points at any given time; express The ambient temperature observation value at that moment; Indicates the heat dissipation damping coefficient; This represents an exponential function with the natural logarithm as its base.

[0039] In the formula, when the temperature observation value at the measuring point is... Compared with ambient temperature observations As the difference gradually decreases, the value within the exponential term will increase accordingly, thus affecting the calculated rate of temperature rise. It is more sensitive to minute changes in heat, ensuring that the system still has extremely high evaluation accuracy when it is close to equilibrium.

[0040] It should be further noted that the heat dissipation damping coefficient in this invention... It is determined by performing least-squares fitting on the temperature rise data during the previous complete maintenance cycle and extracting the decay curvature in the quasi-equilibrium phase. The empirical range for this parameter is 0.05 to 0.15; if the heat dissipation damping coefficient... Taking a value that is too large will lead to an excessively high rate of temperature rise evolution. Being overly sensitive to temperature changes can easily lead to misinterpreting small fluctuations in ambient temperature as internal thermal variations; if the heat dissipation damping coefficient... If the value is too small, it will weaken the ability to capture subtle trends near the equilibrium state. Based on the typical heat dissipation characteristics of gas-insulated switchgear, the present invention selects values ​​within this range to effectively balance sensitivity and stability.

[0041] For example, Figure 2 This diagram illustrates the relationship between the temperature rise evolution rate and the temperature observation sequence. The figure shows that after smoothing, the original temperature sequence at each measurement point was freed from high-frequency noise interference, resulting in a continuous and smooth sequence of temperature observations. As the experiment progressed, the temperature at each measurement point gradually increased and stabilized. The temperature rise evolution rate calculated based on these observations exhibited a clear nonlinear decay trend. This rate can sensitively reflect the dynamic thermal characteristics of the gas-insulated switchgear during the heating process, providing a reliable data foundation for subsequent thermal balance analysis.

[0042] S3. Obtain the convection stability factor based on the temperature rise evolution rate, the temperature observations at the measuring points in the temperature observation sequence, and the environmental temperature observations in the environmental temperature observation sequence.

[0043] It should be noted that the insulating gas filling the gas-filled switchgear will form convection after being heated. This convection is often unstable in the early stage of the test, and there is a local heat accumulation phenomenon. Only when the internal airflow forms a stable circulation and the thermal field distribution tends to be coupled and consistent, the temperature rise evolution process truly enters the stable stage. This invention obtains the convection stability factor to evaluate the stability of the internal thermal field, thereby eliminating the false balance interference caused by local convection fluctuations.

[0044] Specifically, this invention obtains a convection stability factor characterizing the degree of thermal field coupling by analyzing the gradient of the temperature rise evolution rate and combining the difference between the measured temperature and the ambient temperature.

[0045] The convection stationarity factor satisfies the following expression:

[0046] In the formula, express The convection stationary factor at any given time; express Temperature observations at the measuring points at any given time; express The ambient temperature observation value at that moment; express The rate of temperature rise evolution at any given time; Indicates the convective response coefficient; Represents the symbol for the natural logarithm; Represents the absolute value symbol.

[0047] In the formula, when the temperature rise evolution rate When the absolute value of the rate of change gradually approaches zero, it indicates that the internal heat exchange has stabilized. At this point, the value of the logarithmic term approaches zero, driving the convection stability factor. The rapid convergence reflects the highly coupled state of the internal thermal field.

[0048] It should be further noted that the convective response coefficient in this invention... The value is determined by performing a second-order difference calculation on the temperature rise curve during the first 15 minutes of the test, and using the ratio of its peak value to the predicted steady-state temperature rise. The empirical range for this parameter is 200 to 500. If the convective response coefficient Setting it too high will amplify the rate of temperature rise evolution. The second-order noise leads to the convection stationarity factor Frequent fluctuations; if the convective response coefficient If the value is set too small, the identification of flow field instability will be delayed. The present invention selects a value within this range to ensure accurate dynamic compensation for convection time delay.

[0049] S4. Based on the temperature rise evolution rate, the ambient temperature observation value in the ambient temperature observation value sequence and the preset disturbance observation window duration, obtain the balance determination index.

[0050] It should be noted that this invention addresses the issue that the slow drift of observed ambient temperature at the experimental site can be superimposed on the temperature rise curve, producing judgment artifacts. Compensation based solely on endpoint differences cannot reflect the fluctuating momentum of ambient temperature drift within the observation period. Therefore, this invention utilizes a maximum search operator and incorporates a time-weighted kernel into the integral term to obtain a balance judgment index that reflects the complexity of environmental trends.

[0051] Specifically, this invention outputs a balance determination index based on the rate of temperature rise evolution and the weighted cumulative amount of environmental temperature change.

[0052] The balance determination index satisfies the following expression:

[0053] In the formula, express Indicators for determining balance at any given moment; This indicates the preset duration of the disturbance observation window; This represents any time within the disturbance observation window; Indicates the environmental sensitivity coefficient; express The rate of temperature rise evolution at any given time; Indicates the time variable of integration; Indicates in The ambient temperature observation value at that moment; This represents the maximum value operation; Represents the differential symbol.

[0054] In the formula, the expression breaks the linear cancellation logic of simple differentiation and integration by introducing a linearly increasing time weighting factor inside the integral; as the environmental temperature observation value... As the fluctuation slope increases closer to the current moment in the observation window, the weighting factor also increases synchronously. This causes the integral term to no longer depend solely on the endpoint difference, but instead has a significant gain effect on the recent temperature drift trend. This increases the value of the compensation term, driving the balance determination index. Maintaining a high level of temperature during periods of environmental instability effectively prevents premature shutdown caused by unbalanced heating inside the gas-insulated switchgear due to environmental cooling masking the problem of temperature drop.

[0055] It should be further noted that the environmental sensitivity coefficient in this invention... The system is responsible for establishing a dynamic compensation mechanism for environmental temperature drift in the decision logic, and its empirical value range is as follows: to This parameter is determined by performing linear regression analysis on the environmental response sequence of the gas-insulated switchgear under no-load conditions, extracting its environmental follow-up slope. Specifically, third-order differencing is performed on the observed environmental temperature values ​​to obtain higher-order fluctuation characteristics, and the least squares method is used to fit the synchronous correlation between the environmental temperature and the temperature of the gas-insulated switchgear casing, thereby calculating the proportional coefficient reflecting the intensity of external disturbances' interference with the internal thermal field; the preset disturbance observation window duration... Get experience points Second.

[0056] For example, Figure 3 This is a schematic diagram illustrating the changes in the comprehensive judgment index for thermal equilibrium. The diagram shows the changes in the convection stability factor and the equilibrium judgment index over time. In the later stages of the test, the value of the convection stability factor rapidly converged to a low level, indicating that the thermal field coupling of the insulating gas inside the equipment had become consistent. At the same time, after integral compensation for ambient temperature drift, the equilibrium judgment index effectively eliminated the influence of ambient temperature fluctuations, and its value gradually decreased and eventually fell below the preset thermal equilibrium judgment threshold, accurately indicating the time point when the gas-insulated switchgear reached thermal equilibrium, thereby triggering physical closed-loop control.

[0057] S5. Determine the thermal balance state of the gas-insulated switchgear based on the balance judgment index and the convection stability factor, and execute physical closed-loop control based on the thermal balance state.

[0058] It should be noted that after obtaining the equilibrium judgment index that reflects the actual evolution trend of the thermal field, the system needs to automatically execute the shutdown operation according to the preset thermal equilibrium criterion to replace manual monitoring and realize the fully automated process of temperature rise test. This can not only improve the test efficiency, but also ensure that the test data is locked at the best time.

[0059] Specifically, the present invention will acquire the balance determination index in real time. With the preset thermal balance determination threshold Comparisons were made, and the convection stability factor was also considered. The values ​​are used to make a comprehensive judgment.

[0060] Furthermore, the present invention sets a thermal balance determination threshold. When the balance judgment index Less than the thermal balance threshold And convection stability factor Below 0.001 Furthermore, if the duration exceeds 10 minutes, the present invention determines that the gas-insulated switchgear has reached thermal equilibrium.

[0061] Furthermore, after determining that thermal balance has been achieved, the present invention sends a current cut-off command to the high current generator through the controller and adjusts the internal voltage regulator of the high current generator to zero, locking the current temperature observation value of the measuring point as the final factory test report data, thereby realizing the physical closed-loop control of an automatic test method for the factory temperature rise test of a gas-insulated switchgear.

[0062] This invention also discloses an automatic testing system for factory temperature rise testing of gas-insulated switchgear, including a processor and a memory. The memory stores computer program instructions, and when the computer program instructions are executed by the processor, an automatic testing method for factory temperature rise testing of gas-insulated switchgear according to the present invention is implemented.

[0063] The system also includes other components well known to those skilled in the art, such as communication buses and communication interfaces, the settings and functions of which are known in the art and will not be described in detail here.

Claims

1. An automatic testing method for the factory temperature rise test of a gas-insulated switchgear, characterized in that, include: The original temperature sequence of the measuring point and the original ambient temperature sequence of the gas-insulated switchgear are obtained and smoothed to obtain the temperature observation sequence of the measuring point and the ambient temperature observation sequence. The rate of temperature rise evolution is obtained based on the temperature observations at the measurement points in the measurement point temperature observation sequence and the environmental temperature observations in the environmental temperature observation sequence. The convection stability factor is obtained based on the temperature rise evolution rate, the temperature observations at the measuring points in the temperature observation sequence, and the ambient temperature observations in the ambient temperature observation sequence. The equilibrium determination index is obtained based on the temperature rise evolution rate, the environmental temperature observation value in the environmental temperature observation value sequence, and the preset disturbance observation window duration. The thermal balance state of the gas-insulated switchgear is determined based on the balance judgment index and the convection stability factor, and physical closed-loop control is executed based on the thermal balance state.

2. The automatic testing method for the factory temperature rise test of an inflatable switchgear according to claim 1, characterized in that, The acquisition of the temperature rise evolution rate includes: ； In the formula, for The rate of temperature evolution at any given time, for Temperature observations at the measuring points at any given time. for The ambient temperature observation value at that time. This is the heat dissipation damping coefficient. It is an exponential function. This is the differential symbol.

3. The automatic testing method for the factory temperature rise test of an inflatable switchgear according to claim 2, characterized in that, The heat dissipation damping coefficient is obtained as follows: By performing least squares fitting on the temperature rise data from the previous complete maintenance cycle, the attenuation curvature in the quasi-equilibrium section is extracted to determine the value of the heat dissipation damping coefficient.

4. The automatic testing method for the factory temperature rise test of an inflatable switchgear according to claim 1, characterized in that, The convection stationarity factor satisfies the expression: ； In the formula, for The convection stationary factor at time, for Temperature observations at the measuring points at any given time. for The ambient temperature observation value at that time. for The rate of temperature evolution at any given time, For the convective response coefficient, The symbol for the natural logarithm. It is the absolute value symbol. This is the differential symbol.

5. The automatic testing method for the factory temperature rise test of an inflatable switchgear according to claim 4, characterized in that, The convective response coefficient is obtained as follows: The convective response coefficient was determined by performing second-order difference calculations on the temperature rise curve during the first 15 minutes of the test start-up phase and using the ratio of the peak value to the predicted steady-state temperature rise.

6. The automatic testing method for the factory temperature rise test of an inflatable switchgear according to claim 1, characterized in that, The balance determination index satisfies the expression: ； In the formula, express Indicators for determining balance at any given moment; This indicates the preset duration of the disturbance observation window; This represents any time within the disturbance observation window; Indicates the environmental sensitivity coefficient; express The rate of temperature rise evolution at any given time; Indicates the time variable of integration; Indicates in The ambient temperature observation value at that moment; This represents the maximum value operation; Represents the differential symbol.

7. The automatic testing method for the factory temperature rise test of an inflatable switchgear according to claim 6, characterized in that, The environmental sensitivity coefficient is obtained as follows: The environmental temperature observation values ​​were subjected to third-order difference to obtain higher-order fluctuation characteristics, and the environmental sensitivity coefficient was determined by fitting the synchronous correlation between the environmental temperature observation values ​​and the temperature of the gas-insulated switchgear enclosure using the least squares method.

8. The automatic testing method for the factory temperature rise test of an inflatable switchgear according to claim 1, characterized in that, The determination of the thermal balance state of the gas-insulated switchgear includes: The balance judgment index is compared with the preset thermal balance judgment threshold. If the balance judgment index is less than the thermal balance judgment threshold and the convection stability factor is lower than the preset convection stability threshold, and the duration exceeds the preset time threshold, it is determined that the gas-insulated switchgear has achieved thermal balance.

9. The automatic testing method for the factory temperature rise test of an inflatable switchgear according to claim 8, characterized in that, The physical closed-loop control based on thermal equilibrium includes: In response to the determination that the gas-insulated switchgear has reached thermal equilibrium, a current cut-off command is sent to the high-current generator and the internal voltage regulator of the high-current generator is adjusted to zero, locking the current temperature observation value at the measuring point as the final factory test report data.

10. An automatic testing system for factory temperature rise testing of gas-insulated switchgear, characterized in that, include: The processor and memory, wherein the memory stores computer program instructions, which, when executed by the processor, implement an automatic testing method for the factory temperature rise test of an inflatable switchgear according to any one of claims 1-9.

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