A high voltage cable termination tail pipe pressure control method, system, device, and medium

Abstract

The application discloses a high-voltage cable terminal tail pipe pressure control method, system, equipment and medium, and relates to the technical field of high-voltage cable terminals. The method comprises the following steps: inputting environmental temperature data and load current data of a first period into a multi-physical field model coupled with a temperature field and a stress field to obtain first interface pressure of the first period; generating a first heating power sequence from the first interface pressure; performing time-period heating on the cable terminal tail pipe according to the first heating power sequence; collecting first temperature distribution data of the cable terminal tail pipe, inputting the first temperature distribution data into a thermal coupling state equation to obtain second interface pressure; obtaining a second heating power coefficient corresponding to a deviation value of the second interface pressure and an initial pressure value according to a preset mapping relationship; and adjusting the first heating power sequence according to the second heating power coefficient to realize interface pressure control of the cable terminal tail pipe. The method improves the reliability of high-voltage cable terminal operation in an extremely low-temperature environment.

Description

Technical Field

[0001] This invention relates to the field of high-voltage cable termination technology, and in particular to a method, system, equipment and medium for controlling the pressure of the tailpipe of a high-voltage cable termination. Background Technology

[0002] In long-distance power transmission, high-voltage cables are the core component for power delivery. High-voltage cable terminals, as critical nodes connecting cable lines to transformers, switches, and other equipment, are often weak points in the system due to their complex structure, diverse materials, and numerous interfaces. Under extreme low-temperature environments, cable terminals face severe challenges. When temperatures drop suddenly, the different materials inside the terminal shrink unevenly due to differences in their coefficients of thermal expansion, leading to a decrease in interfacial pressure. This can potentially trigger partial discharge, insulation breakdown, or even explosion, seriously threatening power grid safety.

[0003] To alleviate the aforementioned problems, existing technologies often employ the installation of heating blankets on the outside of cable terminals to mitigate the effects of low temperatures through external heating or insulation. While this method can increase the surface temperature of the terminal and reduce heat dissipation to some extent, thus partially alleviating the decrease in interfacial pressure, it still has significant shortcomings: Firstly, the heating mechanism of the heating blankets is unclear, and the relationship between their heating characteristics and the internal interfacial pressure of the terminal lacks systematic research, making it difficult to ensure that the pressure remains stable within a safe range. Secondly, the heating power settings often rely on experience or simple temperature control, failing to fully consider dynamic changes in ambient temperature, load fluctuations, and the thermo-coupling characteristics of materials, resulting in a lagging control strategy. Under extreme low-temperature conditions in northern winters, existing methods struggle to achieve real-time control of interfacial pressure and cannot effectively prevent insulation failures.

[0004] Therefore, there is an urgent need to develop a method for controlling the interface pressure of high-voltage cable terminals to solve the problems of unclear mechanisms, insufficient accuracy and response lag in existing technologies, and to improve the operational reliability and safety of cable terminals in extreme low-temperature environments. Summary of the Invention

[0005] This invention provides a method, system, equipment, and medium for controlling the pressure of a high-voltage cable terminal tailpipe. It can insulate the high-voltage cable terminal, stabilize the interface pressure of the high-voltage cable terminal, and predict and control the interface pressure in advance, effectively solving the lag of existing operation and maintenance strategies.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a method for controlling the pressure of a high-voltage cable terminal tailpipe, the method comprising:

[0008] The ambient temperature data and load current data of the first time period are obtained, and the ambient temperature data and load current data of the first time period are input into the multiphysics field model that couples the temperature field and stress field to obtain the first interface pressure of the first time period.

[0009] A first heating power sequence is generated based on the first interface pressure in the first time period;

[0010] The cable terminal tailpipe is heated in stages according to the first heating power sequence;

[0011] After time-segmented heating, the first temperature distribution data of the cable terminal tailpipe is collected, and the first temperature distribution data is input into the thermo-coupling state equation to obtain the second interface pressure.

[0012] Calculate the deviation difference between the second interface pressure and the initial pressure value, and obtain the second heating power coefficient corresponding to the deviation difference between the second interface pressure and the initial pressure value according to the preset mapping relationship between the deviation difference and the heating power coefficient;

[0013] The first heating power sequence is adjusted according to the second heating power coefficient to obtain the second heating power sequence;

[0014] The cable terminal tail tube is heated in stages according to the second heating power sequence to achieve interface pressure control of the cable terminal tail tube.

[0015] In some possible implementations, generating the first heating power sequence based on the first interface pressure during the first time period includes:

[0016] The interface pressure trajectory is obtained based on the first interface pressure in the first time period;

[0017] A first heating power sequence is generated based on the interface pressure trajectory.

[0018] In some possible implementations, generating the first heating power sequence based on the interface pressure trajectory includes:

[0019] Based on the difference between the interface pressure trajectory and the target interface pressure, an optimization algorithm is used to generate the heating power value corresponding to each time slice in the first time period, and a first heating power sequence is generated based on the heating power value corresponding to each time slice in the first time period.

[0020] In some possible implementations, adjusting the first heating power sequence according to the second heating power coefficient to obtain the second heating power sequence includes:

[0021] Each power value in the first heating power sequence is multiplied by the second heating power coefficient to obtain the adjusted second heating power sequence.

[0022] In some possible implementations, the method further includes:

[0023] Based on the thermal conductivity, coefficient of thermal expansion, elastic modulus and Poisson's ratio parameters of various materials in the cable terminal, a multiphysics model coupling temperature field and stress field is constructed.

[0024] In some possible implementations, before acquiring the ambient temperature data and load current data for the first time period, the method further includes:

[0025] Acquire the initial ambient temperature data and the initial load current data for the first time period;

[0026] Data filtering and outlier removal are performed on the initial ambient temperature data and initial load current data of the first time period to obtain the ambient temperature data and load current data of the first time period.

[0027] Secondly, the present invention provides a high-voltage cable terminal tailpipe pressure control system, the system comprising:

[0028] The calculation module is used to acquire the ambient temperature data and load current data of the first time period, and input the ambient temperature data and load current data of the first time period into the multiphysics field model that couples the temperature field and stress field to obtain the first interface pressure of the first time period.

[0029] The heating module is used to generate a first heating power sequence based on the first interface pressure in the first time period; and to heat the cable terminal tail pipe in time periods according to the first heating power sequence.

[0030] The adjustment module is used to collect the first temperature distribution data of the cable terminal tailpipe after time-segmented heating, input the first temperature distribution data into the thermo-coupling state equation to obtain the second interface pressure; calculate the deviation difference between the second interface pressure and the initial pressure value, and obtain the second heating power coefficient corresponding to the deviation difference between the second interface pressure and the initial pressure value according to the preset mapping relationship between the deviation difference and the heating power coefficient.

[0031] The control module is used to adjust the first heating power sequence according to the second heating power coefficient to obtain the second heating power sequence;

[0032] The cable terminal tail tube is heated in stages according to the second heating power sequence to achieve interface pressure control of the cable terminal tail tube.

[0033] Thirdly, the present invention provides a computing device, including a memory and a processor;

[0034] The memory stores one or more computer programs, the one or more computer programs including instructions; when the instructions are executed by the processor, the computing device performs the method as described in any one of the first aspects.

[0035] Fourthly, the present invention provides a computer-readable storage medium for storing a computer program for performing the method as described in any one of the first aspects.

[0036] Fifthly, the present invention provides a computer program product comprising one or more computer instructions, wherein when the computer instructions are executed by a computer, the computer performs the method as described in any one of the first aspects.

[0037] As can be seen from the above technical solution, the present invention has at least the following beneficial effects:

[0038] In this invention, ambient temperature data and load current data for a first time period are acquired and input into a multiphysics model coupling a temperature field and a stress field to obtain the first interface pressure for the first time period. A first heating power sequence is generated based on the first interface pressure for the first time period. The cable terminal tail pipe is heated in time periods according to the first heating power sequence. First temperature distribution data of the cable terminal tail pipe is collected and input into a thermo-coupling state equation to obtain the second interface pressure. The deviation difference between the second interface pressure and the initial pressure value is calculated. A second heating power coefficient corresponding to the deviation difference between the second interface pressure and the initial pressure value is obtained according to a preset mapping relationship between the deviation difference and the heating power coefficient. The first heating power sequence is adjusted according to the second heating power coefficient to achieve interface pressure control of the cable terminal tail pipe.

[0039] In existing technologies, heating blankets are often used to maintain the temperature of cable terminals. However, the heating mechanism of heating blankets and their effectiveness in increasing the interface pressure of the terminal's internal structure are unclear, and there is insufficient experimental basis for setting the heating power. This makes it impossible to achieve real-time and intelligent control of the cable terminal tailpipe temperature, resulting in lag in interface pressure control. This makes it difficult to cope with the problem of sudden drops in interface pressure under extreme low temperatures, which can easily lead to cable terminal discharge, breakdown, or even explosion accidents. Therefore, this invention constructs a multi-physics field model that couples the temperature field and stress field. Combining meteorological forecast data and load current data in the first time period, it uses a genetic algorithm to generate the optimal heating power sequence. At the same time, it collects the temperature data of the cable terminal to correct the interface pressure in real time. This allows for the prediction of interface pressure change trends in advance and the dynamic adjustment of heating power, keeping the interface pressure stable near the initial pressure. This effectively solves the problems of lag and insufficient control accuracy in existing technologies. Furthermore, in extreme low-temperature environments, by setting the weight coefficients in the objective function, it minimizes heating energy consumption while ensuring interface pressure stability, thus balancing control effect and economy.

[0040] It should be understood that the descriptions of technical features, technical solutions, beneficial effects, or similar language in this invention do not imply that all features and advantages can be achieved in any single embodiment. Rather, it is understood that the description of a feature or beneficial effect means that a specific technical feature, technical solution, or beneficial effect is included in at least one embodiment. Therefore, the descriptions of technical features, technical solutions, or beneficial effects in this specification do not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions, and beneficial effects described in this embodiment can be combined in any suitable manner. Those skilled in the art will understand that embodiments can be implemented without one or more specific technical features, technical solutions, or beneficial effects of a particular embodiment. In other embodiments, additional technical features and beneficial effects may be identified in specific embodiments that do not embody all embodiments. Attached Figure Description

[0041] Figure 1 A flowchart of a high-voltage cable terminal tailpipe pressure control method provided in an embodiment of the present invention;

[0042] Figure 2 A schematic diagram of a high-voltage cable terminal heating device and its wrapping method under extreme low temperature conditions provided by an embodiment of the present invention;

[0043] Figure 3 A schematic diagram of the arrangement site of a pressure sensor at the insulation interface of a cable terminal provided in an embodiment of the present invention;

[0044] Figure 4 A temperature change curve simulating an extreme environment is provided as an embodiment of the present invention;

[0045] Figure 5A modified heating power sequence curve is provided for an embodiment of the present invention;

[0046] Figure 6 A graph showing the change rate of interface pressure over time, provided as an embodiment of the present invention;

[0047] Figure 7 A schematic diagram of a high-voltage cable terminal tailpipe pressure control system provided in an embodiment of the present invention;

[0048] Figure 8 This is a schematic diagram of a computing device provided in an embodiment of the present invention. Detailed Implementation

[0049] The terms "first," "second," and "third," etc., used in this specification and description of the drawings are used to distinguish different objects, rather than to limit a specific order.

[0050] In embodiments of the present invention, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in embodiments of the present invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0051] To ensure clarity and conciseness in the description of the following embodiments, a brief introduction to the related technologies is given first:

[0052] High-voltage cables, as core components for long-distance power transmission, play a crucial role in power systems. High-voltage cable terminals are typically installed at the beginning and end of cable lines to connect with transformers, switchgear, and other electrical equipment, serving as key nodes in the power transmission process where electrical energy is transferred from the cable to other devices. However, due to the complex structure of cable terminals, integrating various materials and multiple interfaces between them, they often become the weakest link in the entire power cable system.

[0053] The underlying cause is that the interfacial pressure of the multiple layers of materials inside the cable terminal decreases in cold environments, making the interface prone to discharge and even breakdown. Excessively low temperatures reduce the elasticity of the materials, making them more rigid and unable to maintain interfacial contact pressure through elastic deformation. Furthermore, the differences in the coefficients of thermal expansion of different materials—for example, the coefficients of thermal expansion of metals and insulating materials often differ significantly—lead to relative displacement due to varying degrees of expansion and contraction during temperature changes. This disrupts the original tight contact at the interface, greatly affecting the stability of the insulation. The good insulation performance originally achieved through tight contact is significantly reduced due to the appearance of interfacial gaps, causing distortion of the electric field at the interface and triggering discharge. When the discharge develops to a certain extent, it leads to a breakdown accident.

[0054] Currently, maintenance units mainly use heating blankets to reduce heat loss from cable terminals and maintain their internal temperature. However, the heating mechanism of these blankets—how they affect the cable terminal temperature through their own heating or insulation properties, and their effectiveness in increasing the interface pressure within the terminal's internal structure—remains unclear. For example, whether the heating power of the blankets is sufficient, and whether the heat can be effectively transferred to critical parts of the cable terminal to increase interface pressure, are questions that lack in-depth research and clear conclusions. Therefore, there is an urgent need to explore new insulation measures that can effectively increase the internal temperature and interface pressure of cable terminals, improve the operational safety of high-voltage cable terminals in low-temperature environments, and ensure reliable power supply to the power system under extreme low-temperature conditions.

[0055] Existing research indicates that the temperature rise of the cable terminal tailpipe directly affects the increase in interface pressure within the terminal's internal structure. However, current interface pressure suppression measures do not consider this critical issue and cannot achieve real-time, intelligent control of the cable terminal tailpipe temperature. Therefore, based on the correlation between tailpipe temperature, internal interface pressure of the cable terminal, and ambient temperature, a method for suppressing the decrease in interface pressure at high-voltage cable terminals needs to be proposed to improve the operational reliability of high-voltage cable terminals under extreme low-temperature environments.

[0056] In view of this, embodiments of the present invention provide a method for controlling the pressure of a high-voltage cable terminal tailpipe. This method involves acquiring ambient temperature data and load current data for a first time period, inputting these data into a multiphysics model coupling a temperature field and a stress field to obtain a first interface pressure for that time period; generating a first heating power sequence based on the first interface pressure; heating the cable terminal tailpipe in time periods according to the first heating power sequence; collecting first temperature distribution data of the cable terminal tailpipe, inputting this data into a thermo-coupling state equation to obtain a second interface pressure; calculating the deviation between the second interface pressure and the initial pressure value, obtaining a second heating power coefficient corresponding to the deviation between the second interface pressure and the initial pressure value based on a preset mapping relationship between the deviation difference and the heating power coefficient; and adjusting the first heating power sequence according to the second heating power coefficient to achieve interface pressure control of the cable terminal tailpipe.

[0057] As can be seen, this invention constructs a multiphysics model coupling temperature and stress fields, combines meteorological forecast data and load current data from the first time period, and uses a genetic algorithm to generate the optimal heating power sequence. Simultaneously, it collects temperature data from the cable terminal to correct the interface pressure in real time. This allows for the prediction of interface pressure changes in advance, enabling dynamic adjustment of heating power and keeping the interface pressure stable near the initial pressure. This effectively solves the problems of lag and insufficient control precision in existing technologies, improves the reliability and safety of high-voltage cable terminal operation under extreme low-temperature environments, and minimizes heating energy consumption while ensuring interface pressure stability, thus balancing control effectiveness and economy.

[0058] To make the technical solution of the present invention clearer and easier to understand, the following description, in conjunction with the accompanying drawings, introduces a high-voltage cable terminal tailpipe pressure control method provided by an embodiment of the present invention. Figure 1 As shown, this figure is a flowchart of a high-voltage cable terminal tailpipe pressure control method provided by an embodiment of the present invention. This method is applied to processing equipment, and the high-voltage cable terminal tailpipe pressure control method includes:

[0059] S101, The processing device acquires the ambient temperature data and the load current data for the first time period.

[0060] The processing equipment first acquires the initial ambient temperature data and the initial load current data for the first time period. This first time period can be flexibly determined based on actual monitoring needs and the operating characteristics of the cable terminal. For example, in extreme low-temperature weather, to better cope with rapid temperature changes, it can be set to the next hour; while in relatively stable temperature periods, to reduce data processing volume, it can be set to the next two hours, etc. In this invention, extreme low-temperature weather is defined as an ambient temperature ≤ -20℃, and relatively stable temperature means a temperature fluctuation ≤ 5℃ within one hour. The initial ambient temperature data is acquired in real time using high-precision temperature sensors deployed around the cable terminal. These temperature sensors have good low-temperature adaptability and can operate stably in extreme low-temperature environments, capturing subtle changes in ambient temperature. The initial load current data is acquired using a professional current monitoring device on the cable line. This device can continuously and accurately monitor the real-time changes in current within the cable.

[0061] Next, the processing equipment performs data filtering and outlier removal on the acquired initial ambient temperature data and initial load current data for the first time period. Data filtering can employ common filtering algorithms, such as the Kalman filter, which can optimally estimate the collected data based on the temperature and current variation patterns, effectively eliminating random noise interference and making the data smoother and more accurate. Alternatively, moving average filtering can be used, averaging the data within a certain window to filter out short-term fluctuation noise. Outlier removal is achieved by setting reasonable threshold ranges. Technicians will pre-set upper and lower thresholds for the data based on the ambient temperature and load current range of the cable terminal under normal operating conditions, combined with the special circumstances of extreme low-temperature environments. When the collected data points exceed this threshold range, they are identified as outliers and removed from the dataset.

[0062] After preprocessing, the ambient temperature data and load current data for the first time period are obtained. By filtering and removing outliers from the initial ambient temperature and load current data, the quality and reliability of the data can be effectively improved. This provides accurate basic data support for subsequent temperature and stress field coupling analysis based on these data, thereby enabling control of the cable terminal interface pressure. It avoids control strategy deviations caused by data errors, helps improve the accuracy and stability of high-voltage cable terminal tailpipe pressure control, and ensures the reliable operation of the cable terminal.

[0063] S102. The processing device inputs the ambient temperature data and load current data of the first time period into the multiphysics model that couples the temperature field and stress field to obtain the first interface pressure of the first time period.

[0064] The processing equipment constructs a multiphysics model coupling the temperature and stress fields based on the thermal conductivity, coefficient of thermal expansion, elastic modulus, and Poisson's ratio parameters of various materials used in the cable terminal. This model employs thermo-mechanical coupled state equations, which can simultaneously describe the interaction between temperature and stress distributions, specifically including the heat conduction control equations and boundary continuity equations, stress-strain constitutive equations, and the coupling relationship between them.

[0065] Taking a cable terminal comprising: a first material, a second material, ..., an nth material as an example. In the temperature field, the cable terminal as a whole satisfies the heat conduction control equation and the boundary continuity equation, as shown in formula (1):

[0066] Formula (1);

[0067] in, For vector differential operators, Let i be the temperature field within the i-th material; Let be the thermal conductivity of the i-th material. The thermal conductivity of the first material; As a heat source, it is generated when a current-carrying conductor is passed through it, T 1j T is the boundary temperature of the first material. 2j T is the boundary temperature of the second material. nj Let be the boundary temperature of the nth material, d1 be the normal vector perpendicular to the interface between the first material and the adjacent material, pointing towards the first material, and d2 be the normal vector perpendicular to the interface between the second material and the adjacent material, pointing towards the second material. n Let i be the normal vector perpendicular to the interface between the nth material and the adjacent material, pointing towards the nth material. Both i and n are positive integers, equal to the total number of material types contained in the cable terminal, and i is less than or equal to n.

[0068] The heat source in the cable terminal is the heat generated when current flows through the conductor, as shown in formula (2):

[0069] Formula (2);

[0070] in, For cable current carrying capacity, The resistance of the conductor, for a given cable, can be determined based on the resistivity of the copper conductor and the cable length. For a conductor carrying alternating current, the resistance caused by the skin effect is calculated using the following formula:

[0071] Formula (3);

[0072] in, The angular frequency of alternating current; ρ is the permeability of the copper conductor; Let be the electrical conductivity of the copper conductor.

[0073] The part that is in direct contact with the air will emit thermal radiation, which satisfies the thermal radiation equation, as shown in formula (4):

[0074] Formula (4);

[0075] in, Let l be the radiative heat flux density, l be the surface emissivity, and h be the Stefan-Boltzmann constant. For the boundary temperature of materials in contact with air, since the materials of the terminal shell, flange, and tailpipe have thermal radiation effects, it is only necessary to list the thermal radiation equations for the materials of the shell, flange, and tailpipe. The ambient temperature.

[0076] In the stress field, based on the solved temperature field, the temperature at various locations on the cable terminal can be obtained, and then the interface pressure can be calculated. Specifically, this includes:

[0077] For the three-dimensional axisymmetric problem of cable termination, the following stress-strain constitutive equation can be listed, as shown in equation (5):

[0078] Formula (5);

[0079] in, For radial strain, For circumferential strain, For axial strain. This is the radial pressure, i.e., the pressure at the first interface. For circumferential pressure, For axial pressure, Poisson's ratio, This is the elastic modulus of the material.

[0080] Furthermore, for plane axisymmetric problems, the equilibrium equation and geometric equation are also satisfied. This equation represents the balance between stress divergence and body force under static equilibrium, as shown in formula (6):

[0081] Formula (6);

[0082] Where u is the displacement and r is the length in the radial direction.

[0083] The cable termination is installed with an interference fit, so the initial loads at the interface between cross-linked polyethylene and silicone rubber, and between silicone rubber and epoxy are both set to 0.2 MPa. The initial boundary conditions are as shown in formula (7):

[0084] Formula (7);

[0085] in, This represents the initial load at the interface between cross-linked polyethylene and silicone rubber. This represents the initial load at the interface between the silicone rubber and the epoxy resin.

[0086] In addition, all objects on Earth are affected by a gravitational field G, which is taken as g = 9.8.

[0087] Through the above steps, multi-physics coupling is performed. The thermal expansion process affects the stress change. Therefore, a new thermal expansion component is added to the formula (5), as shown in formula (8):

[0088] Formula (8);

[0089] in, The radial strain is caused by thermal expansion. The strain is caused by thermal expansion in the circumferential direction. This represents the axial strain caused by thermal expansion. Let be the coefficient of thermal expansion of the i-th material. For reference temperature or initial temperature, Let be the temperature field within the i-th material.

[0090] Changes in the temperature field can affect the stress field through thermal strain. That is, changes in temperature can cause materials to expand or contract thermally, thereby generating thermal stress. Changes in the stress field can also affect the temperature field. For example, material deformation caused by stress may change thermal parameters such as thermal conductivity. However, in many engineering problems, the reverse effect of stress on the temperature field is relatively weak and can often be simplified according to the actual situation.

[0091] In the context of cable terminations, the temperature field primarily influences the stress field through thermal strain, thus achieving coupling between the temperature and stress fields. By solving this coupled model, the temperature and stress distributions of the cable termination under specific ambient temperatures and load currents can be obtained simultaneously, allowing for the calculation of key mechanical quantities such as interfacial pressure.

[0092] After completing the multiphysics model construction, the processing device inputs the acquired ambient temperature data and load current data for the first time period into the multiphysics model. The ambient temperature data reflects the temperature changes of the external environment where the cable terminal is located. In extreme low-temperature environments, fluctuations in this data may affect the temperature distribution inside the cable terminal. The load current data is directly related to the heating situation inside the cable. When current passes through the cable conductor, it generates Joule heating, which is an important heat source factor affecting the temperature field of the cable terminal.

[0093] During the model calculation process, based on the heat conduction equation, thermal convection boundary conditions, and the thermal properties of the material, combined with the input ambient temperature and load current data, the temperature field distribution of the cable terminal during the first time period is first calculated. For example, considering that the heat dissipation conditions are different at different parts of the cable terminal, corresponding convective heat transfer coefficients are set in the model to accurately simulate the process of heat loss from the cable terminal to the surrounding environment.

[0094] Then, based on the calculated temperature field distribution, and combined with the material's mechanical parameters, the stress field distribution caused by temperature changes and the material's own mechanical properties is calculated using the mechanical equilibrium equation and thermoelasticity theory, thus obtaining the first interfacial pressure for the first time period. During the calculation, the differences in thermal expansion of different materials under temperature changes, and the interaction forces generated at the interface by these differences, are fully considered, as these factors enable accurate calculation of the interfacial pressure.

[0095] A multiphysics model, constructed based on the thermal and mechanical parameters of various materials in the cable terminal, can reflect the influence of changes in ambient temperature and load current on the temperature and stress fields of the cable terminal. The heat conduction governing equation and the boundary continuity equation ensure accurate simulation of heat transfer between different materials; the heat source formula can calculate the heat generated by the current; and the thermal radiation equation considers the heat loss in the part in contact with the air.

[0096] By inputting ambient temperature and load current data into a multiphysics model coupling temperature and stress fields, the influence of multiple factors on the interface pressure of cable terminals can be comprehensively considered. Compared with traditional single-factor analysis or empirical estimation methods, this significantly improves the accuracy and reliability of interface pressure calculation. This lays a solid foundation for generating a reasonable heating power sequence based on accurate interface pressure data, thereby controlling the interface pressure of the cable terminal tailpipe. It also helps improve the stability and safety of high-voltage cable terminals in extreme low-temperature environments, reducing the risk of faults such as discharge and breakdown caused by abnormal interface pressure.

[0097] S103. The processing equipment generates a first heating power sequence based on the first interface pressure in the first time period.

[0098] The interface pressure trajectory is determined based on the first interface pressure during the first time period. The interface pressure trajectory visually demonstrates the dynamic changes in interface pressure over time during the first time period. This trajectory is the core basis for generating the subsequent heating power sequence, pointing the way for the generation of the subsequent power sequence and ensuring that the power sequence can be designed to take into account the changing trend of interface pressure.

[0099] Next, a first heating power sequence is generated based on the interface pressure trajectory. Since there is a difference between the interface pressure trajectory and the target interface pressure, in order to effectively adjust the interface pressure during subsequent heating, an optimization algorithm is needed to determine the heating power value corresponding to each time slice within the first time period, and then the first heating power sequence is generated based on the heating power values ​​corresponding to each time slice within the first time period. Specifically, this includes:

[0100] To keep the predicted interface pressure σ(t) trajectory as close as possible to the initial pressure while minimizing heating energy consumption, a genetic algorithm is used to generate a heating power sequence. The genetic algorithm is chosen as the optimization algorithm because it has good global search capabilities and can find optimal solutions in complex solution spaces. The objective function expression is formula (9):

[0101] Formula (9);

[0102] in, The objective function value is M, and the number of time slices is M. To predict interface pressure, As the initial pressure, This is the heating power value. As the first weighting coefficient, This is the second weighting coefficient.

[0103] In this embodiment of the invention, the future control period (2 hours) is divided into M time slices (M=12, each slice is 10 minutes long), and each individual is represented as an M-dimensional power sequence vector [P1,P2,P3,...,P...]. M ], where P m Let m be the heating power value for the m-th time slice, where m = 1, 2, 3, ..., M. The range of values ​​is limited by the power of the heating device. Based on experiments on the heat resistance and heating efficiency of the cable terminal tail pipe material, the power of the heating device can be set from 0 to 500W.

[0104] For each power sequence, the new heat source (Q2=P) applied at the tailpipe is predicted using a multiphysics coupled simulation model. m Given the new heat source intensity (Q2), calculate the interface pressure trajectory σ(t) over the next N time slices and the fitness value: fitness = 1 / (F+ε), where F is the objective function value and ε is a minimum constant. A higher fitness indicates that the power sequence is closer to the optimal solution.

[0105] Then, a roulette wheel selection method is used to select parent individuals based on their fitness ratio, ensuring that high-fitness individuals have a higher probability of passing on their traits to the next generation. A single-point crossover operation is performed on the selected parent individuals with a probability of 0.8, for example, swapping the power values ​​of two individuals at the third time slice to generate new offspring. A mutation is then performed on a specific power value of an individual with a probability of 0.1, such as adjusting P... m Variation within ±10%.

[0106] In one embodiment, the number of iterations is set to 50 generations. After each generation, the fitness is recalculated after updating the population, until the fitness converges or the maximum number of iterations is reached. Finally, the individual with the highest fitness is selected as the optimal heating power sequence. The control cycle of the genetic algorithm is set to 10 minutes, meaning that after executing the power for one time slice, the interface pressure trajectory for the next N time slices is recalculated to ensure the accuracy of the control target.

[0107] The generation of the first heating power sequence through the above steps has several beneficial effects. First, optimization using a genetic algorithm can effectively reduce heating energy consumption while meeting interface pressure control requirements, achieving a balance between control effectiveness and energy utilization efficiency. Second, dividing the control cycle into multiple time slices and recalculating the interface pressure trajectory after each power slice allows for timely responses to various changes in actual conditions, improving the accuracy and flexibility of control. Furthermore, prediction based on a multi-physics coupled simulation model considers the interactions between multiple physical fields, making the prediction results more accurate and providing a reliable basis for the generation of the heating power sequence. This ensures the effectiveness of high-voltage cable terminal tailpipe pressure control under extreme low temperatures, improving the reliability and stability of high-voltage cable terminals operating in extreme low-temperature environments.

[0108] S104. The processing equipment heats the cable terminal tail pipe in stages according to the first heating power sequence.

[0109] The processing equipment heats the cable terminal tailpipe in time segments according to a first heating power sequence. Specifically, the first heating power sequence consists of heating power values ​​for multiple time slots, each corresponding to a specific duration. In the relevant embodiment, each time slot lasts for 10 minutes. The processing equipment controls the heating device to heat the cable terminal tailpipe at that power during the corresponding time period according to the power value of each time slot in the sequence. During the heating process, the processing equipment also monitors the operating status of the heating device in real time, such as the actual output value of the heating power and the temperature of the heating device, to ensure that the heating device can operate accurately according to the requirements of the first heating power sequence.

[0110] This approach avoids the energy waste that can result from continuous constant-power heating, which might provide excessive heat even when the interface pressure doesn't require additional heat, leading to unnecessary energy consumption. It also prevents insufficient heating, where the constant power cannot provide enough heat in time to maintain the interface pressure, thus affecting the operational reliability of the cable terminal. This lays a solid foundation for subsequent stable control of the interface pressure.

[0111] Time-segmented heating can match the heat demand of cable terminal tailpipes at different times under extreme low temperatures, achieving efficient utilization of heating energy and avoiding energy waste. At the same time, through power control, it effectively responds to the dynamic changes in interface pressure over time, ensuring the stability of the cable terminal interface pressure under extreme low temperature environments. This greatly improves the reliability of high-voltage cable terminals operating under extreme low temperature environments and reduces the risk of faults such as discharge and breakdown caused by unstable interface pressure.

[0112] S105. The processing equipment collects the first temperature distribution data of the cable terminal tailpipe, inputs the first temperature distribution data into the thermo-coupling state equation, and obtains the second interface pressure.

[0113] The processing equipment collects the initial temperature distribution data of the cable terminal tailpipe, typically achieved through multiple temperature sensors arranged along the tailpipe's axial direction. These temperature sensors monitor the temperature at different locations on the tailpipe in real time, thus obtaining the tailpipe's temperature distribution data. Furthermore, the collected tailpipe temperature data is used to perform real-time corrections to the interface stress model. This involves setting temperature sensors to monitor the tailpipe temperature during the heating process, adding tailpipe temperature boundary conditions to the model, and recalculating the interface pressure to meet the required standards. ,in, This is the boundary temperature (surface temperature) of the tailpipe. Data is collected by the temperature sensor.

[0114] Then, the first temperature distribution data is input into the thermo-coupling state equation in step S102. The thermo-coupling state equation comprehensively considers the interaction between the temperature field and the stress field. Based on the thermal and mechanical parameters of the material, it establishes a mathematical relationship between the temperature distribution and the interfacial pressure. By solving this equation, the processing device can obtain the second interfacial pressure. The solution process has been described in detail in S102 and will not be repeated here. This step realizes the conversion from temperature monitoring to interfacial pressure calculation, providing data support for subsequent pressure adjustment. If the corrected interfacial pressure deviates significantly from the initial pressure, the heating power of the current time slot can be adjusted according to the degree of deviation. For example, if it is 10% lower than the initial pressure, the heating power is adjusted to 1.1P. m .

[0115] S106. The processing equipment calculates the deviation difference between the second interface pressure and the initial pressure value, and obtains the second heating power coefficient corresponding to the deviation difference between the second interface pressure and the initial pressure value according to the preset mapping relationship between the deviation difference and the heating power coefficient.

[0116] The processing equipment first calculates the deviation between the second interface pressure and the initial pressure value. The initial pressure value is the target pressure that the interface should maintain under normal operating conditions of the cable terminal; it is a key indicator to ensure the stable operation of the cable terminal. For example, in this invention, the initial loads of the cross-linked polyethylene-silicone rubber interface and the silicone rubber-epoxy interface are both set to 0.2 MPa. This value was determined through extensive theoretical research and experimental verification, ensuring that the cable terminal maintains good performance under normal operating conditions. The deviation clearly reflects the difference between the current interface pressure and the target pressure, serving as an important basis for determining whether the heating power needs to be adjusted and the adjustment range.

[0117] Next, the processing equipment acquires a preset mapping relationship between the deviation difference and the heating power coefficient. This mapping relationship is used to determine the second heating power coefficient corresponding to the deviation difference between the second interface pressure and the initial pressure value. This mapping relationship is predetermined through extensive experimental and simulation data. During the experiments, technicians simulate different extreme low-temperature environments and varying interface pressures, conducting heating tests on the cable terminal tailpipe and recording the optimal heating power adjustment coefficient corresponding to various deviation differences. Simultaneously, advanced simulation software is used to construct a multiphysics model of the cable terminal, conducting numerous numerical simulations to further optimize and refine this mapping relationship.

[0118] Specifically, when the deviation is small, the corresponding heating power coefficient may be close to 1, indicating that the current heating power is basically appropriate and does not require significant adjustment. Only minor adjustments or maintaining the current power are needed. This ensures that the interface pressure approaches the initial pressure value while avoiding unnecessary energy consumption and unstable equipment operation caused by frequent and significant power adjustments. When the deviation is large, the heating power coefficient will increase or decrease accordingly to clearly indicate the degree to which the heating power needs to be increased or decreased.

[0119] For example, if the deviation is -10% of the initial pressure value, meaning the current interface pressure is 10% lower than the initial pressure value, the corresponding heating power coefficient might be 1.2 according to the mapping relationship. This means that the current heating power needs to be increased by 20% to quickly raise the tailpipe temperature and increase the interface pressure, bringing it closer to the initial pressure value. If the deviation is +10% of the initial pressure value, meaning the current interface pressure is 10% higher than the initial pressure value, the corresponding heating power coefficient might be 0.8, meaning the heating power needs to be reduced by 20% to prevent excessive interface pressure from damaging the cable terminal structure. Through this mapping relationship, the heating power can be scientifically and efficiently adjusted.

[0120] S107. The processing equipment adjusts the first heating power sequence according to the second heating power coefficient to achieve interface pressure control of the cable terminal tail pipe.

[0121] The processing device adjusts the first heating power sequence according to the second heating power coefficient to obtain the second heating power sequence; each power value in the first heating power sequence is multiplied by the second heating power coefficient to obtain the adjusted second heating power sequence.

[0122] The cable terminal tail tube is heated in stages according to the second heating power sequence to achieve interface pressure control of the cable terminal tail tube.

[0123] The processing equipment adjusts the first heating power sequence according to the second heating power coefficient. Specifically, each power value in the first heating power sequence is multiplied by the second heating power coefficient to obtain the adjusted second heating power sequence. For example, if the heating power value of a certain time slot in the first heating power sequence is P1, and the second heating power coefficient is k, then the adjusted power value for that time slot is P1. k. Subsequently, the processing equipment heats the cable terminal tailpipe in stages according to the second heating power sequence.

[0124] This adjustment allows for dynamic modification of the heating power based on the actual monitored interface pressure. Because the thermal and mechanical properties of cable terminals change over time in extreme low-temperature environments, the initially generated heating power sequence may not be adequate for all situations. Introducing a second heating power coefficient ensures a higher degree of matching between the heating power and the tailpipe. For example, when the interface pressure is significantly lower than the initial pressure, the second heating power coefficient will be greater than 1, thereby increasing the heating power, accelerating the temperature rise of the tailpipe, and promoting a recovery in interface pressure. When the interface pressure approaches the initial pressure, the second heating power coefficient approaches 1, maintaining a suitable heating power and keeping the interface pressure stable. This enables effective control of the interface pressure in the cable terminal tailpipe, ensuring it remains stable near the initial pressure even in extreme low-temperature environments, thus guaranteeing the reliable operation of the cable terminal.

[0125] Based on the above method, a smart control device for the pressure at the high-voltage cable terminal interface under extreme low temperatures is provided, such as... Figure 2 As shown, the device includes:

[0126] Heating blanket 1 is used to tightly wrap the tailpipes of the three-phase terminals (including phases A, B, and C). It is made of a special material with good flexibility and thermal conductivity, which can fully adhere to the surface of the tailpipes to ensure efficient heat transfer. After receiving the power sequence heating signal from the controller, the heating blanket can generate heat according to the power parameters in the signal, thereby heating the cable terminals, raising the tailpipe temperature, and providing a thermal basis for maintaining stable interface pressure.

[0127] Tail tube 2, as a key component of the cable termination, serves as the transition between the cable body and other electrical equipment. Its internal structure is complex and integrates interfaces of various materials. Temperature changes in the tail tube directly affect the interfacial pressure within the termination's internal structure, making it the core carrier of heat transfer and pressure variations. In extremely low-temperature environments, temperature fluctuations in the tail tube cause thermal expansion and contraction of surrounding materials, thereby altering the contact state and pressure distribution between interfaces.

[0128] Temperature sensors 3: Each heating blanket is equipped with three temperature sensors, which are evenly attached axially to the terminal tailpipe, enabling comprehensive and detailed monitoring of the temperature at different locations within the tailpipe. The sensors feature high accuracy and rapid response, used to record tailpipe temperature distribution data in real time and transmit it to the controller. Based on this data and the calculation results from the multiphysics coupling modeling module, the controller can correct the heating power, ensuring the accuracy of the heating process and maintaining the tailpipe temperature within a range conducive to stable interface pressure.

[0129] Multiphysics coupling modeling module 4, based on the thermal and mechanical parameters of various materials in the cable terminal, uses numerical simulation algorithms to construct a multiphysics model coupling the temperature and stress fields. This module can simulate and calculate the temperature distribution and interface pressure of the cable terminal under different operating conditions, providing theoretical basis and data support for the controller to generate heating power sequences.

[0130] Controller 5, as the core control unit of the device, possesses powerful computing and processing capabilities. It receives the calculation results from the multiphysics coupling simulation module and can be programmed with various intelligent control algorithms. Through analysis of the input data and algorithmic calculations, the controller can generate a power sequence heating signal and output it to the heating blanket, achieving intelligent control of the heating process.

[0131] Communication module 6 employs stable and reliable communication protocols, such as CAN bus and Ethernet, to establish an efficient communication connection between the multiphysics coupling modeling module 4 and the controller 5. Communication module 6 consists of two communication interfaces, one built into the multiphysics coupling modeling module 4 and the other into the controller 5, connected via an external communication cable. It enables real-time transmission of tailpipe temperature distribution data and interface pressure trajectory calculation results, ensuring that the controller 5 can promptly obtain the latest model calculation information, thereby quickly adjusting the control strategy and guaranteeing the dynamic response capability of the entire device to extreme low-temperature environments.

[0132] Figure 2 The multiple bidirectional arcs between the two communication modules (6 icons) are a schematic representation that vividly illustrates the stable, high-speed, bidirectional data flow between them, ensuring the real-time transmission of model calculation information and control commands.

[0133] Accurate monitoring of the pressure at the cable terminal insulation interface is a prerequisite for effective interface pressure control. For example... Figure 3 As shown, Figure 3 This is a schematic diagram illustrating the arrangement of a pressure sensor at the insulation interface of a cable terminal, as provided in an embodiment of the present invention. As can be seen in the figure, Figure 3 The locations of the pressure sensors at the cable terminal insulation interface are marked. Pressure sensors are strategically placed at several critical locations that are highly sensitive to interface pressure, such as the cable body / stress cone interface.

[0134] These pressure sensors can measure the interface pressure at their location in real time and accurately. The acquired pressure data is transmitted to the processing equipment in real time, providing the most direct and crucial data source for subsequent processing equipment to calculate the interface pressure, analyze the pressure change trend over time, and make corresponding control decisions.

[0135] When studying the impact of extreme low-temperature environments on high-voltage cable terminals and developing targeted interface pressure control strategies, simulating temperature changes under extreme conditions is an important preliminary step. Figure 4 This simulation result is presented. The graph uses time (in hours) as the horizontal axis and ambient temperature (in degrees Celsius) as the vertical axis to depict the dynamic trend of temperature change over time during the simulation of an extreme low-temperature environment.

[0136] The curves clearly illustrate the rapid temperature drop to extreme low temperatures and the potential fluctuations within these extreme low-temperature ranges. This simulated temperature data provides crucial reference for in-depth research into the impact of extreme low temperatures on cable terminal performance. Based on these different temperature variation scenarios, and considering the material properties and structural characteristics of the cable terminals, engineers can thoroughly analyze the coupling relationship between the internal temperature and stress fields. This provides solid data support and a theoretical foundation for further optimizing interface pressure control strategies to better adapt to extreme low-temperature environments.

[0137] Adjusting the heating power is one of the core operations for achieving stable control of the interface pressure of the cable terminal tailpipe. Figure 5 This graph illustrates the changes in the heating power sequence after a series of complex calculations and adjustments. Using time (in minutes) on the horizontal axis and heating power (in W) on the vertical axis, it visually presents the heating power values ​​corresponding to different time segments. These power values ​​are not fixed but are the result of multiple corrections made to the initially generated heating power sequence by the processing equipment, based on real-time monitored interface pressure data and a preset mapping relationship between deviation and heating power coefficient.

[0138] By observing this curve, one can intuitively and clearly understand how the heating system dynamically and flexibly adjusts the heating power according to the actual changes in interface pressure over different time periods. This not only demonstrates the responsiveness of the entire intelligent control system to changes in interface pressure but also reflects the dynamic process of heating power adjustment. It provides strong visual evidence for controlling the interface pressure of the cable terminal tailpipe, helping technicians to deeply understand and optimize heating power control strategies.

[0139] The actual control effect on the pressure at the cable terminal interface after a series of operations by the intelligent control system is a key indicator for evaluating the success of the entire technical solution. Figure 6 This experimental result is presented. The graph, with time (in hours) on the horizontal axis and the rate of change of interface pressure (in %) on the vertical axis, clearly shows the actual change data of the cable terminal interface pressure over time after adopting the intelligent control method of this invention.

[0140] The effectiveness of the intelligent control system in controlling interface pressure can be intuitively judged from the curve trend. If the curve shows that the interface pressure is stable near the initial pressure with minimal fluctuations, it fully demonstrates that the intelligent control method can effectively maintain the stability of the interface pressure and achieve the expected control objective. Conversely, if the curve shows that the interface pressure fluctuates greatly or deviates significantly from the initial pressure value, then these data will provide direction for further optimization of the control strategy and prompt technicians to make targeted improvements to the system.

[0141] therefore, Figure 6 The measured data presented are key data for verifying the effectiveness of the entire interface pressure control technology solution, and provide the most direct and crucial basis for evaluating and improving the technical solution of this invention.

[0142] Based on the above, the ambient temperature data and load current data for the first time period are acquired. These data are then input into a multiphysics model coupling the temperature and stress fields to obtain the first interface pressure for the first time period. A first heating power sequence is generated based on the first interface pressure. The cable terminal tailpipe is heated in stages according to the first heating power sequence. The first temperature distribution data of the cable terminal tailpipe is collected and input into the thermo-coupling state equation to obtain the second interface pressure. The deviation between the second interface pressure and the initial pressure value is calculated. Based on the preset mapping relationship between the deviation difference and the heating power coefficient, the second heating power coefficient corresponding to the deviation between the second interface pressure and the initial pressure value is obtained. The first heating power sequence is adjusted according to the second heating power coefficient to achieve interface pressure control of the cable terminal tailpipe.

[0143] As can be seen, this invention constructs a multiphysics model coupling temperature and stress fields, combines meteorological forecast data and load current data from the first time period, and uses a genetic algorithm to generate the optimal heating power sequence. Simultaneously, it collects temperature data from the cable terminal to correct the interface pressure in real time. This allows for the prediction of interface pressure changes in advance, enabling dynamic adjustment of heating power and keeping the interface pressure stable near the initial pressure. This effectively solves the problems of lag and insufficient control precision in existing technologies, improves the reliability and safety of high-voltage cable terminal operation under extreme low-temperature environments, and minimizes heating energy consumption while ensuring interface pressure stability, thus balancing control effectiveness and economy.

[0144] The above text combined Figures 1 to 6 The high-voltage cable terminal tailpipe pressure control method provided in the embodiments of the present invention has been described in detail. The system and equipment provided in the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0145] This invention also provides a high-voltage cable terminal tailpipe pressure control system, such as... Figure 7 As shown in the figure, this is a schematic diagram of a high-voltage cable terminal tailpipe pressure control system provided in an embodiment of the present invention. The system includes:

[0146] The calculation module 701 is used to acquire the ambient temperature data and the load current data of the first time period, and input the ambient temperature data and the load current data of the first time period into the multiphysics field model that couples the temperature field and the stress field to obtain the first interface pressure of the first time period.

[0147] Heating module 702 is used to generate a first heating power sequence based on the first interface pressure in the first time period; and to heat the cable terminal tail pipe in time periods according to the first heating power sequence.

[0148] The adjustment module 703 is used to collect the first temperature distribution data of the cable terminal tail pipe after time-segmented heating, input the first temperature distribution data into the thermo-coupling state equation to obtain the second interface pressure; calculate the deviation difference between the second interface pressure and the initial pressure value, and obtain the second heating power coefficient corresponding to the deviation difference between the second interface pressure and the initial pressure value according to the preset mapping relationship between the deviation difference and the heating power coefficient.

[0149] The control module 704 is used to adjust the first heating power sequence according to the second heating power coefficient to obtain the second heating power sequence;

[0150] The cable terminal tail tube is heated in stages according to the second heating power sequence to achieve interface pressure control of the cable terminal tail tube.

[0151] In some possible implementations, the heating module 702 is specifically used to obtain an interface pressure trajectory based on the first interface pressure in the first time period; and to generate a first heating power sequence based on the interface pressure trajectory.

[0152] In some possible implementations, the heating module 702 is specifically used to generate heating power values ​​corresponding to each time slice within a first time period based on the difference between the interface pressure trajectory and the target interface pressure through an optimization algorithm, and to generate a first heating power sequence based on the heating power values ​​corresponding to each time slice within the first time period.

[0153] In some possible implementations, the control module 704 is specifically configured to multiply each power value in the first heating power sequence by the second heating power coefficient to obtain an adjusted second heating power sequence.

[0154] In some possible implementations, the system further includes:

[0155] The module is used to construct a multiphysics model that couples the temperature field and the stress field based on the thermal conductivity, coefficient of thermal expansion, elastic modulus and Poisson's ratio parameters of each material in the cable terminal.

[0156] In some possible implementations, the system further includes:

[0157] The acquisition module is used to acquire the initial ambient temperature data and the initial load current data of the first time period; and to perform data filtering and outlier removal on the initial ambient temperature data and the initial load current data of the first time period to obtain the ambient temperature data and the load current data of the first time period.

[0158] The high-voltage cable terminal tailpipe pressure control system according to embodiments of the present invention can correspond to the execution of the method described in the embodiments of the present invention, and the other operations and / or functions of each module / unit of the high-voltage cable terminal tailpipe pressure control system are respectively for implementing Figure 1 For the sake of brevity, the corresponding processes of each method in the illustrated embodiments will not be described in detail here.

[0159] This invention also provides a computing device. For example... Figure 8 As shown in the figure, this is a schematic diagram of a computing device provided in an embodiment of the present invention. The computing device 400 includes a bus 401, a processor 402, a communication interface 403, and a memory 404. The processor 402, the memory 404, and the communication interface 403 communicate with each other via the bus 401.

[0160] Bus 401 can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of representation, Figure 8 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0161] Processor 402 can be any one or more of the following processors: central processing unit (CPU), graphics processing unit (GPU), microprocessor (MP), or digital signal processor (DSP).

[0162] Communication interface 403 is used for communication with external devices.

[0163] Memory 404 may include volatile memory, such as random access memory (RAM). Memory 404 may also include non-volatile memory, such as read-only memory (ROM), flash memory, hard disk drive (HDD), or solid state drive (SSD).

[0164] The memory 404 stores executable code, and the processor 402 executes the executable code to perform the aforementioned high-voltage cable terminal tailpipe pressure control method.

[0165] Specifically, in achieving Figure 7 In the case of the illustrated embodiment, and Figure 7 In the case where the modules or units of the high-voltage cable terminal tailpipe pressure control system described in the embodiment are implemented through software, the execution... Figure 7 The software or program code required for the functions of each module / unit can be partially or entirely stored in memory 404. Processor 402 executes the program code corresponding to each unit stored in memory 404 to execute the aforementioned high-voltage cable terminal tailpipe pressure control method.

[0166] This invention also provides a computer-readable storage medium. The computer-readable storage medium can be any available medium that a computing device can store, or a data storage device such as a data center containing one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state drive). The computer-readable storage medium includes instructions that instruct the computing device to execute the aforementioned high-voltage cable terminal tailpipe pressure control method.

[0167] This invention also provides a computer program product comprising one or more computer instructions. When the computer instructions are loaded and executed on a computing device, all or part of the processes or functions described in this invention are generated.

[0168] The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from one website, computer, or data center to another website, computer, or data center via wired (e.g., coaxial cable, fiber optic) or wireless (e.g., infrared, wireless, microwave, etc.) means.

[0169] When the computer program product is executed by a computer, the computer performs any of the aforementioned methods of the high-voltage cable terminal tailpipe pressure control method. The computer program product can be a software installation package; when any of the aforementioned methods of the high-voltage cable terminal tailpipe pressure control method is required, the computer program product can be downloaded and executed on the computer.

[0170] The descriptions of the processes or structures corresponding to the above figures each have their own emphasis. For parts of a process or structure that are not described in detail, please refer to the relevant descriptions of other processes or structures.

[0171] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for controlling the pressure of a high-voltage cable terminal tailpipe, characterized in that, The method includes: The ambient temperature data and load current data of the first time period are obtained, and the ambient temperature data and load current data of the first time period are input into the multiphysics field model that couples the temperature field and stress field to obtain the first interface pressure of the first time period. A first heating power sequence is generated based on the first interface pressure in the first time period; The cable terminal tailpipe is heated in stages according to the first heating power sequence; After time-segmented heating, the first temperature distribution data of the cable terminal tailpipe is collected, and the first temperature distribution data is input into the thermo-coupling state equation to obtain the second interface pressure. Calculate the deviation difference between the second interface pressure and the initial pressure value, and obtain the second heating power coefficient corresponding to the deviation difference between the second interface pressure and the initial pressure value according to the preset mapping relationship between the deviation difference and the heating power coefficient; The first heating power sequence is adjusted according to the second heating power coefficient to obtain the second heating power sequence; The cable terminal tail tube is heated in stages according to the second heating power sequence to achieve interface pressure control of the cable terminal tail tube.

2. The method according to claim 1, characterized in that, The step of generating the first heating power sequence based on the first interface pressure in the first time period includes: The interface pressure trajectory is obtained based on the first interface pressure in the first time period; A first heating power sequence is generated based on the interface pressure trajectory.

3. The method according to claim 2, characterized in that, The step of generating the first heating power sequence based on the interface pressure trajectory includes: Based on the difference between the interface pressure trajectory and the target interface pressure, an optimization algorithm is used to generate the heating power value corresponding to each time slice in the first time period, and a first heating power sequence is generated based on the heating power value corresponding to each time slice in the first time period.

4. The method according to claim 1, characterized in that, The step of adjusting the first heating power sequence according to the second heating power coefficient to obtain the second heating power sequence includes: Each power value in the first heating power sequence is multiplied by the second heating power coefficient to obtain the adjusted second heating power sequence.

5. The method according to claim 1, characterized in that, The method further includes: Based on the thermal conductivity, coefficient of thermal expansion, elastic modulus and Poisson's ratio parameters of various materials in the cable terminal, a multiphysics model coupling temperature field and stress field is constructed.

6. The method according to claim 1, characterized in that, Before acquiring the ambient temperature data and load current data for the first time period, the method further includes: Acquire the initial ambient temperature data and the initial load current data for the first time period; Data filtering and outlier removal are performed on the initial ambient temperature data and initial load current data of the first time period to obtain the ambient temperature data and load current data of the first time period.

7. A pressure control system for a high-voltage cable terminal tailpipe, characterized in that, The system includes: The calculation module is used to acquire the ambient temperature data and load current data of the first time period, and input the ambient temperature data and load current data of the first time period into the multiphysics field model that couples the temperature field and stress field to obtain the first interface pressure of the first time period. The heating module is used to generate a first heating power sequence based on the first interface pressure in the first time period; and to heat the cable terminal tail pipe in time periods according to the first heating power sequence. The adjustment module is used to collect the first temperature distribution data of the cable terminal tailpipe after time-segmented heating, input the first temperature distribution data into the thermo-coupling state equation to obtain the second interface pressure; calculate the deviation difference between the second interface pressure and the initial pressure value, and obtain the second heating power coefficient corresponding to the deviation difference between the second interface pressure and the initial pressure value according to the preset mapping relationship between the deviation difference and the heating power coefficient. The control module is used to adjust the first heating power sequence according to the second heating power coefficient to obtain the second heating power sequence; and to perform time-segmented heating of the cable terminal tail pipe according to the second heating power sequence to achieve interface pressure control of the cable terminal tail pipe.

8. The system according to claim 7, characterized in that, The heating module is specifically used to obtain the interface pressure trajectory based on the first interface pressure in the first time period. A first heating power sequence is generated based on the interface pressure trajectory.

9. A computing device, characterized in that, Including memory and processor; The memory stores one or more computer programs, the one or more computer programs including instructions; when the instructions are executed by the processor, the computing device performs the method as described in any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium is used to store a computer program for performing the method as described in any one of claims 1 to 6.

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