Simulation method and system for the relationship between insulation eccentricity and electrical performance of high-voltage AC cables

Abstract

The present invention discloses a simulation method and system for the relationship between insulation eccentricity and electrical performance of a high-voltage AC cable, and relates to the technical field of cable simulation. The method and system obtain a model irreducible coefficient by calculating an operating environment instability coefficient, an aging coefficient, a damage coefficient and an operating frequency influence coefficient of the high-voltage AC cable, and compares the model irreducible coefficient with a preset model irreducible coefficient threshold. The method and system can determine whether the geometric model of the high-voltage AC cable can be simplified based on the comparison result, and can determine whether the geometric model of the high-voltage AC cable can be simplified based on actual conditions, thereby ensuring the accuracy of the simulation results, making the evaluation of the electrical performance of the cable accurate, and truly reflecting the performance of the cable under actual working conditions, reducing the risk of cable failure, and ensuring the safety and reliability of the electrical system.

Description

Technical Field

[0001] The present invention relates to the technical field of cable simulation, and in particular to a method and system for simulating the relationship between insulation eccentricity and electrical performance of a high-voltage AC cable. Background Art

[0002] The simulation method of the relationship between the insulation eccentricity and electrical performance of high-voltage AC cables usually refers to the study of the influence of the eccentricity of the cable insulation layer on its electrical properties (such as electric field distribution, dielectric strength, discharge characteristics, insulation withstand voltage, etc.) through computer modeling and numerical simulation. Eccentricity refers to the degree to which the cable insulation layer deviates from the center position in the axial direction. This asymmetry will cause uneven distribution of the electric field inside the cable, thereby affecting the electrical performance of the cable. By using simulation techniques such as finite element analysis (FEA), researchers can simulate the electric field distribution of the cable under different working conditions, observe the electric field strength and local electric field skin effect of the insulating material, and then evaluate the influence of eccentricity on the insulation performance of the cable. Through these simulation methods, we can deeply understand the electrical properties of the insulating material, optimize the cable design, and ensure its safety and reliability in high-voltage working environments. At the same time, the simulation results can provide cable manufacturers with more accurate design parameters, help reduce the occurrence of cable failures, and improve the stability of the electrical system;

[0003] In the electrical performance analysis of cables, the precise geometric model may contain complex hierarchical structures and details, such as different insulation layers, metal conductors, shielding layers, etc. These details may bring a lot of calculations in the simulation, resulting in too long calculation time. By simplifying the model, some non-critical parts can be removed or complex details can be replaced with idealized structures to achieve the goal of balancing accuracy and efficiency. The benefit of simplifying the geometric model is that it can significantly reduce the consumption of computing resources and speed up the simulation process while still obtaining sufficiently accurate results. Especially when optimizing the design or evaluating the main electrical performance parameters, this simplification can effectively save time and cost.

[0004] However, not all geometric models of high-voltage AC cables can be simplified. Blindly simplifying the geometric models of high-voltage AC cables may lead to inaccurate simulation results, thereby affecting the evaluation of the electrical performance of the cables. Such inaccurate simulation results may not truly reflect the performance of the cables under actual working conditions, increasing the risk of cable failures and thus affecting the safety and reliability of the electrical system. Summary of the invention

[0005] The purpose of the present invention is to solve the above-mentioned problems and to provide a method and system for simulating the relationship between the insulation eccentricity and electrical performance of a high-voltage AC cable.

[0006] In a first aspect of the present invention, a method for simulating the relationship between insulation eccentricity and electrical performance of a high-voltage AC cable is first proposed. The method comprises:

[0007] Acquire the operating environment data of the high-voltage AC cable, and calculate the operating environment instability coefficient of the high-voltage AC cable according to the operating environment data;

[0008] Obtaining the service time of the high-voltage AC cable in operation, and calculating the aging coefficient of the high-voltage AC cable according to the service time;

[0009] Acquire an image of a high-voltage AC cable, and analyze the image to calculate a damage factor of the high-voltage AC cable;

[0010] Obtaining the operating frequency of the high-voltage AC cable during operation, and calculating the operating frequency influence coefficient of the high-voltage AC cable according to the operating frequency;

[0011] The model irreducible coefficient is obtained according to the operating environment instability coefficient, aging coefficient, damage coefficient and operating frequency influence coefficient of the high-voltage AC cable, and the model irreducible coefficient is compared with the preset model irreducible coefficient threshold. According to the comparison result, it is judged whether the geometric model of the high-voltage AC cable can be simplified.

[0012] Optionally, calculating the operating environment instability coefficient of the high-voltage AC cable according to the operating environment data includes:

[0013] Obtaining the operating environment data type of the high-voltage AC cable, and obtaining the actual data value of each type of data, to obtain a sequence of actual data values ​​based on time sequence;

[0014] The actual data value sequence in the actual data value sequence is labeled as , represents the sequence number of the actual data value sequence in the actual data value sequence, =1, 2, 3, 4, ..., , is the total number of actual data value sequences in the actual data value sequence, and is a positive integer;

[0015] Calculate the mean of the actual data value sequence. The calculation formula is:

[0016] Calculate the operating environment instability coefficient of the high-voltage AC cable using the following formula: ;in, is the operating environment instability coefficient of the high voltage AC cable, It is the sequence number of the operating environment data type of the high voltage AC cable. is the total number of operating environment data types for high voltage AC cables, and Is a positive integer.

[0017] Optionally, calculating the aging coefficient of the high-voltage AC cable according to the use time includes: obtaining the use time of the high-voltage AC cable in operation and the preset maximum usable time, and obtaining the service life consumption coefficient by using the use time of operation and the preset maximum usable time; obtaining the average maintenance time interval during the operation of the high-voltage AC cable, obtaining the time interval from the current time to the last maintenance, dividing the time interval from the current time to the last maintenance by the average maintenance time interval to obtain the maintenance coefficient; calculating the aging coefficient of the high-voltage AC cable according to the service life consumption coefficient and the maintenance coefficient, the calculation formula is: ;

[0018] In the formula, is the aging coefficient of the high voltage AC cable, and are the service life consumption coefficient and the maintenance coefficient, respectively. They are and The preset scaling factor of The scores are greater than 0.

[0019] Optionally, analyzing the image to calculate the damage factor of the high-voltage AC cable includes:

[0020] Acquire a high-resolution image of a high-voltage AC cable, and process the acquired high-resolution image;

[0021] For the processed high-resolution image of the high-voltage AC cable, multiple defect regions on the cable surface are extracted using image processing technology, and the area of ​​each defect region is calculated;

[0022] Calculate the total area of ​​multiple defective areas on the cable surface, obtain the total surface area of ​​the cable, and calculate the damage factor of the high-voltage AC cable. The calculation formula is: , where is the damage factor of the high voltage AC cable, Indicates the cable surface The area of ​​the defect region, Indicates the order number of the defect area on the cable surface. =1, 2, 3, 4, ..., , is the total number of defective areas on the cable surface, and is a positive integer; Represents the total surface area of ​​the cable.

[0023] Optionally, calculating the operating frequency influence coefficient of the high-voltage AC cable according to the operating frequency includes:

[0024] Get the average operating frequency when the high voltage AC cable is running , and obtain the electric field strength of the high-voltage AC cable at the average operating frequency and the electric field strength of the high voltage AC cable at the preset reference low frequency operating frequency , calculate the frequency response factor , the calculation formula is: ;

[0025] Get the total length of the high voltage AC cable , calculate the electromagnetic field complexity coefficient , the calculation formula is: , where Indicates the position along the cable length, Indicates the magnetic field strength at position The rate of change of magnetic field strength with respect to position The derivative of The electric field strength at position The rate of change of the electric field strength with respect to position The derivative of

[0026] Calculate the operating frequency influence coefficient of high voltage AC cables , the calculation formula is: .

[0027] Optionally, the irreducible coefficients of the model obtained according to the operating environment instability coefficient, aging coefficient, damage coefficient and operating frequency influence coefficient of the high-voltage AC cable include:

[0028] ;

[0029] In the formula, is the irreducible coefficient of the model, , 、 、 They are the operating environment instability coefficient, aging coefficient, damage coefficient and operating frequency influence coefficient. 、 、 、 They are , 、 、 The preset scaling factor of 、 、 、 Both are greater than 0.

[0030] Optionally, comparing the model irreducible coefficient with a preset model irreducible coefficient threshold, and judging whether the geometric model of the high-voltage AC cable can be simplified according to the comparison result includes:

[0031] The model irreducible coefficient is compared with the preset model irreducible coefficient threshold. If the model irreducible coefficient is greater than or equal to the preset model irreducible coefficient threshold, it means that the geometric model of the high-voltage AC cable cannot be simplified, and the relationship between the insulation eccentricity and the electrical performance of the high-voltage AC cable needs to be simulated based on the unsimplified geometric model of the high-voltage AC cable.

[0032] If the model unsimplifiable coefficient is less than the preset model unsimplifiable coefficient threshold, it means that the geometric model of the high-voltage AC cable can be simplified, and the relationship between the insulation eccentricity and electrical performance of the high-voltage AC cable can be simulated based on the simplified geometric model of the high-voltage AC cable.

[0033] In a second aspect of the present invention, a simulation system for the relationship between insulation eccentricity and electrical performance of a high-voltage AC cable is provided, the system comprising:

[0034] Environmental instability module: obtains the operating environment data of the high-voltage AC cable, and calculates the operating environment instability coefficient of the high-voltage AC cable based on the operating environment data;

[0035] Aging module: obtains the use time of the high-voltage AC cable in operation, and calculates the aging coefficient of the high-voltage AC cable according to the use time;

[0036] Damage module: obtains the image of the high-voltage AC cable, analyzes the image and calculates the damage coefficient of the high-voltage AC cable;

[0037] Working frequency influence module: obtains the working frequency of the high-voltage AC cable during operation, and calculates the working frequency influence coefficient of the high-voltage AC cable according to the working frequency;

[0038] Judgment module: obtain the model irreducible coefficient according to the operating environment instability coefficient, aging coefficient, damage coefficient and operating frequency influence coefficient of the high-voltage AC cable, compare the model irreducible coefficient with the preset model irreducible coefficient threshold, and judge whether the geometric model of the high-voltage AC cable can be simplified based on the comparison results.

[0039] Beneficial effects of the present invention:

[0040] The present invention proposes a simulation method and system for the relationship between the insulation eccentricity and electrical performance of a high-voltage AC cable, by obtaining the operating environment data of the high-voltage AC cable to calculate the operating environment instability coefficient; obtaining the operating time of the high-voltage AC cable to calculate the aging coefficient; obtaining the image of the high-voltage AC cable to calculate the damage coefficient of the high-voltage AC cable; obtaining the operating frequency of the high-voltage AC cable during operation to calculate the operating frequency influence coefficient; obtaining the model irreducible coefficient according to the operating environment instability coefficient, aging coefficient, damage coefficient and operating frequency influence coefficient, and comparing the model irreducible coefficient with a preset model irreducible coefficient threshold, and judging whether the geometric model of the high-voltage AC cable can be simplified according to the comparison result, in this way, it is possible to judge whether the geometric model of the high-voltage AC cable can be simplified according to the actual situation, thereby ensuring the accuracy of the simulation results, making the evaluation of the electrical performance of the cable accurate, and truly reflecting the performance of the cable under actual working conditions, reducing the risk of cable failure, and ensuring the safety and reliability of the electrical system. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A flow chart of a simulation method for the relationship between insulation eccentricity and electrical performance of a high-voltage AC cable;

[0042] Figure 2 The framework diagram of the simulation system for the relationship between insulation eccentricity and electrical performance of high-voltage AC cables. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0045] The embodiment of the present invention provides a method for simulating the relationship between insulation eccentricity and electrical performance of a high-voltage AC cable. Figure 1 , Figure 1 A flow chart of a method for simulating the relationship between insulation eccentricity and electrical performance of a high-voltage AC cable provided in an embodiment of the present invention. The method comprises the following steps:

[0046] Acquire the operating environment data of the high-voltage AC cable, and calculate the operating environment instability coefficient of the high-voltage AC cable according to the operating environment data;

[0047] Obtaining the service time of the high-voltage AC cable in operation, and calculating the aging coefficient of the high-voltage AC cable according to the service time;

[0048] Acquire an image of a high-voltage AC cable, and analyze the image to calculate a damage factor of the high-voltage AC cable;

[0049] Obtaining the operating frequency of the high-voltage AC cable during operation, and calculating the operating frequency influence coefficient of the high-voltage AC cable according to the operating frequency;

[0050] The model irreducible coefficient is obtained according to the operating environment instability coefficient, aging coefficient, damage coefficient and operating frequency influence coefficient of the high-voltage AC cable, and the model irreducible coefficient is compared with the preset model irreducible coefficient threshold. According to the comparison result, it is judged whether the geometric model of the high-voltage AC cable can be simplified.

[0051] Based on the simulation method for the relationship between the insulation eccentricity and electrical performance of a high-voltage AC cable provided in an embodiment of the present invention, through the above-mentioned method, it is possible to judge whether the geometric model of the high-voltage AC cable can be simplified according to the actual situation, thereby ensuring the accuracy of the simulation results, making the evaluation of the electrical performance of the cable accurate, and being able to truly reflect the performance of the cable under actual working conditions, reducing the risk of cable failure, and ensuring the safety and reliability of the electrical system.

[0052] In one embodiment, obtaining the operating environment data of the high-voltage AC cable and calculating the operating environment instability coefficient of the high-voltage AC cable according to the operating environment data includes:

[0053] Obtaining the operating environment data type of the high-voltage AC cable, and obtaining the actual data value of each type of data, to obtain a sequence of actual data values ​​based on time sequence;

[0054] The actual data value sequence in the actual data value sequence is labeled as , represents the sequence number of the actual data value sequence in the actual data value sequence, =1, 2, 3, 4, ..., , is the total number of actual data value sequences in the actual data value sequence, and is a positive integer;

[0055] Calculate the mean of the actual data value sequence. The calculation formula is:

[0056] Calculate the operating environment instability coefficient of the high-voltage AC cable using the following formula: ;in, is the operating environment instability coefficient of the high voltage AC cable, It is the sequence number of the operating environment data type of the high voltage AC cable. is the total number of operating environment data types for high voltage AC cables, and is a positive integer;

[0057] It should be noted that the operating environment data types of high-voltage AC cables include temperature, humidity, vibration, air pressure, electromagnetic interference, soil moisture, etc. Specifically, temperature and humidity are usually obtained in real time through environmental monitoring equipment (such as temperature and humidity sensors), which can be installed in the cable laying area or the environment around the cable. Vibration data can be obtained through vibration sensors, especially in industrial environments, where cables may be exposed to mechanical vibration and dynamic loads generated by equipment operation; air pressure data can be obtained through air pressure sensors, especially in cable operating environments at high altitudes or special climatic conditions; electromagnetic interference (EMI) is usually monitored through electromagnetic field strength sensors to determine whether the cable is interfered by external electromagnetic sources. Soil moisture can be measured through soil moisture sensors or other underground sensing devices, especially underground cables need to monitor changes in the underground environment. These environmental data can be collected and transmitted in real time through wireless sensor networks, data acquisition systems or intelligent monitoring systems to form a time series-based data set for subsequent analysis and evaluation.

[0058] It should be noted that the greater the instability coefficient of the operating environment of the high-voltage AC cable, the less the geometric model of the high-voltage AC cable can be simplified in the simulation of the relationship between the insulation eccentricity and electrical performance of the high-voltage AC cable, because the greater the instability coefficient of the operating environment of the high-voltage AC cable, the greater the impact of external changes in the environment where the cable is located (such as temperature fluctuations, humidity changes, vibrations, air pressure, etc.) on the working state and performance of the cable. In this environment, the operating state of the cable is more uncertain and complex, especially the electrical properties of the cable, such as electric field distribution, insulation state and heat distribution, will be significantly affected by environmental factors. Therefore, in the simulation process, if the geometric model of the cable is simplified, the complex effects of these environmental factors on the cable performance may be ignored, resulting in a large deviation between the simulation results and the actual situation. Specifically, the simplification of the geometric model may not fully capture the expansion or contraction effects of the insulating material due to temperature changes, or the changes in the cable insulation performance due to changes in soil moisture. These factors may directly affect the electric field distribution and heat flow distribution, thereby affecting the long-term reliability and safety of the cable. Therefore, in the case of a large environmental instability coefficient, a more accurate geometric model must be retained to ensure that the simulation can truly reflect the electrical performance of the cable in a complex environment.

[0059] In the implementation method, the benefits of analyzing the operating environment instability coefficient of the high-voltage AC cable for judging whether the geometric model of the high-voltage AC cable can be simplified in the simulation of the relationship between the insulation eccentricity and the electrical performance of the high-voltage AC cable are:

[0060] By understanding the instability of environmental factors, it is possible to more accurately evaluate the errors that may be caused by simplifying the geometric model, thereby avoiding ignoring the impact of environmental changes on electrical performance due to model simplification. Specifically, when the environmental instability coefficient is large, the complexity of the environmental impact on cable performance changes can be identified, ensuring that the simulation model can fully consider these impacts and avoid misjudgments caused by over-simplification. When the environmental instability coefficient is small, it indicates that the environment in which the cable is located is relatively stable. At this time, the geometric model can be appropriately simplified to reduce the complexity of the simulation calculation and improve the simulation efficiency without affecting the accuracy of the results. In addition, clarifying the impact of the environmental instability coefficient will help provide a more scientific basis for the design and operation optimization of the cable, and ensure the safety and reliability of high-voltage AC cables in complex operating environments.

[0061] In one embodiment, obtaining the usage time of the high-voltage AC cable in operation and calculating the aging coefficient of the high-voltage AC cable according to the usage time includes:

[0062] Obtaining the operational usage time and the preset maximum usable time of the high-voltage AC cable, and obtaining the service life consumption coefficient by combining the operational usage time and the preset maximum usable time;

[0063] Obtain the average maintenance time interval during the operation of the high-voltage AC cable, obtain the time interval from the current time to the last maintenance, divide the time interval from the current time to the last maintenance by the average maintenance time interval, and obtain the maintenance coefficient;

[0064] The aging coefficient of the high-voltage AC cable is calculated based on the service life consumption coefficient and the maintenance coefficient. The calculation formula is: ;

[0065] In the formula, is the aging coefficient of the high voltage AC cable, and are the service life consumption coefficient and the maintenance coefficient, respectively. They are and The preset scaling factor of The scores are greater than 0.

[0066] It should be noted that It is set by professionals according to the actual situation. Generally, The sum of is 1, and no specific limitation or elaboration is given;

[0067] It should be noted that the preset maximum usable time is set by professionals based on the actual quality and application scenarios of high-voltage AC cables, according to experience and data analysis, and is not limited or elaborated on. In addition, the usage time data can be obtained through the records of the cable being put into operation, which is usually provided by the engineering archives or automated monitoring system at the time of installation; the maintenance time interval is obtained through the cable maintenance record or maintenance management system, including time data for regular maintenance and emergency repairs; the time interval between the current and last maintenance can be obtained through system logs or sensor data, reflecting the specific time of each maintenance the cable has undergone after being put into operation.

[0068] It should be noted that the larger the aging coefficient of the high-voltage AC cable, the more the geometric model of the high-voltage AC cable cannot be simplified in the simulation of the relationship between the insulation eccentricity and electrical performance of the high-voltage AC cable, because the larger the aging coefficient of the high-voltage AC cable, the larger the service life consumption coefficient, which means that the service life of the high-voltage AC cable is consumed, that is, the cable is close to its designed service life; at the same time, the smaller the maintenance coefficient, that is, the shorter the interval from the last maintenance, which means that the cable fails or requires maintenance more frequently, reflecting the high degree of aging of the cable. At this time, the cable may have more structural or electrical performance problems, such as insulation material degradation, conductor corrosion, etc., which will affect the overall performance of the cable. The larger the aging coefficient, the closer the physical and electrical characteristics of the cable are to the limit state, and the greater the risk of performance degradation. Therefore, in the simulation of the relationship between the insulation eccentricity and electrical performance of the high-voltage AC cable, since the aging of the cable will cause instability and nonlinear changes in electrical performance, the geometric model needs to be described more accurately to accurately capture these effects and avoid the large deviation between the simulation results and the actual situation caused by the simplified model.

[0069] In the implementation method, the benefit of analyzing the aging coefficient of the high-voltage AC cable for judging whether the geometric model of the high-voltage AC cable can be simplified in the simulation of the relationship between the insulation eccentricity and electrical performance of the high-voltage AC cable is as follows: the aging coefficient of the high-voltage AC cable plays a key role in judging whether the geometric model can be simplified. The larger the aging coefficient, the more obvious the performance degradation and structural changes of the cable. At this time, the simplified geometric model may ignore the complex electrical and physical changes that occur during the aging process of the cable, such as cracks in the insulation layer, corrosion of the conductor, or changes in electrical performance caused by aging. These factors directly affect the electric field and current distribution, resulting in the inability of the simplified model to accurately reflect the actual situation. Therefore, understanding the size of the aging coefficient helps to determine whether more accurate geometric modeling is needed. When the aging coefficient is high, it means that the changes in the structure and electrical performance of the cable are more significant, which requires higher model accuracy to ensure the accuracy of the simulation results. This not only helps to optimize the safety and reliability assessment of the cable, but also provides a scientific basis for subsequent maintenance and replacement plans.

[0070] In one embodiment, acquiring an image of a high-voltage AC cable and analyzing the image to calculate a damage coefficient of the high-voltage AC cable includes:

[0071] Acquire a high-resolution image of a high-voltage AC cable, and process the acquired high-resolution image;

[0072] For the processed high-resolution image of the high-voltage AC cable, multiple defect regions on the cable surface are extracted using image processing techniques (such as texture analysis, morphological operations, etc.), and the area of ​​each defect region is calculated;

[0073] Calculate the total area of ​​multiple defective areas on the cable surface, obtain the total surface area of ​​the cable, and calculate the damage factor of the high-voltage AC cable. The calculation formula is: , where is the damage factor of the high voltage AC cable, Indicates the cable surface The area of ​​the defect region, Indicates the order number of the defect area on the cable surface. =1, 2, 3, 4, ..., , is the total number of defective areas on the cable surface, and is a positive integer; Represents the total surface area of ​​the cable.

[0074] It should be noted that high-resolution images of high-voltage AC cables can be obtained by using high-precision cameras, industrial cameras or laser scanning equipment. These devices are usually equipped with high-resolution sensors that can capture tiny defects and damage on the cable surface; in addition,

[0075] The main steps of processing high-resolution images of high-voltage AC cables include denoising, contrast enhancement, and edge detection. First, the noise in the image is removed by applying filtering techniques (such as Gaussian filtering or median filtering) to retain the key details of the cable surface. Then, the image contrast is enhanced using histogram equalization or contrast stretching methods to make the defects on the cable surface more obvious. Next, edge detection algorithms (such as Canny or Sobel) are used to detect the edges of cracks or damage to provide clear features for subsequent processing. After that, texture analysis (such as gray level co-occurrence matrix or LBP) and morphological operations (such as dilation, corrosion, opening operations, etc.) are used to further extract and enhance the morphological features of cable surface defects. Finally, different defect areas are segmented and marked by image segmentation algorithms to calculate the damage coefficient.

[0076] It should be noted that the larger the damage coefficient of the high-voltage AC cable, the more the geometric model of the high-voltage AC cable cannot be simplified in the simulation of the relationship between the insulation eccentricity and electrical performance of the high-voltage AC cable, because the larger the damage coefficient of the high-voltage AC cable, the more serious the damage and defects on the cable surface, which usually means that the insulation layer of the cable may have problems such as cracks, corrosion or wear. These damages will cause the geometric shape of the cable to change, especially the relationship between the eccentricity of the insulation layer and the electrical performance will become more complicated. Therefore, in the simulation, if the damage coefficient is large, the geometric model of the cable cannot be simplified. The simplified geometric model may ignore the effects of these damages on electrical properties such as electric field distribution, local temperature rise, and insulation breakdown, which become critical when the damage is serious. The geometric irregularities caused by damage will lead to uneven changes in electrical properties, affecting the electrical field distribution and thermal stability of the cable, so a more accurate geometric model is needed for simulation to ensure the accuracy and reliability of the results.

[0077] In the implementation method, the benefit of analyzing the damage coefficient of the high-voltage AC cable for judging whether the geometric model of the high-voltage AC cable can be simplified in the simulation of the relationship between the insulation eccentricity and electrical performance of the high-voltage AC cable is as follows: Analyzing the damage coefficient of the high-voltage AC cable is of great significance for judging whether the geometric model can be simplified. The damage coefficient can directly reflect the defects and damage degree on the surface of the cable, which will have a profound impact on the electrical performance of the cable, especially the insulation performance and local electric field distribution. When the damage coefficient is high, the geometric shape deviation of the cable is aggravated, resulting in an increase in the unevenness of the electric field distribution, which in turn affects the stability and safety of the electrical performance. In this case, the simplified geometric model may ignore the influence of cable surface defects on factors such as electric field distribution, local thermal effects and electrical breakdown, resulting in deviations in the simulation results. By considering the damage coefficient, we can more accurately judge whether it is necessary to maintain a complex geometric model, ensure the accuracy of the simulation results, and avoid potential risks caused by simplification in practical applications.

[0078] In one embodiment, obtaining the operating frequency of the high-voltage AC cable during operation, and calculating the operating frequency influence coefficient of the high-voltage AC cable according to the operating frequency includes:

[0079] Get the average operating frequency when the high voltage AC cable is running , and obtain the electric field strength of the high-voltage AC cable at the average operating frequency and the electric field strength of the high voltage AC cable at the preset reference low frequency operating frequency , calculate the frequency response factor , the calculation formula is: ;

[0080] Get the total length of the high voltage AC cable , calculate the electromagnetic field complexity coefficient , the calculation formula is: , where Indicates the position along the cable length, Indicates the magnetic field strength at position The rate of change of magnetic field strength with respect to position The derivative of ; it reflects the changing trend and speed of the magnetic field at different positions in the cable; The electric field strength at position The rate of change of the electric field strength with respect to position The derivative of ; it reflects the speed or gradient of the electric field at each position of the cable. The greater the gradient, the more drastic the electric field change;

[0081] Calculate the operating frequency influence coefficient of high voltage AC cables , the calculation formula is: .

[0082] It should be noted that the average operating frequency of the high-voltage AC cable can be obtained through real-time monitoring or power system monitoring; the electric field strength and the electric field strength at the reference frequency It can be obtained by sensors or electrical measuring devices in the cable; the total length of the cable is usually provided by the design parameters of the cable; the electric field strength and magnetic field strength at the x position can be obtained in a variety of ways. Usually, the measurement of electric field and magnetic field strength can rely on sensors installed outside the cable, such as electric field probes and Hall effect magnetic field sensors, which can monitor the distribution of electric and magnetic fields in real time at different positions.

[0083] It should be noted that the larger the working frequency influence coefficient of the high-voltage AC cable, the more difficult it is to simplify the geometric model of the high-voltage AC cable in the simulation of the relationship between the insulation eccentricity and electrical performance of the high-voltage AC cable, because the larger the working frequency influence coefficient (FIC) of the high-voltage AC cable, the more significant the influence of frequency on the electromagnetic field distribution inside the cable. In this case, the changes of electric and magnetic fields at different positions are more complex, so the geometric structure of the cable is more sensitive to the electrical performance. This makes it impossible to simplify the geometric model of the cable, because the simplified model may ignore or underestimate these high-frequency effects, resulting in inaccurate distribution of electric and magnetic fields, thereby affecting the accuracy and reliability of the simulation results. In the analysis of electrical performance, especially when evaluating the influence of insulation eccentricity on cable performance, only by considering detailed geometric features can the complex changes of electromagnetic effects be fully captured. Therefore, in the case of high FIC values, a more sophisticated geometric model must be used to ensure that the simulation can truly reflect the actual working state of the cable.

[0084] In the implementation method, the benefit of analyzing the working frequency influence coefficient of the high-voltage AC cable for judging whether the geometric model of the high-voltage AC cable can be simplified in the simulation of the relationship between the insulation eccentricity and electrical performance of the high-voltage AC cable is: the working frequency influence coefficient of the high-voltage AC cable is of great significance for judging whether the geometric model can be simplified. By analyzing the working frequency influence coefficient, the influence of frequency on the electromagnetic effect of the cable can be evaluated. If the working frequency influence coefficient is low, it means that the changes of the electric field and magnetic field of the cable at this frequency are relatively simple, and the geometric model can be appropriately simplified, thereby reducing the amount of calculation and simulation complexity, and improving the simulation efficiency. This can save computing resources and time without losing accuracy in practical applications, such as evaluating the influence of cable insulation eccentricity on electrical performance, especially when facing a large amount of cable data, and can quickly obtain effective results. However, if the working frequency influence coefficient is large and the influence of frequency on electromagnetic effects is more complex, a more sophisticated geometric model is required to ensure the accuracy of the simulation results. Therefore, the working frequency influence coefficient not only helps to judge the feasibility of model simplification, but also provides a theoretical basis for reasonable simulation resource allocation.

[0085] In one embodiment, the model irreducible coefficients obtained according to the operating environment instability coefficient, aging coefficient, damage coefficient and operating frequency influence coefficient of the high-voltage AC cable include:

[0086] ;

[0087] In the formula, is the irreducible coefficient of the model, , 、 、 They are the operating environment instability coefficient, aging coefficient, damage coefficient and operating frequency influence coefficient. 、 、 、 They are , 、 、 The preset scaling factor of 、 、 、 Both are greater than 0.

[0088] It should be noted that 、 、 、 It is set by professionals according to the actual situation. Generally, 、 、 、 The sum is 1, or it can be other numbers, without specific limitation; in addition, before calculating the simplified coefficients of the model, it is necessary to remove the units of the operating environment instability coefficient, aging coefficient, damage coefficient and operating frequency influence coefficient.

[0089] In one embodiment, comparing the model irreducible coefficient with a preset model irreducible coefficient threshold, and judging whether the geometric model of the high-voltage AC cable can be simplified according to the comparison result includes:

[0090] The model irreducible coefficient is compared with the preset model irreducible coefficient threshold. If the model irreducible coefficient is greater than or equal to the preset model irreducible coefficient threshold, it means that the geometric model of the high-voltage AC cable cannot be simplified, and the relationship between the insulation eccentricity and the electrical performance of the high-voltage AC cable needs to be simulated based on the unsimplified geometric model of the high-voltage AC cable.

[0091] If the model unsimplifiable coefficient is less than the preset model unsimplifiable coefficient threshold, it means that the geometric model of the high-voltage AC cable can be simplified, and the relationship between the insulation eccentricity and electrical performance of the high-voltage AC cable can be simulated based on the simplified geometric model of the high-voltage AC cable.

[0092] It should be noted that the threshold value of the irreducible coefficient of the preset model is set by professionals based on actual conditions and is not limited or elaborated on in detail.

[0093] It should be noted that the process of comparing the model irreducible coefficient with the preset model irreducible coefficient threshold is actually to determine whether the geometric model needs to be simplified during the simulation of the high-voltage AC cable. When the model irreducible coefficient is greater than or equal to the preset threshold, it indicates that there are more complex environmental factors and influences in the operation of the cable, such as high-frequency electromagnetic fields, aging, damage and other factors, which will have a significant impact on the electrical performance of the cable. Therefore, it is necessary to retain a higher-precision geometric model to more accurately simulate the relationship between insulation eccentricity and electrical performance. In this case, simplifying the geometric model may lead to the loss of important details, thereby affecting the accuracy and reliability of the simulation results. When the model irreducible coefficient is less than the preset threshold, it means that the geometric structure of the cable is relatively simple, or the external environment has little effect on the performance of the cable. Therefore, the geometric model can be appropriately simplified to reduce the computational complexity, while still maintaining sufficient simulation accuracy and reducing computing time and resource consumption. This decision-making process helps to optimize the simulation efficiency and accuracy of high-voltage AC cables and ensure that the use of computing resources can be flexibly adjusted in different scenarios.

[0094] In the implementation method, by reasonably judging whether to simplify the geometric model of the high-voltage AC cable, the simulation efficiency and the utilization rate of computing resources can be significantly improved. When the model's irreducible coefficient is low, geometric model simplification can not only shorten the simulation time and reduce the computational complexity, but also reduce the consumption of computing resources without losing accuracy, which is particularly important for large-scale simulation or real-time calculation. When the model's irreducible coefficient is high, retaining a detailed geometric model can ensure the accuracy of the simulation results and avoid errors caused by simplification, especially in the prediction of key factors such as cable performance and insulation eccentricity, which can provide more reliable data support. Through this flexible adjustment, it is possible to balance computational efficiency and simulation accuracy, thereby improving the performance and practicality of the overall system.

[0095] Based on the same inventive concept, the present invention also provides a simulation system for the relationship between insulation eccentricity and electrical performance of a high-voltage AC cable. Figure 2 , Figure 2 A framework diagram of a system for simulating the relationship between insulation eccentricity and electrical performance of a high-voltage AC cable provided in an embodiment of the present invention, the system comprising:

[0096] Environmental instability module: obtains the operating environment data of the high-voltage AC cable, and calculates the operating environment instability coefficient of the high-voltage AC cable based on the operating environment data;

[0097] Aging module: obtains the use time of the high-voltage AC cable in operation, and calculates the aging coefficient of the high-voltage AC cable according to the use time;

[0098] Damage module: obtains the image of the high-voltage AC cable, analyzes the image and calculates the damage coefficient of the high-voltage AC cable;

[0099] Working frequency influence module: obtains the working frequency of the high-voltage AC cable during operation, and calculates the working frequency influence coefficient of the high-voltage AC cable according to the working frequency;

[0100] Judgment module: obtain the model irreducible coefficient according to the operating environment instability coefficient, aging coefficient, damage coefficient and operating frequency influence coefficient of the high-voltage AC cable, compare the model irreducible coefficient with the preset model irreducible coefficient threshold, and judge whether the geometric model of the high-voltage AC cable can be simplified based on the comparison results.

[0101] Based on the simulation system for the relationship between insulation eccentricity and electrical performance of a high-voltage AC cable provided in an embodiment of the present invention, through the above method, it is possible to judge whether the geometric model of the high-voltage AC cable can be simplified according to the actual situation, thereby ensuring the accuracy of the simulation results, making the evaluation of the electrical performance of the cable accurate, and being able to truly reflect the performance of the cable under actual working conditions, reducing the risk of cable failure, and ensuring the safety and reliability of the electrical system.

[0102] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be used to artificially limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A simulation method for the relationship between insulation eccentricity and electrical performance of a high-voltage AC cable, characterized in that: The following steps are involved: Acquire the operating environment data of the high-voltage AC cable, and calculate the operating environment instability coefficient of the high-voltage AC cable according to the operating environment data; Obtaining the service time of the high-voltage AC cable in operation, and calculating the aging coefficient of the high-voltage AC cable according to the service time; Acquire an image of a high-voltage AC cable, and analyze the image to calculate a damage factor of the high-voltage AC cable; Obtaining the operating frequency of the high-voltage AC cable during operation, and calculating the operating frequency influence coefficient of the high-voltage AC cable according to the operating frequency; The model irreducible coefficient is obtained according to the operating environment instability coefficient, aging coefficient, damage coefficient and operating frequency influence coefficient of the high-voltage AC cable, and the model irreducible coefficient is compared with a preset model irreducible coefficient threshold, and whether the geometric model of the high-voltage AC cable can be simplified is judged according to the comparison result; According to the operating environment instability coefficient, aging coefficient, damage coefficient and operating frequency influence coefficient of the high-voltage AC cable, the model's irreducible coefficients include: ； In the formula, is the irreducible coefficient of the model, , 、 、 They are the operating environment instability coefficient, aging coefficient, damage coefficient and operating frequency influence coefficient. 、 、 、 They are , 、 、 The preset scaling factor of 、 、 、 All are greater than 0; According to the comparison results, it can be judged whether the geometric model of the high-voltage AC cable can be simplified, including: The model irreducible coefficient is compared with the preset model irreducible coefficient threshold. If the model irreducible coefficient is greater than or equal to the preset model irreducible coefficient threshold, it means that the geometric model of the high-voltage AC cable cannot be simplified, and the relationship between the insulation eccentricity and the electrical performance of the high-voltage AC cable needs to be simulated based on the unsimplified geometric model of the high-voltage AC cable. If the model unsimplifiable coefficient is less than the preset model unsimplifiable coefficient threshold, it means that the geometric model of the high-voltage AC cable can be simplified, and the relationship between the insulation eccentricity and electrical performance of the high-voltage AC cable can be simulated based on the simplified geometric model of the high-voltage AC cable.

2. The method for simulating the relationship between insulation eccentricity and electrical performance of a high-voltage AC cable according to claim 1, characterized in that: The operating environment instability coefficient of the high-voltage AC cable is calculated based on the operating environment data, including: Obtaining the operating environment data type of the high-voltage AC cable, and obtaining the actual data value of each type of data, to obtain a sequence of actual data values ​​based on time sequence; The actual data value sequence in the actual data value sequence is labeled as , represents the sequence number of the actual data value sequence in the actual data value sequence, =1, 2, 3, 4, ..., , is the total number of actual data value sequences in the actual data value sequence, and is a positive integer; Calculate the mean of the actual data value sequence. The calculation formula is: ; Calculate the operating environment instability coefficient of the high-voltage AC cable using the following formula: ;in, is the operating environment instability coefficient of the high voltage AC cable, It is the sequence number of the operating environment data type of the high voltage AC cable. is the total number of operating environment data types for high voltage AC cables, and Is a positive integer.

3. The method for simulating the relationship between insulation eccentricity and electrical performance of a high-voltage AC cable according to claim 1, characterized in that: The aging factor of high voltage AC cables calculated based on the usage time includes: Obtaining the operational usage time and the preset maximum usable time of the high-voltage AC cable, and obtaining the service life consumption coefficient by combining the operational usage time and the preset maximum usable time; Obtain the average maintenance time interval during the operation of the high-voltage AC cable, obtain the time interval from the current time to the last maintenance, divide the time interval from the current time to the last maintenance by the average maintenance time interval, and obtain the maintenance coefficient; The aging coefficient of the high-voltage AC cable is calculated based on the service life consumption coefficient and the maintenance coefficient. The calculation formula is: ; In the formula, is the aging coefficient of the high voltage AC cable, and are the service life consumption coefficient and the maintenance coefficient, respectively. They are and The preset scaling factor of The scores are greater than 0.

4. The method for simulating the relationship between insulation eccentricity and electrical performance of a high-voltage AC cable according to claim 1, characterized in that: The image analysis and calculation of the damage factor of the high voltage AC cable include: Acquire a high-resolution image of a high-voltage AC cable, and process the acquired high-resolution image; For the processed high-resolution image of the high-voltage AC cable, multiple defect regions on the cable surface are extracted using image processing technology, and the area of ​​each defect region is calculated; Calculate the total area of ​​multiple defective areas on the cable surface, obtain the total surface area of ​​the cable, and calculate the damage factor of the high-voltage AC cable. The calculation formula is: , where is the damage factor of the high voltage AC cable, Indicates the cable surface The area of ​​the defect region, Indicates the order number of the defect area on the cable surface. =1, 2, 3, 4, ..., , is the total number of defective areas on the cable surface, and is a positive integer; Represents the total surface area of ​​the cable.

5. The method for simulating the relationship between insulation eccentricity and electrical performance of a high-voltage AC cable according to claim 1, characterized in that: The working frequency influence coefficient of high voltage AC cable calculated according to the working frequency includes: Get the average operating frequency when the high voltage AC cable is running , and obtain the electric field strength of the high-voltage AC cable at the average operating frequency and the electric field strength of the high voltage AC cable at the preset reference low frequency operating frequency , calculate the frequency response factor , the calculation formula is: ; Get the total length of the high voltage AC cable , calculate the electromagnetic field complexity coefficient , the calculation formula is: , where Indicates the position along the cable length, Indicates the magnetic field strength at position The rate of change of magnetic field strength with respect to position The derivative of The electric field strength at position The rate of change of the electric field strength with respect to position The derivative of Calculate the operating frequency influence coefficient of high voltage AC cables , the calculation formula is: .

6. A simulation system for the relationship between insulation eccentricity and electrical performance of a high-voltage AC cable, used to implement the simulation method for the relationship between insulation eccentricity and electrical performance of a high-voltage AC cable as described in any one of claims 1 to 5, characterized in that: The system comprises: Environmental instability module: obtains the operating environment data of the high-voltage AC cable, and calculates the operating environment instability coefficient of the high-voltage AC cable based on the operating environment data; Aging module: obtains the use time of the high-voltage AC cable in operation, and calculates the aging coefficient of the high-voltage AC cable according to the use time; Damage module: obtains the image of the high-voltage AC cable, analyzes the image and calculates the damage coefficient of the high-voltage AC cable; Working frequency influence module: obtains the working frequency of the high-voltage AC cable during operation, and calculates the working frequency influence coefficient of the high-voltage AC cable according to the working frequency; Judgment module: obtain the model irreducible coefficient according to the operating environment instability coefficient, aging coefficient, damage coefficient and operating frequency influence coefficient of the high-voltage AC cable, compare the model irreducible coefficient with the preset model irreducible coefficient threshold, and judge whether the geometric model of the high-voltage AC cable can be simplified based on the comparison results.

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