Method and System for Preventing Voltage Breakdown Test Based on Glass Fiber Sleeve

Abstract

The present invention relates to the technical field of electrical insulation testing, and discloses a method and system for anti-voltage breakdown testing based on a glass fiber sleeve, including: calculating a quality index value corresponding to the glass fiber sleeve, constructing an equivalent circuit model corresponding to the glass fiber sleeve, performing pre-processing of electric field simulation on the equivalent circuit model to obtain a target equivalent circuit, performing electric field simulation processing on the target equivalent circuit to obtain electric field simulation data; calculating a radial electric field intensity corresponding to the target equivalent circuit, evaluating the voltage withstand performance corresponding to the glass fiber sleeve; calculating the breakdown strength of the glass fiber sleeve; performing electrical parameter simulation processing on the target equivalent circuit, measuring electrical characteristic parameters during the simulation processing, calculating the active power loss corresponding to the target equivalent circuit, and performing anti-voltage breakdown test analysis on the glass fiber sleeve to obtain a breakdown analysis result. The present invention can improve the accuracy of anti-voltage breakdown testing of glass fiber sleeves.

Description

Technical Field

[0001] The present invention relates to a method and system for preventing voltage breakdown testing based on a glass fiber sleeve, belonging to the technical field of electrical insulation testing. Background Art

[0002] As an important insulating component in electrical equipment, glass fiber sleeves are widely used in fields such as power systems and electronic devices. Their insulation performance is directly related to the safe and stable operation of the equipment. With the continuous development of the power industry, the requirements for the reliability and safety of electrical equipment are increasing day by day, and the voltage breakdown prevention performance testing of glass fiber sleeves becomes increasingly important.

[0003] Currently, the testing methods for glass fiber sleeves mainly focus on measuring their basic electrical parameters, such as insulation resistance, dielectric constant, etc. These traditional testing methods can reflect the insulation performance of the sleeves to a certain extent, but there are limitations in evaluating the voltage breakdown prevention characteristics of the sleeves in a complex electric field environment. When the existing testing technologies evaluate the voltage breakdown prevention performance of glass fiber sleeves, they lack in-depth research on the internal microstructure changes and charge-related characteristics of the sleeves. In actual operation, phenomena such as uneven electric field distribution, partial discharge, and space charge accumulation inside the sleeves will gradually lead to a decline in the insulation performance of the sleeves, and ultimately trigger voltage breakdown accidents. However, the existing testing methods are difficult to accurately capture these microscopic change processes and cannot comprehensively evaluate the voltage breakdown prevention performance of the sleeves, thereby reducing the accuracy of the voltage breakdown prevention testing of glass fiber sleeves. Summary of the Invention

[0004] The present invention provides a method and system for preventing voltage breakdown testing based on a glass fiber sleeve, and its main purpose is to solve the problem of reduced accuracy of the voltage breakdown prevention testing of glass fiber sleeves.

[0005] To achieve the above object, a method for preventing voltage breakdown testing based on a glass fiber sleeve provided by the present invention includes:

[0006] Obtain the specification parameters of the glass fiber sleeve to be tested, collect the production process data of the glass fiber sleeve, calculate the corresponding quality index value based on the production process data, and query the product standard information corresponding to the glass fiber sleeve;

[0007] Identify the internal structure and external shape corresponding to the glass fiber sleeve, combine the quality index value, the internal structure, the external shape, and the product standard information to construct an equivalent circuit model corresponding to the glass fiber sleeve, perform pre-processing of electric field simulation on the equivalent circuit model to obtain a target equivalent circuit, and perform electric field simulation processing on the target equivalent circuit to obtain electric field simulation data;

[0008] Based on the electric field simulation data, calculate the radial electric field intensity corresponding to the target equivalent circuit, and evaluate the withstand voltage performance of the glass fiber sleeve according to the radial electric field intensity;

[0009] During the electric field simulation, gradually increase the voltage applied to the target equivalent circuit, and at the same time monitor the circuit response characteristics of the target equivalent circuit. When the circuit response characteristics reach the preset breakdown characteristic conditions, it is determined that the target equivalent circuit has a breakdown phenomenon, record the breakdown voltage value corresponding to the breakdown phenomenon, and calculate the sleeve breakdown strength of the glass fiber sleeve in combination with the breakdown voltage value and the specification parameters;

[0010] Perform electrical parameter simulation processing on the target equivalent circuit, measure the electrical characteristic parameters during the simulation processing, calculate the active power loss corresponding to the target equivalent circuit based on the electrical characteristic parameters, and perform the anti-voltage breakdown test analysis of the glass fiber sleeve in combination with the sleeve breakdown strength, the withstand voltage performance, and the active power loss to obtain the breakdown analysis result.

[0011] Optionally, calculating the quality index value corresponding to the glass fiber sleeve based on the production process data includes:

[0012] Query the quality evaluation standard corresponding to the glass fiber sleeve, and analyze the data characteristic attributes corresponding to the production process data;

[0013] Calculate the fitting coefficient between the quality evaluation standard and the data characteristic attributes;

[0014] Extract the quality evaluation data from the production process data according to the fitting coefficient;

[0015] Calculate the data correlation strength between the quality evaluation data and other data in the production process data;

[0016] Based on the data correlation strength, screen out the quality-related data from the production process data;

[0017] Calculate the quality index value corresponding to the glass fiber sleeve by combining the quality evaluation data and the quality-related data.

[0018] Optionally, calculating the fitting coefficient between the quality evaluation standard and the data characteristic attributes includes:

[0019] Calculate the influence weight between the quality evaluation standard and the data characteristic attributes;

[0020] Query the standard reference value corresponding to the quality evaluation standard, and extract the actual data value corresponding to the data characteristic attributes;

[0021] Calculate the average values corresponding to the quality evaluation criteria and the data characteristic attributes respectively by combining the standard reference values and the actual data values, so as to obtain the standard average value and the data average value;

[0022] Combine the influence weight, the standard reference value, the actual data value, the standard average value and the data average value, and calculate the fitting coefficient between the quality evaluation criteria and the data characteristic attributes through the following formula:

[0023]

[0024] where A represents the fitting coefficient between the quality evaluation criteria and the data characteristic attributes, represents the influence weight between the a-th quality evaluation criterion and the b-th data characteristic attribute, represents the standard reference value corresponding to the a-th quality evaluation criterion, represents the standard average value, represents the standard deviation corresponding to the standard reference value, represents the actual data value corresponding to the b-th data characteristic attribute, represents the data average value, represents the standard deviation corresponding to the actual data value. a represents the serial number of the quality evaluation criterion, x represents the number of quality evaluation criteria, b represents the serial number of the data characteristic attribute, and y represents the number of data characteristic attributes.

[0025] Optionally, constructing the equivalent circuit model corresponding to the glass fiber sleeve by combining the quality index value, the internal structure, the external shape and the product standard information includes:

[0026] Extract the electrical parameter information and physical dimension data of the glass fiber sleeve from the product standard information;

[0027] Construct an initial circuit model of the glass fiber sleeve according to the electrical parameter information, the physical dimension data, the internal structure and the external shape;

[0028] Query the material property information corresponding to the internal structure, and analyze the material electrical characteristics corresponding to the internal structure based on the material property information;

[0029] Perform parameter adjustment processing on the initial circuit model according to the quality index value and the material electrical characteristics to obtain the equivalent circuit model corresponding to the glass fiber sleeve.

[0030] Optionally, the preprocessing of the electric field simulation on the equivalent circuit model to obtain the target equivalent circuit includes:

[0031] Simplify the equivalent circuit model to obtain a simplified equivalent circuit model;

[0032] Analyze the circuit topology of the simplified equivalent circuit model and calculate the circuit complexity of the circuit topology;

[0033] Determine the circuit analysis method applicable to the simplified equivalent circuit model according to the complexity index;

[0034] Identify the electric field sensitive point region of the simplified equivalent circuit model;

[0035] Based on the circuit analysis method and the electric field sensitive point region, perform optimization of the circuit element parameters and node setting processing on the simplified equivalent circuit model to obtain a target equivalent circuit.

[0036] Optionally, calculating the radial electric field intensity corresponding to the target equivalent circuit according to the electric field simulation data includes:

[0037] Based on the electric field simulation data, determine the applied voltage and relative permittivity of the circuit corresponding to the target equivalent circuit;

[0038] Detect the circuit charge corresponding to the target equivalent circuit and assign a weight coefficient to the circuit charge;

[0039] Combining the relative permittivity, the circuit charge and the weight coefficient, calculate the radial electric field intensity corresponding to the target equivalent circuit through the following formula:

[0040]

[0041] Among them, E represents the radial electric field intensity corresponding to the target equivalent circuit, represents the vacuum permittivity, represents the relative permittivity, d represents the radius of the electric field intensity corresponding to the target equivalent circuit, represents the weight coefficient of the e-th circuit charge, represents the charge distribution function, e represents the serial number corresponding to the circuit charge, and p represents the number of circuit charges.

[0042] Optionally, calculating the breakdown strength of the glass fiber sleeve by combining the breakdown voltage value and the specification parameters includes:

[0043] Extract the inner diameter, outer diameter and length of the glass fiber sleeve corresponding to the glass fiber sleeve from the specification parameters;

[0044] Combining the inner diameter and outer diameter of the sleeve, the electric field concentration factor corresponding to the glass fiber sleeve can be calculated by:

[0045]

[0046] Among them, k represents the electric field concentration factor corresponding to the glass fiber sleeve, represents the inner diameter of the sleeve, represents the outer diameter of the sleeve;

[0047] Combined with the electric field concentration factor, the breakdown voltage value and the sleeve length, the sleeve breakdown strength of the glass fiber sleeve is calculated through the following formula:

[0048]

[0049] Among them, H represents the sleeve breakdown strength of the glass fiber sleeve, k represents the electric field concentration factor, U represents the breakdown voltage value, L represents the sleeve length, represents the vacuum permittivity.

[0050] Optionally, calculating the active power loss corresponding to the target equivalent circuit based on the electrical characteristic parameters includes:

[0051] Extracting the terminal voltage value and the terminal current value corresponding to the target equivalent circuit from the electrical characteristic parameters;

[0052] Calculating the cosine parameter of the electrical phase angle between the terminal voltage value and the terminal current value;

[0053] Combined with the terminal voltage value, the terminal current value and the cosine parameter of the electrical phase angle, the active power loss corresponding to the target equivalent circuit is calculated through the following formula:

[0054]

[0055] Among them, M represents the active power loss corresponding to the target equivalent circuit, represents the terminal voltage value, represents the terminal current value, represents the cosine parameter of the electrical phase angle, represents the power factor.

[0056] Optionally, calculating the cosine parameter of the electrical phase angle between the terminal voltage value and the terminal current value includes:

[0057] Constructing phase diagrams corresponding to the terminal voltage value and the terminal current value respectively to obtain a voltage phase diagram and a current phase diagram;

[0058] Performing a merging process on the voltage phase diagram and the current phase diagram to obtain a merged phase diagram;

[0059] Identifying the voltage zero-crossing point and the current zero-crossing point in the merged phase diagram;

[0060] Combining the voltage zero-crossing point and the current zero-crossing point, the cosine parameter of the electrical phase angle between the terminal voltage value and the terminal current value can be calculated by the following formula:

[0061]

[0062] Wherein, represents the cosine parameter of the electrical phase angle between the terminal voltage value and the terminal current value, represents the current zero-crossing point, represents the voltage zero-crossing point, and T represents the phase period of the combined phase diagram.

[0063] To solve the above problems, the present invention also provides a voltage breakdown prevention test system based on a glass fiber sleeve, and the system includes:

[0064] An index value calculation module, configured to obtain the specification parameters of the glass fiber sleeve to be tested, collect the production process data of the glass fiber sleeve, calculate the quality index value corresponding to the glass fiber sleeve based on the production process data, and query the product standard information corresponding to the glass fiber sleeve;

[0065] An electric field simulation processing module, configured to identify the internal structure and external shape corresponding to the glass fiber sleeve, construct an equivalent circuit model corresponding to the glass fiber sleeve by combining the quality index value, the internal structure, the external shape, and the product standard information, perform pre-processing of electric field simulation on the equivalent circuit model to obtain a target equivalent circuit, and perform electric field simulation processing on the target equivalent circuit to obtain electric field simulation data;

[0066] A withstand voltage performance evaluation module, configured to calculate the radial electric field strength corresponding to the target equivalent circuit according to the electric field simulation data, and evaluate the withstand voltage performance corresponding to the glass fiber sleeve based on the radial electric field strength;

[0067] A sleeve breakdown strength calculation module, configured to gradually increase the voltage applied to the target equivalent circuit during the electric field simulation process, and simultaneously monitor the circuit response characteristics of the target equivalent circuit. When the circuit response characteristics reach the preset breakdown characteristic conditions, it is determined that the target equivalent circuit has a breakdown phenomenon, record the breakdown voltage value corresponding to the breakdown phenomenon, and calculate the sleeve breakdown strength of the glass fiber sleeve by combining the breakdown voltage value and the specification parameters;

[0068] The breakdown test analysis module is used to perform electrical parameter simulation processing on the target equivalent circuit, measure the electrical characteristic parameters during the simulation processing, calculate the active power loss corresponding to the target equivalent circuit based on the electrical characteristic parameters, and combine the bushing breakdown strength, the withstand voltage performance, and the active power loss to perform the anti-voltage breakdown test analysis of the fiberglass bushing to obtain a breakdown analysis result.

[0069] Compared with the problems described in the background art, the present invention can calculate the quality index value corresponding to the fiberglass bushing based on the production process data, and can understand the product quality corresponding to the fiberglass bushing through the quality index value, improving the construction accuracy of the subsequent equivalent product model. Further, the present invention constructs the equivalent circuit model corresponding to the fiberglass bushing by combining the quality index value, the internal structure, the external shape, and the product standard information, and can obtain the electrical performance equivalent model of the fiberglass bushing for subsequent operations such as electric field simulation. The present invention calculates the radial electric field intensity corresponding to the target equivalent circuit according to the electric field simulation data, can quantify the distribution of the electric field around the circuit model, and evaluates the withstand voltage performance corresponding to the fiberglass bushing based on the radial electric field intensity, so as to judge the insulation ability and the withstand voltage level of the fiberglass bushing in the electric field environment. Further, during the electric field simulation process, the present invention gradually increases the voltage applied to the target equivalent circuit while monitoring the circuit response characteristics of the target equivalent circuit. When the circuit response characteristics reach the preset breakdown characteristic conditions, it is determined that the target equivalent circuit has a breakdown phenomenon, and the breakdown voltage value corresponding to the breakdown phenomenon is recorded. Determining the breakdown phenomenon by monitoring the circuit response characteristics helps to deeply understand the failure mechanism of the bushing under the action of the electric field, thus indicating the direction for optimizing the bushing material and structural design, ultimately improving the reliability and stability of the fiberglass bushing in the high-voltage environment, ensuring the safe operation of the electrical system, and further providing an important basis for the subsequent calculation of the bushing breakdown strength. Further, the present invention calculates the active power loss corresponding to the target equivalent circuit based on the electrical characteristic parameters, can deeply understand the power loss situation of the target equivalent circuit under different working conditions, and further provides a key basis for evaluating the circuit performance. Therefore, the anti-voltage breakdown test method and system based on the fiberglass bushing provided by the embodiments of the present invention can improve the accuracy of the anti-voltage breakdown test of the fiberglass bushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Figure 1 It is a schematic flowchart of an anti-voltage breakdown test method based on a fiberglass bushing provided by an embodiment of the present invention;

[0071] Figure 2This is a schematic diagram of a module for implementing the method for testing voltage breakdown prevention based on a glass fiber sleeve according to an embodiment of the present invention.

[0072] The implementation, functional features, and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments. Specific embodiments

[0073] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0074] An embodiment of the present application provides a method for testing voltage breakdown prevention based on a glass fiber sleeve. The execution subject of the method for testing voltage breakdown prevention based on a glass fiber sleeve includes, but is not limited to, at least one of electronic devices such as a server, a terminal, etc. that can be configured to execute the method provided by this embodiment of the present application. In other words, the method for testing voltage breakdown prevention based on a glass fiber sleeve can be executed by software or hardware installed on a terminal device or a server device. The server includes, but is not limited to: a single server, a server cluster, a cloud server, or a cloud server cluster, etc.

[0075] Embodiment 1:

[0076] Referring to Figure 1 As shown, it is a schematic flowchart of a method for testing voltage breakdown prevention based on a glass fiber sleeve according to an embodiment of the present invention. In this embodiment, the method for testing voltage breakdown prevention based on a glass fiber sleeve includes:

[0077] S1. Obtain the specification parameters of the glass fiber sleeve to be tested, collect the production process data of the glass fiber sleeve, calculate the corresponding quality index value of the glass fiber sleeve based on the production process data, and query the product standard information corresponding to the glass fiber sleeve.

[0078] By calculating the corresponding quality index value of the glass fiber sleeve based on the production process data, the present invention can understand the product quality corresponding to the glass fiber sleeve through the quality index value, and improve the accuracy of constructing the subsequent equivalent product model.

[0079] It should be noted that the glass fiber sleeve is a kind of pipe material commonly used in fields such as electrical insulation. The specification parameters are the standard parameter requirements set for the glass fiber sleeve in terms of size, performance, etc. The production process data are the recorded data of various process conditions during the production and manufacturing of the glass fiber sleeve. The quality index value is the quality quantification characterization value corresponding to the glass fiber sleeve. The product standard information is the specification description information corresponding to the glass fiber sleeve. Further, the collection of the production process data of the glass fiber sleeve can be achieved through monitoring devices on the production line, such as temperature sensors, humidity sensors, and flow sensors, etc. The query of the product standard information corresponding to the glass fiber sleeve can be obtained by referring to relevant industry standard documents.

[0080] Specifically, calculating the quality index value corresponding to the glass fiber sleeve based on the production process data includes:

[0081] Query the quality evaluation standard corresponding to the glass fiber sleeve and analyze the data characteristic attributes corresponding to the production process data;

[0082] Calculate the fit coefficient between the quality evaluation standard and the data characteristic attributes;

[0083] Extract quality evaluation data from the production process data according to the fit coefficient;

[0084] Calculate the data association strength between the quality evaluation data and other data in the production process data;

[0085] Based on the data association strength, screen out quality-related data from the production process data;

[0086] Combine the quality evaluation data and the quality-related data to calculate the quality index value corresponding to the glass fiber sleeve.

[0087] Among them, the quality evaluation standard is the quality measurement criterion corresponding to the glass fiber sleeve. The data characteristic attribute is the characteristic representation corresponding to the production process data. The fit coefficient represents the degree of fit between the quality evaluation standard and the data characteristic attribute. The quality evaluation data are the data in the production process data that are directly related to quality. The data association strength represents the degree of closeness of the association between the quality evaluation data and other data in the production process data. The quality-related data are the data in other data in the production process data that have an association relationship with the quality evaluation data.

[0088] Further, the quality evaluation criteria corresponding to the glass fiber sleeve can be obtained by querying from a predefined standard database, which is a database constructed by pre-collecting a large number of relevant standard specifications for sorting and analysis; the analysis of the data characteristic attributes corresponding to the production process data can be achieved through factor analysis; comparing the fit coefficient with a preset fit coefficient (the preset fit coefficient can be set to 0.7 or adjusted according to the actual application scenario), when the fit coefficient is greater than the preset fit coefficient, quality evaluation data is extracted from the production process data; the data correlation strength between the quality evaluation data and other data in the production process data can be calculated by the Spearman rank correlation coefficient method; based on the numerical value of the data correlation strength, the correlation level between other data in the production process data is determined, and data with high correlation is selected from other data in the production process data as quality correlation data; the quality evaluation data and the quality correlation data are quantitatively processed to obtain data quantization values, and the data quantization values corresponding to each quality index are added to obtain the quality index value corresponding to the glass fiber sleeve.

[0089] Further, as an alternative embodiment of the present invention, calculating the fit coefficient between the quality evaluation criteria and the data characteristic attributes includes:

[0090] Calculating the influence weight between the quality evaluation criteria and the data characteristic attributes;

[0091] Querying the standard reference value corresponding to the quality evaluation criteria and extracting the actual data value corresponding to the data characteristic attributes;

[0092] Combining the standard reference value and the actual data value, respectively calculating the average values corresponding to the quality evaluation criteria and the data characteristic attributes to obtain the standard average value and the data average value;

[0093] Combining the influence weight, the standard reference value, the actual data value, the standard average value and the data average value, calculating the fit coefficient between the quality evaluation criteria and the data characteristic attributes through the following formula:

[0094]

[0095] Wherein, A represents the fit coefficient between the quality evaluation criteria and the data characteristic attributes, represents the influence weight between the a-th quality evaluation criteria and the b-th data characteristic attribute, represents the standard reference value corresponding to the a-th quality evaluation criteria, represents the standard average value, represents the standard deviation corresponding to the standard reference value, represents the actual value of the data corresponding to the b-th data feature attribute, represents the average value of the data, represents the standard deviation corresponding to the actual value of the data, a represents the serial number of the quality evaluation standard, x represents the number of quality evaluation standards, b represents the serial number of the data feature attribute, and y represents the number of data feature attributes.

[0096] Among them, the influence weight represents the degree of mutual influence relationship between the quality evaluation standard and the data feature attribute, the standard reference value is the established value corresponding to the quality evaluation standard, and the actual value of the data is the actual presented value corresponding to the data feature attribute. Further, the calculation of the influence weight between the quality evaluation standard and the data feature attribute can be achieved through the ReliefF algorithm, calculating the importance score between the quality evaluation standard and the data feature attribute, and the importance score is used as the influence weight; the standard reference value corresponding to the quality evaluation standard can be obtained by referring to the product quality specification document; the extraction of the actual value of the data corresponding to the data feature attribute can be achieved through a data extraction tool, and the data extraction tool can be written in a programming language, such as a related script written in the Python language; the standard deviation corresponding to the standard reference value can be calculated through the variance calculation formula by combining the corresponding standard reference value and the standard average value; the calculation principle of the standard deviation corresponding to the actual value of the data is the same as that of the standard deviation corresponding to the standard reference value, and will not be elaborated here.

[0097] S2. Identify the internal structure and external shape of the glass fiber sleeve, combine the quality index value, the internal structure, the external shape and the product standard information to construct an equivalent circuit model corresponding to the glass fiber sleeve, perform preprocessing of electric field simulation on the equivalent circuit model to obtain a target equivalent circuit, and perform electric field simulation processing on the target equivalent circuit to obtain electric field simulation data.

[0098] Through the present invention, by combining the quality index value, the internal structure, the external shape and the product standard information to construct an equivalent circuit model corresponding to the glass fiber sleeve, an equivalent electrical performance model of the glass fiber sleeve can be obtained for subsequent operations such as electric field simulation. It should be explained that the internal structure refers to the fiber arrangement, number of layers, presence or absence of inner lining, etc. inside the glass fiber sleeve, and the external shape covers geometric features such as the length, outer diameter, inner diameter, and curvature of the glass fiber sleeve. The equivalent circuit model is a circuit model used to simulate the electrical characteristics of the glass fiber sleeve. Further, the internal structure and external shape corresponding to the glass fiber sleeve can be obtained through high-precision industrial CT scanning technology or three-dimensional laser scanning equipment.

[0099] Specifically, constructing the equivalent circuit model corresponding to the glass fiber sleeve by combining the quality index value, the internal structure, the external shape, and the product standard information includes:

[0100] Extracting the electrical parameter information and physical dimension data of the glass fiber sleeve from the product standard information;

[0101] Constructing the initial circuit model of the glass fiber sleeve based on the electrical parameter information, the physical dimension data, the internal structure, and the external shape;

[0102] Querying the material property information corresponding to the internal structure, and analyzing the electrical characteristics of the material corresponding to the internal structure based on the material property information;

[0103] Performing parameter adjustment processing on the initial circuit model according to the quality index value and the electrical characteristics of the material to obtain the equivalent circuit model corresponding to the glass fiber sleeve.

[0104] Among them, the electrical parameter information includes data such as the dielectric constant and conductivity of the glass fiber sleeve, the physical dimension data refers to dimension information such as its length and diameter, the initial circuit model is the basis for constructing the equivalent circuit model, the material property information is the performance description information corresponding to the internal structure, such as dielectric performance and conductive performance, etc., and the electrical characteristics of the material are the electrical manifestations of the internal structure material, such as resistance characteristics, capacitance characteristics, etc.

[0105] Furthermore, the construction of the initial circuit model of the glass fiber sleeve can use circuit design software, such as Altium Designer, etc.; the material property information corresponding to the internal structure can be obtained by querying the material science database or the technical materials provided by the manufacturer; according to the quality index value and the electrical characteristics of the material, for glass fiber sleeves of different quality grades, different parameter correction methods are used to adjust the component parameters such as resistance and capacitance in the initial circuit model, so as to obtain the equivalent circuit model. For example, if the quality index value is high, it means that the insulation performance of the material is good, and the leakage resistance value in the equivalent circuit can be appropriately reduced; if the quality index value is low, the leakage resistance value is correspondingly increased to reflect the actual electrical performance differences.

[0106] The present invention improves the accuracy and reliability of the subsequent electric field simulation of the equivalent circuit model by performing preprocessing on the equivalent circuit model for electric field simulation. It should be explained that the target equivalent circuit is the circuit model of the equivalent circuit model that is applicable to electric field simulation after preprocessing.

[0107] Specifically, performing preprocessing on the equivalent circuit model for electric field simulation to obtain a target equivalent circuit includes:

[0108] Simplify the equivalent circuit model to obtain a simplified equivalent circuit model;

[0109] Analyze the circuit topology of the simplified equivalent circuit model and calculate the circuit complexity of the circuit topology;

[0110] Determine the circuit analysis method applicable to the simplified equivalent circuit model according to the complexity index;

[0111] Identify the electric field sensitive point region of the simplified equivalent circuit model;

[0112] Based on the circuit analysis method and the electric field sensitive point region, perform optimization of the circuit element parameters and node setting processing on the simplified equivalent circuit model to obtain a target equivalent circuit.

[0113] Among them, the simplified equivalent circuit model is a circuit model obtained by removing the secondary components and connections in the equivalent circuit model that have a minor impact on the electric field simulation results. The circuit topology is the circuit connection method and component layout form of the simplified equivalent circuit model. The circuit complexity is used to quantify the complexity of the circuit topology. The circuit analysis methods include, but are not limited to, the node voltage method, the loop current method, etc. The electric field sensitive point region refers to the parts where the voltage and current change significantly under the action of the electric field or have an important impact on the overall electric field distribution.

[0114] Furthermore, the simplification process of the equivalent circuit model can be carried out according to the circuit equivalence principle and empirical rules; the analysis of the circuit topology of the simplified equivalent circuit model can be realized through graph theory algorithms; the circuit complexity can be comprehensively obtained by calculating parameters such as the number of nodes, the number of branches, and the number of component types in the circuit; select the circuit analysis method according to the circuit complexity. For example, when the complexity is low, the node voltage method can be used, and when the complexity is high, a more complex hybrid analysis method may be required; the identification of the electric field sensitive point region of the simplified equivalent circuit model can be determined by performing a preliminary simulation analysis of the electric field distribution of the circuit and observing the positions where the voltage and current change gradients are large; based on the selected circuit analysis method and the identified electric field sensitive point region, finely tune and optimize the relevant circuit element parameters, and reasonably set the node attributes and initial conditions to obtain the target equivalent circuit.

[0115] By performing electric field simulation processing on the target equivalent circuit, the present invention can obtain the electrical performance data of the target equivalent circuit under different electric field conditions, thereby facilitating the calculation and analysis of parameters such as electric field strength and electric flux. Among them, the electric field simulation data is the output result and the recorded simulation process data when the target equivalent circuit undergoes electric field simulation processing. Further, the electric field simulation processing of the target equivalent circuit can be achieved through professional electric field simulation software, such as COMSOL Multiphysics.

[0116] S3. According to the electric field simulation data, calculate the radial electric field strength corresponding to the target equivalent circuit, and evaluate the withstand voltage performance of the glass fiber sleeve based on the radial electric field strength.

[0117] Based on the electric field simulation data, the present invention calculates the radial electric field strength corresponding to the target equivalent circuit, which can quantify the distribution of the electric field around the circuit model. Based on the radial electric field strength, evaluate the withstand voltage performance of the glass fiber sleeve, thereby judging the insulation ability and the withstand voltage level of the glass fiber sleeve in the electric field environment. Further, the radial electric field strength represents the component of the electric field strength in the direction perpendicular to the axis of the glass fiber sleeve. The magnitude of the radial electric field strength directly affects the withstand voltage performance of the glass fiber sleeve. Generally speaking, the lower the radial electric field strength, the better the withstand voltage performance of the glass fiber sleeve.

[0118] Specifically, calculating the radial electric field strength corresponding to the target equivalent circuit according to the electric field simulation data includes:

[0119] Based on the electric field simulation data, determine the applied voltage and relative permittivity of the circuit corresponding to the target equivalent circuit;

[0120] Detect the circuit charge corresponding to the target equivalent circuit, and assign a weight coefficient to the circuit charge;

[0121] Combining the relative permittivity, the circuit charge, and the weight coefficient, calculate the radial electric field strength corresponding to the target equivalent circuit through the following formula:

[0122]

[0123] Among them, E represents the radial electric field strength corresponding to the target equivalent circuit, represents the vacuum permittivity, represents the relative permittivity, d represents the radius of the electric field strength corresponding to the target equivalent circuit, represents the weight coefficient of the e-th circuit charge, represents the charge distribution function, e represents the serial number corresponding to the circuit charge, and p represents the number of circuit charges.

[0124] Among them, the externally applied voltage of the circuit is the specific value of the externally applied voltage set or given during the electric field simulation. This value will be recorded in the data file of the simulation results or relevant outputs and can be conveniently extracted through the post-processing function of the simulation software. The relative permittivity represents the dielectric property of the material of the target equivalent circuit. The circuit charge is the electric field source corresponding to the target equivalent circuit, and its quantity, distribution, and motion state determine the generation, distribution, and magnitude of the electric field strength. The weight coefficient reflects the degree of influence of different charge distributions in the circuit charge on the electric field strength and can be determined based on the analysis of the electric field simulation data and experience. The vacuum permittivity is a known physical constant, and its value is approximately 8.854x F / m. The charge distribution function can be derived from the target equivalent circuit model. In some advanced electric field simulation software, different types of charge distribution models can be set, such as uniform distribution, exponential distribution, Gaussian distribution, etc. The parameters and forms of these models will be recorded in the simulation settings. By analyzing the simulation results, especially by analyzing the curve of the electric field strength changing with the radius, the actual distribution of the charge can be determined, and then the specific functional form of the obtained charge distribution function can be obtained.

[0125] According to the radial electric field strength, the present invention evaluates the voltage withstand performance of the corresponding glass fiber sleeve, and can understand that the glass fiber sleeve has good reliability and stability in the corresponding voltage environment, thereby providing a basis for the subsequent analysis of the anti-voltage breakdown test of the glass fiber sleeve. It should be explained that the voltage withstand performance is a description of the reliability and stability of the glass fiber sleeve. Further, the radial electric field strength is compared with a preset threshold. If it is higher than the preset threshold, it means that the voltage withstand performance of the corresponding glass fiber sleeve is high, otherwise it is low.

[0126] S4. During the electric field simulation process, gradually increase the voltage applied to the target equivalent circuit, and at the same time monitor the circuit response characteristics of the target equivalent circuit. When the circuit response characteristics reach the preset breakdown characteristic conditions, it is determined that the target equivalent circuit has a breakdown phenomenon, record the breakdown voltage value corresponding to the breakdown phenomenon, and calculate the sleeve breakdown strength of the glass fiber sleeve in combination with the breakdown voltage value and the specification parameters.

[0127] In the process of electric field simulation of the present invention, the voltage applied to the target equivalent circuit is gradually increased while monitoring the circuit response characteristics of the target equivalent circuit. When the circuit response characteristics reach the preset breakdown characteristic conditions, it is determined that the target equivalent circuit has a breakdown phenomenon, and the breakdown voltage value corresponding to the breakdown phenomenon is recorded. Determining the breakdown phenomenon by monitoring the circuit response characteristics helps to deeply understand the failure mechanism of the bushing under the action of the electric field, thereby indicating the direction for optimizing the bushing material and structural design, ultimately improving the reliability and stability of the fiberglass bushing in a high-voltage environment, ensuring the safe operation of the electrical system, and further providing an important basis for the subsequent calculation of the breakdown strength of the bushing. It should be explained that the circuit response characteristics are the changes in electrical parameters presented by the target equivalent circuit during the gradual increase of the voltage, the preset breakdown characteristic conditions are the critical electrical parameter change states that the circuit response characteristics reach and may cause insulation breakdown, and the breakdown voltage value is the critical voltage magnitude that causes insulation breakdown of the circuit corresponding to the breakdown phenomenon. Further, the monitoring of the circuit response characteristics of the target equivalent circuit can be achieved through professional electrical measuring instruments such as high-precision oscilloscopes and spectrum analyzers, as well as a computer system equipped with a data acquisition card. This system can collect and analyze in real time the changes in parameters such as current, voltage, and power in the circuit over time; the recording of the breakdown voltage value corresponding to the breakdown phenomenon can be achieved through a high-speed data acquisition module connected to the voltage source and a voltage measuring instrument with a triggering function. When it is monitored that the circuit response characteristics reach the preset breakdown conditions, these devices can quickly and accurately capture and store the voltage value at the moment of breakdown, ensuring the accuracy and reliability of the data and providing a key basis for the subsequent calculation of the breakdown strength of the bushing.

[0128] The present invention calculates the bushing breakdown strength of the fiberglass bushing by combining the breakdown voltage value and the specification parameters. The maximum electric field strength that the fiberglass bushing can withstand can be understood through the bushing breakdown strength, thereby laying an important basis for the subsequent anti-voltage breakdown test analysis of the fiberglass bushing. It should be explained that the bushing breakdown strength represents the maximum electric field strength that the fiberglass bushing can withstand.

[0129] Specifically, the combination of the breakdown voltage value and the specification parameters to calculate the bushing breakdown strength of the fiberglass bushing includes:

[0130] Extract the inner diameter, outer diameter, and length of the bushing corresponding to the fiberglass bushing from the specification parameters;

[0131] Combining the inner diameter and the outer diameter of the bushing, the electric field concentration factor corresponding to the fiberglass bushing can be calculated:

[0132]

[0133] Among them, k represents the electric field concentration factor corresponding to the glass fiber sleeve, represents the inner diameter of the sleeve, represents the outer diameter of the sleeve;

[0134] Combining the electric field concentration factor, the breakdown voltage value and the sleeve length, the sleeve breakdown strength of the glass fiber sleeve is calculated through the following formula:

[0135]

[0136] Among them, H represents the sleeve breakdown strength of the glass fiber sleeve, k represents the electric field concentration factor, U represents the breakdown voltage value, L represents the sleeve length, represents the vacuum permittivity.

[0137] It should be explained that the inner diameter of the sleeve, the outer diameter of the sleeve and the sleeve length are respectively the geometric dimension parameters of the glass fiber sleeve in the specification parameters, and the electric field concentration factor is the physical property parameter corresponding to the glass fiber sleeve that reflects the degree of electric field concentration inside it.

[0138] S5. Perform electrical parameter simulation processing on the target equivalent circuit, measure the electrical characteristic parameters during the simulation processing, calculate the active power loss corresponding to the target equivalent circuit based on the electrical characteristic parameters, and combine the sleeve breakdown strength, the withstand voltage performance and the active power loss to perform the anti-voltage breakdown test analysis of the glass fiber sleeve to obtain the breakdown analysis result.

[0139] Based on the electrical characteristic parameters, the active power loss corresponding to the target equivalent circuit is calculated, which can deeply understand the power loss of the target equivalent circuit under different working conditions, and thus provide a key basis for evaluating the circuit performance. It should be noted that the electrical characteristic parameters are physical quantities reflecting the electrical characteristics of the target equivalent circuit during the simulation process, including but not limited to voltage, current, resistance, capacitance, inductance, phase angle, etc. The active power loss directly reflects the efficiency loss of the circuit during the power transmission and conversion process. By calculating and analyzing it, it can be judged whether the working state of the circuit is normal and whether there is potential room for performance optimization. The setting of the preset loss threshold provides a quantitative standard for timely detecting circuit anomalies. When the active power loss exceeds this threshold, it indicates that there may be potential faults or performance degradation in the circuit. At this time, the simulation is stopped and the electrical parameter simulation data is collected for subsequent in-depth analysis of the root cause of the problem. The electrical parameter simulation data is a set of various information related to the circuit performance generated during the electrical parameter simulation process of the target equivalent circuit. Further, the measurement of the electrical characteristic parameters during the simulation process can be achieved by setting virtual measuring instruments (such as high-precision voltage probes, current probes, power analyzers, etc.) in the circuit simulation software, using the built-in algorithms and data acquisition functions of the software to monitor the voltage and current changes at key nodes in the circuit in real time, and calculating other related electrical characteristic parameters such as resistance, capacitance, inductance, phase angle, etc. based on these data; the collection of the electrical parameter simulation data of the target equivalent circuit can be achieved by setting data recording and export functions in the circuit simulation software. During the simulation operation, according to the predetermined time interval or specific event trigger conditions, automatically record the change data of the electrical characteristic parameters such as voltage, current, and power at each node of the circuit over time, as well as the working parameters of the circuit components (such as resistance value changes, capacitor charge and discharge curves, etc.), and export these data in a standardized data format (such as spreadsheets, text files, etc.) at the end of the simulation or when the stop condition is met for subsequent in-depth research and processing using professional data processing and analysis tools, providing a comprehensive data basis for analyzing the circuit performance, diagnosing potential problems, and optimizing the circuit design.

[0140] Specifically, calculating the active power loss corresponding to the target equivalent circuit based on the electrical characteristic parameters includes:

[0141] Extracting the terminal voltage value and terminal current value corresponding to the target equivalent circuit from the electrical characteristic parameters;

[0142] Calculating the cosine parameter of the electrical phase angle between the terminal voltage value and the terminal current value;

[0143] Combining the terminal voltage value, the terminal current value and the cosine parameter of the electrical phase angle, calculating the active power loss corresponding to the target equivalent circuit through the following formula:

[0144]

[0145] Among them, M represents the active power loss corresponding to the target equivalent circuit, represents the terminal voltage value, represents the terminal current value, represents the cosine parameter of the electrical phase angle, represents the power factor.

[0146] It should be explained that the terminal voltage value is the potential difference between the two ends corresponding to the target equivalent circuit, the terminal current value is the charge flow intensity flowing through the two-terminal line corresponding to the target equivalent circuit, and the cosine parameter of the electrical phase angle is the cosine value of the phase difference between the terminal voltage value and the terminal current value, reflecting the degree of correlation in phase and the power factor situation between the two.

[0147] Further, as an optional embodiment of the present invention, calculating the cosine parameter of the electrical phase angle between the terminal voltage value and the terminal current value includes:

[0148] Construct phase diagrams corresponding to the terminal voltage value and the terminal current value respectively to obtain a voltage phase diagram and a current phase diagram;

[0149] Perform a merging process on the voltage phase diagram and the current phase diagram to obtain a merged phase diagram;

[0150] Identify the voltage zero-crossing point and the current zero-crossing point in the merged phase diagram;

[0151] Combining the voltage zero-crossing point and the current zero-crossing point, the cosine parameter of the electrical phase angle between the terminal voltage value and the terminal current value can be calculated through the following formula:

[0152]

[0153] Among them, represents the cosine parameter of the electrical phase angle between the terminal voltage value and the terminal current value, represents the current zero-crossing point, represents the voltage zero-crossing point, and T represents the phase period of the merged phase diagram.

[0154] Among them, the voltage phase diagram and the current phase diagram are respectively graphs showing the phase information of the voltage / current changing with time, with time as the horizontal axis and the voltage / current amplitude as the vertical axis, corresponding to the end - path voltage value and the end - path current value; the combined phase diagram is a graph obtained by combining the voltage phase diagram and the current phase diagram in the same coordinate system, used to visually compare the phase relationship between the voltage and the current; the voltage zero - crossing point and the current zero - crossing point are respectively the time points when the voltage and current waveforms in the combined phase diagram cross the horizontal axis (voltage / current value is zero) from negative to positive or from positive to negative; the phase period is the time span corresponding to a complete phase - change cycle of the voltage or current in the combined phase diagram.

[0155] Furthermore, the phase diagrams corresponding to the end - path voltage value and the end - path current value can be respectively constructed by using the mathematical expressions (such as sine - function expressions) of the end - path voltage value and the end - path current value to calculate the amplitudes corresponding to different time points, and plotting data points with time as the horizontal axis and amplitude as the vertical axis and connecting them with curves, or directly plotting according to the measured data of the voltage and current changing with time, to obtain the voltage phase diagram and the current phase diagram; the voltage phase diagram and the current phase diagram can be combined by strictly aligning the coordinate axes (time axis and amplitude axis) of the two phase diagrams and plotting the voltage and current waveforms in the same coordinate system (by means of differentiating colors, line types, etc.) to obtain the combined phase diagram; the voltage zero - crossing point and the current zero - crossing point in the combined phase diagram can be identified by manually observing the intersection points of the waveforms with the horizontal axis (the axis where the voltage / current value is zero) or by using a detection algorithm written in computer software; the phase period can be obtained by finding any point (such as a peak point, a zero - crossing point and other characteristic points) on the voltage or current waveform in the combined phase diagram and observing the position where this point first repeats on the subsequent time axis. The time interval from the initial position to the first repeated position is the phase period.

[0156] The present invention performs the anti-voltage breakdown test analysis of the glass fiber sleeve by combining the breakdown strength of the sleeve, the withstand voltage performance, and the active power loss, thereby improving the accuracy of the anti-voltage breakdown test of the glass fiber sleeve. Further, first, the potential of the glass fiber sleeve to resist voltage breakdown is preliminarily evaluated according to the level of the sleeve breakdown strength. The higher the strength, the greater the possibility of withstanding high voltage without breakdown. Consider the level of the withstand voltage performance. Good performance means that it can maintain a stable insulation state under the action of voltage for a long time. Analyze the level of the active power loss. A higher power loss may imply problems such as abnormal heating inside the sleeve, affecting its insulation performance and long-term stability. In the anti-voltage breakdown test analysis, by comprehensively considering the parameter performance of these three aspects, the safety and reliability of the glass fiber sleeve under different voltage conditions are comprehensively judged, so as to obtain accurate test analysis results, providing a key basis for its applicability in actual power transmission and other application scenarios.

[0157] Compared with the problems described in the background art, the present invention calculates the quality index value corresponding to the glass fiber sleeve based on the production process data, and can understand the product quality corresponding to the glass fiber sleeve through the quality index value, improving the construction accuracy of the subsequent equivalent product model. Further, the present invention constructs the equivalent circuit model corresponding to the glass fiber sleeve by combining the quality index value, the internal structure, the external shape, and the product standard information, and can obtain the electrical performance equivalent model of the glass fiber sleeve for subsequent operations such as electric field simulation. The present invention calculates the radial electric field intensity corresponding to the target equivalent circuit according to the electric field simulation data, can quantify the distribution of the electric field around the circuit model, and evaluates the withstand voltage performance corresponding to the glass fiber sleeve based on the radial electric field intensity, thereby judging the insulation ability and the withstand voltage level of the glass fiber sleeve in the electric field environment. Further, in the process of electric field simulation, the present invention gradually increases the voltage applied to the target equivalent circuit while monitoring the circuit response characteristics of the target equivalent circuit. When the circuit response characteristics reach the preset breakdown characteristic conditions, it is determined that the target equivalent circuit has a breakdown phenomenon, and the breakdown voltage value corresponding to the breakdown phenomenon is recorded. Judging the breakdown phenomenon by monitoring the circuit response characteristics helps to deeply understand the failure mechanism of the sleeve under the action of the electric field, thus indicating the direction for optimizing the sleeve material and structural design, ultimately improving the reliability and stability of the glass fiber sleeve in the high-voltage environment, ensuring the safe operation of the electrical system, and further providing an important basis for the subsequent calculation of the breakdown strength of the sleeve. Further, the present invention calculates the active power loss corresponding to the target equivalent circuit based on the electrical characteristic parameters, can deeply understand the power loss situation of the target equivalent circuit under different working conditions, and further provides a key basis for evaluating the circuit performance. Therefore, the voltage breakdown prevention test method and system based on the glass fiber sleeve provided by the embodiments of the present invention can improve the accuracy of the voltage breakdown prevention test of the glass fiber sleeve.

[0158] Embodiment 2:

[0159] As Figure 2 shown, it is a functional module diagram of a voltage breakdown prevention test system based on a glass fiber sleeve according to the present invention.

[0160] The anti-voltage breakdown test system 200 based on a glass fiber sleeve described in the present invention can be installed in an electronic device. According to the functions achieved, the anti-voltage breakdown test system based on the glass fiber sleeve may include an index value calculation module 201, an electric field simulation processing module 202, a withstand voltage performance evaluation module 203, a sleeve breakdown strength calculation module 204, and a breakdown test analysis module 205. The modules described in the present invention may also be referred to as units, which refer to a series of computer program segments that can be executed by a processor of an electronic device and can complete fixed functions, and are stored in the memory of the electronic device.

[0161] In the embodiment of the present invention, the functions of each module / unit are as follows:

[0162] The index value calculation module 201 is used to obtain the specification parameters of the glass fiber sleeve to be tested, collect the production process data of the glass fiber sleeve, calculate the corresponding quality index value of the glass fiber sleeve based on the production process data, and query the product standard information corresponding to the glass fiber sleeve;

[0163] The electric field simulation processing module 202 is used to identify the internal structure and external shape corresponding to the glass fiber sleeve, construct an equivalent circuit model corresponding to the glass fiber sleeve in combination with the quality index value, the internal structure, the external shape, and the product standard information, perform pre-processing of electric field simulation on the equivalent circuit model to obtain a target equivalent circuit, and perform electric field simulation processing on the target equivalent circuit to obtain electric field simulation data;

[0164] The withstand voltage performance evaluation module 203 is used to calculate the radial electric field intensity corresponding to the target equivalent circuit according to the electric field simulation data, and evaluate the withstand voltage performance corresponding to the glass fiber sleeve based on the radial electric field intensity;

[0165] The sleeve breakdown strength calculation module 204 is used to gradually increase the voltage applied to the target equivalent circuit during the electric field simulation process, and simultaneously monitor the circuit response characteristics of the target equivalent circuit. When the circuit response characteristics reach the preset breakdown characteristic conditions, it is determined that the target equivalent circuit has a breakdown phenomenon, record the breakdown voltage value corresponding to the breakdown phenomenon, and calculate the sleeve breakdown strength of the glass fiber sleeve in combination with the breakdown voltage value and the specification parameters;

[0166] The breakdown test analysis module 205 is configured to perform electrical parameter simulation processing on the target equivalent circuit, measure the electrical characteristic parameters during the simulation processing, calculate the active power loss corresponding to the target equivalent circuit based on the electrical characteristic parameters, and perform the anti-voltage breakdown test analysis of the glass fiber sleeve in combination with the sleeve breakdown strength, the withstand voltage performance, and the active power loss, so as to obtain a breakdown analysis result.

[0167] Specifically, each module in the anti-voltage breakdown test system 200 based on a glass fiber sleeve in the embodiments of the present invention adopts the same technical means as those in the Figure 1 anti-voltage breakdown test method based on a glass fiber sleeve described above, and can produce the same technical effects, which will not be elaborated here.

[0168] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms.

[0169] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for testing voltage breakdown of glass fiber casing, characterized in that: The method comprises: Obtaining specification parameters of the glass fiber sleeve to be tested, collecting production process data of the glass fiber sleeve, calculating the quality index value corresponding to the glass fiber sleeve based on the production process data, and querying the product standard information corresponding to the glass fiber sleeve; Identify the internal structure and external shape corresponding to the glass fiber sleeve, construct an equivalent circuit model corresponding to the glass fiber sleeve in combination with the quality index value, the internal structure, the external shape and the product standard information, perform electric field simulation pre-processing on the equivalent circuit model to obtain a target equivalent circuit, perform electric field simulation processing on the target equivalent circuit to obtain electric field simulation data; According to the electric field simulation data, the radial electric field intensity corresponding to the target equivalent circuit is calculated, and according to the radial electric field intensity, the voltage withstand performance corresponding to the glass fiber casing is evaluated, wherein, according to the electric field simulation data, the radial electric field intensity corresponding to the target equivalent circuit is calculated, including: Based on the electric field simulation data, determining a circuit applied voltage and a relative dielectric constant corresponding to the target equivalent circuit; Detecting a circuit charge corresponding to the target equivalent circuit, and assigning a weight coefficient corresponding to the circuit charge; Combining the circuit applied voltage, the relative dielectric constant, the circuit charge and the weight coefficient, the radial electric field intensity corresponding to the target equivalent circuit is calculated by the following formula: Where E represents the radial electric field strength corresponding to the target equivalent circuit, Represents the voltage applied to the circuit. is the dielectric constant of vacuum, represents the relative dielectric constant, d represents the electric field strength radius corresponding to the target equivalent circuit, represents the weight coefficient of the e-th circuit charge, represents the charge distribution function, e represents the serial number corresponding to the circuit charge, and p represents the number of circuit charges; During the electric field simulation process, the voltage applied to the target equivalent circuit is gradually increased, and the circuit response characteristics of the target equivalent circuit are monitored at the same time. When the circuit response characteristics reach a preset breakdown characteristic condition, it is determined that the target equivalent circuit has a breakdown phenomenon, and the breakdown voltage value corresponding to the breakdown phenomenon is recorded. The breakdown voltage value and the specification parameters are combined to calculate the sleeve breakdown strength of the glass fiber sleeve; The target equivalent circuit is subjected to electrical parameter simulation processing, and the electrical characteristic parameters in the simulation process are measured. Based on the electrical characteristic parameters, the active power loss corresponding to the target equivalent circuit is calculated. In combination with the bushing breakdown strength, the voltage resistance performance and the active power loss, the voltage breakdown protection test analysis of the glass fiber bushing is performed to obtain a breakdown analysis result.

2. The voltage breakdown protection test method based on glass fiber casing according to claim 1, characterized in that: The step of calculating the quality index value corresponding to the glass fiber sleeve based on the production process data includes: Query the quality evaluation standard corresponding to the glass fiber sleeve, and analyze the data feature attributes corresponding to the production process data; Calculating the fit coefficient between the quality evaluation standard and the data feature attribute; extracting quality evaluation data from the production process data according to the fit coefficient; Calculating the data association strength between the quality evaluation data and other data in the production process data; Based on the data association strength, filtering out quality-related data from the production process data; The quality index value corresponding to the glass fiber sleeve is calculated by combining the quality evaluation data and the quality association data.

3. The voltage breakdown protection test method based on glass fiber casing according to claim 2, characterized in that: The calculating the fit coefficient between the quality evaluation standard and the data feature attribute includes: Calculating the influence weight between the quality evaluation standard and the data feature attribute; Querying the standard reference value corresponding to the quality assessment standard, and extracting the actual data value corresponding to the data feature attribute; Combine the standard reference value and the actual value of the data to calculate the average values ​​corresponding to the quality evaluation standard and the data characteristic attribute, respectively, to obtain the standard average value and the data average value; Combining the impact weight, the standard reference value, the actual value of the data, the standard average value and the data average value, the fit coefficient between the quality evaluation standard and the data feature attribute is calculated by the following formula: Among them, A represents the fit coefficient between the quality evaluation standard and the data feature attributes, represents the influence weight between the ath quality evaluation criterion and the bth data feature attribute, represents the standard reference value corresponding to the ath quality evaluation standard, represents the standard average value, Indicates the standard deviation corresponding to the standard reference value, Indicates the actual value of the data corresponding to the bth data feature attribute, Represents the average value of the data. It represents the standard deviation corresponding to the actual value of the data, a represents the serial number of the quality evaluation standard, x represents the number of the quality evaluation standard, b represents the serial number of the data feature attribute, and y represents the number of the data feature attribute.

4. The voltage breakdown protection test method based on glass fiber casing according to claim 1, characterized in that: The step of combining the quality index value, the internal structure, the external shape and the product standard information to construct an equivalent circuit model corresponding to the glass fiber sleeve includes: Extracting electrical parameter information and physical dimension data of the glass fiber casing from the product standard information; constructing an initial circuit model of the glass fiber sleeve according to the electrical parameter information, the physical dimension data, the internal structure and the external shape; Querying material performance information corresponding to the internal structure, and analyzing electrical properties of the material corresponding to the internal structure based on the material performance information; According to the quality index value and the electrical characteristics of the material, the initial circuit model is subjected to parameter adjustment processing to obtain an equivalent circuit model corresponding to the glass fiber sleeve.

5. The voltage breakdown protection test method based on glass fiber casing according to claim 1, characterized in that: The performing electric field simulation pre-processing on the equivalent circuit model to obtain a target equivalent circuit includes: Simplifying the equivalent circuit model to obtain a simplified equivalent circuit model; Analyzing the circuit topology of the simplified equivalent circuit model and calculating the circuit complexity of the circuit topology; Determining a circuit analysis method applicable to the simplified equivalent circuit model according to the complexity index; Identifying the electric field sensitive point domain of the simplified equivalent circuit model; Based on the circuit analysis method and the electric field sensitive point domain, circuit element parameter optimization and node setting processing are performed on the simplified equivalent circuit model to obtain a target equivalent circuit.

6. The voltage breakdown protection test method based on glass fiber casing according to claim 1, characterized in that: The step of calculating the bushing breakdown strength of the glass fiber bushing by combining the breakdown voltage value and the specification parameter comprises: Extracting the inner diameter, outer diameter and length of the glass fiber sleeve from the specification parameters; Combining the inner diameter of the sleeve and the outer diameter of the sleeve, the electric field bundling factor corresponding to the glass fiber sleeve is calculated: Where k represents the electric field bundling factor corresponding to the glass fiber casing, Indicates the inner diameter of the casing. Indicates the outer diameter of the casing; Combining the electric field bundling factor, the breakdown voltage value and the sleeve length, the sleeve breakdown strength of the glass fiber sleeve is calculated by the following formula: Among them, H represents the breakdown strength of the glass fiber casing, k represents the electric field bundling factor, U represents the breakdown voltage value, and L represents the casing length. represents the dielectric constant of vacuum.

7. The voltage breakdown protection test method based on glass fiber casing according to claim 1, characterized in that: The calculating, based on the electrical characteristic parameters, the active power loss corresponding to the target equivalent circuit comprises: Extracting terminal voltage values ​​and terminal current values ​​corresponding to the target equivalent circuit from the electrical characteristic parameters; Calculating a cosine parameter of an electrical phase angle between the terminal voltage value and the terminal current value; Combined with the terminal voltage value, the terminal current value and the electrical phase angle cosine parameter, the active power loss corresponding to the target equivalent circuit is calculated by the following formula: Where M represents the active power loss corresponding to the target equivalent circuit, Indicates the terminal voltage value, Indicates the terminal current value, represents the electrical phase angle cosine parameter, Indicates the power factor.

8. The voltage breakdown protection test method based on glass fiber casing according to claim 7, characterized in that: The calculating of the electrical phase angle cosine parameter between the terminal voltage value and the terminal current value comprises: Constructing phase diagrams corresponding to the terminal voltage value and the terminal current value respectively to obtain a voltage phase diagram and a current phase diagram; Combining the voltage phase diagram and the current phase diagram to obtain a combined phase diagram; identifying voltage zero crossings and current zero crossings in the combined phase diagram; In combination with the voltage zero crossing point and the current zero crossing point, the electrical phase angle cosine parameter between the terminal voltage value and the terminal current value is calculated by the following formula: in, It represents the cosine parameter of the electrical phase angle between the terminal voltage value and the terminal current value. Indicates the current zero crossing point, represents the voltage zero crossing point, and T represents the phase period of the combined phase diagram.

9. A voltage breakdown protection test system based on glass fiber casing, characterized in that: The system comprises: An index value calculation module, used to obtain specification parameters of the glass fiber sleeve to be tested, collect production process data of the glass fiber sleeve, calculate the quality index value corresponding to the glass fiber sleeve based on the production process data, and query the product standard information corresponding to the glass fiber sleeve; An electric field simulation processing module is used to identify the internal structure and external shape corresponding to the glass fiber sleeve, and to construct an equivalent circuit model corresponding to the glass fiber sleeve in combination with the quality index value, the internal structure, the external shape and the product standard information, to perform electric field simulation pre-processing on the equivalent circuit model to obtain a target equivalent circuit, and to perform electric field simulation processing on the target equivalent circuit to obtain electric field simulation data; A voltage resistance performance evaluation module is used to calculate the radial electric field strength corresponding to the target equivalent circuit according to the electric field simulation data, and evaluate the voltage resistance performance corresponding to the glass fiber sleeve according to the radial electric field strength, wherein the radial electric field strength corresponding to the target equivalent circuit is calculated according to the electric field simulation data, including: Based on the electric field simulation data, determining a circuit applied voltage and a relative dielectric constant corresponding to the target equivalent circuit; Detecting a circuit charge corresponding to the target equivalent circuit, and assigning a weight coefficient corresponding to the circuit charge; Combining the circuit applied voltage, the relative dielectric constant, the circuit charge and the weight coefficient, the radial electric field intensity corresponding to the target equivalent circuit is calculated by the following formula: Where E represents the radial electric field strength corresponding to the target equivalent circuit, Represents the voltage applied to the circuit. is the dielectric constant of vacuum, represents the relative dielectric constant, d represents the electric field strength radius corresponding to the target equivalent circuit, represents the weight coefficient of the e-th circuit charge, represents the charge distribution function, e represents the serial number corresponding to the circuit charge, and p represents the number of circuit charges; A bushing breakdown strength calculation module is used to gradually increase the voltage applied to the target equivalent circuit during the electric field simulation process, and monitor the circuit response characteristics of the target equivalent circuit at the same time. When the circuit response characteristics reach a preset breakdown characteristic condition, it is determined that the target equivalent circuit has a breakdown phenomenon, and the breakdown voltage value corresponding to the breakdown phenomenon is recorded. In combination with the breakdown voltage value and the specification parameters, the bushing breakdown strength of the glass fiber bushing is calculated; The breakdown test analysis module is used to perform electrical parameter simulation processing on the target equivalent circuit and measure the electrical characteristic parameters during the simulation process. Based on the electrical characteristic parameters, the active power loss corresponding to the target equivalent circuit is calculated. In combination with the bushing breakdown strength, the voltage resistance performance and the active power loss, the voltage protection breakdown test analysis of the glass fiber bushing is performed to obtain a breakdown analysis result.

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