Voltage breakdown prevention test method and system based on glass fiber sleeve

Abstract

The invention relates to the technical field of electrical insulation testing, and discloses a voltage breakdown prevention testing method and system based on a glass fiber sleeve, and the method comprises the steps: calculating a quality index value corresponding to the glass fiber sleeve, constructing an equivalent circuit model corresponding to the glass fiber sleeve, carrying out the electric field simulation preprocessing of the equivalent circuit model, and obtaining a voltage breakdown prevention result. Obtaining a target equivalent circuit, and performing electric field simulation processing on the target equivalent circuit to obtain electric field simulation data; the radial electric field intensity corresponding to the target equivalent circuit is calculated, and the voltage resistance corresponding to the glass fiber sleeve is evaluated; calculating the casing breakdown strength of the glass fiber casing; electrical parameter simulation processing is conducted on the target equivalent circuit, electrical characteristic parameters in the simulation processing process are measured, active power loss corresponding to the target equivalent circuit is calculated, voltage breakdown prevention test analysis of the glass fiber sleeve is executed, and a breakdown analysis result is obtained. According to the invention, the accuracy of the voltage breakdown prevention test of the glass fiber sleeve can be improved.

Description

Technical Field

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

[0002] As an important insulating component in electrical equipment, glass fiber casing is widely used in power systems, electronic equipment and other fields. Its insulation performance is directly related to the safe and stable operation of the equipment. With the continuous development of the power industry, the reliability and safety requirements of electrical equipment are increasing. The voltage breakdown performance test of glass fiber casing is becoming more and more important.

[0003] At present, the test methods for glass fiber casing mainly focus on the measurement of its basic electrical parameters, such as insulation resistance, dielectric constant, etc. These traditional test methods can reflect the insulation performance of the casing to a certain extent, but there are limitations in the evaluation of the anti-voltage breakdown characteristics of the casing in a complex electric field environment. When evaluating the anti-voltage breakdown performance of glass fiber casing, the existing test technology lacks in-depth research on the microstructure changes and charge-related characteristics inside the casing. In actual operation, the uneven electric field distribution, partial discharge and space charge accumulation inside the casing will gradually lead to the decline of the insulation performance of the casing, and eventually cause a voltage breakdown accident. However, it is difficult for the existing test methods to accurately capture these microscopic changes and cannot comprehensively evaluate the anti-voltage breakdown performance of the casing, which in turn reduces the accuracy of the anti-voltage breakdown test of the glass fiber casing. Summary of the invention

[0004] The present invention provides a method and system for testing voltage breakdown prevention of glass fiber casings, the main purpose of which is to solve the problem of reduced accuracy of voltage breakdown prevention testing of glass fiber casings.

[0005] To achieve the above object, the present invention provides a method for testing voltage breakdown protection based on a glass fiber casing, comprising: 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 resistance performance corresponding to the glass fiber casing is evaluated; 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.

[0006] Optionally, the 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.

[0007] Optionally, 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.

[0008] Optionally, the combining of 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.

[0009] Optionally, 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.

[0010] Optionally, calculating the radial electric field intensity corresponding to the target equivalent circuit according to the electric field simulation data includes: 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 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, 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 amount of circuit charge.

[0011] Optionally, the calculating the bushing breakdown strength of the glass fiber bushing by combining the breakdown voltage value and the specification parameter includes: 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 can be 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.

[0012] Optionally, the calculating, based on the electrical characteristic parameters, the active power loss corresponding to the target equivalent circuit includes: 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 cosine parameter of the electrical phase angle, Indicates the power factor.

[0013] Optionally, the calculating of the electrical phase angle cosine parameter between the terminal voltage value and the terminal current value includes: 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 can be 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.

[0014] In order to solve the above problems, the present invention also provides a voltage breakdown protection test system based on a glass fiber casing, the system comprising: 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, 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 casing according to the radial electric field strength; 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.

[0015] Compared with the problem described in the background technology, the present invention calculates the quality index value corresponding to the glass fiber sleeve based on the production process data, and the product quality corresponding to the glass fiber sleeve can be understood through the quality index value, thereby improving the accuracy of constructing subsequent equivalent product models. Furthermore, the present invention constructs 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, and can obtain an electrical performance equivalent model of the glass fiber sleeve for subsequent electric field simulation and other operations. The present invention calculates the radial electric field strength corresponding to the target equivalent circuit based on the electric field simulation data, and can quantify the distribution of the electric field around the circuit model. According to the radial electric field strength, the voltage resistance performance corresponding to the glass fiber sleeve is evaluated, thereby judging the insulation capacity and voltage resistance level of the glass fiber sleeve in an electric field environment. Furthermore The present invention gradually increases the voltage applied to the target equivalent circuit during the electric field simulation process, and monitors the circuit response characteristics of the target equivalent circuit at the same time. When the circuit response characteristics reach the preset breakdown characteristic conditions, the target equivalent circuit is determined to have a breakdown phenomenon, and the breakdown voltage value corresponding to the breakdown phenomenon is recorded. The breakdown phenomenon is determined by monitoring the circuit response characteristics, which helps to deeply understand the failure mechanism of the bushing under the action of the electric field, thereby pointing out the direction for optimizing the bushing material and structural design, and ultimately improving the reliability and stability of the glass fiber bushing under 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. Furthermore, the present invention calculates the active power loss corresponding to the target equivalent circuit based on the electrical characteristic parameters, which can deeply understand the power loss of the target equivalent circuit under different working conditions, and further provide a key basis for evaluating circuit performance. Therefore, the anti-voltage breakdown test method and system based on the glass fiber bushing provided in the embodiment of the present invention can improve the accuracy of the anti-voltage breakdown test of the glass fiber bushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic flow chart of a method for testing voltage breakdown resistance of a glass fiber casing according to an embodiment of the present invention; Figure 2 A schematic diagram of a module for implementing the glass fiber casing-based voltage breakdown protection test method provided in an embodiment of the present invention.

[0017] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0018] 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.

[0019] The embodiment of the present application provides a method for testing voltage breakdown based on glass fiber casing. The execution subject of the method for testing voltage breakdown based on glass fiber casing includes but is not limited to at least one of the electronic devices such as a server and a terminal that can be configured to execute the method provided by the embodiment of the present application. In other words, the method for testing voltage breakdown based on glass fiber casing can be executed by software or hardware installed in 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.

[0020] Embodiment 1: Reference Figure 1 FIG. 1 is a flow chart of a method for testing voltage breakdown resistance based on a glass fiber casing according to an embodiment of the present invention. In this embodiment, the method for testing voltage breakdown resistance based on a glass fiber casing includes: S1. Obtain specification parameters of the glass fiber sleeve to be tested, collect production process data of the glass fiber sleeve, calculate quality index values ​​corresponding to the glass fiber sleeve based on the production process data, and query product standard information corresponding to the glass fiber sleeve.

[0021] 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, thereby improving the accuracy of constructing a subsequent equivalent product model.

[0022] It should be explained that the fiberglass sheathing is a kind of pipe commonly used in electrical insulation and other fields. The specification parameters are the standard parameter requirements set for the fiberglass sheathing in terms of size, performance, etc. The production process data are the record data of various process conditions of the fiberglass sheathing in the production process. The quality index value is the quantitative characterization value of the quality corresponding to the fiberglass sheathing. The product standard information is the specification description information corresponding to the fiberglass sheathing. Furthermore, the collection of the production process data of the fiberglass sheathing can be achieved through the monitoring equipment on the production line, such as temperature sensors, humidity sensors and flow sensors, etc.; the query of the product standard information corresponding to the fiberglass sheathing can be obtained by consulting the relevant industry standard documents.

[0023] In detail, the calculating of 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.

[0024] Among them, the quality evaluation standard is the quality measurement criterion corresponding to the glass fiber sleeve, the data feature 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 feature attribute, the quality evaluation data is the data in the production process data that is directly related to the quality, the data association strength represents the degree of association between the quality evaluation data and other data in the production process data, and the quality-related data is data in other data in the production process data that has an association relationship with the quality evaluation data.

[0025] Furthermore, the quality evaluation standard corresponding to the glass fiber sleeve can be obtained by querying from an established 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; the fit coefficient is compared with the preset fit coefficient, and when the fit coefficient is greater than the preset fit coefficient (the preset fit coefficient can be set to 0.7, and can also be adjusted according to the actual application scenario), the 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 corresponding to the data correlation strength, the correlation 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 quantified to obtain data quantization values, and the data quantization values ​​corresponding to each quality indicator are added to obtain the quality indicator value corresponding to the glass fiber sleeve.

[0026] Further, as an optional embodiment of the present invention, 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.

[0027] Among them, the influence weight represents the degree of mutual influence between the quality assessment standard and the data characteristic attribute, the standard reference value is the established value corresponding to the quality assessment standard, and the actual data value is the actual presented value corresponding to the data characteristic attribute. Furthermore, the calculation of the influence weight between the quality assessment standard and the data characteristic attribute can be achieved through the ReliefF algorithm, and the importance score between the quality assessment standard and the data characteristic attribute is calculated, and the importance score is used as the influence weight; the standard reference value corresponding to the quality assessment standard can be obtained by referring to the product quality specification document; the extraction of the actual data value corresponding to the data characteristic 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 Python; the standard deviation corresponding to the standard reference value can be calculated by combining the corresponding standard reference value and the standard average value through a variance calculation formula; the standard deviation corresponding to the actual data value is calculated in the same principle as the standard deviation corresponding to the standard reference value, and no further details will be given here.

[0028] S2. Identify the internal structure and external shape corresponding to the glass fiber casing, and construct an equivalent circuit model corresponding to the glass fiber casing 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, and perform electric field simulation processing on the target equivalent circuit to obtain electric field simulation data.

[0029] The present invention constructs 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, and can obtain an equivalent model of the electrical performance of the glass fiber sleeve 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 lining and other structural conditions inside the glass fiber sleeve, and the external shape covers the length, outer diameter, inner diameter, curvature and other geometric characteristics of the glass fiber sleeve. The equivalent circuit model is a circuit model for simulating the electrical characteristics of the glass fiber sleeve. Furthermore, the internal structure and external shape corresponding to the glass fiber sleeve can be obtained by high-precision industrial CT scanning technology or three-dimensional laser scanning equipment.

[0030] In detail, the equivalent circuit model corresponding to the glass fiber sleeve is constructed by combining the quality index value, the internal structure, the external shape and the product standard information, including: 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.

[0031] Among them, the electrical parameter information includes data such as the dielectric constant and conductivity of the glass fiber sheath, the physical size data refers to its length, diameter and other size information, the initial circuit model is the basis for constructing an equivalent circuit model, the material performance information is the performance description information corresponding to the internal structure, such as dielectric properties and conductive properties, and the material electrical properties are the electrical performance of the internal structure material, such as resistance properties, capacitance properties, etc.

[0032] Furthermore, the construction of the initial circuit model of the glass fiber sheath can utilize circuit design software, such as AltiumDesigner, etc.; the material performance information corresponding to the internal structure can be obtained by querying the material science database or the technical data provided by the manufacturer; according to the quality index value and the electrical properties of the material, for glass fiber sheaths of different quality grades, different parameter correction methods are used to adjust the resistance, capacitance and other component parameters 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 difference.

[0033] The present invention improves the accuracy and reliability of subsequent electric field simulation of the equivalent circuit model by performing electric field simulation pre-processing on the equivalent circuit model. It should be explained that the target equivalent circuit is a circuit model that is suitable for electric field simulation after the equivalent circuit model is pre-processed.

[0034] In detail, 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.

[0035] Among them, the simplified equivalent circuit model is a circuit model obtained by removing minor components and connections in the equivalent circuit model that have little impact on the electric field simulation results. The circuit topology structure 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 structure. The circuit analysis method includes but is not limited to the node voltage method, the loop current method, etc. The electric field sensitive point domain refers to the location where the voltage and current change significantly under the action of the electric field or have an important influence on the overall electric field distribution.

[0036] Furthermore, the simplification of the equivalent circuit model can be carried out according to the circuit equivalence principle and empirical rules; the circuit topology structure analysis of the simplified equivalent circuit model can be realized by a graph theory algorithm; the circuit complexity can be obtained by calculating the number of nodes, the number of branches and the number of component types in the circuit; the circuit analysis method is selected according to the circuit complexity, such as the node voltage method can be used when the complexity is low, and a more complex hybrid analysis method may be required when the complexity is high; the electric field sensitive point domain of the simplified equivalent circuit model can be identified by performing a preliminary electric field distribution simulation analysis on the circuit and observing the positions with larger voltage and current change gradients; based on the selected circuit analysis method and the identified electric field sensitive point domain, the relevant circuit element parameters are fine-tuned and optimized, and the node attributes and initial conditions are reasonably set to obtain the target equivalent circuit.

[0037] The present invention can obtain the electrical performance data of the target equivalent circuit under different electric field conditions by performing electric field simulation processing on the target equivalent circuit, thereby facilitating the subsequent calculation and analysis of parameters such as electric field strength and electric flux, wherein the electric field simulation data is the corresponding output result and recorded simulation process data when the target equivalent circuit is subjected to electric field simulation processing. Furthermore, the electric field simulation processing of the target equivalent circuit can be implemented by professional electric field simulation software, such as COMSOL Multiphysics.

[0038] S3. Calculate the radial electric field intensity corresponding to the target equivalent circuit according to the electric field simulation data, and evaluate the voltage resistance performance corresponding to the glass fiber casing according to the radial electric field intensity.

[0039] The present invention calculates the radial electric field strength corresponding to the target equivalent circuit based on the electric field simulation data, and can quantify the distribution of the electric field around the circuit model. According to the radial electric field strength, the voltage resistance performance corresponding to the glass fiber sleeve is evaluated, thereby judging the insulation capacity and the withstand voltage level of the glass fiber sleeve in the electric field environment. Furthermore, the radial electric field strength represents the electric field strength component in the direction perpendicular to the axis of the glass fiber sleeve. The magnitude of the radial electric field strength directly affects the voltage resistance performance of the glass fiber sleeve. Generally speaking, the lower the radial electric field strength, the better the voltage resistance performance of the glass fiber sleeve.

[0040] In detail, the calculating the radial electric field intensity corresponding to the target equivalent circuit according to the electric field simulation data includes: 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 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, 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 amount of circuit charge.

[0041] Among them, the circuit applied voltage is the specific value of the applied voltage set or given when performing electric field simulation. This value will be recorded in the data file or related output of the simulation result, and can be easily extracted through the post-processing function of the simulation software. The relative dielectric constant represents the dielectric properties of the material of the target equivalent circuit. The circuit charge is the electric field source corresponding to the target equivalent circuit. Its quantity, distribution and motion state determine the generation, distribution and strength of the electric field. The weight coefficient reflects the degree of influence of different charge distributions in the circuit charge on the electric field strength, which can be determined based on the analysis and experience of the electric field simulation data. The vacuum dielectric constant 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 the curve of the electric field strength changing with the radius, the actual distribution of the charge can be determined, and then the specific function form of the charge distribution function can be obtained.

[0042] By evaluating the voltage resistance performance corresponding to the glass fiber sheathing according to the radial electric field strength, the present invention can understand that the glass fiber sheathing has good reliability and stability under the corresponding voltage environment, thereby providing a basis for the subsequent anti-voltage breakdown test analysis of the glass fiber sheathing. It should be explained that the voltage resistance performance is a description of the reliability and stability of the glass fiber sheathing. Furthermore, the radial electric field strength is compared with a preset threshold value. If it is higher than the preset threshold value, it indicates that the voltage resistance performance corresponding to the glass fiber sheathing is high, otherwise it is low.

[0043] S4. During the electric field simulation process, the voltage applied to the target equivalent circuit is gradually increased while the circuit response characteristics of the target equivalent circuit are monitored. When the circuit response characteristics reach a preset breakdown characteristic condition, it is determined that a breakdown phenomenon occurs in the target equivalent circuit, and the breakdown voltage value corresponding to the breakdown phenomenon is recorded. The breakdown strength of the glass fiber casing is calculated by combining the breakdown voltage value and the specification parameters.

[0044] The present invention gradually increases the voltage applied to the target equivalent circuit during the electric field simulation process, and monitors 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. Determining the breakdown phenomenon by monitoring the circuit response characteristics helps to gain a deep understanding of the failure mechanism of the bushing under the action of the electric field, thereby providing a direction for optimizing the bushing material and structural design, and ultimately improving the reliability and stability of the glass fiber 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 bushing breakdown strength. It should be explained that the circuit response characteristics are the changes in electrical parameters of the target equivalent circuit during the gradual increase in voltage, and the preset breakdown characteristic condition is the circuit response characteristics reaching The critical electrical parameter change state that may cause insulation breakdown, the breakdown voltage value is the critical voltage corresponding to the breakdown phenomenon that causes insulation breakdown in the circuit. Furthermore, the monitoring of the circuit response characteristics of the target equivalent circuit can be achieved by professional electrical measuring instruments such as high-precision oscilloscopes and spectrum analyzers and a computer system equipped with a data acquisition card. The system can collect and analyze the changes of parameters such as current, voltage, power in the circuit over time in real time; the recording of the breakdown voltage value corresponding to the breakdown phenomenon can be achieved by a high-speed data acquisition module connected to a voltage source and a voltage measuring instrument with a trigger 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 casing.

[0045] The present invention calculates the sleeve breakdown strength of the glass fiber sleeve by combining the breakdown voltage value and the specification parameters. The maximum electric field strength that the glass fiber sleeve can withstand can be understood through the sleeve breakdown strength, thereby laying an important basis for the subsequent voltage breakdown test analysis of the glass fiber sleeve. It should be explained that the sleeve breakdown strength represents the maximum electric field strength that the glass fiber sleeve can withstand.

[0046] In detail, the calculation of the bushing breakdown strength of the glass fiber bushing by combining the breakdown voltage value and the specification parameter includes: 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 can be 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.

[0047] It should be explained that the inner diameter of the sleeve, the outer diameter of the sleeve and the length of the sleeve are respectively the geometric size parameters of the glass fiber sleeve in the specification parameters, and the electric field bundling factor is the physical characteristic parameter corresponding to the glass fiber sleeve that reflects the degree of concentration of the electric field inside it.

[0048] S5. Perform electrical parameter simulation on the target equivalent circuit and measure the electrical characteristic parameters during the simulation process. Based on the electrical characteristic parameters, calculate the active power loss corresponding to the target equivalent circuit. Combined with the bushing breakdown strength, the voltage resistance performance and the active power loss, perform the voltage breakdown test analysis of the glass fiber bushing to obtain the breakdown analysis result.

[0049] The present invention calculates the active power loss corresponding to the target equivalent circuit based on the electrical characteristic parameters, and can deeply understand the power loss of the target equivalent circuit under different working conditions, thereby providing a key basis for evaluating circuit performance. It should be explained that the electrical characteristic parameters are physical quantities that reflect 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 performance optimization space. The setting of the preset loss threshold provides a quantitative standard for timely detection of circuit abnormalities. When the active power loss exceeds the threshold, it indicates that the circuit may have a hidden fault or performance degradation. 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 collection of various information related to circuit performance generated by the target equivalent circuit during the electrical parameter simulation process. Furthermore, the simulation process The measurement of electrical characteristic parameters in the circuit can be achieved by setting up 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 of 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 electrical parameter simulation data of the target equivalent circuit can be achieved by setting up data recording and export functions in the circuit simulation software. During the simulation process, according to the predetermined time interval or specific event trigger conditions, the voltage, current, power and other electrical characteristic parameters of each node of the circuit are automatically recorded over time, as well as the working parameters of the circuit elements (such as resistance value changes, capacitance charge and discharge curves, etc.), and when the simulation ends or the stop conditions are met, these data are exported in a standardized data format (such as spreadsheets, text files, etc.) so that they can be used for in-depth research and processing using professional data processing and analysis tools in the future, providing a comprehensive data basis for analyzing circuit performance, diagnosing potential problems and optimizing circuit design.

[0050] In detail, the calculating the active power loss corresponding to the target equivalent circuit based on the electrical characteristic parameters includes: 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 cosine parameter of the electrical phase angle, Indicates the power factor.

[0051] 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 end lines corresponding to the target equivalent circuit, and the electrical phase angle cosine parameter is the cosine value of the phase difference between the terminal voltage value and the terminal current value, reflecting the degree of correlation between the two in phase and the power factor.

[0052] Further, as an optional embodiment of the present invention, the calculating of the electrical phase angle cosine parameter between the terminal voltage value and the terminal current value includes: 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 can be 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.

[0053] Among them, the voltage phase diagram and the current phase diagram are graphs corresponding to the terminal voltage value and the terminal current value, respectively, with time as the horizontal axis and the voltage / current amplitude as the vertical axis, showing the phase information of the voltage / current changing with time; the combined phase diagram is a graph in which the voltage phase diagram and the current phase diagram are combined and displayed in the same coordinate system, which is used to intuitively compare the voltage and current phase relationship; 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 the voltage or current completing a complete phase change cycle in the combined phase diagram.

[0054] Furthermore, the amplitude corresponding to different time points can be calculated by using mathematical expressions of the terminal voltage value and the terminal current value (such as a sine function expression), and the data points are plotted with time as the horizontal axis and amplitude as the vertical axis and connected with curves, or directly plotted according to the measured data of the voltage and current changing with time, to respectively construct the phase diagrams corresponding to the terminal voltage value and the terminal current value to obtain the voltage phase diagram and the current phase diagram; the voltage phase diagram and the current phase diagram can be merged 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 at the same time (by distinguishing colors, line types, etc.) to obtain a merged phase diagram; the voltage zero crossing point and the current zero crossing point in the merged phase diagram can be identified by manually observing the intersection of the waveform and the horizontal axis (the axis with zero voltage / current value) or by using computer software to write a detection algorithm; any point on the voltage or current waveform (such as a peak point, a zero crossing point, etc.) can be found in the merged phase diagram, and the position of the first repeated appearance of this point on the subsequent time axis can be observed. The time interval from the initial position to the first repeated position is the phase period.

[0055] The present invention performs voltage breakdown test analysis of the glass fiber casing by combining the casing breakdown strength, the voltage resistance performance and the active power loss, and then improves the accuracy of the voltage breakdown test of the glass fiber casing. Furthermore, first, the potential of the glass fiber casing to resist voltage breakdown is preliminarily evaluated according to the level of the casing breakdown strength. The higher the strength, the greater the possibility of withstanding high voltage without being broken down. Considering the voltage resistance performance, good performance means that a stable insulation state can be maintained under long-term voltage action. The active power loss is analyzed. Higher power loss may indicate that there are problems such as abnormal heating inside the casing, which affects its insulation performance and long-term stability. In the voltage breakdown test analysis, the parameter performances of these three aspects are comprehensively combined to comprehensively judge the safety and reliability of the glass fiber casing under different voltage conditions, thereby obtaining accurate test analysis results, providing a key basis for its applicability in actual power transmission and other application scenarios.

[0056] Compared with the problem described in the background technology, the present invention calculates the quality index value corresponding to the glass fiber sleeve based on the production process data, and the product quality corresponding to the glass fiber sleeve can be understood through the quality index value, thereby improving the accuracy of constructing subsequent equivalent product models. Furthermore, the present invention constructs 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, and can obtain an electrical performance equivalent model of the glass fiber sleeve for subsequent electric field simulation and other operations. The present invention calculates the radial electric field strength corresponding to the target equivalent circuit based on the electric field simulation data, and can quantify the distribution of the electric field around the circuit model. According to the radial electric field strength, the voltage resistance performance corresponding to the glass fiber sleeve is evaluated, thereby judging the insulation capacity and voltage resistance level of the glass fiber sleeve in an electric field environment. Furthermore The present invention gradually increases the voltage applied to the target equivalent circuit during the electric field simulation process, and monitors the circuit response characteristics of the target equivalent circuit at the same time. When the circuit response characteristics reach the preset breakdown characteristic conditions, the target equivalent circuit is determined to have a breakdown phenomenon, and the breakdown voltage value corresponding to the breakdown phenomenon is recorded. The breakdown phenomenon is determined by monitoring the circuit response characteristics, which helps to deeply understand the failure mechanism of the bushing under the action of the electric field, thereby pointing out the direction for optimizing the bushing material and structural design, and ultimately improving the reliability and stability of the glass fiber bushing under 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. Furthermore, the present invention calculates the active power loss corresponding to the target equivalent circuit based on the electrical characteristic parameters, which can deeply understand the power loss of the target equivalent circuit under different working conditions, and further provide a key basis for evaluating circuit performance. Therefore, the anti-voltage breakdown test method and system based on the glass fiber bushing provided in the embodiment of the present invention can improve the accuracy of the anti-voltage breakdown test of the glass fiber bushing.

[0057] Embodiment 2: like Figure 2 The figure shows a functional module diagram of a glass fiber casing-based voltage breakdown protection test system according to the present invention.

[0058] The voltage breakdown test system 200 based on glass fiber casing of the present invention can be installed in an electronic device. According to the functions to be implemented, the voltage breakdown test system based on glass fiber casing can include an index value calculation module 201, an electric field simulation processing module 202, a voltage resistance performance evaluation module 203, a casing breakdown strength calculation module 204 and a breakdown test analysis module 205. The module of the present invention can also be called a unit, which refers to a series of computer program segments that can be executed by an electronic device processor and can complete fixed functions, which are stored in the memory of the electronic device.

[0059] In the embodiment of the present invention, the functions of each module / unit are as follows: 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 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; The electric field simulation processing module 202 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; The voltage resistance performance evaluation module 203 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 casing according to the radial electric field strength; The bushing 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 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 205 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.

[0060] In detail, each module in the glass fiber casing-based voltage breakdown test system 200 in the embodiment of the present invention is used in the same manner as described above. Figure 1 The same technical means as the voltage breakdown protection test method based on glass fiber sheathing described in the text and can produce the same technical effects will not be repeated here.

[0061] It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution 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 resistance performance corresponding to the glass fiber casing is evaluated; 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 casing 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 radial electric field intensity corresponding to the target equivalent circuit according to the electric field simulation data includes: 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 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, 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 amount of circuit charge.

7. 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 can be 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.

8. 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 cosine parameter of the electrical phase angle, Indicates the power factor.

9. The voltage breakdown protection test method based on glass fiber casing according to claim 8, 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 can be 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.

10. A voltage breakdown 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, 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 casing according to the radial electric field strength; 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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