Optical fiber composite insulator interface key component selection design method

Abstract

The application discloses a kind of optical fiber composite insulator interface key component selection design methods, comprising: preparing spiral slotted type optical fiber composite insulator short sample without umbrella skirt structure. Interface performance test is carried out, and dye penetration test, water diffusion test and salt fog aging test are carried out in turn on short sample. Then, the selection parameter calculation is carried out, and the interface selection parameter is calculated by a specific selection formula according to the interface performance test result, the input of the formula covers the dye penetration test passing sign, the water diffusion test leakage current value, the salt fog aging test leakage current value and the configurable weight factor. According to the size of interface selection parameter, make component selection decision, determine the optimal interface key component combination. The method can comprehensively evaluate the interface performance, and can adapt to different application scenarios, can consider the performance of factory and long-term service, effectively improve the interface performance, insulation and aging resistance level of optical fiber composite insulator, provide reliable reference for its production and operation, help power grid safe operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric power insulation equipment, in particular to a method for selecting and designing key components of an optical fiber composite insulator interface. BACKGROUND

[0002] With the development of power systems towards higher voltage, larger capacity and more intelligent direction, the performance requirements of power equipment are also increasing. In the transmission line and substation, the insulator as a key component, its role is to support and fix the conductor, and to ensure the insulation performance between the conductor and the tower or other grounded components. Composite insulator as a new type of insulating material, has gradually become a research and application hotspot. Composite insulator is composed of a core rod, a sheath and a shed. The core rod is usually made of glass fiber reinforced plastic (FRP) material, which has the characteristics of high strength, light weight and corrosion resistance; the sheath and the shed are made of high-elasticity and anti-aging materials such as silicone rubber, which can effectively improve the pollution flashover resistance and anti-aging performance of the insulator. Compared with traditional porcelain insulators, composite insulators not only have lighter weight and higher mechanical strength, but also have better pollution resistance and aging resistance, which can adapt to complex and variable environmental conditions.

[0003] With the rapid development of intelligent and information technology of power system, in order to meet the demand of power system for data transmission and monitoring, optical fiber composite insulator (OFCI) as a new product, has gradually attracted widespread attention. Optical fiber composite insulator is based on traditional composite insulator, and optical fiber is embedded in the core rod or sheath, so that it not only has insulation function, but also can realize the transmission of optical signal in power system. This design not only meets the demand of power system for insulation performance, but also realizes the real-time monitoring of the operation state of transmission line, such as temperature, humidity, vibration and partial discharge parameters, so as to significantly improve the intelligent level and operation reliability of power system.

[0004] At present, the commonly used optical fiber composite insulator mainly uses optical fiber with polytetrafluoroethylene sheath embedded in the core rod, and then uses silicone rubber material to form an integral body. But there are still some problems in its actual application. The interface performance between optical fiber and silicone rubber material is the key factor affecting its reliability. The insufficient interface bonding strength between optical fiber and core rod or sheath may cause the fracture or signal attenuation of optical fiber in long-term operation, and the interface problem will affect the normal operation of the insulator, causing internal insulation breakdown and other failures.

[0005] It should be noted that the information disclosed in the above background section is only for understanding the background of the present application, and therefore can include information which does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0006] The main purpose of the present application is to overcome the defects existing in the background art, provide an optical fiber composite insulator interface key component selection design method, to screen out the interface key component combination that can ensure the high reliability of the optical fiber composite insulator in the long-term complex service environment, and avoid the insulator failure caused by interface failure.

[0007] To achieve the above purpose, the present application adopts the following technical scheme:

[0008] An optical fiber composite insulator interface key component selection design method, comprising the following steps:

[0009] S1, sample preparation: prepare a spiral slotted optical fiber composite insulator short sample, which does not contain an umbrella skirt structure;

[0010] S2, interface performance test: the short sample is sequentially subjected to dye penetration test, water diffusion test and salt spray aging test;

[0011] S3, selection parameter calculation: based on the interface performance test results, the interface selection parameters are calculated by a selection formula; wherein the input of the selection formula includes dye penetration test pass mark, water diffusion test leakage current value, salt spray aging test leakage current value and configurable weight factor;

[0012] S4, component selection decision: according to the size of the interface selection parameters, the optimal interface key component combination is determined.

[0013] Further, in step S2:

[0014] The dye penetration test adopts horizontal placement of the short sample on the top of the steel ball, injection of the dyeing liquid and observation of the penetration state, as the pass premise of the subsequent test;

[0015] The water diffusion test includes two stages: the first stage tests the leakage current value after a predetermined time, and the second stage tests the leakage current value after an extended aging time;

[0016] The salt spray aging test measures the leakage current value periodically to evaluate the salt spray resistance of the end sealing structure.

[0017] Further, in step S2: the first stage and the second stage of the water diffusion test use the same electrolyte solution and measure the leakage current value at the same voltage; the salt spray aging test measures the leakage current value at a fixed voltage at intervals until the cumulative aging time reaches a predetermined aging time.

[0018] Further, in step S3, the selection formula is defined as: selection parameter = permeability index * (weight factor 1 * reference leakage current 1 / measured leakage current 1 + weight factor 2 * reference leakage current 2 / measured leakage current 2 + weight factor 3 * reference leakage current 3 / measured leakage current 3).

[0019] Wherein, the permeability index is valued according to the dye penetration test result, and the measured leakage current value is derived from the water diffusion test first stage, the second stage and the salt spray aging test; the weight factor 1, the weight factor 2 and the weight factor 3 are adjustable parameters, and correspond to the weight distribution of the water diffusion test first stage, the water diffusion test second stage and the salt spray aging test, respectively.

[0020] Further, in step S1:

[0021] The short sample is divided into two types of specifications according to the test type: the first length short sample is used for the dye penetration test, and the second length short sample is used for the water diffusion test and the salt spray aging test.

[0022] Further, the preparation of the optical fiber composite insulator comprises the following steps: processing a spiral groove in an epoxy resin mandrel, arranging optical fibers in parallel in the groove and applying an end tension to fix, and finally selecting epoxy resin injection molding or silicone rubber injection vulcanization integrated molding according to the sheath material.

[0023] Further, the interface key component selection design method realizes long-term service performance evaluation of the interface key component by prolonging the water diffusion test time and the salt spray aging test time, and screens out a key component combination suitable for actual long-term service requirements.

[0024] The present application has the following beneficial effects:

[0025] The present application provides an optical fiber composite insulator interface key component selection design method, which significantly improves the interface reliability and service life of the optical fiber composite insulator through multi-dimensional interface performance testing and quantitative selection mechanism.

[0026] The application establishes a precise and predictable optical fiber composite insulator interface key component selection method, which can systematically improve the product's full life cycle reliability, provide quantitative decision basis for production and operation, and ensure the safety of the power grid. The method of the application innovatively introduces a configurable weight factor and a selection decision formula, dynamically adjusts the weight distribution of different performance dimensions (such as short-term water diffusion, long-term water diffusion, and salt spray aging), and makes the selection result accurately adapt to the diversified actual service environment requirements. Further, through long-period test design (such as 300h water diffusion and 600h salt spray aging), the full life cycle performance evolution of the interface from the factory state to the long-term operation is covered, breaking through the limitation of only focusing on the initial performance in traditional selection, and ensuring the persistent stability of the key component combination in complex environment.

[0027] Finally, the method of the application provides scientific basis for the production link to optimize component selection, and establishes a reliable performance prediction model for the operation link, thereby systematically improving the interface insulation strength, aging resistance and environmental adaptability of the optical fiber composite insulator, reducing the interface breakdown risk from the root, and providing technical support for the safe operation of the power grid.

[0028] Other beneficial effects in the embodiments of the application will be further described below. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is the overall flow chart of the optical fiber composite insulator interface key component selection design method of the application.

[0030] Figure 2 is a schematic diagram of the interface structure of the optical fiber composite insulator.

[0031] Figure 3 is the water diffusion test result diagram of the optical fiber composite insulator in the embodiment of the application.

[0032] Figure 4 is the salt spray aging test result diagram of the optical fiber composite insulator in the embodiment of the application. DETAILED DESCRIPTION

[0033] The embodiments of the application are described in detail below. It should be emphasized that the following description is only exemplary and is not intended to limit the scope of the application and its applications.

[0034] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, the connection can be for fixing or for coupling or communicating.

[0035] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate directions or positions based on the directions or positions shown in the drawings and are used for convenience in describing the present application and simplifying the description, and thus cannot be construed as indicating or implying that a device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus cannot be construed as limiting the present application.

[0036] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0037] The commonly used optical fiber composite insulator is prepared by matching the optical fiber with the insulator silicone rubber sheath, as a multi-layer structure, which has four interfaces of optical fiber PTFE sheath-silicone rubber sheath, PTFE sheath-epoxy resin mandrel, PTFE sheath-optical fiber, and the interface performance is poor, and insulation breakdown is prone to occur. The present application provides a selection design method for the key components of the interface, which provides a more excellent method for the selection of the optical fiber composite insulator, so that the optical fiber composite insulator has excellent interface performance.

[0038] Referring to Figure 1 The embodiment of the present application provides a selection design method for key components of an optical fiber composite insulator interface, which comprises the following steps:

[0039] Step S1, sample preparation: prepare a spiral slotted optical fiber composite insulator short sample, which does not contain an umbrella skirt structure.

[0040] In some embodiments, the short sample is divided into two specifications according to the test type: the first length short sample is used for the dye penetration test, and the second length short sample is used for the water diffusion test and the salt spray aging test.

[0041] In some embodiments, the preparation of the optical fiber composite insulator specifically comprises: processing a spiral groove on an epoxy resin mandrel, arranging optical fibers in parallel in the groove and applying an end tension to fix, which does not exceed the allowable tensile strength of the optical fiber, and finally selecting epoxy resin injection molding or silicon rubber injection vulcanization integrated molding according to the sheath material.

[0042] Step S2, interface performance test: sequentially performing dye penetration test, water diffusion test and salt spray aging test on the short sample.

[0043] In some embodiments, in step S2, the dye penetration test uses a short sample placed horizontally on the top of a steel ball, injects dyeing solution and observes the penetration state, which serves as a prerequisite for the subsequent test; the water diffusion test includes two stages: the first stage tests the leakage current value after a predetermined time, and the second stage tests the leakage current value after an extended aging time; the salt spray aging test evaluates the salt spray resistance of the end sealing structure by periodically measuring the leakage current value.

[0044] In some embodiments, in step S2, the first stage and the second stage of the water diffusion test use the same electrolyte solution and measure the leakage current value at the same voltage; the salt spray aging test measures the leakage current value at a fixed voltage at intervals until the cumulative time reaches a predetermined aging time.

[0045] Step S3, calculation of selection parameters: based on the interface performance test results, the interface selection parameters are calculated through a selection formula. The input of the selection formula includes the dye penetration test pass sign, the water diffusion test leakage current value, the salt spray aging test leakage current value, and the configurable weight factor, and the larger the output value, the better the interface performance.

[0046] In some embodiments, the selection formula is defined as:

[0047] Selection parameter = pass sign × (weight factor 1 × reference leakage current 1 / measured leakage current 1 + weight factor 2 × reference leakage current 2 / measured leakage current 2 + weight factor 3 × reference leakage current 3 / measured leakage current 3);

[0048] Wherein, the pass sign is assigned according to the results of the dye penetration test, and the measured leakage current value is derived from the first stage, the second stage of the water diffusion test and the salt spray aging test; the weight factor 1, the weight factor 2 and the weight factor 3 are adjustable parameters, which correspond to the weight distribution of the first stage of the water diffusion test, the second stage of the water diffusion test and the salt spray aging test, respectively.

[0049] Step S4, component selection decision: according to the size of the interface selection parameter, the optimal interface key component combination is determined.

[0050] In some embodiments, the long-term service performance of the interface key components is evaluated by extending the water diffusion test time and the salt spray aging test time, and the key component combination that meets the actual long-term service requirements is selected. In this embodiment, the interface key component selection design method evaluates the factory interface performance and the long-term service interface performance to realize the selection and optimization design of the interface key components.

[0051] The novel optical fiber composite insulator interface key component selection design method provided by the application is aimed at the weakest interface position of the optical fiber composite insulator, and the interface performance is comprehensively investigated through dye penetration test, water diffusion test, long-time water diffusion test and salt spray aging test, and the interface selection parameters are calculated based on the test results and a selection formula containing a weight factor that can be adjusted according to the application scenario to determine the optimal key component combination. Further, according to the method of the application, not only can the selection optimization of the interface factory performance be realized by designing the test covering the short-term performance evaluation, but also the long-term service performance of the interface can be optimized by prolonging the test time, so that the key components with excellent high-temperature and high-humidity environment resistance, interface sealing performance, insulation level and aging resistance level can be selected, effectively solving the problems of short service life caused by interface problems, providing effective reference for the production and operation of the optical fiber composite insulator, making it adapt to complex and variable environmental conditions, assisting the safe operation of the power grid, and having obvious advantages compared with the existing method.

[0052] The specific embodiments and experimental verification of the application are further described below.

[0053] The selection design method of the application is mainly aimed at the spiral slotted optical fiber composite insulator, and its structure is shown in Figure 2 The optical fiber composite insulator is composed of an insulator sheath 1, a group of umbrellas 2, a glass fiber epoxy resin core rod 3 and an optical fiber 4. The optical fiber can be selected from optical fibers with a polytetrafluoroethylene sheath, optical fibers with a thermoplastic polyester elastomer sheath, or bare optical fibers prepared by coating an acrylic epoxy resin layer on the outer layer of the optical fiber through photocuring. The insulator sheath and the group of umbrellas can be selected from silicone rubber materials or epoxy resin materials.

[0054] The preparation method of the optical fiber composite insulator is as follows: first, the epoxy resin core rod needs to be processed to have a spiral groove, and the width and depth of the spiral groove are determined according to the number of implanted optical fibers, which is convenient for subsequent implantation of optical fibers. The number of implanted optical fibers is determined according to the actual application scene and requirements, and the optical fibers are arranged in parallel in the spiral groove, with a distance of 2-3 mm between the optical fibers to ensure that the optical fiber position does not overlap and the interface between the optical fibers does not appear interface insulation breakdown.

[0055] After the bare optical fiber is arranged in the spiral groove, a certain length of optical fiber needs to be reserved at both ends to ensure that a certain end tension is applied to it during the subsequent injection molding integrated molding process, and it does not deviate and tightly fits the epoxy resin core rod spiral groove. After the optical fiber is fixed, different pouring methods are selected according to the different materials of the sheath and the group of umbrellas. The epoxy resin material is selected to be placed in the optical fiber composite insulator mold on the automatic pressure gel machine for vacuum injection of epoxy resin for integrated molding, and the silicone rubber material is selected to be injection vulcanized for integrated molding.

[0056] For the above-mentioned formed optical fiber composite insulator, this invention proposes a key component selection and design method for optical fiber composite insulators. After forming, the interface performance of the optical fiber composite insulator is tested. The interface performance test is carried out according to the optical fiber insulator standard DL / T2386-2021. The interface performance test includes water diffusion test, dye penetration test, and salt spray aging test.

[0057] The interface is the most vulnerable location for failure in fiber optic composite insulators. This invention uses a dye penetration test to determine the presence of defects at the interface. According to composite insulator standards, fiber optic composite insulators must pass the dye penetration test before application. Therefore, the dye penetration test is a pass / fail indicator for selecting key interface components; subsequent tests can only proceed after the dye penetration test is passed. After the dye penetration test, a water diffusion test is performed on the fiber optic composite insulator samples, and the leakage current value is measured after 100 hours. The leakage current value is recorded as follows. After the 100-hour water diffusion test, water boiling aging was continued until 300 hours, at which point the leakage current value was measured. Leakage current reflects the interface's ability to withstand moisture intrusion. A 100-hour leakage current value is set to meet the interface performance requirements. (The reference leakage current can be determined based on standard requirements or statistical data of qualified samples), the leakage current value over 300 hours is... The 600-hour boiling water aging test primarily examines the interface's long-term resistance to aging under both damp and heat conditions. When the sample breaks down... and It is denoted as infinity. If the measured leakage current is extremely small or a breakdown occurs, the corresponding calculated component can be taken as 0.

[0058] Salt spray aging tests primarily assess the end-sealing structure's tolerance to the harsh salt spray environment. This invention selects a 30mm high fiber optic insulator sample and places it directly inside the salt spray test chamber, subjecting its interface to the salt spray environment to simulate the most severe salt spray aging environment faced by the end of an actual fiber optic composite insulator. The leakage current at 10kV is measured every 100 hours. The leakage current value is set to meet the salt spray aging requirements after 600 hours of aging. When the sample breaks down It is denoted as infinity.

[0059] The selection formula is: When the dye penetration test passes, N = 1; when the dye penetration test fails, N = 0. The weighting factor for the water diffusion test is 0.4 in this invention. For long-term water diffusion experiments, the weighting factor is set to 0.3 in this invention. For the salt spray aging test weight molecule, 0.3 is taken in the application. According to different performances concerned, the weight molecule can take different parameters. The weight factor can be adjusted according to the service environment, and the total weight can be 1. The larger the value of X is, the more excellent the interface performance of the optical fiber composite insulator is.

[0060] The interface performance is comprehensively investigated through various evaluation methods such as dye penetration test, water diffusion test, long-time water diffusion test and salt spray aging test, and the optimal component combination is determined by calculating the parameters of the selection formula with a weight factor that can be flexibly adjusted according to the application scenario. This method forms a precise and reliable selection system and provides an excellent solution for key component selection. Using this method, the basic performance of the interface at the factory can be evaluated through short-term tests, and the service performance in long-term complex environments can be investigated by extending the test time, realizing the coverage of the interface performance throughout the life cycle. The key component combination that meets the actual needs can be more accurately screened out, effectively solving the problem of short service life caused by interface problems, and significantly improving the reliability and practicality of the selection results. The key component selected by this method has excellent high-temperature and high-humidity environment resistance, interface sealing performance, insulation level and aging resistance, so it can adapt to complex and variable environmental conditions.

[0061] Experimental example

[0062] The novel composite insulator interface key component selection design method includes the following steps:

[0063] Step 1: Test sample processing. A section of the sample that needs to be tested is cut from the whole new optical fiber composite insulator. The sample is cut to a length of 30 mm for water diffusion test and salt spray aging test, and a 10 mm sample is used for dye penetration test. The short sample is selected from the part that does not contain the umbrella group.

[0064] Step 2: Dye penetration test. Place the 10 mm sample horizontally on the top of a small steel bead with a diameter of 1 mm. The dyeing solution is a methanol solution containing 1% by weight of methylene dye. Observe the sample for 15 minutes to see if the dye penetrates the sample.

[0065] Step 3: Water diffusion test. Place the 30 mm sample in a constant temperature water bath with a mass fraction of 0.1% sodium chloride and perform a 300 h water boiling test. After the water boiling test, apply a voltage of 12 kV to test the leakage current.

[0066] Step 4: Long-time water diffusion test. Place the 30 mm sample in a constant temperature water bath with a mass fraction of 0.1% sodium chloride and continue the water boiling test until the water boiling test reaches 600 h. After the water boiling test, apply a voltage of 12 kV to test the leakage current. The voltage for leakage current test is usually a power frequency alternating voltage.

[0067] Step 5 salt spray aging test, 30mm sample is placed in a salt spray test chamber, and its leakage current under a power frequency effective value of 10kV voltage is tested every 100h.

[0068] The test results of the interface performance of the two optical fiber composite insulators are compared as follows Figure 4 As shown in Table 1. Among them, the X parameter is calculated as 0.05mA is taken, 0.10mA is taken, 0.5mA is taken. The results of the interface selection test show that the new optical fiber composite insulator selection design method proposed in the application can determine the selection of key components through multiple interface performance indicators and long-term service performance, and provides a more excellent method for the selection of optical fiber composite insulators.

[0069] Figure 3 is a water diffusion test result diagram of the new optical fiber composite insulator, in which the polytetrafluoroethylene sheath-silicone rubber optical fiber composite insulator is subjected to interface breakdown after 100h of water diffusion. As can be seen from Figure 3 , at this time, the new optical fiber composite insulator after 100h, under the condition of an alternating voltage effective value of 12kV, its water diffusion leakage current effective value is only 0.048mA. Compared with the interface breakdown phenomenon of the polytetrafluoroethylene sheath-silicone rubber optical fiber composite insulator, it shows excellent interface water invasion resistance.

[0070] Figure 4 is a salt spray aging test result diagram of the new optical fiber composite insulator. As can be seen from Figure 4 , at the initial stage of salt spray aging, the leakage current of the samples of the two optical fiber composite insulators remains at a low level. With the increase of the salt spray aging time, the polytetrafluoroethylene sheath optical fiber-silicone rubber optical fiber insulator is subjected to breakdown. The new optical fiber composite insulator has a certain increase in leakage current at the initial stage of aging, followed by a fluctuation stage of current, and the current remains at a low level after the fluctuation stage. After 400h of aging time, the leakage current value starts to increase linearly, and increases to 0.27mA at 600h. This salt spray aging can show that in a long-term salt spray aging environment, the new optical fiber composite insulator still maintains excellent interface performance.

[0071] Table 1 is a selection result diagram of the optical fiber composite insulator.

[0072] Table 1

[0073]

[0074] As can be seen from Table 1, in each test, the optical fiber composite insulator (hereinafter referred to as new optical fiber composite insulator) designed by the method of the application shows obvious advantages compared with the polytetrafluoroethylene sheathed optical fiber-silicon rubber optical fiber insulator. In terms of dye penetration time, the new optical fiber composite insulator does not penetrate for 15 min, while the polytetrafluoroethylene sheathed optical fiber-silicon rubber optical fiber insulator is only 8 s; in the water diffusion leakage current test, the leakage current of the new optical fiber composite insulator is extremely small in the 100 h and 300 h tests, and no breakdown occurs, while the polytetrafluoroethylene sheathed optical fiber-silicon rubber optical fiber insulator all breaks down; in the 600 h salt spray aging test, the leakage current of the new optical fiber composite insulator is 0.27 mA, which is much smaller than the breakdown of the polytetrafluoroethylene sheathed optical fiber-silicon rubber optical fiber insulator, and the selection parameter X of the new optical fiber composite insulator is 1.545, and that of the polytetrafluoroethylene sheathed optical fiber-silicon rubber optical fiber insulator is 0, which fully embodies that the optical fiber composite insulator designed by the method of the application has excellent interface sealing performance, water diffusion resistance and salt spray aging resistance, and achieves significant advantages in performance and effect.

[0075] In summary, the important innovation contributions and design features of the application include:

[0076] (1) The application proposes a new type of optical fiber composite insulator interface key component selection design method, which investigates the interface performance according to dye penetration, water diffusion test, long-term water diffusion test, salt spray aging test, and proposes an interface selection formula to determine the optimal interface selection method.

[0077] (2) In the interface selection process, different weight factors are used for different performance evaluation dimensions such as water diffusion test, long-term water diffusion test and salt spray aging test, and the weight factors can be flexibly adjusted according to different application scenarios of the optical fiber composite insulator, so that the selection result is more suitable for the actual service environment requirements, and the pertinence and adaptability of the selection are improved.

[0078] (3) Further, in the interface selection process, the application realizes the evaluation of the interface factory performance by designing tests covering short-term performance (such as dye penetration test, 100 h water diffusion test), and realizes the evaluation of the interface long-term service performance by prolonging the test time (such as 300 h water diffusion test, 600 h salt spray aging test), forming a consideration of the interface performance throughout its life cycle. This selection design method not only evaluates the basic performance of the interface at the factory, but also investigates the service performance of the interface in long-term complex environment, realizes the comprehensive coverage of the interface performance from the initial state to the long-term running state, can more accurately select the key component combination that meets the actual long-term service requirements, and improves the reliability and practicality of the selection result, providing stronger technical support for the long-term stable operation of the optical fiber composite insulator.

[0079] In summary, the application provides a type selection design method for an interface key component of an optical fiber composite insulator.

[0080] This method can provide scientific and accurate technical basis for the production and operation of the optical fiber composite insulator, and through the optimal combination standard of the key components, the production process is optimized, and reliable performance prediction is provided for operation and maintenance, which breaks through the limitations of the traditional type selection method from the technical level, and significantly improves the overall quality and operation stability of the optical fiber composite insulator.

[0081] The optical fiber composite insulator selected by this method has excellent interface performance, high insulation level and high aging resistance, and can adapt to complex and changeable environmental conditions, and well assist the safe operation of the power grid.

[0082] The above is a further detailed description of the application in combination with specific / preferred embodiments, and cannot be considered as limiting the specific implementation of the application to these descriptions. For ordinary skilled persons in the technical field to which the application belongs, without departing from the concept of the application, they can make several alternatives or modifications to the described embodiments, and these alternatives or modifications shall be considered as belonging to the protection scope of the application. In the description of the specification, the description of the terms "an embodiment", "some embodiments", "preferred embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In the case of no mutual contradiction, the skilled person in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples. Although the embodiments of the application and its advantages have been described in detail, it should be understood that various changes, replacements and modifications can be made herein without departing from the scope of the patent application.

Claims

1. A method for selecting and designing key components at the interface of an optical fiber composite insulator, characterized in that, Includes the following steps: S1. Sample preparation: Prepare a short sample of a spiral slotted fiber optic composite insulator, which does not include a skirt structure. S2. Interface Performance Testing: The short sample is subjected to a dye penetration test, a water diffusion test, and a salt spray aging test sequentially. The dye penetration test involves injecting dyeing solution into the short sample and observing the penetration state, serving as a prerequisite for subsequent tests. The water diffusion test comprises two stages: the first stage tests the leakage current value after a predetermined time, and the second stage tests the leakage current value after an extended aging time. The salt spray aging test evaluates the salt spray resistance of the short sample by measuring the leakage current value. Extending the duration of both the water diffusion test and the salt spray aging test allows for the long-term service performance evaluation of key interface components. S3. Selection Parameter Calculation: Based on the interface performance test results, the interface selection parameters are calculated using a selection formula. The input to the selection formula includes the dye penetration test passability indicator, the water diffusion test leakage current value, the salt spray aging test leakage current value, and configurable weighting factors. The selection formula is defined as: Selection Parameter = Passability Indicator × (Weighting Factor 1 × Reference Leakage Current 1 / Measured Leakage Current 1 + Weighting Factor 2 × Reference Leakage Current 2 / Measured Leakage Current 2 + Weighting Factor 3 × Reference Leakage Current 3 / Measured Leakage Current 3). The passability indicator is assigned a value based on the dye penetration test results, and the measured leakage current value originates from the first and second stages of the water diffusion test and the salt spray aging test. Weighting Factor 1, Weighting Factor 2, and Weighting Factor 3 correspond to the weight allocation of the first stage of the water diffusion test, the second stage of the water diffusion test, and the salt spray aging test, respectively. S4. Component selection decision: Based on the magnitude of the interface selection parameters, determine the optimal combination of key interface components to select the key component combination that meets the actual long-term service requirements.

2. The method for selecting and designing key components of the fiber optic composite insulator interface as described in claim 1, characterized in that, In step S2: The dye penetration test involves placing a short sample horizontally on the top of a steel ball, injecting dyeing solution, and observing the penetration state. Salt spray aging tests evaluate the salt spray resistance of the end-sealing structure by periodically measuring the leakage current value.

3. The method for selecting and designing key components of the fiber optic composite insulator interface as described in claim 2, characterized in that, In step S2: The first and second stages of the water diffusion test used the same electrolyte solution and measured the leakage current value under the same voltage. The salt spray aging test measures the leakage current value at intervals under a fixed voltage until the predetermined aging time is reached.

4. The method for selecting and designing key components of the fiber optic composite insulator interface as described in any one of claims 1 to 3, characterized in that, In step S1: The short samples are divided into two specifications according to the test type: the dye penetration test uses the first length short sample, and the water diffusion test and salt spray aging test use the second length short sample.

5. The method for selecting and designing key components of the fiber optic composite insulator interface as described in any one of claims 1 to 3, characterized in that: The fiber optic composite insulator is prepared by processing a spiral groove in an epoxy resin core rod, arranging the optical fibers in parallel within the groove and applying end tension to fix them, and finally selecting epoxy resin injection molding or silicone rubber injection vulcanization integral molding according to the sheath material.

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