Optical fiber composite insulator interface key component type selection design method

Abstract

The invention discloses an optical fiber composite insulator interface key component type selection design method. The method comprises the following steps: preparing a spiral slotted optical fiber composite insulator short sample without an umbrella skirt structure; carrying out an interface performance test, and sequentially carrying out a dye penetration test, a water diffusion test and a salt spray aging test on the short sample. Then, model selection parameters are calculated, interface model selection parameters are calculated through a specific model selection formula according to the interface performance test result, and input of the formula covers a dye penetration test trafficability mark, a water diffusion test leakage current value, a salt spray aging test leakage current value and a configurable weight factor. And making a part type selection decision according to the size of the interface type selection parameter, and determining an optimal interface key part combination. The method not only comprehensively evaluates the interface performance, but also can adapt to different application scenes, can consider factory and long-term service performance, effectively improves the interface performance, insulation and aging resistance level of the optical fiber composite insulator, provides reliable reference for production and operation of the optical fiber composite insulator, and assists safe operation of a power grid.

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. The 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. The optical fiber composite insulator is embedded in the core rod or the sheath on the basis of the traditional composite insulator, 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] The commonly used optical fiber composite insulator at present is mainly formed by embedding optical fiber with polytetrafluoroethylene sheath into the core rod and then using silicone rubber material to form an integral. But there are still some problems in its actual application. The interface performance between optical fiber and silicone rubber material is a 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 that 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 under long-term complex service environment, and avoid the failure of the insulator caused by the interface failure.

[0007] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: An optical fiber composite insulator interface key component selection design method, comprising the following steps: S1, sample preparation: preparing a spiral slotted optical fiber composite insulator short sample, the short sample does not contain an umbrella skirt structure; S2, interface performance test: performing dye penetration test, water diffusion test and salt spray aging test on the short sample in turn; S3, selection parameter calculation: based on the interface performance test results, calculating the interface selection parameter through 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; S4, component selection decision: determining the optimal interface key component combination according to the size of the interface selection parameter.

[0008] Further, in step S2: The dye penetration test adopts to place the short sample horizontally on the top of the steel ball, inject the dyeing liquid and observe the penetration state, as the pass premise of 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 measures the leakage current value periodically to evaluate the salt spray resistance of the end sealing structure.

[0009] 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 under the same voltage; the salt spray aging test measures the leakage current value at fixed intervals under a fixed voltage until the cumulative aging time reaches the predetermined aging time.

[0010] Further, in step S3, the selection formula is defined as: selection parameter = pass mark x (weight factor 1 x (baseline leakage current 1 / measured leakage current 1 + weight factor 2 x (baseline leakage current 2 / measured leakage current 2 + weight factor 3 x (baseline leakage current 3 / measured leakage current 3)); The passability sign 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.

[0011] Further, in step S1: 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.

[0012] Further, the preparation of the optical fiber composite insulator comprises the following steps: spiral grooves are processed on an epoxy resin core rod, optical fibers are arranged in parallel in the grooves and end tension is applied for fixation, and finally, epoxy resin injection molding or silicon rubber injection vulcanization integrated molding is selected according to the sheath material.

[0013] 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.

[0014] The present application has the following beneficial effects: The present application provides an interface key component selection design method for an optical fiber composite insulator, 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.

[0015] The present application establishes a precise and predictable interface key component selection method for an optical fiber composite insulator, which can systematically improve the whole life cycle reliability of the product and provide quantitative decision basis for production and operation, and guarantees the safety of the power grid. The method of the present 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), so that the selection result accurately adapts to the diversified actual service environment requirements.

[0016] Finally, the method of the application provides scientific basis for the production link to optimize the component selection, and establishes a reliable performance prediction model for the operation and maintenance link, thereby systematically improving the interface insulation strength, aging resistance and environmental adaptability of the fiber optic composite insulator, reducing the interface breakdown risk from the root, and providing technical support for the safe operation of the power grid.

[0017] Other benefits of the embodiments of the application will be further described below. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The figure is a general flowchart of the method for selecting and designing key components of the interface of the fiber optic composite insulator.

[0019] Figure 2 The figure is a schematic diagram of the interface structure of the fiber optic composite insulator.

[0020] Figure 3 The figure is a water diffusion test result diagram of the fiber optic composite insulator of the embodiment of the application.

[0021] Figure 4 The figure is a salt spray aging test result diagram of the fiber optic composite insulator of the embodiment of the application. DETAILED DESCRIPTION

[0022] The embodiments of the application are described in detail below. It should be emphasized that the following description is merely exemplary, and is not intended to limit the scope of the application and its applications.

[0023] It should be noted that when an element is referred to as being "fixed" or "set" 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.

[0024] 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 the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0025] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or an ordered ranking of the indicated technical features. Thus, features defined with "first", "second" or "third" can explicitly or implicitly include one or more of such features. In the description of embodiments of the present application, the meaning of "a plurality" is two or more, unless otherwise expressly and specifically defined.

[0026] The commonly used optical fiber composite insulator is prepared by matching optical fiber with a polytetrafluoroethylene sheath and an insulator silicone rubber sheath. As a multi-layer structure, it has four interfaces of optical fiber polytetrafluoroethylene sheath-silicone rubber sheath, polytetrafluoroethylene sheath-epoxy resin core rod, and polytetrafluoroethylene sheath-optical fiber, and the interface performance is poor, and insulation breakdown is prone to occur. The present application provides a type selection design method for the key components of the interface, and provides a more excellent method for the type selection of the optical fiber composite insulator, so that the optical fiber composite insulator has excellent interface performance.

[0027] Referring to Figure 1 The embodiment of the present application provides a type selection design method for key components of an optical fiber composite insulator interface, comprising the following steps: Step S1, sample preparation: prepare a spiral slotted optical fiber composite insulator short sample, which does not contain an umbrella skirt structure.

[0028] In some embodiments, the short sample is divided into two types of specifications according to the test type: the first length short sample is used for dye penetration test, and the second length short sample is used for water diffusion test and salt spray aging test.

[0029] In some embodiments, the preparation of the optical fiber composite insulator specifically comprises: processing a spiral groove on an epoxy resin core rod, 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.

[0030] Step S2, interface performance test: sequentially performing dye penetration test, water diffusion test and salt spray aging test on the short sample.

[0031] In some embodiments, in step S2, the dye penetration test uses a horizontal placement of the short sample on the top end of a steel ball, injects a dyeing liquid and observes the penetration state, which serves as a prerequisite for the pass of subsequent tests; 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.

[0032] In some embodiments, in step S2, the first stage and the second stage of the water diffusion test use the same electrolyte solution, and the leakage current value is measured at the same voltage; the salt spray aging test measures the leakage current value at a fixed voltage at intervals until the cumulative value reaches a predetermined aging time.

[0033] Step S3, parameter selection calculation: based on the interface performance test results, the interface selection parameter is calculated by a selection formula. The input of the selection formula includes the dye penetration test passability index, the water diffusion test leakage current value, the salt spray aging test leakage current value, and the configurable weight factor. The larger the output value, the better the interface performance.

[0034] In some embodiments, the selection formula is defined as: Selection parameter = passability 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); Wherein, the passability index is assigned according to the dye penetration test results, and the measured leakage current value is derived from the first stage and 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, corresponding 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.

[0035] Step S4, component selection decision: according to the size of the interface selection parameter, the optimal interface key component combination is determined.

[0036] 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 screened out. 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 optimization design of the interface key components.

[0037] 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, helping the safe operation of the power grid, and having obvious advantages compared with the existing method.

[0038] The specific embodiments and experimental verification of the application are further described below.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] For the above molded optical fiber composite insulator, the application proposes a key component selection design method for optical fiber composite insulators, tests the interface performance of the molded optical fiber composite insulator, tests the interface performance according to the optical fiber insulator standard DL / T2386-2021, and the interface performance test includes water diffusion test, dye penetration test, and salt spray aging test.

[0043] The interface position is the most prone to failure position of the optical fiber composite insulator, and the dye penetration test is used to determine whether the interface position has defects, according to the standard of the composite insulator, the optical fiber composite insulator needs to pass the dye penetration test before it can be applied, so the dye penetration test is a pass index for the selection of the interface key component, and when it passes the dye penetration test, it can proceed to the subsequent test. After the dye penetration test is completed, the water diffusion test is performed on the sample of the optical fiber composite insulator, and the leakage current value is tested after 100h, and the leakage current value is recorded as . After the 100h water diffusion test is completed, water boiling aging is continued until 300h, and the leakage current value at this time is tested . The leakage current can reflect the ability of the interface to resist water intrusion, and the 100h leakage current value that meets the interface performance requirements is set to (the reference leakage current can be determined based on the standard requirements or qualified sample statistical data), and the 300h leakage current value is . The 600h water boiling aging test mainly investigates the ability of the interface to resist long-term aging of heat and humidity. When the sample breaks down, and are recorded as infinity. If the measured leakage current is extremely small or breakdown occurs, the corresponding calculation component can be taken as 0.

[0044] The salt spray aging test mainly tests the ability of the end sealing structure to resist salt spray, a harsh environment, and the application selects a 30mm high optical fiber insulator short sample and directly places it in the salt spray test box, so that the interface is subjected to the salt spray environment, to simulate the most severe salt spray aging environment faced by the end of the actual optical fiber composite insulator. Every 100h, test the leakage current size under 10kV , set the 600h aging leakage current value that meets the salt spray aging requirement to . When the sample breaks down, is recorded as infinity.

[0045] The selection formula is , when the dye penetration test passes, N = 1, when the dye penetration test fails, N = 0, is the water diffusion test weight factor, which is taken as 0.4 in the application, is the long-term water diffusion test weight factor, which is taken as 0.3 in the application, 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.

[0046] 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 parameters according to a selection formula with a weight factor that can be flexibly adjusted according to application scenarios. 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, and more accurately screening the key component combination that meets the actual needs, 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 components selected by this method have excellent high-temperature and high-humidity environment resistance, interface sealing performance, insulation level and aging resistance, so they can adapt to complex and variable environmental conditions.

[0047] Experimental example The novel composite insulator interface key component selection design method includes the following steps: 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.

[0048] 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.

[0049] 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.

[0050] 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 an alternating current voltage.

[0051] 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.

[0052] The interface performance test results of the two tested optical fiber composite insulators are compared as follows Figure 4 As shown in Table 1, wherein the X parameter is calculated as 0.05mA is taken, 0.10mA is taken, 0.5mA is taken. The interface selection test results 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.

[0053] Figure 3 is a water diffusion test result diagram of the new optical fiber composite insulator, wherein 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 , the water diffusion leakage current effective value of the new optical fiber composite insulator is only 0.048mA under the condition of an alternating voltage effective value of 12kV after 100h, compared with the interface breakdown phenomenon of the polytetrafluoroethylene sheath-silicone rubber optical fiber composite insulator, which shows excellent interface water invasion resistance.

[0054] Figure 4 is a salt spray aging test result diagram of the new optical fiber composite insulator. As can be seen from Figure 4 , the leakage current of the samples of the two optical fiber composite insulators remains at a low level in the initial stage of salt spray aging, and the polytetrafluoroethylene sheath optical fiber-silicone rubber optical fiber insulator is subjected to breakdown. The leakage current of the new optical fiber composite insulator increases to a certain extent in the initial stage of aging, and then fluctuates, and remains at a low level after the fluctuation stage. The leakage current value starts to increase linearly after 400h of aging time, and increases to 0.27mA at 600h. This salt spray aging can show that the new optical fiber composite insulator still maintains excellent interface performance in a long-term salt spray aging environment.

[0055] Table 1 is a selection result diagram of the optical fiber composite insulator.

[0056] Table 1

[0057] 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.

[0058] In summary, the important innovation contributions and design features of the application include: (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.

[0059] (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.

[0060] (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.

[0061] In summary, the application provides a type selection design method for an interface key component of an optical fiber composite insulator.

[0062] 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 limitation 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.

[0063] 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 helps the safe operation of the power grid.

[0064] 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. An optical fiber composite insulation sub-interface key component selection design method, characterized in that, The method comprises the following steps: S1, sample preparation: prepare a spiral slotted optical fiber composite insulator short sample, which does not contain an umbrella skirt structure; S2, interface performance test: sequentially perform a dye penetration test, a water diffusion test and a salt spray aging test on the short sample; S3, calculation of selection parameters: based on the interface performance test results, calculate the interface selection parameters through a selection formula; wherein the input of the selection formula includes a dye penetration test passability index, a water diffusion test leakage current value, a salt spray aging test leakage current value and a configurable weight factor; S4, component selection decision: determine the optimal interface key component combination according to the size of the interface selection parameters.

2. The method of claim 1, wherein the method further comprises: determining a fiber optic cable type based on the fiber optic cable type information; and determining a fiber optic cable type based on the fiber optic cable type information. In step S2: The dye penetration test adopts a method of horizontally placing the short sample on the top of a steel ball, injecting a dyeing solution and observing the penetration state, which is a prerequisite for the passability of subsequent tests; 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.

3. The method of claim 2, wherein the method further comprises: determining the interface key component selection design of the optical fiber composite insulation sub-interface key component selection design method based on the interface key component selection design of the optical fiber composite insulation sub-interface key component selection design method. 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 length.

4. The method of claim 1, wherein the method further comprises: determining a fiber optic cable type; and determining a fiber optic cable size. In step S3, the selection formula is defined as: Selection parameter = passability 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); Wherein, the passability index 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; wherein, the weight factor 1, the weight factor 2 and the weight factor 3 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.

5. The method of claim 1 to 4, wherein the method is characterized in that, In step S1: 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.

6. The optical fiber composite insulator interface key component selection design method according to any one of claims 1 to 4, wherein: The optical fiber composite insulator is prepared by the following method: spiral grooves are processed on an epoxy resin mandrel, optical fibers are arranged in parallel in the grooves and an end tension is applied for fixation, and finally an epoxy resin is injection molded or a silicone rubber is injection vulcanized integrated molding according to the sheath material.

7. The optical fiber composite insulator interface key component selection design method according to any one of claims 1 to 4, wherein: 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.

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