Composite insulator umbrella skirt material aging process characterization method and system based on tensile deformation and leakage current

Abstract

The invention discloses a composite insulator umbrella skirt material aging process characterization method and system based on tensile deformation and leakage current, and belongs to the technical field of insulator performance detection. The characterization method comprises the following steps: simultaneously collecting a change curve A of tensile deformation of an aging test sample along with aging time and a change curve B of a leakage current value along with the aging time under constant tensile stress; and analyzing a change curve A of the tensile deformation along with the aging time and a change curve B of the leakage current value along with the aging time, and determining an induction stage and an initial stage of the aging process. The characterization method can be used for accurately characterizing the initial aging stage of the composite insulator silicone rubber material.

Description

Technical Field

[0001] The invention belongs to the technical field of insulator performance detection, and in particular relates to a method and system for characterizing the aging process of composite insulator shed materials based on tensile deformation and leakage current. Background Art

[0002] Composite insulators are widely used in transmission lines due to their limited features such as resistance to pollution flashover, light weight, and excellent insulation performance. However, after long-term use, composite insulators will experience structural changes such as powdering and cracking of the shed surface, which will cause a decrease in hydrophobicity and the risk of surface discharge or breakdown. At present, research on the aging process of silicone rubber materials for composite insulator sheds is mainly focused on the stage when its structure undergoes significant changes. There is less research on the induction stage and initial stage of aging, and there is a lack of methods to find and characterize the induction stage and initial stage of aging. Accurate understanding of the induction stage and initial stage of aging of silicone rubber materials is the basis for evaluating the performance and life of composite insulators, and is also the basis for the research and development of high-performance composite insulator silicone rubber materials.

[0003] At present, the main methods for studying the aging law of silicone rubber materials are thermal aging, wet heat aging, thermo-mechanical aging, etc. Specifically, the silicone rubber samples are aged under high temperature, high humidity, and mechanical stress for a period of time to study the changes in the test structure and performance. For example, tensile strength and leakage current are important means to characterize the performance of insulating materials, and are also widely used in the performance characterization of silicone rubber materials. For composite insulator silicone rubber materials, the tensile strength values ​​and leakage current values ​​can be tested before and after the accelerated aging test for a period of time, and the degree of aging can be judged by the degree of change in the values, that is, the greater the degree of change in the values, the more serious the aging.

[0004] However, since the above method cannot achieve real-time measurement of performance, it will require a lot of work to find the aging induction stage and initial stage of silicone rubber materials through this method. For example, it is necessary to determine many aging time points and gradually narrow the scope to find the aging induction stage and initial stage.

[0005] In order to efficiently reveal the aging induction stage and initial stage of silicone rubber materials under different aging environments, the present invention provides a method for characterizing the aging process of silicone rubber materials of composite insulator sheds based on tensile deformation and leakage current. Summary of the invention

[0006] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a method and system for characterizing the aging process of composite insulator shed materials based on tensile deformation and leakage current, so as to accurately characterize the initial stage of aging of composite insulator silicone rubber materials.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: The present invention provides a method for characterizing the aging process of composite insulator shed materials based on tensile deformation and leakage current, comprising: At the same time, the variation curve A of the tensile deformation of the aging test sample with the aging time and the variation curve B of the leakage current value with the aging time are collected under constant tensile stress; The variation curve A of the tensile deformation with the aging time and the variation curve B of the leakage current with the aging time are analyzed to determine the induction stage and the initial stage of the aging process.

[0008] Preferably, the aging test sample is a dumbbell-shaped sample, and the sample surface other than the thin neck middle section of the dumbbell-shaped sample is covered with a conductive electrode.

[0009] Preferably, the covering of the conductive electrode is completed under a stretching condition, and the stretching condition is that the deformation amount of the dumbbell-shaped sample exceeds the elastic deformation range.

[0010] Preferably, the time period when the leakage current value in the curve B of the change of leakage current value with aging time first rises is the induction stage of the aging process; after the induction stage, the time period until the tensile deformation value in the curve A of the change of tensile deformation value with aging time suddenly changes is the initial stage of the aging process.

[0011] Preferably, the constant tensile stress is 0.1 MPa~15 MPa.

[0012] Preferably, in the induction stage of the aging process, the aging degree is proportional to the leakage current value; in the initial stage of the aging process, the aging degree is proportional to both the leakage current value and the tensile deformation.

[0013] The present invention also provides a composite insulator shed material aging process characterization system based on tensile deformation and leakage current, comprising: Aging performance hyperbola acquisition module, used to simultaneously collect the variation curve A of the tensile deformation value of the aging test sample with the aging time and the variation curve B of the leakage current value with the aging time under constant tensile stress; The aging process stage analysis module is used to analyze the variation curve A of the tensile deformation with the aging time and the variation curve B of the leakage current value with the aging time, and determine the induction stage and initial stage of the aging process.

[0014] Preferably, the aging test sample is a dumbbell-shaped sample, and the sample surface other than the thin neck middle section of the dumbbell-shaped sample is covered with a conductive electrode.

[0015] Preferably, the time period when the leakage current value in the leakage current value versus aging time variation curve B in the aging process stage analysis module first increases is the induction stage of the aging process; after the induction stage, the time period until the tensile deformation value in the tensile deformation value versus aging time variation curve A shows a sudden change is the initial stage of the aging process.

[0016] Preferably, in the aging process stage analysis module, in the induction stage of the aging process, the aging degree is proportional to the leakage current value; in the initial stage of the aging process, the aging degree is proportional to both the leakage current value and the tensile deformation.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a method for characterizing the aging process of composite insulator shed materials based on tensile deformation and leakage current. Through the curve A of the tensile deformation value versus aging time and the curve B of the leakage current value versus aging time of the aging test sample obtained simultaneously in the above method, the time point of the aging induction stage of the shed silicone rubber material and the time point of the initial stage of aging of the shed silicone rubber material can be found, and the performance of the aging induction stage and the initial stage of the shed silicone rubber material can be characterized. The method realizes efficient characterization of the aging process of the silicone rubber material by simultaneously measuring and analyzing the changes in the tensile deformation value and the leakage current value in real time, and solves the problem of not being able to measure in real time and being difficult to determine the aging stage in the prior art. The traditional aging evaluation method mainly relies on static test results, while the present invention can more accurately evaluate the aging process stage of the material through dynamic data analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic flow chart of the method for characterizing the aging process of composite insulator shed materials based on tensile deformation and leakage current of the present invention; Figure 2 It is a schematic diagram of the composite insulator shed material aging process characterization system based on tensile deformation and leakage current of the present invention; Figure 3 Schematic diagram of a curve B showing a change in leakage current value versus aging time and a curve A showing a change in tensile deformation amount versus aging time in an embodiment of the present invention; Figure 4 is a schematic diagram of an aging test sample of the present invention; Figure 5 It is a schematic diagram of the test device of the present invention; Figure 6 is a schematic diagram of an electronic device in an embodiment of the present invention; Among them: 1-dumbbell-shaped sample; 2-conductive electrode; 3-aging test box; 4-fixed fixture; 5-tensile movable fixture; 6-current testing device; 7-high voltage DC power supply; 8-grounding device; 9-surface structure observation device. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0020] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0021] The existing methods for studying the aging laws of silicone rubber materials are mainly based on static testing, that is, measuring the performance changes of materials at specific time points before and after the aging treatment. There are several significant problems with the above method: since measurements can only be performed at specific time points before and after the aging treatment, it is impossible to capture the changes in material properties in real time, especially the subtle changes in the early and inducing stages of aging. In order to find the inducing and initial stages of aging, a large number of aging time points need to be set, and repeated sampling and testing are performed, which greatly increases the workload. Traditional methods usually only focus on a single performance indicator (such as tensile strength or leakage current), while the aging of silicone rubber materials is a complex process involving the common changes of multiple performance indicators. Therefore, the measurement of a single indicator cannot fully reflect the aging state of the material.

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings: See also Figure 1 This embodiment provides a method for characterizing the aging process of composite insulator shed materials based on tensile deformation and leakage current, comprising the following steps: S1: Simultaneously collect the curve A of the change of tensile deformation value with aging time and the curve B of the change of leakage current value with aging time of the aging test sample under constant tensile stress; S2: Analyze the variation curve A of the tensile deformation with the aging time and the variation curve B of the leakage current value with the aging time to determine the induction stage and the initial stage of the aging process.

[0023] Among them, the time period when the leakage current value in the curve B of the change of leakage current value with aging time first increases is the induction stage of the aging process, reflecting the beginning of microstructural changes inside the material; after the induction stage, the time period until the tensile deformation value in the curve A of the change of tensile deformation value with aging time suddenly changes is the initial stage of the aging process. The sudden change of tensile deformation value indicates that the aging of the material has entered an initial stage. The degree of aging at this time can be characterized by the joint change of tensile deformation value and leakage current value.

[0024] The characterization method provided in this embodiment realizes real-time monitoring of the aging process of silicone rubber materials by simultaneously collecting tensile deformation and leakage current values, without the need for sampling and testing at multiple time points, which greatly reduces the workload. By analyzing the change curves of tensile deformation and leakage current values, the induction stage and initial stage of aging can be accurately judged, providing strong support for in-depth research on the aging mechanism of silicone rubber materials. This method comprehensively considers the two important performance indicators of tensile deformation and leakage current, and can more comprehensively reflect the performance changes of silicone rubber materials during the aging process.

[0025] In summary, the characterization method provided in the above content effectively solves the problem in the prior art that the aging induction and development process of the silicone rubber material of the composite insulator shed is unclear and lacks effective characterization means.

[0026] In one embodiment, the aging test sample is a dumbbell-shaped sample 1, and the sample surface other than the thin neck middle section of the dumbbell-shaped sample 1 is covered with a conductive electrode 2. Covering the conductive electrode 2 is completed under a stretching condition, and the stretching condition is that the deformation amount of the dumbbell-shaped sample 1 exceeds the elastic deformation range.

[0027] In one embodiment, the constant tensile stress is 0.1 MPa-15 MPa.

[0028] In one embodiment, in the induction stage of the aging process, the aging degree is proportional to the leakage current value; in the initial stage of the aging process, the aging degree is proportional to both the leakage current value and the tensile deformation.

[0029] See also Figure 2The present embodiment further provides an aging process characterization system for composite insulator shed materials based on tensile deformation and leakage current, including an aging performance hyperbola acquisition module and an aging process stage analysis module, wherein the aging performance hyperbola acquisition module is used to simultaneously collect a curve A of the tensile deformation amount versus aging time and a curve B of the leakage current value versus aging time of an aging test sample under a constant tensile stress; the aging process stage analysis module is used to analyze the curve A of the tensile deformation amount versus aging time and the curve B of the leakage current value versus aging time to determine the induction stage and the initial stage of the aging process.

[0030] Among them, the time period when the leakage current value in the leakage current value variation curve B in the aging process stage analysis module first increases is the induction stage of the aging process; after the induction stage, the time period until the tensile deformation value in the tensile deformation value variation curve A with the aging time shows a sudden change is the initial stage of the aging process.

[0031] In the aging process stage analysis module, in the induction stage of the aging process, the aging degree is proportional to the leakage current value; in the initial stage of the aging process, the aging degree is proportional to both the leakage current value and the tensile deformation.

[0032] See also Figure 5 This embodiment also provides a device for realizing the above-mentioned simultaneous real-time testing of the tensile deformation and leakage current value of the aging test sample, the device comprising an aging test box 3, a fixed fixture 4, a tensile movable fixture 5, a current testing device 6, a high-voltage DC power supply 7, a grounding device 8 and a surface structure observation device 9; The fixed clamp 4 and the stretchable movable clamp 5 are relatively arranged inside the aging test box 3, and the surface structure observation device 9 is facing the aging test sample between the fixed clamp 4 and the stretchable movable clamp 5. The fixed clamp 4 and the stretchable movable clamp 5 constitute a stretching clamp for clamping the aging test sample. The current testing device 6 and the high-voltage DC power supply 7 are respectively connected to the conductive electrodes 2 at both ends of the aging test sample, and the grounding device 8 is connected to the current testing device 6.

[0033] In a specific embodiment, a method for characterizing the aging process of composite insulator shed materials based on tensile deformation and leakage current is provided, comprising the following steps: Step 1: simultaneously collect the variation curve A of the tensile deformation value of the aging test sample with the aging time and the variation curve B of the leakage current value with the aging time under constant tensile stress; Step 2: Analyze the variation curve A of the tensile deformation with aging time and the variation curve B of the leakage current value with aging time to determine the induction stage and initial stage of the aging process.

[0034] Among them, see Figure 3 The time period when the leakage current value in the curve B of the change of leakage current value with aging time first increases is the induction stage of the aging process; after the induction stage, the time period until the tensile deformation value in the curve A of the change of tensile deformation value with aging time suddenly changes is the initial stage of the aging process.

[0035] Before the above step 1, the aging test samples are pretreated and tested as follows: See also Figure 4 , prepare a dumbbell-shaped sample 1, and then cover the sample surface other than the middle section of the thin neck of the dumbbell-shaped sample 1 with a conductive electrode 2 to obtain an aging test sample; The aging test samples are subjected to a thermal-mechanical combined aging test under a constant tensile stress, and the tensile deformation and leakage current value of the aging test samples are tested in real time; the constant tensile stress is 0.1MPa~15Mpa; The sample surface other than the middle section of the thin neck of the dumbbell-shaped sample 1 is covered with the conductive electrode 2 under a stretching condition, and the stretching condition is that the deformation amount of the dumbbell-shaped sample 1 exceeds the elastic deformation range.

[0036] See also Figure 5 The specific process of conducting a thermal-mechanical combined aging test on the aging test sample under a constant tensile stress and simultaneously testing the tensile deformation and leakage current value of the aging test sample in real time is as follows: The aging test sample is fixed in a tensile fixture, the aging environment of the aging test is set, and the leakage current test loop is connected. The conductive electrodes 2 at both ends of the aging test sample are respectively connected to the high-voltage DC power supply 7 and the current testing device 6; one end of the aging test sample not connected to the high-voltage DC power supply 7 is connected to the current testing device 6, and the current testing device 6 is connected to the grounding device 8 to test the leakage current value in real time.

[0037] A constant tensile stress is applied to the tensile fixture, and a DC voltage is applied to one end of the aging test sample connected to the high-voltage DC power supply 7. The test voltage amplitude is set, and the tensile deformation and leakage current value of the aging test sample are continuously recorded. The test is stopped when both the tensile deformation and the leakage current value change significantly.

[0038] The aging environment of the above-mentioned aging test includes an accelerated aging atmosphere and an accelerated aging temperature; the accelerated aging atmosphere is an oxygen-containing atmosphere, and the oxygen-containing atmosphere includes ozone, oxygen or air; the temperature range of the accelerated aging temperature is 20°C~300°C; the amplitude range of the DC voltage is 100V~10kV.

[0039] Preferably, while continuously recording the tensile deformation and leakage current value of the aging test sample, the surface morphology of the aging test sample can also be observed, and the surface morphology observation is performed by the surface structure observation device 9 .

[0040] In another embodiment, the aging test sample is subjected to the following pretreatment and test process: A dumbbell-shaped silicone rubber sample is prepared for the tensile test, and the sample surface other than the middle section of the thin neck of the dumbbell-shaped sample 1 is covered with a conductive electrode 2 to obtain an aging test sample, which can realize the combined test of tensile deformation and leakage current; A thermal-mechanical combined aging test is performed on the aging test sample in the aging test box 3, and an accelerated aging test and synchronous measurement of tensile deformation and surface leakage current of the sample are completed at the same time.

[0041] Among them, the silicone rubber sample is the material used for the umbrella skirt of the composite insulator. The sheet sample can be prepared by hot pressing the high-temperature vulcanized silicone rubber raw material, and then cut into a dumbbell-shaped sample 1. The sheet sample can also be directly cut from the umbrella skirt of the composite insulator and then cut into a dumbbell-shaped sample 1; the part other than the middle section of the thin neck of the dumbbell-shaped sample 1 is covered with a conductive electrode 2, so that it can carry out a mechanical tensile test and can also test the leakage current at the same time.

[0042] The silicone rubber sample is sheet-shaped in the thickness direction, and is dumbbell-shaped in length and width, with large ends and a small middle, which is convenient for mechanical tensile testing. Subsequently, the thin neck portion of the dumbbell-shaped sample 1 needs to be covered, and the portion of the sample other than the thin neck needs to be covered with a conductive material electrode, which can be covered using spraying, sputtering, or painting. In the electrode preparation process, the upper surface, lower surface, and side surfaces of the sample should all be electrode-covered.

[0043] Among them, it is necessary to complete the covering of the thin neck part and the covering process of other parts of the electrode under the stretching condition to ensure that the leakage current can be measured in the subsequent stretching deformation process of the sample. The stretching condition requires the deformation to exceed the elastic deformation range.

[0044] In the aging test box 3, a thermal-mechanical combined aging test is carried out, and the tensile deformation and leakage current of the sample are tested in real time. Oxygen or ozone can be contained in the aging test box 3 to accelerate the aging process. The above-mentioned aging test is to complete the thermal-mechanical combined aging test of the silicone rubber dumbbell sample under the conditions of accelerated aging temperature, accelerated aging atmosphere, and certain mechanical tensile stress.

[0045] The functions of the aging test box 3 include: the cavity temperature can be adjusted, the atmosphere environment in the cavity can be changed, it contains a mechanical stretching device and a strain acquisition device, it contains a current testing device 6, a high-voltage DC power supply 7, a grounding device 8, and a surface structure observation device 9.

[0046] The above-mentioned thermal-mechanical combined aging test has the following characteristics: the tensile stress range is: 0.1MPa~15MPa; the accelerated aging atmosphere is: ozone, oxygen, air and other oxygen-containing atmospheres; the accelerated aging temperature range is: 20℃~300℃.

[0047] During the combined aging test, the deformation of the silicone rubber sample needs to be monitored. A DC voltage with an amplitude range of 100V to 10kV needs to be applied to one side of the silicone rubber sample. The other side is grounded after passing through the current testing device 6, and the leakage current value is tested in real time.

[0048] The specific process of the above test is as follows: Fix the aging test sample in the fixed fixture 4 and the tensile movable fixture 5; Set the temperature and atmosphere of the aging test box 3; the atmosphere is an oxygen-containing atmosphere; connect the leakage current test loop, and connect the conductive electrodes 2 at both ends of the aging test sample to the high-voltage DC power supply 7 and the current test device 6 respectively; A constant tensile stress is applied to the tensile fixture, and the tensile deformation, leakage current value and surface morphology of the sample are continuously recorded. The test is stopped when both the tensile deformation and leakage current value change significantly.

[0049] The constant tensile stress value was changed, and the above steps were repeated on multiple samples to complete the combined aging test under different stress conditions.

[0050] In this embodiment, a method for characterizing the aging process of composite insulator shed materials based on tensile deformation and leakage current is provided, which is as follows: At the same time, the variation curve A of the tensile deformation of the aging test sample with the aging time and the variation curve B of the leakage current value with the aging time are collected under constant tensile stress; The tensile deformation data and leakage current data of the aging test samples were studied (analyzing the curve A of the tensile deformation value changing with the aging time and the curve B of the leakage current value changing with the aging time), and the induction stage and initial stage of the aging of the silicone rubber material were analyzed through the mutation points of the tensile deformation data and the leakage current data.

[0051] Among them, the variation law of tensile deformation with aging time and leakage current with aging time under constant tensile stress are recorded, namely, curve A of tensile deformation with aging time and curve B of leakage current with aging time. The time period of the first rising process of leakage current is recorded as the aging induction stage, and the time period from the end of the induction stage to the moment of tensile deformation mutation is recorded as the initial aging stage. The variation law of leakage current is used to reflect the characteristics of the aging induction stage of silicone rubber samples, and the degree of aging is proportional to the leakage current value; the variation law of tensile strain and leakage current are used to reflect the characteristics of the initial aging stage of silicone rubber samples, and the degree of aging is proportional to the leakage current value and tensile strain.

[0052] In summary, the characterization method provided in this embodiment solves the problem in the prior art that the aging induction and development process of the silicone rubber material of the composite insulator shed is unclear and there is a lack of effective characterization means.

[0053] See also Figure 6 As shown, in one embodiment, an electronic device 100 is provided for implementing a method for characterizing an aging process of a composite insulator shed material based on tensile deformation and leakage current; the electronic device 100 includes a memory 101, at least one processor 102, a computer program 103 stored in the memory 101 and executable on the at least one processor 102, and at least one communication bus 104.

[0054] The memory 101 can be used to store the computer program 103. The processor 102 implements the steps of the method for characterizing the aging process of composite insulator shed materials based on tensile deformation and leakage current described in the above embodiment by running or executing the computer program stored in the memory 101 and calling the data stored in the memory 101. The memory 101 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area can store data (such as audio data) created according to the use of the electronic device 100, etc. In addition, the memory 101 can include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other non-volatile solid-state storage devices.

[0055] The at least one processor 102 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor 102 may be a microprocessor or any conventional processor, etc. The processor 102 is the control center of the electronic device 100, and uses various interfaces and lines to connect various parts of the entire electronic device 100.

[0056] The memory 101 in the electronic device 100 stores a plurality of instructions to implement a method for characterizing an aging process of a composite insulator shed material based on tensile deformation and leakage current, and the processor 102 may execute the plurality of instructions to implement: At the same time, the variation curve A of the tensile deformation of the aging test sample with the aging time and the variation curve B of the leakage current value with the aging time are collected under constant tensile stress; The variation curve A of the tensile deformation with the aging time and the variation curve B of the leakage current with the aging time are analyzed to determine the induction stage and the initial stage of the aging process.

[0057] If the module / unit integrated in the electronic device 100 is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the process in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory and read-only memory (ROM, Read-Only Memory).

[0058] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0059] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0060] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0061] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for characterizing the aging process of composite insulator shed materials based on tensile deformation and leakage current, characterized in that: include: At the same time, the variation curve A of the tensile deformation of the aging test sample with the aging time and the variation curve B of the leakage current value with the aging time are collected under constant tensile stress; The variation curve A of the tensile deformation with the aging time and the variation curve B of the leakage current with the aging time are analyzed to determine the induction stage and the initial stage of the aging process.

2. The method for characterizing the aging process of composite insulator shed materials based on tensile deformation and leakage current according to claim 1 is characterized in that: The aging test sample is a dumbbell-shaped sample, and the sample surface other than the thin neck middle section of the dumbbell-shaped sample is covered with a conductive electrode.

3. The method for characterizing the aging process of composite insulator shed materials based on tensile deformation and leakage current according to claim 2 is characterized in that: The covering of the conductive electrode is completed under a stretching condition, and the stretching condition is that the deformation amount of the dumbbell-shaped sample exceeds the elastic deformation range.

4. The method for characterizing the aging process of composite insulator shed materials based on tensile deformation and leakage current according to claim 1 is characterized in that: The time period when the leakage current value first rises in the curve B of the change of leakage current value with aging time is the induction stage of the aging process; after the induction stage, the time period until the tensile deformation value in the curve A of the change of tensile deformation value with aging time shows a sudden change is the initial stage of the aging process.

5. The method for characterizing the aging process of composite insulator shed materials based on tensile deformation and leakage current according to claim 1, characterized in that: The constant tensile stress is 0.1MPa~15Mpa.

6. The method for characterizing the aging process of composite insulator shed materials based on tensile deformation and leakage current according to claim 1 is characterized in that: In the induction stage of the aging process, the aging degree is proportional to the leakage current value; in the initial stage of the aging process, the aging degree is proportional to both the leakage current value and the tensile deformation.

7. A composite insulator shed material aging process characterization system based on tensile deformation and leakage current, characterized in that: include: Aging performance hyperbola acquisition module, used to simultaneously collect the variation curve A of the tensile deformation value of the aging test sample with the aging time and the variation curve B of the leakage current value with the aging time under constant tensile stress; The aging process stage analysis module is used to analyze the variation curve A of the tensile deformation with the aging time and the variation curve B of the leakage current value with the aging time, and determine the induction stage and initial stage of the aging process.

8. The composite insulator shed material aging process characterization system based on tensile deformation and leakage current according to claim 7 is characterized in that: The aging test sample is a dumbbell-shaped sample, and the sample surface other than the thin neck middle section of the dumbbell-shaped sample is covered with a conductive electrode.

9. The composite insulator shed material aging process characterization system based on tensile deformation and leakage current according to claim 7, characterized in that: The time period when the leakage current value in the leakage current value versus aging time curve B in the aging process stage analysis module first increases is the induction stage of the aging process; after the induction stage, the time period until the tensile deformation value in the tensile deformation value versus aging time curve A shows a sudden change is the initial stage of the aging process.

10. The composite insulator shed material aging process characterization system based on tensile deformation and leakage current according to claim 7, characterized in that: In the aging process stage analysis module, in the induction stage of the aging process, the aging degree is proportional to the leakage current value; in the initial stage of the aging process, the aging degree is proportional to both the leakage current value and the tensile deformation.

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