Composite insulator aging evaluation method and system

Abstract

The composite insulator aging evaluation method comprises the following steps: applying voltage to a to-be-tested composite insulator to enable the surface charge quantity of the to-be-tested composite insulator to reach a saturated state; acquiring surface potentials of different measuring points on the surface of the to-be-measured composite insulator; determining the charge density of each measurement point according to the surface potential of each measurement point; determining an average value of the charge densities and a standard deviation of the charge densities of the measurement points according to the charge densities of the measurement points; according to the average value of the charge density and the standard deviation of the charge density of each measurement point, determining a variable coefficient of each measurement point; and determining the local aging degree of the surface of the to-be-detected composite insulator according to the variable coefficient, wherein the variable coefficient is positively correlated with the local aging degree. Compared with the prior art, under the condition that the completeness of the to-be-detected composite insulator is guaranteed, the local aging degree of the to-be-detected composite insulator can be detected, and insulators in two shapes, namely the flaky silicone rubber and the composite insulator, can be measured at the same time.

Description

Technical Field

[0001] The invention relates to the field of insulator electrical performance measurement, and in particular to a composite insulator aging assessment method and system. Background Art

[0002] During long-term operation, composite insulators are affected by multiple factors such as environment, mechanics, and electricity, which causes the material properties of composite insulators to gradually degrade. Composite insulators are widely used in power transmission and transformation systems. Their shed design can effectively increase the surface leakage distance and improve the ability to resist contamination. However, due to long-term exposure to complex environments, aging problems are inevitable, which poses a potential threat to the reliability of the transmission system. The main purpose of aging assessment is to determine the remaining life of composite insulators and take appropriate maintenance or replacement measures to ensure the safe operation of the transmission system. Since composite insulators play an important role in insulation and support in power systems, assessing their aging can help identify potential risks in advance and avoid insulation failure caused by aging, resulting in power outages or equipment damage.

[0003] At present, the commonly used aging assessment methods for composite insulators include dielectric performance testing, hydrophobicity testing, infrared spectroscopy analysis, and mechanical performance testing. Since the dielectric performance test is highly sensitive and can accurately capture the degree of degradation of the relevant electrical properties of the insulating material, and the testing method is mature and widely used, the test results have good reliability and repeatability. It can be combined with other test methods to form a comprehensive aging assessment method to provide a more comprehensive aging analysis. However, when measuring electrical performance indicators such as the surface resistivity or volume resistivity of silicone rubber composite insulators, only the electrical performance of the entire composite insulator can be evaluated, which is not sensitive enough for the early detection of local aging, and the actual aging of composite insulators is generally uneven. For example, if there are small cracks or local material performance degradation in the insulator, but it does not cause a significant decrease in the overall dielectric performance, these problems may not be obvious in early tests. Summary of the invention

[0004] The present invention provides a composite insulator aging assessment method and system to solve the technical problem that the existing composite insulator aging assessment method cannot identify local aging.

[0005] To achieve the above object, the present invention adopts the following technical solution.

[0006] A composite insulator aging assessment method comprises the following steps:

[0007] Applying voltage to the composite insulator to be tested so that the surface charge of the composite insulator to be tested reaches a saturation state;

[0008] Obtaining the surface potential of different measuring points on the surface of the composite insulator to be tested;

[0009] Determine the charge density of each measuring point based on the surface potential of each measuring point;

[0010] According to the charge density of each measuring point, determine the average value and standard deviation of the charge density;

[0011] The coefficient of variation was determined based on the mean and standard deviation of the charge density;

[0012] The local aging degree of the surface of the composite insulator to be tested is determined according to the size of the coefficient of variation, wherein the coefficient of variation is positively correlated with the local aging degree.

[0013] In some embodiments, the method further includes: determining a measurement point at which an absolute value of charge density is greater than a set threshold as a point of local aging.

[0014] In some embodiments, the method further includes: sequentially connecting a plurality of adjacent local aging points to form a closed curve to obtain a local aging area.

[0015] In some embodiments, the method of determining the surface potential of the measurement point includes:

[0016] For a circular measurement object, the circular surface is evenly divided into multiple grids, and the corner point of each grid is determined as a measurement point; for a cylindrical measurement object, multiple spaced measurement points are determined along the length direction of the cylinder.

[0017] In some embodiments, the surface potential of each measurement point is measured by a surface potential measuring device, and the surface potential measuring device includes:

[0018] A clamping device for clamping the composite insulator;

[0019] A metal plate is used to place the circular thin-sheet composite insulator, and the metal plate is grounded;

[0020] A first walking mechanism, used for driving the metal plate to move linearly in a direction close to or away from the clamping device;

[0021] A six-degree-of-freedom robotic arm, located above the clamping device and the metal plate;

[0022] The second walking structure is used to drive the six-degree-of-freedom robotic arm to reach the top of the composite insulator or the circular thin-sheet composite insulator;

[0023] an electrostatic capacitance probe, mounted on the movable end of the six-degree-of-freedom robotic arm, and a fixed end of the six-degree-of-freedom robotic arm is mounted on the second walking structure;

[0024] A data collector is connected to the electrostatic capacitance probe for communication; and

[0025] A controller is respectively connected to the first walking mechanism, the second walking mechanism, the six-degree-of-freedom mechanical arm and the data collector for communication;

[0026] An electrode is arranged on the top of the composite insulator, the electrode is connected to a protective resistor, the protective resistor is connected to a first switch, the first switch is connected to the positive electrode of a high-voltage DC power supply; the positive electrode of the high-voltage DC power supply is also connected to a second switch, and the second switch is connected to the needle electrode.

[0027] In some embodiments, the method of measuring the surface potential of each measuring point by the surface potential measuring device includes: placing a needle electrode above the circular thin-sheet composite insulator, closing the second switch, and applying a voltage to the needle electrode to saturate the charge of the circular thin-sheet composite insulator;

[0028] The second switch is turned off, and the circular thin-sheet composite insulator is moved to the position directly below the electrostatic capacitance probe by using the first travel mechanism, and the surface potential of each measuring point on the circular thin-sheet composite insulator is measured by using the electrostatic capacitance probe; at the same time, the first switch is closed, and a voltage is applied to the electrode to saturate the charge of the composite insulator;

[0029] The first switch is turned off, and the electrostatic capacitance probe is moved to the top of the composite insulator by using the second walking structure, and the surface potential of each measuring point on the composite insulator is measured by using the electrostatic capacitance probe.

[0030] In some embodiments, measuring the surface potential of each measuring point on the composite insulator using an electrostatic capacitance probe includes: dividing the composite insulator into two parts: a shed and a sheath;

[0031] For the shed part, the shed surface is evenly divided into multiple grids, and the corner point of each grid is determined as a measurement point; the surface potential of each measurement point on each shed is measured from top to bottom;

[0032] For the sheath portion, a plurality of measuring points at intervals are determined along the length direction of the sheath, and the surface potential of each measuring point on the sheath is measured.

[0033] In some embodiments, the controller controls the six-degree-of-freedom robotic arm so that the electrostatic capacitance probe installed at the free end of the six-degree-of-freedom robotic arm completes the measurement of each measurement point.

[0034] In some embodiments, when the electrostatic capacitance probe measures each measuring point, the controller controls the six-degree-of-freedom robotic arm so that the electrostatic capacitance probe is perpendicular to the surface of the object being measured and the measuring distance is constant.

[0035] Based on the same inventive concept, the present invention also provides a composite insulator aging assessment system, comprising a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the above method.

[0036] The present invention has at least the following technical effects or advantages: the local aging degree of the composite insulator to be tested can be detected while ensuring the integrity of the composite insulator to be tested. The composite insulator aging evaluation method with a surface charge measurement device proposed in the present invention is suitable for evaluating the aging state of composite insulators of various shapes in complex environments, especially for silicone rubber composite insulators that may have local aging in the early stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the process of a composite insulator aging assessment method according to one embodiment of the present invention;

[0038] Figure 2 It is a schematic structural diagram of a surface potential measuring device in one embodiment of the present invention;

[0039] Figure 3 A schematic diagram of circuit connections of a surface potential measuring device in one embodiment of the present invention;

[0040] Figure 4 is a surface charge density distribution diagram of a sheath in one embodiment of the present invention;

[0041] Figure 5 Schematic diagram of mesh division of the shed surface in one embodiment of the present invention;

[0042] Figure 6 : is a surface charge density distribution diagram of the upper shed in one embodiment of the present invention;

[0043] Figure 7 Graph showing the surface charge density distribution of the lower shed in one embodiment of the present invention. DETAILED DESCRIPTION

[0044] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0045] See also Figure 1 , a composite insulator aging assessment method, the method comprising the following steps:

[0046] Applying voltage to the composite insulator to be tested so that the surface charge of the composite insulator to be tested reaches a saturation state;

[0047] Obtaining the surface potential of different measuring points on the surface of the composite insulator to be tested;

[0048] Determine the charge density of each measuring point based on the surface potential of each measuring point;

[0049] According to the charge density of each measuring point, determine the average value and standard deviation of the charge density;

[0050] The coefficient of variation was determined based on the mean and standard deviation of the charge density;

[0051] The local aging degree of the surface of the composite insulator to be tested is determined according to the size of the coefficient of variation, wherein the coefficient of variation is positively correlated with the local aging degree.

[0052] Specifically, after obtaining the surface potential of different measuring points on the surface of the composite insulator to be measured, the surface charge density of each measuring point can be calculated by the following formula:

[0053]

[0054] Where: i is the surface charge density at the i-th measurement point; ε0 is the dielectric constant in vacuum; ε r is the relative dielectric constant of the composite insulator to be tested; d is the thickness of the composite insulator to be tested at the measuring point; V i is the surface potential of the ith measurement point.

[0055] The average charge density It can be calculated by the following formula:

[0056]

[0057] Where: n is the total number of measurement points;

[0058] The standard deviation s of the charge density can be calculated by the following formula:

[0059]

[0060] The coefficient of variation CV can be calculated using the following formula:

[0061]

[0062] The coefficient of variation CV is usually expressed in percentage form, i.e., CV×100%. In this embodiment, when the coefficient of variation of the surface charge density is less than 5%, it is considered that the local aging degree of the surface of the composite insulator to be tested is in a good state; when the coefficient of variation of the surface charge density is within the range of 10% to 15%, it is considered that the local aging degree of the surface of the composite insulator to be tested is in a warning state; when the coefficient of variation of the surface charge density is greater than 15%, it is considered that the local aging degree of the surface of the composite insulator to be tested is in an abnormal state.

[0063] Preferably, the method may further include the step of determining the local aging position according to the value of the charge density: determining the measurement point where the absolute value of the charge density is greater than a set threshold as the local aging point; and sequentially connecting a plurality of adjacent local aging points to form a closed curve to obtain the local aging area. In this embodiment, the set threshold may be set to 50 μC*m 2 .like Figure 6 and Figure 7 As shown, the blue area in the figure can be identified as the area of ​​local aging.

[0064] Preferably, the method for determining the surface potential of a measurement point comprises:

[0065] For a circular measurement object, the circular surface is evenly divided into multiple grids, and the corner point of each grid is determined as a measurement point; for a cylindrical measurement object, multiple spaced measurement points are determined along the length direction of the cylinder.

[0066] In the above method, the surface potential of each measuring point can be measured by an existing measuring device.

[0067] Preferably, the surface potential of each measuring point can also be measured by a surface potential measuring device provided by the present invention. The structure diagram of the surface potential measuring device is as shown in FIG. Figure 2 As shown, the circuit connection diagram is as follows Figure 3 As shown, including:

[0068] A clamping device 1, used for clamping a composite insulator 2;

[0069] The metal plate 3 is used to place the circular thin-sheet composite insulator 4, and the metal plate 3 is grounded;

[0070] The first walking mechanism 41 is used to drive the metal plate 3 to move linearly in a direction close to or away from the clamping device 1;

[0071] A six-degree-of-freedom robotic arm 5 is located above the clamping device 1 and the metal plate 3;

[0072] The second walking structure 42 is used to drive the six-degree-of-freedom robot arm 5 to reach the top of the composite insulator 2 or the circular thin-sheet composite insulator 4;

[0073] The electrostatic capacitance probe 6 is mounted on the movable end of the six-degree-of-freedom mechanical arm 5, and the fixed end of the six-degree-of-freedom mechanical arm 5 is mounted on the second walking structure 42;

[0074] A data collector 7 is connected to the electrostatic capacitance probe 6 for communication; and

[0075] The controller 8 is respectively connected to the first walking mechanism 41, the second walking mechanism 42, the six-degree-of-freedom robot arm 5 and the data collector 7 for communication;

[0076] An electrode 21 is provided on the top of the composite insulator 2 , and the electrode 21 is connected to a protective resistor R, and the protective resistor R is connected to a first switch K1 , and the first switch K1 is connected to the positive electrode of the high-voltage DC power supply 10 ; the positive electrode of the high-voltage DC power supply 10 is also connected to a second switch K2 , and the second switch K2 is connected to the needle electrode 11 .

[0077] The measurement method includes the following steps:

[0078] S1, place the needle electrode 11 above the circular thin-sheet composite insulator 4, close the second switch K2, and apply voltage to the needle electrode 11 to make the charge on the surface of the circular thin-sheet composite insulator 4 reach a saturated state. In this embodiment, the voltage of the high-voltage DC power supply 10 is configured to be -40 kV. After applying voltage to the needle electrode 11 for 5 minutes, the charge on the surface of the circular thin-sheet composite insulator 4 can reach a saturated state.

[0079] S2, turn off the second switch K2, use the first travel mechanism 41 to move the circular thin-sheet composite insulator 4 to the position directly below the electrostatic capacitance probe 6, and use the electrostatic capacitance probe 6 to measure the surface potential of each measuring point on the circular thin-sheet composite insulator 4; at the same time, close the first switch K1, apply voltage to the electrode 21 to saturate the charge on the surface of the composite insulator 2. In this embodiment, after applying voltage to the electrode 21 for 60 minutes, the charge on the surface of the composite insulator 2 can reach a saturated state.

[0080] S3, turn off the first switch K1, use the second walking structure 42 to move the electrostatic capacitance probe 6 to the top of the composite insulator 2, and use the electrostatic capacitance probe 6 to measure the surface potential of each measuring point on the composite insulator 2. At this point, the surface potential measurement of the composite insulator 2 and the circular thin-sheet composite insulator 4 is completed.

[0081] When the electrostatic capacitance probe 6 measures the surface potential of each measuring point on the composite insulator 2 and the circular thin-sheet composite insulator 4,

[0082] For the composite insulator 2, the composite insulator 2 is divided into two parts: a shed and a sheath; for the shed part, the shed surface is evenly divided into a plurality of grids, and the corner point of each grid is determined as a measuring point; the surface potential of each measuring point on each shed is measured from top to bottom; for the sheath part, a plurality of spaced measuring points are determined along the length direction of the sheath, and the surface potential of each measuring point on the sheath is measured.

[0083] For the circular thin-sheet composite insulator 4, the circular thin-sheet composite insulator 4 is evenly divided into a plurality of grids, and a corner point of each grid is determined as a measuring point; the surface potential of each measuring point on each shed is measured sequentially from top to bottom.

[0084] The grid division method is: first divide the surface into multiple concentric circles, and then measure the surface potential at 12° intervals on each circumference to measure the surface potential of each measurement point. Figure 5 shown.

[0085] During measurement, the controller 8 controls the six-degree-of-freedom mechanical arm 5 so that the electrostatic capacitance probe 6 installed at the free end of the six-degree-of-freedom mechanical arm 5 is installed according to the above plan to complete the measurement of each measuring point. During measurement, the electrostatic capacitance probe 6 is perpendicular to the surface of the object being measured and the measuring distance is constant at 3mm. This can be achieved through existing technology, such as the three-dimensional motion control system disclosed in Feng Wang, Dexiong Hu, Lipeng Zhong, et al. 2024.05.09, Surface Charge Dissipation Characteristics of Al2O3 / Silicone Rubber Composites.

[0086] Figure 4 , Figure 6 and Figure 7 The surface charge density distribution diagrams of the sheath, upper shed and lower shed are shown in Figure 1. By calculating the coefficient of variation of each position, the coefficients of variation of the surface charge density of the sheath, upper shed and lower shed are 1.75%, 6.86% and 10.65% respectively, that is, the coefficient of variation of the surface charge density of the sheath part of the measured composite insulator is within 5%, which is in a good state, the coefficient of variation of the surface charge density of the upper shed part is within 5% to 10%, which is in a general state, and the coefficient of variation of the surface charge density of the lower shed part is within 10% to 15%, which is judged to be a warning state, which needs to be paid attention to and early warning.

[0087] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0088] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the intention that the claimed invention requires more features than those expressly recited in each claim. Rather, as reflected in the claims, inventive aspects lie in less than all of the features of the individual embodiments previously disclosed. Therefore, the claims that follow the detailed description are hereby expressly incorporated into the detailed description, with each claim itself serving as a separate embodiment of the present invention.

[0089] Those skilled in the art will appreciate that the modules or units or groups of the devices in the examples disclosed herein may be arranged in the device as described in the embodiment, or alternatively may be located in one or more devices different from the devices in the example. The modules in the foregoing examples may be combined into one module or may be divided into multiple submodules.

[0090] Those skilled in the art will appreciate that the modules in the devices in the embodiments may be adaptively changed and arranged in one or more devices different from the embodiments. The modules or units or groups in the embodiments may be combined into one module or unit or group, and in addition they may be divided into a plurality of submodules or subunits or subgroups. Except that at least some of such features and / or processes or units are mutually exclusive, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this manner may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature providing the same, equivalent or similar purpose.

[0091] Furthermore, those skilled in the art will appreciate that although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features from different embodiments is meant to be within the scope of the present invention and to form different embodiments.

[0092] In addition, some of the embodiments are described herein as methods or combinations of method elements that can be implemented by a processor of a computer system or by other devices that perform the functions. Therefore, a processor with necessary instructions for implementing the method or method elements forms a device for implementing the method or method elements. In addition, the elements described herein of the device embodiments are examples of devices for implementing the functions performed by the elements for the purpose of implementing the invention.

[0093] The various techniques described herein may be implemented in combination with hardware or software, or a combination thereof. Thus, the method and apparatus of the present invention, or some aspects or portions of the method and apparatus of the present invention may be in the form of program codes (i.e., instructions) embedded in a tangible medium, such as a floppy disk, a CD-ROM, a hard disk drive, or any other machine-readable storage medium, wherein when the program is loaded into a machine such as a computer and executed by the machine, the machine becomes a device for practicing the present invention.

[0094] In the case where the program code is executed on a programmable computer, the computing device generally includes a processor, a storage medium readable by the processor (including volatile and non-volatile memory and / or storage elements), at least one input device, and at least one output device. The memory is configured to store the program code; the processor is configured to execute the method of the present invention according to the instructions in the program code stored in the memory.

[0095] By way of example and not limitation, computer readable media include computer storage media and communication media. Computer readable media include computer storage media and communication media. Computer storage media stores information such as computer readable instructions, data structures, program modules or other data. Communication media generally embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and includes any information delivery medium. Any combination of the above is also included within the scope of computer readable media.

[0096] As used herein, unless otherwise specified, the use of ordinal numbers "first," "second," "third," etc. to describe common objects merely indicates that different instances of similar objects are involved, and is not intended to imply that the objects so described must have a given order in time, space, order, or in any other manner.

[0097] Although the present invention has been described according to a limited number of embodiments, it will be apparent to those skilled in the art, with the benefit of the above description, that other embodiments may be envisioned within the scope of the invention thus described. In addition, it should be noted that the language used in this specification is selected primarily for readability and teaching purposes, rather than for explaining or defining the subject matter of the present invention. Therefore, many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the appended claims. The disclosure of the present invention is illustrative, not restrictive, with respect to the scope of the present invention, which is defined by the appended claims.

[0098] Finally, it should be noted that the present invention does not explain in detail the common knowledge recognized by technicians in this field. The above is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A composite insulator aging assessment method, characterized in that: The method comprises the following steps: Applying voltage to the composite insulator to be tested so that the surface charge of the composite insulator to be tested reaches a saturation state; Obtaining the surface potential of different measuring points on the surface of the composite insulator to be tested; Determine the charge density of each measuring point based on the surface potential of each measuring point; According to the charge density of each measuring point, determine the average value and standard deviation of the charge density; The coefficient of variation was determined based on the mean and standard deviation of the charge density; The local aging degree of the surface of the composite insulator to be tested is determined according to the size of the coefficient of variation, wherein the coefficient of variation is positively correlated with the local aging degree.

2. The composite insulator aging assessment method according to claim 1, characterized in that: Also includes: The measurement point where the absolute value of the charge density is greater than the set threshold is determined as the point of local aging.

3. The composite insulator aging assessment method according to claim 2, characterized in that: Also includes: Multiple adjacent local aging points are connected in sequence to form a closed curve to obtain a local aging area.

4. The composite insulator aging assessment method according to any one of claims 1 to 3, characterized in that: The method for determining the surface potential of the measuring point comprises: For a circular measurement object, the circular surface is evenly divided into multiple grids, and the corner point of each grid is determined as a measurement point; for a cylindrical measurement object, multiple spaced measurement points are determined along the length direction of the cylinder.

5. The composite insulator aging assessment method according to any one of claims 1 to 3, characterized in that: The surface potential of each measuring point is measured by a surface potential measuring device, and the surface potential measuring device includes: A clamping device for clamping the composite insulator; A metal plate is used to place the circular thin-sheet composite insulator, and the metal plate is grounded; A first walking mechanism, used for driving the metal plate to move linearly in a direction close to or away from the clamping device; A six-degree-of-freedom robotic arm, located above the clamping device and the metal plate; The second walking structure is used to drive the six-degree-of-freedom robotic arm to reach the top of the composite insulator or the circular thin-sheet composite insulator; an electrostatic capacitance probe, mounted on the movable end of the six-degree-of-freedom robotic arm, and a fixed end of the six-degree-of-freedom robotic arm is mounted on the second walking structure; A data collector is connected to the electrostatic capacitance probe for communication; and A controller is respectively connected to the first walking mechanism, the second walking mechanism, the six-degree-of-freedom mechanical arm and the data collector for communication; An electrode is arranged on the top of the composite insulator, the electrode is connected to a protective resistor, the protective resistor is connected to a first switch, the first switch is connected to the positive electrode of a high-voltage DC power supply; the positive electrode of the high-voltage DC power supply is also connected to a second switch, and the second switch is connected to the needle electrode.

6. The composite insulator aging assessment method according to claim 5, characterized in that: The method for measuring the surface potential of each measuring point by the surface potential measuring device comprises: The needle electrode is placed above the circular thin-sheet composite insulator, the second switch is closed, and a voltage is applied to the needle electrode so that the charge on the surface of the circular thin-sheet composite insulator reaches a saturated state; The second switch is turned off, and the circular thin-sheet composite insulator is moved to the position directly below the electrostatic capacitance probe by using the first travel mechanism, and the surface potential of each measuring point on the circular thin-sheet composite insulator is measured by using the electrostatic capacitance probe; at the same time, the first switch is closed, and a voltage is applied to the electrode so that the charge on the surface of the composite insulator reaches a saturated state; The first switch is turned off, and the electrostatic capacitance probe is moved to the top of the composite insulator by using the second walking structure, and the surface potential of each measuring point on the composite insulator is measured by using the electrostatic capacitance probe.

7. The composite insulator aging assessment method according to claim 6, characterized in that: The surface potential of each measuring point on the composite insulator is measured using an electrostatic capacitance probe, including: The composite insulator is divided into two parts: the shed and the sheath; For the shed part, the shed surface is evenly divided into multiple grids, and the corner point of each grid is determined as a measurement point; the surface potential of each measurement point on each shed is measured from top to bottom; For the sheath portion, a plurality of measuring points at intervals are determined along the length direction of the sheath, and the surface potential of each measuring point on the sheath is measured.

8. The composite insulator aging assessment method according to claim 7, characterized in that: The controller controls the six-degree-of-freedom mechanical arm so that the electrostatic capacitance probe installed at the free end of the six-degree-of-freedom mechanical arm completes the measurement of each measurement point.

9. The composite insulator aging assessment method according to claim 8, characterized in that: When the electrostatic capacitance probe measures each measuring point, the controller controls the six-degree-of-freedom robotic arm so that the electrostatic capacitance probe is perpendicular to the surface of the object being measured and the measuring distance is constant.

10. A composite insulator aging assessment system, comprising a memory, a processor, and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the method according to any one of claims 1 to 3.

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