Method and system for calculating crisp and decayed length of crisp and decayed composite insulator

Abstract

The invention discloses a method and a system for calculating the crisp and decayed length of a crisp and decayed composite insulator. The current strategy cannot meet the requirement of flexibly determining the power failure defect elimination time according to the position of a crisp and decayed section of an actual insulator chain. The method comprises the following steps: carrying out infrared temperature measurement on the crisp and decay composite insulator to obtain an infrared spectrum of the crisp and decay composite insulator; obtaining a heating far-end position of the composite insulator according to an infrared spectrum of the crisp and decayed composite insulator; obtaining the total length of the composite insulator according to the infrared spectrum of the crisp and decayed composite insulator; and combining the heating far-end position of the composite insulator with the total length of the composite insulator to obtain the composite insulator rotten length. According to the method, a basis is provided for automatic processing of a composite insulator infrared inspection image, automatic extraction of a heating position, on-site defect grading of the crisp and decayed composite insulator and defect elimination time selection based on a digital system, and a foundation is laid for subsequent performance evaluation of the crisp and decayed composite insulator string.

Description

Technical Field

[0001] The present invention belongs to the technical field of power grid composite insulators, and relates to the intelligent automatic extraction of the heating positions of rotten composite insulators. Specifically, it is a method and system for calculating the rotten length of rotten composite insulators. Background Art

[0002] The scale of composite insulators in operation in the power grid is huge. In recent years, the defects of rotten composite insulators have occurred frequently. The rotten defects will cause the mechanical properties of the composite insulator core rods to decline, and when it develops to a certain extent, it will cause the string to break.

[0003] At present, due to the lack of data on the mechanical properties of pre-rotten composite insulators and the lack of characteristic parameters to characterize the severity of rottenness, it is impossible to determine the internal rotten section position of rotten composite insulators through on-site live detection. Therefore, the strategy of immediate defect elimination can only be adopted for pre-rotten insulators. Currently, the 500 kV lines mainly adopt the method of power outage for defect elimination. However, the performance tests of rotten composite insulators show that in fact, the internal defect degree of some rotten insulators is relatively light and they can still operate for a certain period of time. During peak load periods such as summer peak load and winter peak load, it is very difficult to cut off the power supply of the line. Power outage for defect elimination may lead to the reduction of the power output of the converter station and power outages in some areas. The disposal strategy of immediate power outage for rotten composite insulators cannot meet the power supply guarantee requirements. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the above-mentioned existing technologies, and provide a method and system for calculating the rotten length of rotten composite insulators. By detecting the on-site rotten composite insulators, obtaining the infrared spectrum of the insulators, and then obtaining the heating far-end position of the composite insulator through artificial intelligence image analysis means, and further obtaining the rotten length of the composite insulator string, so as to provide a basis for the automatic processing of infrared inspection images of composite insulators, the automatic extraction of heating positions, the defect grading of on-site rotten composite insulators, and the selection of defect elimination time based on a digital system, and lay a foundation for the subsequent performance evaluation of rotten composite insulator strings.

[0005] For this reason, a technical solution adopted by the present invention is as follows: A method for calculating the rotten length of a rotten composite insulator, which includes the steps of: a) Performing infrared temperature measurement on the rotten composite insulator to obtain the infrared spectrum of the rotten composite insulator; b) Obtaining the heating far-end position of the composite insulator according to the infrared spectrum of the rotten composite insulator; c) Obtaining the total length of the composite insulator according to the infrared spectrum of the rotten composite insulator; d) Combining the heating far-end position of the composite insulator with the total length of the composite insulator to obtain the rotten length of the composite insulator.

[0006] Further, in step b), the position of the far end of the heat generation of the composite insulator is obtained through the following steps: b1) Segment the infrared image of the composite insulator obtained through step a), extract the components of the composite insulator in the infrared image, and extract the geometric features of the composite insulator; b2) Determine the relative position of the heat generation point of the insulator in the components of the composite insulator extracted in step b1) through the insulator heat generation point position calibration module, so as to calibrate the specific position of the heat generation point of the composite insulator and obtain the position of the far end of the heat generation of the composite insulator.

[0007] Furthermore, the insulator heat generation point position calibration module in step b2) is specifically used for: regarding the components of the composite insulator extracted in step b1) as a rectangular frame, extracting the temperatures of the points on the central axis of the rectangle, obtaining the maximum value among the temperatures of the points on the central axis, and the specific position of the heat generation point of the composite insulator corresponding to the maximum temperature is the position of the far end of the heat generation of the composite insulator.

[0008] Furthermore, the position of the far end of the heat generation of the composite insulator, that is, the proportion of the length from the heat generation point of the composite insulator to the high-voltage end in the length of the composite insulator component, is calculated as follows: h_hot = h / B; where h_hot is the proportion of the length from the heat generation point of the composite insulator to the high-voltage end in the length of the composite insulator component; h is the number of pixel points from the heat generation point of the composite insulator to the high-voltage end; B is the number of pixel points of the composite insulator component.

[0009] Further, in step c), the total length of the composite insulator is obtained through the following steps: c1) Extract the <tower type, seasonal time, integrity> information contained in the composite insulator component obtained through step b1), screen the complete insulator reference template library, and obtain the corresponding partial library in the complete insulator reference template library; c2) Extract the <L, W, A, P, Hup, Hux, X, Q> information contained in the composite insulator component obtained through step b1), where: L represents the image length, W represents the image width, A represents the image area, P represents the image perimeter, Hup represents the translation value of the image in the Hu matrix, Hux represents the rotation degree of the image in the Hu matrix, X represents the set of image pixel points, and Q represents the number of umbrella skirts; The results obtained in step c1) and step c2) are both input into the composite insulator similarity detection module, and the output results are two values: the total length Lsum of the composite insulator; the proportion of the composite insulator component in the complete insulator, and the calculation formula is as follows: h_part = B / Llong; Among them, h_part is the proportion of the composite insulator component in the length of the complete insulator; Llong is the number of pixel points of the complete insulator.

[0010] Furthermore, the complete insulator reference template library is obtained through the following steps: c1.1) Through a large number of composite insulator images collected historically and cumulatively, ensuring coverage of different angles, lighting conditions, and shooting environments, thereby forming a complete insulator reference template library. Each composite insulator vector in the complete insulator reference template library includes the following information: <Tower type, seasonal time, integrity>; <L, W, A, P, Hup, Hux, X, Q> information.

[0011] Furthermore, the composite insulator similarity detection module is specifically used for: c2.1) According to the infrared image taken of a composite insulator to be inspected, extract the <L, W, A, P, Hup, Hux, X, Q> information it contains, and match it with the corresponding part library in the complete insulator reference template library obtained in step c1). The matching condition is the minimum value of the similarity calculation between each composite insulator in the corresponding part library and the composite insulator to be inspected.

[0012] Still further, the calculation formula for the matching condition is as follows:

[0013] Among them, the subscript x of each variable represents the xth composite insulator in the corresponding part library, x = 1, 2,..., n; the subscript 0 of each variable represents the composite insulator to be inspected; represents the proportion coefficient of the image length in the similarity, represents the proportion coefficient of the image width in the similarity, represents the proportion coefficient of the image area in the similarity, represents the proportion coefficient of the image perimeter in the similarity, represents the proportion coefficient of Hup in the similarity, represents the proportion coefficient of Hux in the similarity; represents the proportion coefficient of the image pixel point set in the similarity, represents the proportion coefficient of the number of umbrella skirts in the similarity.

[0014] Further, in step d), the obtained length of the deteriorated composite insulator is obtained through the following steps: d1.1) Obtain the output results of the insulator heating point position calibration module in step b2.1): the proportion h_hot of the length of the heating point of the composite insulator from the high-voltage end in the length of the composite insulator component, and the two output results of the composite insulator similarity detection module: the total length Lsum of the composite insulator and the proportion h_part of the insulator component in the complete insulator; d1.2) Calculate the decayed length Lloss of the composite insulator, and the calculation formula is as follows: Lloss=(h_hot)*(h_part)*Lsum Among them, Lloss represents the decayed length of the composite insulator; h_hot is the proportion of the length of the heating point of the insulator from the high-voltage end in the length of the insulator component.

[0015] The present invention also provides a system for calculating the decayed length of a decayed composite insulator, which is used to implement the method for calculating the decayed length of a decayed composite insulator, and includes: Infrared spectrum acquisition unit: perform infrared temperature measurement on the decayed composite insulator to obtain the infrared spectrum of the decayed composite insulator; Heating far-end position acquisition unit: obtain the heating far-end position of the composite insulator according to the infrared spectrum of the decayed composite insulator; Total length acquisition unit of the composite insulator: obtain the total length of the composite insulator according to the infrared spectrum of the decayed composite insulator; Decayed length acquisition unit of the composite insulator: obtain the decayed length of the composite insulator by combining the heating far-end position of the composite insulator with the total length of the composite insulator.

[0016] Compared with the prior art, the present invention analyzes the infrared spectrum obtained from the on-site detection of the composite insulator, obtains the heating far-end position of the composite insulator through artificial intelligence image analysis means, and then obtains the decayed length of the composite insulator string, so as to provide a basis for the automatic processing of infrared inspection images of composite insulators based on a digital system, the automatic extraction of heating positions, the defect grading of on-site decayed composite insulators, and the selection of defect elimination time, and lay a foundation for the subsequent performance evaluation of the decayed composite insulator string. Description of the Drawings

[0017] Figure 1 It is a flowchart of a method for calculating the decayed length of a decayed composite insulator according to the present invention; Figure 2 It is a flowchart for obtaining the heating far-end position of the decayed composite insulator according to the present invention; Figure 3 It is a flowchart for obtaining the total length of the complete composite insulator according to the present invention; Figure 4 It is a structural block diagram of the formation process of the reference template library of the complete insulator according to the present invention; Figure 5 It is the infrared detection map of on-site brittle and decayed insulators in the specific implementation manner of the present invention; Figure 6 It is the composition diagram of a brittle and decayed length calculation system for a brittle and decayed composite insulator of the present invention. Specific implementation manner

[0018] The following combines the drawings of the present invention to explain and illustrate the technical solutions of the embodiments of the present invention. However, the following embodiments are only the preferred embodiments of the present invention, not all of them. Based on the embodiments in the implementation manner, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present invention.

[0019] Embodiment 1 This embodiment is a method for calculating the brittle and decayed length of a brittle and decayed composite insulator. As Figure 1 shown, the steps are as follows: a) Perform infrared temperature measurement on the brittle and decayed composite insulator to obtain the infrared map of the brittle and decayed composite insulator; b) According to the infrared map of the brittle and decayed composite insulator, obtain the position of the heat generation far end of the composite insulator; c) According to the infrared map of the brittle and decayed composite insulator, obtain the total length of the composite insulator; d) Combine the position of the heat generation far end of the composite insulator and the total length of the composite insulator to obtain the brittle and decayed length of the composite insulator.

[0020] Specifically, in step b), the position of the heat generation far end of the composite insulator is obtained through the following steps. As Figure 2 shown: b1) Through the infrared map of the composite insulator obtained in step a), segment the infrared image of the composite insulator, extract the composite insulator components in the infrared image, and extract the geometric features of the composite insulator to describe the composite insulator; b2) The insulator heat generation point position calibration module calibrates the specific position of the heat generation point of the composite insulator by judging the relative position of the insulator heat generation point in the insulator components extracted in step b1), and obtains the position of the heat generation far end of the composite insulator.

[0021] Specifically, the insulator heat generation point position calibration module in step b2) is specifically used for: b2.1) Regard the composite insulator components extracted in step b1) as a rectangular frame, extract the temperatures of each point on the central axis of the rectangle, obtain the maximum value among the temperatures of each point on the central axis, and the specific position of the composite insulator heat generation point corresponding to the maximum temperature is the position of the heat generation far end of the composite insulator.

[0022] The position of the far end of the heat generation of the composite insulator, that is, the proportion of the length from the heat generation point of the composite insulator to the high-voltage end in the length of the composite insulator component, is calculated as follows: h_hot = h / B; where h_hot is the proportion of the length from the heat generation point of the composite insulator to the high-voltage end in the length of the composite insulator component; h is the number of pixel points from the heat generation point of the composite insulator to the high-voltage end; B is the number of pixel points of the composite insulator component.

[0023] Specifically, in step c), the total length of the composite insulator is obtained through the complete insulator reference template library and the composite insulator similarity detection module. The total length of the composite insulator is obtained through the following steps, as Figure 3 shown: c1) From the insulator component obtained in step b1), extract the <tower type, seasonal time, integrity> information contained in the insulator component, and screen the complete insulator reference template library to obtain the corresponding partial library in the complete insulator reference template library; c2) From the insulator component obtained in step b1), extract the <L, W, A, P, Hup, Hux, X, Q> information contained in the insulator component (where: L represents the image length, W represents the width, A represents the area, P represents the perimeter, Hup represents the translation value of the image in the Hu matrix, Hux represents its rotation degree, X represents its pixel point set, Q represents the number of umbrella skirts), and input them together with the corresponding partial library in the complete insulator reference template library obtained in step c1) into the composite insulator similarity detection module. The output results are two values: 1. The length of the complete insulator corresponding to the insulator component found, which is the total length Lsum of the composite insulator; 2. The proportion of the insulator component in the complete insulator, and the calculation formula is as follows: h_part = l / Llong; where h_part is the proportion of the composite insulator component in the length of the complete insulator; l is the number of pixel points of the composite insulator component; Llong is the number of pixel points of the complete insulator.

[0024] Specifically, in step c1), the complete insulator reference template library, as Figure 4 shown, is obtained through the following steps: c1.1) Through a large number of composite insulator images collected historically and cumulatively, ensure coverage of different angles, lighting conditions, and shooting environments, so as to form a complete insulator reference template library. Each composite insulator vector in the complete insulator reference template library includes the following information: <tower type, seasonal time, integrity> <L, W, A, P, Hup, Hux, X, Q> Where: L represents the image length, W represents the width, A represents the area, P represents the perimeter, Hup represents the translation value of the image in the Hu matrix, Hux represents its rotation degree, X represents its set of pixel points, and Q represents the number of umbrella skirts.

[0025] Specifically, in step c2), the composite insulator similarity detection module is specifically used for: c2.1) Extract the <L, W, A, P, Hup, Hux, X, Q> information contained in the infrared image of a composite insulator to be inspected, and match it with the corresponding part library in the complete insulator reference template library obtained in step c1). The matching condition is the minimum value of the similarity calculation between each composite insulator in the corresponding part library and the composite insulator to be inspected.

[0026] The calculation formula for the matching condition is as follows:

[0027] Among them, the subscript x of each variable represents the x-th composite insulator in the corresponding part library, x = 1, 2,..., n; the subscript 0 of each variable represents the composite insulator to be inspected; represents the proportion coefficient of the image length in the similarity, represents the proportion coefficient of the image width in the similarity, represents the proportion coefficient of the image area in the similarity, represents the proportion coefficient of the image perimeter in the similarity, represents the proportion coefficient of Hup in the similarity, represents the proportion coefficient of Hux in the similarity; represents the proportion coefficient of the image pixel point set in the similarity, represents the proportion coefficient of the number of umbrella skirts in the similarity.

[0028] Specifically, in step d), the decayed length of the composite insulator is obtained through the following steps: d1.1) Obtain the output results of the insulator heating point position calibration module in step b2.1): the proportion h_hot of the length of the heating point of the composite insulator from the high-voltage end in the length of the composite insulator component, and the two output results of the composite insulator similarity detection module in step c2.1): the total length Lsum of the composite insulator and the proportion h_part of the insulator component in the complete insulator; d1.2) Calculate the decayed length Lloss of the composite insulator. The calculation formula is as follows: Lloss=(h_hot)*(h_part)*Lsum.

[0029] Taking a 500 kV brittle composite insulator as an example, the brittle section length of the heating position of this insulator is obtained by applying the brittle composite insulator length calculation method of the present invention as follows: 1) Infrared temperature measurement is performed on the brittle composite insulator to obtain the infrared spectrum of the composite insulator. The infrared spectrum of this composite insulator is as Figure 5 shown; 2) According to the infrared spectrum of the brittle composite insulator, after being processed by the insulator heating point position calibration module, the proportion of the distal position of the insulator heating in the insulator component (the insulator component in the captured infrared spectrum is an incomplete string insulator) is obtained, and the value is 13.27%; 3) According to the infrared spectrum of the brittle composite insulator, after being processed by the complete insulator reference template library and the composite insulator similarity detection module, the output results are: 1. The total length Lsum of the composite insulator, with a value of 5.2 m; 2. The proportion h_part of the insulator component in the complete insulator, with a value of 94.23%; 4) Obtain the proportion h_hot of the distal position of the insulator heating in the insulator component, with a value of 13.27%; the total length Lsum of the complete insulator, with a value of 5.2 m; the proportion h_part of the insulator component in the complete insulator, with a value of 94.23%. After calculation, Lloss=(h_hot)*(h_part)*Lsum=(13.27%)*(94.23%)*(5.2)=0.65 m. The brittle section length of this brittle composite insulator is 0.65 m.

[0030] Example 2 This embodiment provides a brittle length calculation system for brittle composite insulators, which is used to implement the brittle length calculation method for brittle composite insulators described above. It consists of an infrared spectrum acquisition unit, a distal heating position acquisition unit, a total length acquisition unit for composite insulators, and a brittle length acquisition unit for composite insulators, as Figure 6 shown.

[0031] Infrared spectrum acquisition unit: Perform infrared temperature measurement on the brittle composite insulator to obtain the infrared spectrum of the brittle composite insulator; Distal heating position acquisition unit: According to the infrared spectrum of the brittle composite insulator, obtain the distal heating position of the composite insulator; Total length acquisition unit for composite insulators: According to the infrared spectrum of the brittle composite insulator, obtain the total length of the composite insulator; Brittle length acquisition unit for composite insulators: Combine the distal heating position of the composite insulator and the total length of the composite insulator to obtain the brittle length of the composite insulator.

[0032] It should be noted that each unit in the above-mentioned decay length calculation system of the decay composite insulator can be implemented in whole or in part by software, hardware, and their combination. Each of the above units can be embedded in or independent of the processor in the computer device in the form of hardware, or stored in the memory in the computer device in the form of software, so as to facilitate the processor to call and execute the operations corresponding to each of the above units. For the specific limitations of a decay length calculation system of a decay composite insulator, refer to the limitations of a decay length calculation method of a decay composite insulator (i.e., Embodiment 1) in the above text. The two have the same functions and effects, and will not be elaborated here.

[0033] The above description of the embodiments is to facilitate the understanding and application of the present invention by ordinary technicians in the technical field. Those skilled in the art can obviously make various modifications to the above embodiments easily, and apply the general principles described here to other embodiments without creative labor. Therefore, the present invention is not limited to the above embodiments, and all improvements and modifications made by those skilled in the art according to the disclosure of the present invention should be within the protection scope of the present invention.

Claims

1. A method for calculating the decay length of a decay composite insulator, characterized in that, Including the steps: a) Conduct infrared temperature measurement on the brittle composite insulator to obtain the infrared spectrum of the brittle composite insulator; b) Obtain the remote heat - generating position of the composite insulator according to the infrared spectrum of the brittle composite insulator; c) Obtain the total length of the composite insulator according to the infrared spectrum of the brittle composite insulator; d) Combine the remote heat - generating position of the composite insulator and the total length of the composite insulator to obtain the brittle length of the composite insulator.

2. The method for calculating the decay length of the decay composite insulator according to claim 1, characterized in that In step b), the remote heat - generating position of the composite insulator is obtained through the following steps: b1) Segment the infrared image of the composite insulator through the infrared spectrum of the brittle composite insulator obtained in step a), extract the composite insulator components in the infrared image, and extract the geometric features of the composite insulator; b2) Determine the relative position of the insulator heat - generating point in the composite insulator components extracted in step b1) through the insulator heat - generating point position calibration module, realize the calibration of the specific position of the insulator heat - generating point, and obtain the remote heat - generating position of the composite insulator.

3. The method for calculating the deteriorated length of the deteriorated composite insulator according to claim 2, wherein, The insulator heat - generating point position calibration module in step b2) is specifically used for: regarding the composite insulator components extracted in step b1) as a rectangular frame, extracting the temperatures of each point on the central axis of the rectangle, obtaining the maximum value among the temperatures of each point on the central axis, and the specific position of the composite insulator heat - generating point corresponding to the maximum temperature is the remote heat - generating position of the composite insulator.

4. The method for calculating the decay length of the decay composite insulator according to claim 3, characterized in that, The remote heat - generating position of the composite insulator, that is, the proportion h_hot of the length from the heat - generating point of the composite insulator to the high - voltage end in the length of the composite insulator component, is calculated as follows: h_hot = h / B; where h is the number of pixel points from the heat - generating point of the composite insulator to the high - voltage end; B is the number of pixel points of the composite insulator component.

5. The method for calculating the decay length of the decay composite insulator according to claim 1, wherein In step c), the total length of the composite insulator is obtained through the following steps: c1) Extract the <tower type, seasonal time, integrity> information contained in the composite insulator component obtained in step b1), screen the complete insulator reference template library, and obtain the corresponding partial library in the complete insulator reference template library; c2) Extract the <L, W, A, P, Hup, Hux, X, Q> information contained in the composite insulator component obtained in step b1), where: L represents the image length, W represents the image width, A represents the image area, P represents the image perimeter, Hup represents the translation value of the image in the Hu matrix, Hux represents the rotation degree of the image in the Hu matrix, X represents the set of image pixel points, and Q represents the number of umbrella skirts; The results obtained in step c1) and step c2) are both input into the composite insulator similarity detection module, and the output results are two values: the total length Lsum of the composite insulator; the proportion of the composite insulator component in the complete insulator, and the calculation formula is as follows: h_part = B / Llong; where h_part is the proportion of the composite insulator component in the length of the complete insulator; B is the number of pixel points of the composite insulator component; Llong is the number of pixel points of the complete insulator.

6. The method for calculating the decay length of the brittle composite insulator according to claim 5, wherein The complete insulator reference template library is obtained through the following steps: c1.1) Through a large number of composite insulator images collected cumulatively over history, ensuring coverage of different angles, lighting conditions, and shooting environments, thus forming a complete insulator reference template library. Each composite insulator vector in the complete insulator reference template library includes the following information: <Tower type, seasonal time, integrity>; <L, W, A, P, Hup, Hux, X, Q> information.

7. The method for calculating the decay length of the decay composite insulator according to claim 5, characterized in that, The described composite insulator similarity detection module is specifically used for: c2.1) According to the infrared image taken of a composite insulator to be inspected, extract the <L, W, A, P, Hup, Hux, X, Q> information it contains, and match it with the corresponding partial library in the complete insulator reference template library obtained in step c1). The matching condition is the minimum value of the similarity calculation between each composite insulator in the corresponding partial library and the composite insulator to be inspected.

8. The method for calculating the decay length of the decay composite insulator according to claim 7, characterized in that, The calculation formula for the matching condition is as follows: ， Among them, the subscript x of each variable represents the x-th composite insulator in the corresponding partial library, where x = 1, 2, …, n; the subscript 0 of each variable represents the composite insulator to be inspected. represents the proportion coefficient of the image length in the similarity, represents the proportion coefficient of the image width in the similarity, represents the proportion coefficient of the image area in the similarity, represents the proportion coefficient of the image perimeter in the similarity, represents the proportion coefficient of Hup in the similarity, represents the proportion coefficient of Hux in the similarity; represents the proportion coefficient of the image pixel point set in the similarity, represents the proportion coefficient of the number of umbrella skirts in the similarity.

9. The method for extracting the heating position of the crispy and decayed composite insulator based on the infrared spectrum according to claim 5, characterized in that, In step d), the obtaining of the deteriorated length of the composite insulator is obtained through the following steps: d1.1) Obtain the output results of the insulator heating point position calibration module in step b2.1): the proportion h_hot of the length from the heating point of the composite insulator to the high-voltage end in the length of the composite insulator component, and the two output results of the composite insulator similarity detection module: the total length Lsum of the composite insulator and the proportion h_part of the insulator component in the complete insulator; d1.2) Calculate the deteriorated length Lloss of the composite insulator. The calculation formula is as follows: Lloss = (h_hot) * (h_part) * Lsum.

10. A brittle decay length calculation system for brittle decay composite insulators, which is used to implement the brittle decay length calculation method for brittle decay composite insulators according to any one of claims 1-9, characterized in that, Including: Infrared spectrum acquisition unit: Perform infrared temperature measurement on the deteriorated composite insulator to obtain the infrared spectrum of the deteriorated composite insulator; Heating far-end position acquisition unit: According to the infrared spectrum of the deteriorated composite insulator, obtain the heating far-end position of the composite insulator; Composite insulator total length acquisition unit: According to the infrared spectrum of the deteriorated composite insulator, obtain the total length of the composite insulator; Composite insulator deteriorated length acquisition unit: Combine the heating far-end position of the composite insulator and the total length of the composite insulator to obtain the deteriorated length of the composite insulator.

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