Method and system for detecting zero-value insulator based on electric field intensity change degree

Abstract

The invention discloses a method and system for detecting a zero-value insulator based on the change degree of electric field intensity, and the method comprises the following steps: generating a detection path position based on the spatial distribution condition of the electric field intensity of an insulator string, obtaining the signal data information of the electric field intensity of the insulator string, and constructing an electric field intensity curve of the insulator string; based on an insulator string electric field model, insulator sheet electric field intensity change feature recognition extraction processing is carried out on the insulator electric field intensity curve, electric field intensity feature extraction processing results of the insulator sheet with the electric field intensity abnormally and suddenly reduced and the adjacent insulator sheet are obtained, and electric field intensity change degree judgment processing is carried out; determining whether the insulator sheet is a zero-value insulator sheet or a low-value insulator sheet; the electric field intensity change degree judgment processing is performed on the insulator string electric field intensity signal data information based on the insulator string electric field model to determine the number of zero-value insulator sheets and low-value insulator sheets so as to judge whether the insulation degree of the insulator string is qualified or not.

Description

Technical Field

[0001] The present invention belongs to the technical field of power auxiliary equipment detection, and in particular relates to a method and system for detecting zero-value insulators based on the degree of change of electric field strength. Background Art

[0002] In order to ensure the safe and stable operation of the transmission lines, the power grid company will carry out measurement and maintenance work on the insulation degree of the insulator strings in the transmission lines every year. At present, most of them use resistance measurement method (the measurement time is too long and the efficiency is low), voltage measurement method (cannot accurately distinguish zero value and low value insulators), and infrared imaging measurement method (cannot accurately distinguish zero value and low value insulators) to detect the insulation degree of the insulator string. However, when performing zero value detection on the disc-shaped suspension insulator string of the UHV line, it is easy to be affected by external factors, and it is inevitable that the insulation detection error of the insulator string will occur, resulting in the insulation detection result of the entire string of insulators being misjudged as low value or zero value. Even if a new insulator string with good quality is installed or other qualified zero value detectors are replaced, the same situation still exists. Moreover, the above-mentioned current insulation detection method of the insulator string cannot accurately, quickly and efficiently detect and determine which insulator pieces of the insulator string are zero value insulators and low value insulators, and cannot replace the insulator pieces in time. Therefore, the above-mentioned current insulator string insulation detection method cannot guarantee the validity of the detection result, hinders the smooth implementation of UHV line maintenance work, and threatens the safe and stable operation of UHV transmission lines. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a method and system for detecting zero-value insulators based on the degree of change of electric field strength, by determining the degree of change of electric field strength of the electric field strength signal data information of the insulator string based on the electric field model of the insulator string to determine the number of zero-value insulator pieces and low-value insulator pieces, thereby determining whether the insulation degree of the insulator string is qualified to ensure the safe and stable operation of the high-voltage line.

[0004] The technical solution of the present invention is: The first aspect of the present application provides a method for detecting a zero-value insulator based on a degree of change in electric field strength, comprising the following steps: S101, acquiring transmission line data information and insulator string structure data information, constructing a transmission line insulator model and determining the spatial distribution of the electric field strength of the insulator string; S102, generating a detection path position based on the spatial distribution of the electric field strength of the insulator string, obtaining the electric field strength signal data information of the insulator string and constructing an electric field strength curve of the insulator string; S103, based on the insulator string electric field model, the insulator electric field strength curve is subjected to identification and extraction processing of the electric field strength variation characteristics of the insulator segments, and the electric field strength feature extraction processing results of the insulator segments with abnormal and sudden drop in electric field strength and the adjacent insulator segments are obtained; S104, based on the insulator string electric field model, extract the electric field strength feature of the insulator segment with abnormally sudden drop in electric field strength and its adjacent insulator segments, and perform electric field strength change degree determination processing to determine whether it is a zero-value insulator segment or a low-value insulator segment; S105. Based on the number of zero-value insulator pieces and the number of low-value insulator pieces, determine whether the insulation degree of the insulator string is qualified, and generate an insulator string insulation degree report.

[0005] Furthermore, the transmission line data information includes the transmission line voltage and the distance between the transmission lines, and the insulator string structure data information includes the number of insulator pieces, insulator shape, insulator material and insulator string length.

[0006] Furthermore, obtaining the data information of the transmission line and the structure data information of the insulator string, constructing the transmission line insulator model and determining the spatial distribution of the electric field strength of the insulator string includes the following steps: Based on the data information of the transmission conductor and the structure data information of the insulator string, a transmission line insulator model is constructed; Based on the transmission line voltage, the number of insulators, the insulator material and the length of the insulator string as the input data of the transmission line insulator model, the electric field intensity distribution of the insulator string is obtained; Based on the voltage floating range of the transmission line and the distance between the transmission lines as the input data of the transmission line insulator model, the superposition variation range of the electric field intensity of the insulator string is obtained; Based on the electric field intensity distribution of the insulator string and the superposition variation range of the electric field intensity of the insulator string, the spatial distribution of the electric field intensity of the insulator string is obtained.

[0007] Furthermore, the insulator string electric field strength signal data information includes the electric field strength of the first insulator segment, the electric field strength of the second insulator segment, the electric field strength of the third insulator segment...the electric field strength of the Nth insulator segment.

[0008] Further, generating a detection path based on the spatial distribution of the electric field strength of the insulator string, obtaining the electric field strength signal data information of the insulator string and constructing the electric field strength curve of the insulator string includes the following steps: Generate a detection path location plan based on the spatial distribution of the electric field strength of the insulator string and the transmission line insulator model; By selecting one of the detection path position schemes, the electric field strength signal data information at different positions of the insulator string is obtained based on the time series, and the insulator piece marking processing is performed on the insulator string; Based on the electric field strength signal data information at different positions of the insulator string and the insulator piece marking processing results, the electric field strength curve of the insulator string is constructed.

[0009] Furthermore, the detection path location scheme includes a first detection path location scheme, a second detection path location scheme, a third detection path location scheme, ... an Nth detection path location scheme.

[0010] Furthermore, constructing the electric field model of the insulator string includes the following steps: Based on the electric field strength signal data information of the insulator string without abnormal insulator pieces and the electric field strength signal data information of the insulator string with abnormal insulator pieces, an electric field strength curve of the insulator string without abnormal insulator pieces and an electric field strength curve of the insulator string with abnormal insulator pieces are constructed respectively; The electric field strength curve of the insulator string without abnormal insulator segments and the electric field strength curve of the insulator string with abnormal insulator segments are used to train the electric field model of the insulator string; If the model training results are the same as the training sample results, the training is completed; if the model training results are different from the training sample results, the training is repeated.

[0011] Furthermore, based on the insulator string electric field model, the insulator electric field strength curve is subjected to identification and extraction processing of the electric field strength variation characteristics of the insulator segments, and the electric field strength feature extraction processing results of the insulator segments with abnormally sudden drop in electric field strength and the adjacent insulator segments are obtained, including the following steps: Based on the insulator string electric field model, the insulator electric field strength curve is used to identify the increase characteristics of the insulator electric field strength; Based on the insulator string electric field model, the insulator electric field strength curve is used to identify the electric field strength reduction characteristics of the insulator segment; Based on the feature recognition results of the increase in the electric field strength of the insulator segment and the feature recognition results of the decrease in the electric field strength of the insulator segment, the electric field strength features of the insulator segments adjacent to the insulator segment with the abnormal and sudden drop in electric field strength are extracted and processed to obtain the electric field strength feature extraction and processing results of the insulator segment with the abnormal and sudden drop in electric field strength and its adjacent insulator segments.

[0012] Further, based on the insulator string electric field model, the electric field strength feature extraction processing results of the insulator segment with abnormally sudden drop in electric field strength and its adjacent insulator segments are processed to determine the degree of change of electric field strength to determine whether it is a zero-value insulator segment or a low-value insulator segment, including the following steps: Based on the insulator string electric field model, the electric field strength feature extraction processing results of the insulator segment with abnormal and sudden drop in electric field strength and its adjacent insulator segments are used to calculate the electric field strength change rate; Based on the calculation result of the electric field intensity change rate, a determination process of the degree of change of the electric field intensity is performed; If the result of the electric field strength change degree determination processing is greater than or equal to the electric field strength change degree zero value setting threshold, the insulator segment with abnormal sudden drop in electric field strength is determined to be a zero value insulator segment; If the result of the electric field strength change degree determination processing is less than the electric field strength change degree zero value setting threshold and greater than or equal to the electric field strength change degree low value setting threshold, the insulator segment with abnormally sudden drop in electric field strength is determined to be a low-value insulator segment.

[0013] Further, based on the number of zero-value insulator pieces and the number of low-value insulator pieces, determining whether the insulation degree of the insulator string is qualified and generating an insulation degree report of the insulator string includes the following steps: If the number of zero-value insulators and the number of low-value insulators are less than the threshold of the number of bad insulators set based on the voltage level of the transmission line, the insulation degree of the insulator string is determined to be qualified, and an insulation degree report of the insulator string is generated; If the number of zero-value insulator pieces and the number of low-value insulator pieces are greater than or equal to the threshold number of bad insulator pieces set based on the voltage level of the transmission line, the insulation level of the insulator string is determined to be unqualified, and an insulator string insulation level report is generated.

[0014] A second aspect of the present application provides a system for detecting a zero-value insulator based on a degree of change in electric field strength, comprising: A first model building unit is used to build a transmission line insulator model and determine the spatial distribution of the electric field strength of the insulator string based on the transmission line data information and the insulator string structure data information; A first data processing unit is used to generate a detection path position based on the spatial distribution of the electric field strength of the insulator string, obtain the electric field strength signal data information of the insulator string and construct an electric field strength curve of the insulator string; The second model building unit is used to build an insulator string electric field model; The second data processing unit is used to perform identification and extraction processing of the electric field strength variation characteristics of the insulator segments on the insulator electric field strength curve based on the insulator string electric field model, and obtain the electric field strength feature extraction processing results of the insulator segments with abnormal and sudden drop in electric field strength and their adjacent insulator segments; The third data processing unit is used to extract and process the electric field strength characteristics of the insulator segment with abnormal and sudden drop in electric field strength and its adjacent insulator segments based on the insulator string electric field model, and perform electric field strength change degree determination processing to determine whether it is a zero-value insulator segment or a low-value insulator segment; The fourth data processing unit is used to determine whether the insulation degree of the insulator string is qualified based on the number of zero-value insulator pieces and the number of low-value insulator pieces, and generate an insulation degree report of the insulator string.

[0015] Furthermore, the first model building unit builds a transmission line insulator model based on the transmission line data information and the insulator string structure data information and determines the spatial distribution of the electric field strength of the insulator string, including: Based on the data information of the transmission conductor and the structure data information of the insulator string, a transmission line insulator model is constructed; Based on the transmission line voltage, the number of insulators, the insulator material and the length of the insulator string as the input data of the transmission line insulator model, the electric field intensity distribution of the insulator string is obtained; Based on the voltage floating range of the transmission line and the distance between the transmission lines as the input data of the transmission line insulator model, the superposition variation range of the electric field intensity of the insulator string is obtained; Based on the electric field intensity distribution of the insulator string and the superposition variation range of the electric field intensity of the insulator string, the spatial distribution of the electric field intensity of the insulator string is obtained.

[0016] Furthermore, the first data processing unit generates a detection path position based on the spatial distribution of the electric field strength of the insulator string, obtains the electric field strength signal data information of the insulator string and constructs the electric field strength curve of the insulator string, including: Generate a detection path location plan based on the spatial distribution of the electric field strength of the insulator string and the transmission line insulator model; By selecting one of the detection path position schemes, the electric field strength signal data information at different positions of the insulator string is obtained based on the time series, and the insulator piece marking processing is performed on the insulator string; Based on the electric field strength signal data information at different positions of the insulator string and the insulator piece marking processing results, the electric field strength curve of the insulator string is constructed.

[0017] Furthermore, the second data processing unit performs identification and extraction processing of the electric field strength variation characteristics of the insulator segments on the insulator electric field strength curve based on the insulator string electric field model, and obtains the electric field strength feature extraction processing results of the insulator segments with abnormally sudden drop in electric field strength and their adjacent insulator segments, including: Based on the insulator string electric field model, the insulator electric field strength curve is used to identify the increase characteristics of the insulator electric field strength; Based on the insulator string electric field model, the insulator electric field strength curve is used to identify the characteristics of the insulator segment electric field strength reduction; Based on the feature recognition results of the increase in the electric field strength of the insulator segment and the feature recognition results of the decrease in the electric field strength of the insulator segment, the electric field strength features of the insulator segments adjacent to the insulator segment with the abnormal and sudden drop in electric field strength are extracted and processed to obtain the electric field strength feature extraction and processing results of the insulator segment with the abnormal and sudden drop in electric field strength and its adjacent insulator segments.

[0018] Furthermore, the third data processing unit extracts the electric field strength feature of the insulator segment with abnormally sudden drop in electric field strength and its adjacent insulator segments based on the insulator string electric field model, and performs electric field strength change degree determination processing to determine whether it is a zero-value insulator segment or a low-value insulator segment. The process includes: Based on the insulator string electric field model, the electric field strength feature extraction processing results of the insulator segment with abnormal and sudden drop in electric field strength and its adjacent insulator segments are used to calculate the electric field strength change rate; Based on the calculation result of the electric field intensity change rate, a determination process of the degree of change of the electric field intensity is performed; If the result of the electric field strength change degree determination processing is greater than or equal to the electric field strength change degree zero value setting threshold, the insulator segment with abnormal sudden drop in electric field strength is determined to be a zero value insulator segment; If the result of the electric field strength change degree determination processing is less than the electric field strength change degree zero value setting threshold and greater than or equal to the electric field strength change degree low value setting threshold, the insulator segment with abnormally sudden drop in electric field strength is determined to be a low-value insulator segment.

[0019] Further, the fourth data processing unit determines whether the insulation degree of the insulator string is qualified based on the number of zero-value insulator pieces and the number of low-value insulator pieces, and generates an insulation degree report of the insulator string including: If the number of zero-value insulators and the number of low-value insulators are less than the threshold of the number of bad insulators set based on the voltage level of the transmission line, the insulation degree of the insulator string is determined to be qualified, and an insulation degree report of the insulator string is generated; If the number of zero-value insulator pieces and the number of low-value insulator pieces are greater than or equal to the threshold number of bad insulator pieces set based on the voltage level of the transmission line, the insulation level of the insulator string is determined to be unqualified, and an insulator string insulation level report is generated.

[0020] Beneficial effects of this application: The present invention realizes the determination and processing of the degree of change of the electric field strength of the insulator string electric field strength signal data information based on the insulator string electric field model, so as to determine the number of zero-value insulator pieces and low-value insulator pieces, thereby determining whether the insulation degree of the insulator string is qualified, so as to ensure the safe and stable operation of the high-voltage line.

[0021] It is possible to construct a transmission line insulator model through transmission conductor data information and insulator string structure data information to obtain the spatial distribution of the electric field strength of the insulator string. The electric field strength can be measured at a certain distance from the insulator string, which greatly ensures the safety of zero-value insulator detection.

[0022] It is achieved by determining the optimal detection path location plan based on the spatial distribution of the electric field strength of the insulator string and the transmission line insulator model to obtain the electric field strength signal data information at different positions of the insulator string, thereby greatly ensuring the accuracy and reliability of zero-value insulator detection.

[0023] By simultaneously extracting and processing the electric field strength characteristics of the two adjacent insulator pieces on the left and right of the insulator piece where the electric field strength has dropped abnormally, the degree of change of the electric field strength of the insulator piece where the electric field strength has dropped abnormally can be obtained, and the insulation of the insulator piece can be judged according to the degree of change of the electric field strength, thereby further improving the accuracy of zero-value insulator detection.

[0024] By determining the processing result according to the degree of change of the electric field strength, it is possible to determine whether the insulator piece with abnormally sudden drop in electric field strength is a zero-value insulator piece or a low-value insulator piece, thereby greatly improving the detection accuracy of the insulation degree of the insulator piece.

[0025] By comparing the number of zero-value insulator pieces and the number of low-value insulator pieces with the threshold value of the number of defective insulator pieces set based on the voltage level of the transmission line, it is possible to determine whether the insulation degree of the insulator string is qualified. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0028] Embodiment 1: A method for detecting zero-value insulators based on the degree of change in electric field strength comprises the following steps: S101, acquiring transmission line data information and insulator string structure data information, constructing a transmission line insulator model and determining the spatial distribution of the electric field strength of the insulator string; The data information of the transmission line and the structure data information of the insulator string are obtained, and the transmission line insulator model is constructed based on the data information of the transmission line and the structure data information of the insulator string, and the spatial distribution of the electric field strength of the insulator string is determined. The data information of the transmission line includes the voltage of the transmission line and the distance between the transmission line, and the structure data information of the insulator string includes the number of insulator pieces, the shape of the insulator, the material of the insulator and the length of the insulator string.

[0029] Acquiring transmission line data information and insulator string structure data information, building a transmission line insulator model and determining the spatial distribution of the electric field strength of the insulator string includes the following steps: Based on the data information of the transmission conductor and the structure data information of the insulator string, a transmission line insulator model is constructed; Based on the transmission line voltage, the number of insulators, the insulator material and the length of the insulator string as the input data of the transmission line insulator model, the electric field intensity distribution of the insulator string is obtained; Based on the voltage floating range of the transmission line and the distance between the transmission lines as the input data of the transmission line insulator model, the superposition variation range of the electric field intensity of the insulator string is obtained; Based on the electric field intensity distribution of the insulator string and the superposition variation range of the electric field intensity of the insulator string, the spatial distribution of the electric field intensity of the insulator string is obtained.

[0030] For example, after completing the construction of the transmission line insulator model, select one of the single-phase transmission lines for electric field strength distribution simulation (without selecting other phase transmission lines at the same time), use the transmission line voltage, number of insulators, insulator material and insulator string length of the single-phase transmission line as the input data of the transmission line insulator model, and obtain the electric field strength distribution of the insulator string of the single-phase transmission line. Select the other two-phase transmission lines (without selecting one of the above-mentioned phase transmission lines at the same time), use the transmission line voltage floating range and the distance between the transmission lines as the input data of the transmission line insulator model, and obtain the superposition variation range of the electric field strength of the insulator string. Finally, based on the distribution of the electric field strength of the insulator string and the superposition variation range of the electric field strength of the insulator string, the spatial distribution of the electric field strength of the insulator string can be obtained. The transmission line insulator model is constructed by using the transmission line data information and the insulator string structure data information to obtain the spatial distribution of the electric field strength of the insulator string. The electric field strength can be measured at a certain distance from the insulator string, which greatly ensures the safety of zero-value insulator detection.

[0031] S102, generating a detection path position based on the spatial distribution of the electric field strength of the insulator string, obtaining the electric field strength signal data information of the insulator string and constructing an electric field strength curve of the insulator string; The transmission conductor data information and the insulator string structure data information are used as the input data of the transmission line insulator model to obtain the spatial distribution of the electric field strength of the insulator string. The detection path position is generated based on the spatial distribution of the electric field strength of the insulator string, and the electric field strength signal data information of the insulator string is obtained based on the time series. The insulator string electric field strength signal data information includes the electric field strength of the first insulator piece, the electric field strength of the second insulator piece, the electric field strength of the third insulator piece...the electric field strength of the Nth insulator piece. The electric field strength signal is processed for the electric field signal information at different positions of the insulator string, and the electric field strength curve of the insulator string is constructed.

[0032] Generating a detection path based on the spatial distribution of the electric field strength of the insulator string, obtaining the electric field strength signal data information of the insulator string and constructing the electric field strength curve of the insulator string includes the following steps: Generate a detection path location plan based on the spatial distribution of the electric field strength of the insulator string and the transmission line insulator model; By selecting one of the detection path position schemes, the electric field strength signal data information at different positions of the insulator string is obtained based on the time series, and the insulator piece marking processing is performed on the insulator string; Based on the electric field strength signal data information at different positions of the insulator string and the insulator piece marking processing results, the electric field strength curve of the insulator string is constructed.

[0033] For example, by generating a detection path location scheme based on the spatial distribution of the electric field strength of the insulator string, the detection path location scheme includes a first detection path location scheme, a second detection path location scheme, a third detection path location scheme...the Nth detection path location scheme. Based on the spatial distribution of the electric field strength of the insulator string and the insulator model of the transmission line, the best detection path location scheme is determined. By selecting the best detection path location scheme, the electric field strength signal data information at different positions of the insulator string is obtained based on the time series, wherein the electric field signal data information at different positions of the insulator string can be pre-processed for abnormal data (for example, missing values ​​are automatically filled to ensure data reliability). Based on the electric field strength signal data information at different positions of the insulator string, the insulator piece marking process is performed on the insulator string, and the electric field strength curve of the insulator string is constructed based on the electric field strength signal data information at different positions of the insulator string and the insulator piece marking process results to obtain the electric field strength curve of the insulator string. Based on the spatial distribution of the electric field strength of the insulator string and the transmission line insulator model, the optimal detection path location scheme is determined to obtain the electric field strength signal data information at different positions of the insulator string, thereby greatly ensuring the accuracy and reliability of zero-value insulator detection.

[0034] S103, based on the insulator string electric field model, the insulator electric field strength curve is subjected to identification and extraction processing of the electric field strength variation characteristics of the insulator segments, and the electric field strength feature extraction processing results of the insulator segments with abnormal and sudden drop in electric field strength and the adjacent insulator segments are obtained; By generating a detection path location plan based on the spatial distribution of the electric field strength of the insulator string, selecting the best detection path location plan to obtain the electric field strength signal data information of the insulator string, and constructing the electric field strength curve of the insulator string, the electric field strength curve of the insulator string is constructed. Based on the electric field strength signal data information of the insulator string without abnormal insulator pieces and the electric field strength signal data information of the insulator string with abnormal insulator pieces, an insulator string electric field model is constructed, and the insulator electric field strength curve is processed based on the insulator string electric field model to identify and extract the characteristics of the insulator piece electric field strength change, and obtain the electric field strength feature extraction processing results of the insulator piece with abnormal sudden drop in electric field strength and its adjacent insulator pieces.

[0035] Building the electric field model of an insulator string includes the following steps: Based on the electric field strength signal data information of the insulator string without abnormal insulator pieces and the electric field strength signal data information of the insulator string with abnormal insulator pieces, an electric field strength curve of the insulator string without abnormal insulator pieces and an electric field strength curve of the insulator string with abnormal insulator pieces are constructed respectively; The electric field strength curve of the insulator string without abnormal insulator segments and the electric field strength curve of the insulator string with abnormal insulator segments are used to train the electric field model of the insulator string; If the model training results are the same as the training sample results, the training is completed; if the model training results are different from the training sample results, the training is repeated.

[0036] Based on the insulator string electric field model, the insulator electric field strength curve is subjected to the identification and extraction processing of the electric field strength variation characteristics of the insulator segments, and the electric field strength feature extraction processing results of the insulator segments with abnormally sudden drop in electric field strength and the adjacent insulator segments are obtained, which includes the following steps: Based on the insulator string electric field model, the insulator electric field strength curve is used to identify the increase characteristics of the insulator electric field strength; Based on the insulator string electric field model, the insulator electric field strength curve is used to identify the electric field strength reduction characteristics of the insulator segment; Based on the feature recognition results of the increase in the electric field strength of the insulator segment and the feature recognition results of the decrease in the electric field strength of the insulator segment, the electric field strength features of the insulator segments adjacent to the insulator segment with the abnormal and sudden drop in electric field strength are extracted and processed to obtain the electric field strength feature extraction and processing results of the insulator segment with the abnormal and sudden drop in electric field strength and its adjacent insulator segments.

[0037] For example, after identifying the feature recognition results of the increase in the electric field strength of the insulator piece and the feature recognition results of the decrease in the electric field strength of the insulator piece, the electric field strength features of the two adjacent insulator pieces on the left and right of the insulator piece where the electric field strength has dropped abnormally can be extracted and processed at the same time (if the electric field strength of the sixth insulator piece drops abnormally, the electric field strength features of the fifth insulator piece, the electric field strength features of the sixth insulator piece, and the electric field strength features of the seventh insulator piece can be extracted and processed at the same time). By extracting and processing the electric field strength features of the two adjacent insulator pieces on the left and right of the insulator piece where the electric field strength has dropped abnormally at the same time, the degree of change in the electric field strength of the insulator piece where the electric field strength has dropped abnormally can be obtained, and the insulation of the insulator piece can be judged according to the degree of change in the electric field strength of the insulator piece, thereby further improving the accuracy of zero-value insulator detection.

[0038] S104, based on the insulator string electric field model, extract the electric field strength feature of the insulator segment with abnormally sudden drop in electric field strength and its adjacent insulator segments, and perform electric field strength change degree determination processing to determine whether it is a zero-value insulator segment or a low-value insulator segment; The electric field strength curve of the insulator is processed by the electric field model of the insulator string to identify and extract the characteristics of the electric field strength change of the insulator piece, and the electric field strength characteristic extraction processing results of the insulator piece with abnormal and sudden drop in electric field strength and its adjacent insulator piece are obtained. The electric field strength change degree determination processing is performed on the electric field strength characteristic extraction processing results of the insulator piece with abnormal and sudden drop in electric field strength and its adjacent insulator piece through the electric field model of the insulator string, and the electric field strength change degree determination processing is obtained. The existence of zero-value insulator pieces and low-value insulator pieces is determined based on the electric field strength change degree determination processing results.

[0039] Based on the insulator string electric field model, the electric field strength feature extraction processing results of the insulator segment with abnormal and sudden drop in electric field strength and its adjacent insulator segments are processed to determine the degree of change of electric field strength to determine whether it is a zero-value insulator segment or a low-value insulator segment, including the following steps: Based on the insulator string electric field model, the electric field strength feature extraction processing results of the insulator segment with abnormal and sudden drop in electric field strength and its adjacent insulator segments are used to calculate the electric field strength change rate; Based on the calculation result of the electric field intensity change rate, a determination process of the degree of change of the electric field intensity is performed; If the result of the electric field strength change degree determination processing is greater than or equal to the electric field strength change degree zero value setting threshold, the insulator segment with abnormal sudden drop in electric field strength is determined to be a zero value insulator segment; If the result of the electric field strength change degree determination processing is less than the electric field strength change degree zero value setting threshold and greater than or equal to the electric field strength change degree low value setting threshold, the insulator segment with abnormally sudden drop in electric field strength is determined to be a low-value insulator segment.

[0040] By judging the processing result according to the degree of change of the electric field strength, it is determined whether the insulator piece with abnormally sudden drop in electric field strength is a zero-value insulator piece or a low-value insulator piece, which greatly improves the detection accuracy of the insulation degree of the insulator piece.

[0041] S105, judging whether the insulation degree of the insulator string is qualified based on the number of zero-value insulator pieces and the number of low-value insulator pieces, and generating an insulation degree report of the insulator string; Based on the insulator string electric field model, the electric field strength feature extraction and processing results of the insulator segment with abnormal and sudden drop in electric field strength and its adjacent insulator segments are processed to determine the degree of change in electric field strength to determine whether the insulator segment with abnormal and sudden drop in electric field strength is a zero-value insulator segment or a low-value insulator segment. Based on the number of zero-value insulator segments and the number of low-value insulator segments, it is determined whether the insulation degree of the insulator string is qualified and an insulator string insulation degree report is generated.

[0042] Based on the number of zero-value insulator pieces and the number of low-value insulator pieces, determining whether the insulation degree of the insulator string is qualified and generating an insulation degree report of the insulator string includes the following steps: If the number of zero-value insulators and the number of low-value insulators are less than the threshold of the number of bad insulators set based on the voltage level of the transmission line, the insulation degree of the insulator string is determined to be qualified, and an insulation degree report of the insulator string is generated; If the number of zero-value insulator pieces and the number of low-value insulator pieces are greater than or equal to the threshold number of bad insulator pieces set based on the voltage level of the transmission line, the insulation level of the insulator string is determined to be unqualified, and an insulator string insulation level report is generated.

[0043] By comparing the number of zero-value insulator pieces and the number of low-value insulator pieces with the threshold value of the number of defective insulator pieces set based on the voltage level of the transmission line, it can be determined whether the insulation degree of the insulator string is qualified.

[0044] The above is a method for detecting zero-value insulators based on the degree of change in electric field strength provided in an embodiment of the present application. The following is a system for detecting zero-value insulators based on the degree of change in electric field strength provided in an embodiment of the present application.

[0045] A zero-value insulator detection system based on the degree of change of electric field strength comprises: A first model building unit is used to build a transmission line insulator model and determine the spatial distribution of the electric field strength of the insulator string based on the transmission line data information and the insulator string structure data information; A first data processing unit is used to generate a detection path position based on the spatial distribution of the electric field strength of the insulator string, obtain the electric field strength signal data information of the insulator string and construct an electric field strength curve of the insulator string; The second model building unit is used to build an insulator string electric field model; The second data processing unit is used to perform identification and extraction processing of the electric field strength variation characteristics of the insulator segments on the insulator electric field strength curve based on the insulator string electric field model, and obtain the electric field strength feature extraction processing results of the insulator segments with abnormal and sudden drop in electric field strength and their adjacent insulator segments; The third data processing unit is used to extract and process the electric field strength characteristics of the insulator segment with abnormal and sudden drop in electric field strength and its adjacent insulator segments based on the insulator string electric field model, and perform electric field strength change degree determination processing to determine whether it is a zero-value insulator segment or a low-value insulator segment; The fourth data processing unit is used to determine whether the insulation degree of the insulator string is qualified based on the number of zero-value insulator pieces and the number of low-value insulator pieces, and generate an insulation degree report of the insulator string.

[0046] The first model building unit is used to build a transmission line insulator model and determine the spatial distribution of the electric field strength of the insulator string based on the transmission line data information and the insulator string structure data information. The transmission line data information includes the transmission line voltage and the distance between the transmission lines, and the insulator string structure data information includes the number of insulator pieces, the insulator shape, the insulator material and the insulator string length.

[0047] The first model building unit builds a transmission line insulator model based on the transmission line data information and the insulator string structure data information and determines the spatial distribution of the electric field strength of the insulator string, including: Based on the data information of the transmission conductor and the structure data information of the insulator string, a transmission line insulator model is constructed; Based on the transmission line voltage, the number of insulators, the insulator material and the length of the insulator string as the input data of the transmission line insulator model, the electric field intensity distribution of the insulator string is obtained; Based on the voltage floating range of the transmission line and the distance between the transmission lines as the input data of the transmission line insulator model, the superposition variation range of the electric field intensity of the insulator string is obtained; Based on the electric field intensity distribution of the insulator string and the superposition variation range of the electric field intensity of the insulator string, the spatial distribution of the electric field intensity of the insulator string is obtained.

[0048] The first data processing unit is used to generate a detection path position based on the spatial distribution of the electric field strength of the insulator string, obtain the electric field strength signal data information of the insulator string and construct the electric field strength curve of the insulator string. The electric field strength signal data information of the insulator string includes the electric field strength of the first insulator piece, the electric field strength of the second insulator piece, the electric field strength of the third insulator piece, and the electric field strength of the Nth insulator piece.

[0049] The first data processing unit generates a detection path position based on the spatial distribution of the electric field strength of the insulator string, obtains the electric field strength signal data information of the insulator string, and constructs the electric field strength curve of the insulator string, including: Generate a detection path location plan based on the spatial distribution of the electric field strength of the insulator string and the transmission line insulator model; By selecting one of the detection path position schemes, the electric field strength signal data information at different positions of the insulator string is obtained based on the time series, and the insulator piece marking processing is performed on the insulator string; Based on the electric field strength signal data information at different positions of the insulator string and the insulator piece marking processing results, the electric field strength curve of the insulator string is constructed.

[0050] The second model building unit is used to build an insulator string electric field model. Building the insulator string electric field model includes: Based on the electric field strength signal data information of the insulator string without abnormal insulator pieces and the electric field strength signal data information of the insulator string with abnormal insulator pieces, an electric field strength curve of the insulator string without abnormal insulator pieces and an electric field strength curve of the insulator string with abnormal insulator pieces are constructed respectively; The electric field strength curve of the insulator string without abnormal insulator segments and the electric field strength curve of the insulator string with abnormal insulator segments are used to train the electric field model of the insulator string; If the model training results are the same as the training sample results, the training is completed; if the model training results are different from the training sample results, the training is repeated.

[0051] The second data processing unit performs identification and extraction processing of the electric field strength variation characteristics of the insulator segments on the insulator electric field strength curve based on the insulator string electric field model, and obtains the electric field strength feature extraction processing results of the insulator segments with abnormally sudden drop in electric field strength and their adjacent insulator segments, including: Based on the insulator string electric field model, the insulator electric field strength curve is used to identify the increase characteristics of the insulator electric field strength; Based on the insulator string electric field model, the insulator electric field strength curve is used to identify the electric field strength reduction characteristics of the insulator segment; Based on the feature recognition results of the increase in the electric field strength of the insulator segment and the feature recognition results of the decrease in the electric field strength of the insulator segment, the electric field strength features of the insulator segments adjacent to the insulator segment with the abnormal and sudden drop in electric field strength are extracted and processed to obtain the electric field strength feature extraction and processing results of the insulator segment with the abnormal and sudden drop in electric field strength and its adjacent insulator segments.

[0052] The third data processing unit extracts and processes the electric field strength characteristics of the insulator segment with abnormally sudden drop in electric field strength and its adjacent insulator segments based on the insulator string electric field model, and performs electric field strength change degree determination processing to determine whether it is a zero-value insulator segment or a low-value insulator segment, including: Based on the insulator string electric field model, the electric field strength feature extraction processing results of the insulator segment with abnormal and sudden drop in electric field strength and its adjacent insulator segments are used to calculate the electric field strength change rate; Based on the calculation result of the electric field intensity change rate, a determination process of the degree of change of the electric field intensity is performed; If the result of the electric field strength change degree determination processing is greater than or equal to the electric field strength change degree zero value setting threshold, the insulator segment with abnormal sudden drop in electric field strength is determined to be a zero value insulator segment; If the result of the electric field strength change degree determination processing is less than the electric field strength change degree zero value setting threshold and greater than or equal to the electric field strength change degree low value setting threshold, the insulator segment with abnormally sudden drop in electric field strength is determined to be a low-value insulator segment.

[0053] The fourth data processing unit determines whether the insulation degree of the insulator string is qualified based on the number of zero-value insulator pieces and the number of low-value insulator pieces, and generates an insulation degree report of the insulator string including: If the number of zero-value insulators and the number of low-value insulators are less than the threshold value of the number of bad insulators set based on the voltage level of the transmission line, the insulation degree of the insulator string is determined to be qualified, and an insulation degree report of the insulator string is generated; If the number of zero-value insulator pieces and the number of low-value insulator pieces are greater than or equal to the threshold number of bad insulator pieces set based on the voltage level of the transmission line, the insulation degree of the insulator string is determined to be unqualified, and an insulator string insulation degree report is generated.

Claims

1. A method for detecting zero-value insulators based on the degree of change in electric field strength, characterized in that: The method comprises: S101, acquiring transmission line data information and insulator string structure data information, constructing a transmission line insulator model and determining the spatial distribution of the electric field strength of the insulator string; S102, generating a detection path position based on the spatial distribution of the electric field strength of the insulator string, obtaining the electric field strength signal data information of the insulator string and constructing an electric field strength curve of the insulator string; S103, based on the insulator string electric field model, the insulator electric field strength curve is subjected to identification and extraction processing of the electric field strength variation characteristics of the insulator segments, and the electric field strength feature extraction processing results of the insulator segments with abnormal and sudden drop in electric field strength and the adjacent insulator segments are obtained; S104, based on the insulator string electric field model, extract the electric field strength feature of the insulator segment with abnormally sudden drop in electric field strength and its adjacent insulator segments, and perform electric field strength change degree determination processing to determine whether it is a zero-value insulator segment or a low-value insulator segment; S105. Based on the number of zero-value insulator pieces and the number of low-value insulator pieces, determine whether the insulation degree of the insulator string is qualified, and generate an insulator string insulation degree report.

2. The method for detecting zero-value insulators based on the degree of change of electric field strength according to claim 1 is characterized in that: The method of obtaining the transmission line data information and the insulator string structure data information, constructing the transmission line insulator model and determining the spatial distribution of the electric field strength of the insulator string comprises the following steps: Based on the data information of the transmission conductor and the structure data information of the insulator string, a transmission line insulator model is constructed; Based on the transmission line voltage, the number of insulators, the insulator material and the length of the insulator string as the input data of the transmission line insulator model, the electric field intensity distribution of the insulator string is obtained; Based on the voltage floating range of the transmission line and the distance between the transmission lines as the input data of the transmission line insulator model, the superposition variation range of the electric field intensity of the insulator string is obtained; Based on the electric field intensity distribution of the insulator string and the superposition variation range of the electric field intensity of the insulator string, the spatial distribution of the electric field intensity of the insulator string is obtained.

3. The method for detecting zero-value insulators based on the degree of change of electric field strength according to claim 1, characterized in that: The method of generating a detection path based on the spatial distribution of the electric field strength of the insulator string, obtaining the electric field strength signal data information of the insulator string and constructing the electric field strength curve of the insulator string comprises the following steps: Generate a detection path location plan based on the spatial distribution of the electric field strength of the insulator string and the transmission line insulator model; By selecting one of the detection path position schemes, the electric field strength signal data information at different positions of the insulator string is obtained based on the time series, and the insulator piece marking processing is performed on the insulator string; Based on the electric field strength signal data information at different positions of the insulator string and the insulator piece marking processing results, the electric field strength curve of the insulator string is constructed.

4. The method for detecting zero-value insulators based on the degree of change of electric field strength according to claim 1, characterized in that: The method of performing identification and extraction processing of electric field strength variation characteristics of insulator segments on the insulator electric field strength curve based on the insulator string electric field model to obtain electric field strength feature extraction processing results of insulator segments with abnormally sudden drop in electric field strength and their adjacent insulator segments comprises the following steps: Based on the insulator string electric field model, the insulator electric field strength curve is used to identify the increase characteristics of the insulator electric field strength; Based on the insulator string electric field model, the insulator electric field strength curve is used to identify the electric field strength reduction characteristics of the insulator segment; Based on the feature recognition results of the increase in the electric field strength of the insulator segment and the feature recognition results of the decrease in the electric field strength of the insulator segment, the electric field strength features of the insulator segments adjacent to the insulator segment with the abnormal and sudden drop in electric field strength are extracted and processed to obtain the electric field strength feature extraction and processing results of the insulator segment with the abnormal and sudden drop in electric field strength and its adjacent insulator segments.

5. The method for detecting zero-value insulators based on the degree of change of electric field strength according to claim 1, characterized in that: The method of extracting the electric field strength characteristics of the insulator segment with abnormally sudden drop in electric field strength and its adjacent insulator segments based on the insulator string electric field model and determining the degree of change of electric field strength to determine whether it is a zero-value insulator segment or a low-value insulator segment comprises the following steps: Based on the insulator string electric field model, the electric field strength feature extraction processing results of the insulator segment with abnormal and sudden drop in electric field strength and its adjacent insulator segments are used to calculate the electric field strength change rate; Based on the calculation result of the electric field intensity change rate, a determination process of the degree of change of the electric field intensity is performed; If the result of the electric field strength change degree determination processing is greater than or equal to the electric field strength change degree zero value setting threshold, the insulator segment with abnormal sudden drop in electric field strength is determined to be a zero value insulator segment; If the result of the electric field strength change degree determination processing is less than the electric field strength change degree zero value setting threshold and greater than or equal to the electric field strength change degree low value setting threshold, the insulator segment with abnormally sudden drop in electric field strength is determined to be a low-value insulator segment.

6. The method for detecting zero-value insulators based on the degree of change of electric field strength according to claim 1, characterized in that: The method of determining whether the insulation degree of the insulator string is qualified based on the number of zero-value insulator pieces and the number of low-value insulator pieces, and generating an insulation degree report of the insulator string comprises the following steps: If the number of zero-value insulators and the number of low-value insulators are less than the threshold value of the number of bad insulators set based on the voltage level of the transmission line, the insulation degree of the insulator string is determined to be qualified, and an insulation degree report of the insulator string is generated; If the number of zero-value insulator pieces and the number of low-value insulator pieces are greater than or equal to the threshold number of bad insulator pieces set based on the voltage level of the transmission line, the insulation degree of the insulator string is determined to be unqualified, and an insulator string insulation degree report is generated.

7. A zero-value insulator detection system based on the degree of change of electric field strength, characterized in that: The system comprises: A first model building unit is used to build a transmission line insulator model and determine the spatial distribution of the electric field strength of the insulator string based on the transmission line data information and the insulator string structure data information; A first data processing unit is used to generate a detection path position based on the spatial distribution of the electric field strength of the insulator string, obtain the electric field strength signal data information of the insulator string and construct an electric field strength curve of the insulator string; The second model building unit is used to build an insulator string electric field model; The second data processing unit is used to perform identification and extraction processing of the electric field strength variation characteristics of the insulator segments on the insulator electric field strength curve based on the insulator string electric field model, and obtain the electric field strength feature extraction processing results of the insulator segments with abnormal and sudden drop in electric field strength and their adjacent insulator segments; The third data processing unit is used to extract and process the electric field strength characteristics of the insulator segment with abnormal and sudden drop in electric field strength and its adjacent insulator segments based on the insulator string electric field model, and perform electric field strength change degree determination processing to determine whether it is a zero-value insulator segment or a low-value insulator segment; The fourth data processing unit is used to determine whether the insulation degree of the insulator string is qualified based on the number of zero-value insulator pieces and the number of low-value insulator pieces, and generate an insulation degree report of the insulator string.

8. The method for detecting zero-value insulators based on the degree of change of electric field strength according to claim 7, characterized in that: The first model building unit builds a transmission line insulator model based on the transmission line data information and the insulator string structure data information and determines the spatial distribution of the electric field strength of the insulator string, including: Based on the data information of the transmission conductor and the structure data information of the insulator string, a transmission line insulator model is constructed; Based on the transmission line voltage, the number of insulators, the insulator material and the length of the insulator string as the input data of the transmission line insulator model, the electric field intensity distribution of the insulator string is obtained; Based on the voltage floating range of the transmission line and the distance between the transmission lines as the input data of the transmission line insulator model, the superposition variation range of the electric field intensity of the insulator string is obtained; Based on the electric field intensity distribution of the insulator string and the superposition variation range of the electric field intensity of the insulator string, the spatial distribution of the electric field intensity of the insulator string is obtained.

9. The method for detecting zero-value insulators based on the degree of change of electric field strength according to claim 7, characterized in that: The second data processing unit performs identification and extraction processing of the electric field strength variation characteristics of the insulator segments on the insulator electric field strength curve based on the insulator string electric field model, and obtains the electric field strength feature extraction processing results of the insulator segments with abnormally sudden drop in electric field strength and their adjacent insulator segments, including: Based on the insulator string electric field model, the insulator electric field strength curve is used to identify the increase characteristics of the insulator electric field strength; Based on the insulator string electric field model, the insulator electric field strength curve is used to identify the electric field strength reduction characteristics of the insulator segment; Based on the feature recognition results of the increase in the electric field strength of the insulator segment and the feature recognition results of the decrease in the electric field strength of the insulator segment, the electric field strength features of the insulator segments adjacent to the insulator segment with the abnormal and sudden drop in electric field strength are extracted and processed to obtain the electric field strength feature extraction and processing results of the insulator segment with the abnormal and sudden drop in electric field strength and its adjacent insulator segments.

10. The method for detecting zero-value insulators based on the degree of change of electric field strength according to claim 7, characterized in that: The third data processing unit extracts the electric field strength feature of the insulator segment with abnormally sudden drop in electric field strength and its adjacent insulator segments based on the insulator string electric field model, and performs electric field strength change degree determination processing to determine whether it is a zero-value insulator segment or a low-value insulator segment, including: Based on the insulator string electric field model, the electric field strength feature extraction processing results of the insulator segment with abnormal and sudden drop in electric field strength and its adjacent insulator segments are used to calculate the electric field strength change rate; Based on the calculation result of the electric field intensity change rate, a determination process of the degree of change of the electric field intensity is performed; If the result of the electric field strength change degree determination processing is greater than or equal to the electric field strength change degree zero value setting threshold, the insulator segment with abnormal sudden drop in electric field strength is determined to be a zero value insulator segment; If the result of the electric field strength change degree determination processing is less than the electric field strength change degree zero value setting threshold and greater than or equal to the electric field strength change degree low value setting threshold, the insulator segment with abnormally sudden drop in electric field strength is determined to be a low-value insulator segment.

Images