Zero-value insulator detection method and system based on ultrasonic phased array imaging

Abstract

The invention discloses a zero-value insulator detection method and system based on ultrasonic phased array imaging, and the method comprises the following steps: transmitting ultrasonic beams at different angles to an insulator string based on an ultrasonic phased array, and obtaining the signal data information of the ultrasonic beams of the insulator string to generate an insulator string image; based on the ultrasonic phased array insulator model, insulator chain structure contour shape abnormity and insulator chain surface abnormity condition identification processing is carried out on the insulator chain image; transmitting ultrasonic beam signals with different detection focusing depths to the abnormal insulator sheet so as to detect the abnormal internal crack shape of the insulator sheet; according to the invention, by identifying the abnormal condition of the structure contour shape of the insulator chain and the abnormal condition of the surface of the insulator chain, the ultrasonic beam signals with different detection focusing depths are emitted to the abnormal insulator sheet, so that the abnormal inner crack shape of the insulator sheet is detected, and zero-value insulator judgment is carried out; therefore, the efficiency and the accuracy of detecting the zero-value insulator in the insulator string are greatly improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of power auxiliary equipment detection, and in particular relates to a zero-value insulator detection method and system based on ultrasonic phased array imaging. Background Art

[0002] In order to ensure the safe and stable operation of the transmission line, it is necessary to measure and inspect the insulation degree of the insulator string in the transmission line. The current ultrasonic detection device emits ultrasonic signals at different angles, and it is necessary to control and adjust the mobile ultrasonic probe to achieve the required ultrasonic emission angle, and emit ultrasonic signals to the insulator string to detect the insulation degree of the insulator string. Since errors are inevitable in the process of controlling and adjusting the emission angle of the mobile ultrasonic probe, errors in the insulation degree detection of the insulator string are caused, resulting in the insulation detection results of the entire string of insulators being misjudged as low values ​​or zero values. Since the current ultrasonic detection device cannot emit ultrasonic beam signals with different detection focus depths, it is impossible to accurately detect the crack shape in the insulator sheet, etc., resulting in the inability to accurately judge the insulation degree of the insulator. Therefore, the above-mentioned current insulator string insulation detection device cannot guarantee the validity of the crack shape detection and identification results in the insulator sheet, and cannot accurately, quickly and efficiently detect and identify the zero-value insulator sheet in the insulator string, and cannot replace the zero-value insulator sheet in time, which hinders the smooth implementation of the UHV line maintenance work and seriously threatens the safe and stable operation of the UHV transmission line. Summary of the invention

[0003] The technical problems to be solved by the present invention are: The present invention provides a method and system for detecting zero-value insulators based on ultrasonic phased array imaging. By identifying abnormalities in the structural contour shape of an insulator string and abnormalities on the surface of the insulator string, ultrasonic beam signals with different detection focus depths are emitted to the insulator pieces with abnormalities, so as to detect the crack shapes in the insulator pieces with abnormalities and make zero-value insulator judgments, thereby greatly improving the efficiency and accuracy of detecting zero-value insulators in the insulator string.

[0004] Technical solution of the present invention: A method for detecting zero-value insulators based on ultrasonic phased array imaging comprises the following steps: S101, transmitting ultrasonic beams at different angles to an insulator string based on an ultrasonic phased array, and acquiring ultrasonic beam signal data information of the insulator string to generate an insulator string image; S102, identifying and processing the insulator string image for abnormalities in the insulator string structure contour and abnormalities in the insulator string surface based on the ultrasonic phased array insulator model; S103, based on the identification and processing results of the abnormality of the insulator string structure contour and the abnormality of the insulator string surface, emitting ultrasonic beam signals with different detection focus depths to the abnormal insulator pieces, so as to detect the shape of cracks in the abnormal insulator pieces; S104, performing a zero-value insulator determination process based on the abnormal crack shape detection result in the insulator piece; S105. Based on the number of zero-value insulator pieces and their positions in the insulator string, determine whether the insulation degree of the insulator string is qualified, and generate an insulator string insulation degree report.

[0005] Furthermore, emitting ultrasonic beams at different angles to the insulator string based on the ultrasonic phased array and acquiring ultrasonic beam signal data information of the insulator string to generate an insulator string image includes the following steps: Based on changing the time difference of transmitting ultrasonic signals between array elements of the ultrasonic phased array, ultrasonic beams at different angles are transmitted to the insulator string; Based on the acquired insulator ultrasonic beam signal data information at different angles, delay compensation is performed to enhance the echo signal in the selected direction, so as to obtain the structural contour shape of the insulator string and the abnormal conditions on the surface of the insulator string; The structural contour of the insulator string and the surface abnormalities of the insulator string are calibrated, and an insulator string image is generated.

[0006] Furthermore, the results of identifying and processing the abnormality of the insulator string structure contour shape include deformation of the insulator string and inclination of the insulator string, and the results of identifying and processing the abnormality of the insulator string surface include the presence of dirt on the surface of the insulator piece and the presence of cracks on the surface of the insulator piece.

[0007] Furthermore, constructing the ultrasonic phased array insulator model includes the following steps: Based on the ultrasonic phased array, ultrasonic beams of different angles are emitted to normal insulator strings and abnormal insulator strings, and the ultrasonic beam signal data information of the insulator strings is obtained to generate an insulator string image for coordinate marking; Based on the ultrasonic phased array insulator model, the coordinate-calibrated insulator string image is used to identify the abnormalities of the insulator string structure contour and the surface of the insulator string; Based on the recognition and processing results of the abnormality of the insulator string structure contour and the abnormality of the insulator string surface, ultrasonic beam signals with different detection focus depths are emitted to the abnormal insulator pieces to detect the crack shape inside the abnormal insulator pieces; Based on the abnormal crack shape detection results of the insulator piece, the zero-value insulator judgment processing is performed; Based on the result of the zero-value insulator determination, the initial model of the ultrasonic phased array insulator is trained; If the model training results are the same as the training sample results, the model training is completed; if the model training results are different from the training sample results, the model training is repeated.

[0008] Furthermore, based on the ultrasonic phased array insulator model, the insulator string image is processed to identify the abnormality of the insulator string structure contour shape and the abnormality of the insulator string surface, including the following steps: Based on the ultrasonic phased array insulator model, the insulator string image is processed to identify the abnormal shape of the insulator string structure contour, identify the deformation and tilt of the insulator string, mark the deformed insulator pieces, and calculate the tilt degree of the insulator string; Based on the ultrasonic phased array insulator model, the insulator string image is processed to identify abnormal conditions on the surface of the insulator string, identify the presence of dirt and cracks on the surface of the insulator segment, mark the insulator segments with dirt and cracks on the surface, and calculate the area and thickness of the dirt on the surface of the insulator segment and the length of the cracks on the surface of the insulator segment.

[0009] Furthermore, based on the results of identifying and processing the abnormality of the insulator string structure contour and the abnormality of the insulator string surface, emitting ultrasonic beam signals with different detection focus depths to the abnormal insulator pieces to detect the crack shape inside the abnormal insulator pieces includes the following steps: Based on the recognition and processing results of the abnormality of the insulator string structure contour and the abnormality of the insulator string surface, ultrasonic beam signals with different detection focus depths are generated; The ultrasonic phased array transmits ultrasonic beam signals with different detection focus depths to the insulator slices with abnormalities based on ultrasonic beam signals with different detection focus depths; Acquire ultrasonic beam signals of insulators with different detection focus depths, and perform crack feature recognition and extraction processing in insulator sheets; Based on the results of the crack feature recognition and extraction process in the insulator segment, an image of the crack shape in the insulator segment is generated, and the crack path length and crack width are calculated.

[0010] Further, the zero-value insulator determination process based on the abnormal crack shape detection result in the insulator piece includes the following steps: Based on the crack shape, crack path length and crack width in the insulator segment, the insulation degree of the insulator segment is determined; If the result of the insulation determination process of the insulator piece is greater than the insulation zero value setting threshold and less than or equal to the insulation low value setting threshold, the insulator with cracks in the piece is determined to be a low value insulator; If the insulation level determination processing result of the insulator piece is less than or equal to the insulation level zero value setting threshold, the insulator with crack shape in the piece is determined to be a zero value insulator.

[0011] Further, judging whether the insulation degree of the insulator string is qualified based on the number of zero-value insulator pieces and their positions in the insulator string, and generating an insulation degree report of the insulator string includes the following steps: Based on the number of zero-value insulators and the positions of the zero-value insulators in the insulator string, the insulation degree of the insulator string is determined; If the number of zero-value insulators is less than the zero-value insulator number threshold value set based on the voltage level of the transmission line, and the proportion of the number of zero-value insulators in the area close to the high-voltage end of the insulator string is less than the proportion threshold value of the high-voltage area position set based on the voltage level of the transmission line, then the insulation level of the insulator string is determined to be qualified, and an insulation level report of the insulator string is generated; If the number of zero-value insulators is greater than or equal to the zero-value insulator number threshold set based on the voltage level of the transmission line, and the proportion of zero-value insulators in the high-voltage end area of ​​the insulator string is greater than or equal to the high-voltage resistance area position proportion threshold set based on the voltage level of the transmission line, then the insulation level of the insulator string is determined to be qualified, and an insulator string insulation level report is generated.

[0012] The second aspect of the present application provides a zero-value insulator detection system based on ultrasonic phased array imaging, comprising: The ultrasonic phased array unit is used to transmit ultrasonic beams at different angles to the insulator string, and obtain the ultrasonic beam signal data information of the insulator string to generate an insulator string image; A model building unit, used for building an ultrasonic phased array insulator model; The first data processing unit is used to identify and process the insulator string image based on the ultrasonic phased array insulator model to identify the insulator string structure contour shape abnormality and the insulator string surface abnormality; The second data processing unit is used to transmit ultrasonic beam signals with different detection focus depths to the abnormal insulator pieces based on the abnormal insulator string structure contour shape and the abnormal surface condition identification processing results, so as to detect the crack shape in the abnormal insulator piece; A third data processing unit is used to perform zero-value insulator determination processing based on the abnormal crack shape detection result in the insulator piece; 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 their positions in the insulator string, and generate an insulation degree report of the insulator string.

[0013] Furthermore, the ultrasonic phased array unit transmits ultrasonic beams at different angles to the insulator string, and obtains the ultrasonic beam signal data information of the insulator string to generate an insulator string image, including: Based on changing the time difference of transmitting ultrasonic signals between array elements of the ultrasonic phased array, ultrasonic beams at different angles are transmitted to the insulator string; Based on the acquired insulator ultrasonic beam signal data information at different angles, delay compensation is performed to enhance the echo signal in the selected direction, so as to obtain the structural contour shape of the insulator string and the abnormal conditions on the surface of the insulator string; The structural contour of the insulator string and the surface abnormalities of the insulator string are calibrated, and an insulator string image is generated.

[0014] Furthermore, the first data processing unit performs identification processing of the insulator string structure contour abnormality and the insulator string surface abnormality on the insulator string image based on the ultrasonic phased array insulator model, including: Based on the ultrasonic phased array insulator model, the insulator string image is processed to identify the abnormal shape of the insulator string structure contour, identify the deformation and tilt of the insulator string, mark the deformed insulator pieces, and calculate the tilt degree of the insulator string; Based on the ultrasonic phased array insulator model, the insulator string image is processed to identify abnormal conditions on the surface of the insulator string, identify the presence of dirt and cracks on the surface of the insulator segment, mark the insulator segments with dirt and cracks on the surface, and calculate the area and thickness of the dirt on the surface of the insulator segment and the length of the cracks on the surface of the insulator segment.

[0015] Furthermore, the second data processing unit transmits ultrasonic beam signals with different detection focus depths to the abnormal insulator pieces based on the abnormal insulator string structure contour shape and the abnormal insulator string surface condition identification processing results to detect the abnormal insulator piece crack shape, including: Based on the recognition and processing results of the abnormality of the insulator string structure contour and the abnormality of the insulator string surface, ultrasonic beam signals with different detection focus depths are generated; The ultrasonic phased array transmits ultrasonic beam signals with different detection focus depths to the insulator slices with abnormalities based on ultrasonic beam signals with different detection focus depths; Acquire ultrasonic beam signals of insulators with different detection focus depths, and perform crack feature recognition and extraction processing in insulator sheets; Based on the results of the crack feature recognition and extraction process in the insulator segment, an image of the crack shape in the insulator segment is generated, and the crack path length and crack width are calculated.

[0016] Furthermore, the third data processing unit performs zero-value insulator determination processing based on the abnormal crack shape detection result in the insulator piece, including: Based on the crack shape, crack path length and crack width in the insulator segment, the insulation degree of the insulator segment is determined; If the result of the insulation determination process of the insulator piece is greater than the insulation zero value setting threshold and less than or equal to the insulation low value setting threshold, the insulator with cracks in the piece is determined to be a low value insulator; If the insulation level determination processing result of the insulator piece is less than or equal to the insulation level zero value setting threshold, the insulator with crack shape in the piece is determined to be a zero value insulator.

[0017] Furthermore, 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 their positions in the insulator string, and generates an insulation degree report of the insulator string, including the following steps: Based on the number of zero-value insulators and the positions of the zero-value insulators in the insulator string, the insulation degree of the insulator string is determined; If the number of zero-value insulators is less than the zero-value insulator number threshold value set based on the voltage level of the transmission line, and the proportion of the number of zero-value insulators in the area close to the high-voltage end of the insulator string is less than the proportion threshold value of the high-voltage area position set based on the voltage level of the transmission line, then the insulation level of the insulator string is determined to be qualified, and an insulation level report of the insulator string is generated; If the number of zero-value insulators is greater than or equal to the zero-value insulator number threshold set based on the voltage level of the transmission line, and the proportion of zero-value insulators in the high-voltage end area of ​​the insulator string is greater than or equal to the high-voltage resistance area position proportion threshold set based on the voltage level of the transmission line, then the insulation level of the insulator string is determined to be qualified, and an insulator string insulation level report is generated.

[0018] The beneficial effects of the present invention are: It is achieved by identifying the abnormalities in the structural contour shape of the insulator string and the abnormalities on the surface of the insulator string, emitting ultrasonic beam signals with different detection focus depths to the abnormal insulator pieces, so as to detect the crack shapes inside the abnormal insulator pieces and make zero-value insulator judgments, thereby greatly improving the efficiency and accuracy of detecting zero-value insulators in the insulator string.

[0019] The invention realizes coordinate calibration of the obtained clear insulator string structure contour shape and the surface abnormality of the insulator string and generates an insulator string image. The generated insulator string image can improve the efficiency and accuracy of detecting insulator string abnormality.

[0020] By marking the deformed insulator pieces and calculating the tilt of the insulator string, the abnormality of the insulator string can be quickly determined, so that the deformed insulator pieces and the insulator string with serious tilt can be repaired and replaced in time. By marking the insulator pieces with dirt cracks on the surface, the area and thickness of the dirt on the surface of the insulator piece, and the length of the cracks on the surface of the insulator piece, the abnormal position of the insulator string can be quickly and accurately locked for detection.

[0021] By using an ultrasonic phased array to generate ultrasonic beam signals with different detection focus depths, ultrasonic beam signals with different detection focus depths are emitted to abnormal insulator segments, so that the crack shape inside the abnormal insulator segments can be obtained, thereby greatly improving the detection accuracy of cracks in insulator strings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0023] Embodiment 1: A method for detecting zero-value insulators based on ultrasonic phased array imaging comprises the following steps: S101, transmitting ultrasonic beams at different angles to an insulator string based on an ultrasonic phased array, and acquiring ultrasonic beam signal data information of the insulator string to generate an insulator string image; The ultrasonic phased array is used to transmit ultrasonic beams at different angles to the insulator string. The ultrasonic phased array is used to transmit and receive ultrasonic beam signals. The ultrasonic phased array includes a number of ultrasonic phased array elements. The ultrasonic phased array can transmit ultrasonic beams at different angles to the insulator string by changing the time difference of the ultrasonic phased array elements transmitting ultrasonic signals (the existing ultrasonic detection devices currently transmit ultrasonic signals at different angles, and it is necessary to control and adjust the mobile ultrasonic probe to achieve the required angle of ultrasonic transmission). The ultrasonic signal data information of the insulator at different angles is obtained based on the time series and the insulator string image is generated.

[0024] The process of transmitting ultrasonic beams at different angles to an insulator string based on an ultrasonic phased array and obtaining ultrasonic beam signal data information of the insulator string to generate an insulator string image includes the following steps: Based on changing the time difference of transmitting ultrasonic signals between array elements of the ultrasonic phased array, ultrasonic beams at different angles are transmitted to the insulator string; Based on the acquired insulator ultrasonic beam signal data information at different angles, delay compensation is performed to enhance the echo signal in the selected direction, so as to obtain the structural contour shape of the insulator string and the abnormal conditions on the surface of the insulator string; The structural contour of the insulator string and the surface abnormalities of the insulator string are calibrated, and an insulator string image is generated.

[0025] For example, based on the ultrasonic phased array, the first time difference of transmitting ultrasonic signals between array elements is selected to transmit an ultrasonic beam of the first angle to the insulator string; based on the ultrasonic phased array, the Nth time difference of transmitting ultrasonic signals between array elements is selected to transmit an ultrasonic beam of the Nth angle to the insulator string. Based on the time series, the ultrasonic signal data information of the insulator at different angles is obtained, and the delay compensation of the ultrasonic beam signal data information of the insulator at different angles is performed to enhance the echo signal in the selected direction, so as to eliminate the influence of the echo signal in other directions, thereby obtaining a clear insulator string structure contour shape and insulator string surface abnormalities, and the insulator string surface abnormalities include the presence of dirt and cracks in the insulator sheet. By calibrating the coordinates of the obtained clear insulator string structure contour shape and insulator string surface abnormalities, and generating an insulator string image, the generated insulator string image can facilitate the improvement of the efficiency and accuracy of detecting insulator string abnormalities.

[0026] S102, identifying and processing the insulator string image for abnormalities in the insulator string structure contour and abnormalities in the insulator string surface based on the ultrasonic phased array insulator model; The ultrasonic phased array emits ultrasonic beams at different angles to the insulator string, obtains ultrasonic beam signal data information of the insulator string at different angles, generates an insulator string image based on the ultrasonic beam signal data information of the insulator string at different angles, and obtains the insulator string image. The insulator string image is processed by identifying the abnormality of the insulator string structure contour shape and the abnormality of the insulator string surface based on the ultrasonic phased array insulator model, and the insulator string structure contour shape abnormality identification processing results and the insulator string surface abnormality identification processing results are obtained. The insulator string structure contour shape abnormality identification processing results include insulator string deformation and insulator string tilt, and the insulator string surface abnormality identification processing results include the presence of dirt on the surface of the insulator piece and the presence of cracks on the surface of the insulator piece.

[0027] Building the ultrasonic phased array insulator model includes the following steps: Based on the ultrasonic phased array, ultrasonic beams of different angles are emitted to normal insulator strings and abnormal insulator strings, and the ultrasonic beam signal data information of the insulator strings is obtained to generate an insulator string image for coordinate marking; Based on the ultrasonic phased array insulator model, the coordinate-calibrated insulator string image is used to identify the abnormalities of the insulator string structure contour and the surface of the insulator string; Based on the recognition and processing results of the abnormality of the insulator string structure contour and the abnormality of the insulator string surface, ultrasonic beam signals with different detection focus depths are emitted to the abnormal insulator pieces to detect the crack shape inside the abnormal insulator pieces; Based on the abnormal crack shape detection results of the insulator piece, the zero-value insulator judgment processing is performed; Based on the zero-value insulator determination processing result, the initial model of the ultrasonic phased array insulator is trained; If the model training results are the same as the training sample results, the model training is completed; if the model training results are different from the training sample results, the model training is repeated.

[0028] Based on the ultrasonic phased array insulator model, the insulator string image is processed to identify the abnormality of the insulator string structure contour and the abnormality of the insulator string surface, including the following steps: Based on the ultrasonic phased array insulator model, the insulator string image is processed to identify the abnormal shape of the insulator string structure contour, identify the deformation and tilt of the insulator string, mark the deformed insulator pieces, and calculate the tilt degree of the insulator string; Based on the ultrasonic phased array insulator model, the insulator string image is processed to identify abnormal conditions on the surface of the insulator string, identify the presence of dirt and cracks on the surface of the insulator segment, mark the insulator segments with dirt and cracks on the surface, and calculate the area and thickness of the dirt on the surface of the insulator segment and the length of the cracks on the surface of the insulator segment.

[0029] For example, the ultrasonic phased array insulator model is used to identify the presence of abnormal insulator string structure contour in the insulator string image, and the abnormal insulator string structure contour includes insulator string deformation and insulator string tilt. The deformed insulator piece is marked in which piece in the insulator string, and the tilt degree of the insulator string is calculated. By marking the deformed insulator piece and calculating the tilt degree of the insulator string, the abnormality of the insulator string can be quickly determined, so that the deformed insulator piece and the insulator string with serious tilt can be repaired and replaced in time. By performing surface abnormality recognition processing on the insulator string image based on the ultrasonic phased array insulator model, the number of insulator pieces in the insulator string with dirt on the surface and cracks on the surface of the insulator piece is identified and marked, and the area and thickness of the dirt on the surface of the insulator piece and the length of the crack on the surface of the insulator piece are calculated. By marking the insulator piece with dirt and cracks on the surface, the area and thickness of the dirt on the surface of the insulator piece, and the length of the crack on the surface of the insulator piece, the abnormal position of the insulator string can be quickly and accurately locked for detection.

[0030] S103, based on the identification and processing results of the abnormality of the insulator string structure contour and the abnormality of the insulator string surface, emitting ultrasonic beam signals with different detection focus depths to the abnormal insulator pieces, so as to detect the shape of cracks in the abnormal insulator pieces; By performing recognition processing of the insulator string structure contour shape anomalies and surface anomalies on the insulator string image based on the ultrasonic phased array insulator model, the recognition processing results of the insulator string structure contour shape anomalies and surface anomalies are obtained. By generating ultrasonic beam signals with different detection focus depths based on the recognition processing results of the insulator string structure contour shape anomalies and surface anomalies, the ultrasonic phased array changes the focus delay of the ultrasonic phased array to emit ultrasonic beam signals with different detection focus depths for the insulator slices with abnormalities, which can enhance the echo signal at the crack area in the insulator slice, so that the crack shape in the insulator slice can be detected more accurately.

[0031] Based on the results of identifying and processing the abnormality of the insulator string structure contour and the abnormality of the insulator string surface, emitting ultrasonic beam signals with different detection focus depths to the abnormal insulator pieces to detect the crack shape inside the abnormal insulator pieces, the steps include: Based on the recognition and processing results of the abnormality of the insulator string structure contour and the abnormality of the insulator string surface, ultrasonic beam signals with different detection focus depths are generated; The ultrasonic phased array transmits ultrasonic beam signals with different detection focus depths to the insulator slices with abnormalities based on ultrasonic beam signals with different detection focus depths; Acquire ultrasonic beam signals of insulators with different detection focus depths, and perform crack feature recognition and extraction processing in insulator sheets; Based on the results of the crack feature recognition and extraction process in the insulator segment, an image of the crack shape in the insulator segment is generated, and the crack path length and crack width are calculated.

[0032] For example, there is a crack on the surface of the third insulator piece in the insulator string, and an ultrasonic beam signal with different detection focus depths at the location of the third insulator piece region is generated based on the third insulator piece with cracks on the surface. The ultrasonic phased array emits ultrasonic beam signals with different detection focus depths to the third insulator piece based on the ultrasonic beam signals with different detection focus depths at the location of the third insulator piece region, which can enhance the echo signal at the crack area in the third insulator piece, so that the shape of the crack in the third insulator piece can be detected more accurately. The ultrasonic beam signal of the third insulator piece with different detection focus depths is obtained, and the feature recognition and extraction processing of the crack in the third insulator piece is performed to obtain the feature recognition and extraction processing result of the crack in the third insulator piece. Based on the feature recognition and extraction processing result of the crack in the third insulator piece, an image of the shape of the crack in the third insulator piece is generated, and the path length and crack width of the crack in the third insulator piece are calculated. By using the ultrasonic phased array to generate ultrasonic beam signals with different detection focal depths, ultrasonic beam signals with different detection focal depths are emitted to the abnormal insulator segments, so that the crack shape inside the abnormal insulator segments can be obtained, thereby greatly improving the detection accuracy of cracks in the insulator string.

[0033] S104, performing a zero-value insulator determination process based on the abnormal crack shape detection result in the insulator piece; Based on the abnormality of the insulator string structure contour shape and the abnormality of the insulator string surface, ultrasonic beam signals with different detection focus depths are emitted to the abnormal insulator piece to detect the crack shape inside the abnormal insulator piece. Based on the detection result of the crack shape inside the abnormal insulator piece, a zero-value insulator determination processing is performed to obtain a zero-value insulator determination processing result.

[0034] The zero-value insulator determination process based on the abnormal crack shape detection result in the insulator piece includes the following steps: Based on the crack shape, crack path length and crack width in the insulator segment, the insulation degree of the insulator segment is determined; If the result of the insulation determination process of the insulator piece is greater than the insulation zero value setting threshold and less than or equal to the insulation low value setting threshold, the insulator with cracks in the piece is determined to be a low value insulator; If the insulation level determination processing result of the insulator piece is less than or equal to the insulation level zero value setting threshold, the insulator with crack shape in the piece is determined to be a zero value insulator.

[0035] For example, the insulation degree of the insulator piece is determined based on the proportion of the crack shape in the insulator piece in its area, combined with the crack path length and crack width, to obtain the insulation degree determination result of the insulator piece, and the low-value and zero-value insulators are determined based on the insulation degree determination result of the insulator piece. By determining the low-value and zero-value insulators based on the crack shape, crack path length and crack width in the insulator piece, the accuracy of detecting low-value and zero-value insulators in the insulator string is greatly improved.

[0036] S105, judging whether the insulation degree of the insulator string is qualified based on the number of zero-value insulator pieces and their positions in the insulator string, and generating an insulation degree report of the insulator string; By performing zero-value insulator determination processing based on the crack shape detection results in the insulator pieces with abnormalities, the zero-value insulator determination processing is obtained. Based on the number of zero-value insulator pieces and the position of the zero-value insulators in the insulator string, it is determined whether the insulation degree of the insulator string is qualified, and an insulator string insulation degree report is generated.

[0037] Based on the number of zero-value insulator pieces and their positions in the insulator string, determining whether the insulation degree of the insulator string is qualified and generating an insulator string insulation degree report includes the following steps: Based on the number of zero-value insulators and the positions of the zero-value insulators in the insulator string, the insulation degree of the insulator string is determined; If the number of zero-value insulators is less than the zero-value insulator number threshold value set based on the voltage level of the transmission line, and the proportion of the number of zero-value insulators in the area close to the high-voltage end of the insulator string is less than the proportion threshold value of the high-voltage area position set based on the voltage level of the transmission line, then the insulation level of the insulator string is determined to be qualified, and an insulation level report of the insulator string is generated; If the number of zero-value insulators is greater than or equal to the zero-value insulator number threshold set based on the voltage level of the transmission line, and the proportion of zero-value insulators in the high-voltage end area of ​​the insulator string is greater than or equal to the high-voltage resistance area position proportion threshold set based on the voltage level of the transmission line, then the insulation level of the insulator string is determined to be qualified, and an insulator string insulation level report is generated.

[0038] By comparing the number of zero-value insulators and their positions in the high-voltage end area of ​​the insulator string with the threshold of the number of zero-value insulators and the threshold of the proportion of high-voltage resistant area positions set based on the voltage level of the transmission line, the accuracy of detecting the insulation degree of the insulator string can be greatly improved.

[0039] The above is a zero-value insulator detection method based on ultrasonic phased array imaging provided in an embodiment of the present application, and the following is a zero-value insulator detection system based on ultrasonic phased array imaging provided in an embodiment of the present application.

[0040] A zero-value insulator detection system based on ultrasonic phased array imaging, comprising: The ultrasonic phased array unit is used to transmit ultrasonic beams at different angles to the insulator string, and obtain the ultrasonic beam signal data information of the insulator string to generate an insulator string image; A model building unit, used for building an ultrasonic phased array insulator model; The first data processing unit is used to identify and process the insulator string image based on the ultrasonic phased array insulator model to identify the insulator string structure contour shape abnormality and the insulator string surface abnormality; The second data processing unit is used to transmit ultrasonic beam signals with different detection focus depths to the abnormal insulator pieces based on the abnormal insulator string structure contour shape and the abnormal surface condition identification processing results, so as to detect the crack shape in the abnormal insulator piece; A third data processing unit is used to perform zero-value insulator determination processing based on the abnormal crack shape detection result in the insulator piece; 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 their positions in the insulator string, and generate an insulation degree report of the insulator string.

[0041] The ultrasonic phased array unit is used to transmit ultrasonic beams at different angles to the insulator string, and obtain the ultrasonic beam signal data information of the insulator string to generate an insulator string image, including: Based on changing the time difference of transmitting ultrasonic signals between array elements of the ultrasonic phased array, ultrasonic beams at different angles are transmitted to the insulator string; Based on the acquired insulator ultrasonic beam signal data information at different angles, delay compensation is performed to enhance the echo signal in the selected direction, so as to obtain the structural contour shape of the insulator string and the abnormal conditions on the surface of the insulator string; The structural contour of the insulator string and the surface abnormalities of the insulator string are calibrated, and an insulator string image is generated.

[0042] The model building unit is used to build an ultrasonic phased array insulator model. The ultrasonic phased array insulator model includes: Based on the ultrasonic phased array, ultrasonic beams of different angles are emitted to normal insulator strings and abnormal insulator strings, and the ultrasonic beam signal data information of the insulator strings is obtained to generate an insulator string image for coordinate marking; Based on the ultrasonic phased array insulator model, the coordinate-calibrated insulator string image is used to identify the abnormalities of the insulator string structure contour and the surface of the insulator string; Based on the recognition and processing results of the abnormality of the insulator string structure contour and the abnormality of the insulator string surface, ultrasonic beam signals with different detection focus depths are emitted to the abnormal insulator pieces to detect the crack shape inside the abnormal insulator pieces; Based on the abnormal crack shape detection results of the insulator piece, the zero-value insulator judgment processing is performed; Based on the zero-value insulator determination processing result, the initial model of the ultrasonic phased array insulator is trained; If the model training results are the same as the training sample results, the model training is completed; if the model training results are different from the training sample results, the model training is repeated.

[0043] The first data processing unit is used to identify and process the insulator string image based on the ultrasonic phased array insulator model to identify the insulator string structure contour shape abnormality and the insulator string surface abnormality, including: Based on the ultrasonic phased array insulator model, the insulator string image is processed to identify the abnormal shape of the insulator string structure contour, identify the deformation and tilt of the insulator string, mark the deformed insulator pieces, and calculate the tilt degree of the insulator string; Based on the ultrasonic phased array insulator model, the insulator string image is processed to identify abnormal conditions on the surface of the insulator string, identify the presence of dirt and cracks on the surface of the insulator segment, mark the insulator segments with dirt and cracks on the surface, and calculate the area and thickness of the dirt on the surface of the insulator segment and the length of the cracks on the surface of the insulator segment.

[0044] The second data processing unit is used to transmit ultrasonic beam signals with different detection focus depths to the abnormal insulator pieces based on the abnormal insulator string structure contour shape and the abnormal insulator string surface condition identification processing results to detect the abnormal insulator piece crack shape, including: Based on the recognition and processing results of the abnormality of the insulator string structure contour and the abnormality of the insulator string surface, ultrasonic beam signals with different detection focus depths are generated; The ultrasonic phased array transmits ultrasonic beam signals with different detection focus depths to the insulator slices with abnormalities based on ultrasonic beam signals with different detection focus depths; Acquire ultrasonic beam signals of insulators with different detection focus depths, and perform crack feature recognition and extraction processing in insulator sheets; Based on the results of the crack feature recognition and extraction process in the insulator segment, an image of the crack shape in the insulator segment is generated, and the crack path length and crack width are calculated.

[0045] The third data processing unit, which is used to perform zero-value insulator determination processing based on the abnormal crack shape detection result in the insulator piece, includes: Based on the crack shape, crack path length and crack width in the insulator segment, the insulation degree of the insulator segment is determined; If the result of the insulation determination process of the insulator piece is greater than the insulation zero value setting threshold and less than or equal to the insulation low value setting threshold, the insulator with cracks in the piece is determined to be a low value insulator; If the insulation level determination processing result of the insulator piece is less than or equal to the insulation level zero value setting threshold, the insulator with crack shape in the piece is determined to be a zero value insulator.

[0046] 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 their positions in the insulator string, and generate an insulation degree report of the insulator string, including the following steps: Based on the number of zero-value insulators and the positions of the zero-value insulators in the insulator string, the insulation degree of the insulator string is determined; If the number of zero-value insulators is less than the zero-value insulator number threshold value set based on the voltage level of the transmission line, and the proportion of the number of zero-value insulators in the area close to the high-voltage end of the insulator string is less than the proportion threshold value of the high-voltage area position set based on the voltage level of the transmission line, then the insulation level of the insulator string is determined to be qualified, and an insulation level report of the insulator string is generated; If the number of zero-value insulators is greater than or equal to the zero-value insulator number threshold set based on the voltage level of the transmission line, and the proportion of zero-value insulators in the high-voltage end area of ​​the insulator string is greater than or equal to the high-voltage resistance area position proportion threshold set based on the voltage level of the transmission line, then the insulation level of the insulator string is determined to be qualified, and an insulator string insulation level report is generated.

Claims

1. A method for detecting zero-value insulators based on ultrasonic phased array imaging, characterized in that: The method comprises: S101, transmitting ultrasonic beams at different angles to an insulator string based on an ultrasonic phased array, and acquiring ultrasonic beam signal data information of the insulator string to generate an insulator string image; S102, identifying and processing the insulator string image for abnormalities in the insulator string structure contour and abnormalities in the insulator string surface based on the ultrasonic phased array insulator model; S103, based on the identification and processing results of the abnormality of the insulator string structure contour and the abnormality of the insulator string surface, emitting ultrasonic beam signals with different detection focus depths to the abnormal insulator pieces, so as to detect the shape of cracks in the abnormal insulator pieces; S104, performing a zero-value insulator determination process based on the abnormal crack shape detection result in the insulator piece; S105. Based on the number of zero-value insulator pieces and their positions in the insulator string, 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 ultrasonic phased array imaging according to claim 1 is characterized in that: The method of transmitting ultrasonic beams at different angles to the insulator string based on the ultrasonic phased array and acquiring ultrasonic beam signal data information of the insulator string to generate an insulator string image comprises the following steps: Based on changing the time difference of transmitting ultrasonic signals between array elements of the ultrasonic phased array, ultrasonic beams at different angles are transmitted to the insulator string; Based on the acquired insulator ultrasonic beam signal data information at different angles, delay compensation is performed to enhance the echo signal in the selected direction, so as to obtain the structural contour shape of the insulator string and the abnormal conditions on the surface of the insulator string; The structural contour of the insulator string and the surface abnormalities of the insulator string are calibrated, and an insulator string image is generated.

3. The method for detecting zero-value insulators based on ultrasonic phased array imaging according to claim 1 is characterized in that: The method of performing identification processing of the insulator string image based on the ultrasonic phased array insulator model on the insulator string structure contour abnormality and the insulator string surface abnormality includes the following steps: Based on the ultrasonic phased array insulator model, the insulator string image is processed to identify the abnormal shape of the insulator string structure contour, identify the deformation and tilt of the insulator string, mark the deformed insulator pieces, and calculate the tilt degree of the insulator string; Based on the ultrasonic phased array insulator model, the insulator string image is processed to identify abnormal conditions on the surface of the insulator string, identify the presence of dirt and cracks on the surface of the insulator segment, mark the insulator segments with dirt and cracks on the surface, and calculate the area and thickness of the dirt on the surface of the insulator segment and the length of the cracks on the surface of the insulator segment.

4. The method for detecting zero-value insulators based on ultrasonic phased array imaging according to claim 1, characterized in that: The method of transmitting ultrasonic beam signals with different detection focus depths to the abnormal insulator pieces based on the abnormal insulator string structure contour shape and the abnormal insulator string surface condition identification processing results to detect the abnormal insulator piece crack shape includes the following steps: Based on the recognition and processing results of the abnormality of the insulator string structure contour and the abnormality of the insulator string surface, ultrasonic beam signals with different detection focus depths are generated; The ultrasonic phased array transmits ultrasonic beam signals with different detection focus depths to the insulator slices with abnormalities based on ultrasonic beam signals with different detection focus depths; Acquire ultrasonic beam signals of insulators with different detection focus depths, and perform crack feature recognition and extraction processing in insulator sheets; Based on the results of the crack feature recognition and extraction process in the insulator segment, an image of the crack shape in the insulator segment is generated, and the crack path length and crack width are calculated.

5. The method for detecting zero-value insulators based on ultrasonic phased array imaging according to claim 1, characterized in that: The zero-value insulator determination process based on the abnormal crack shape detection result in the insulator piece comprises the following steps: Based on the crack shape, crack path length and crack width in the insulator segment, the insulation degree of the insulator segment is determined; If the result of the insulation determination process of the insulator piece is greater than the insulation zero value setting threshold and less than or equal to the insulation low value setting threshold, the insulator with cracks in the piece is determined to be a low value insulator; If the insulation level determination processing result of the insulator piece is less than or equal to the insulation level zero value setting threshold, the insulator with crack shape in the piece is determined to be a zero value insulator.

6. The method for detecting zero-value insulators based on ultrasonic phased array imaging 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 their positions in the insulator string, and generating an insulation degree report of the insulator string comprises the following steps: Based on the number of zero-value insulators and the positions of the zero-value insulators in the insulator string, the insulation degree of the insulator string is determined; If the number of zero-value insulators is less than the zero-value insulator number threshold value set based on the voltage level of the transmission line, and the proportion of the number of zero-value insulators in the area close to the high-voltage end of the insulator string is less than the proportion threshold value of the high-voltage area position set based on the voltage level of the transmission line, then the insulation level of the insulator string is determined to be qualified, and an insulation level report of the insulator string is generated; If the number of zero-value insulators is greater than or equal to the zero-value insulator number threshold set based on the voltage level of the transmission line, and the proportion of zero-value insulators in the high-voltage end area of ​​the insulator string is greater than or equal to the high-voltage resistance area position proportion threshold set based on the voltage level of the transmission line, then the insulation level of the insulator string is determined to be qualified, and an insulator string insulation level report is generated.

7. A zero-value insulator detection system based on ultrasonic phased array imaging, characterized in that: include: The ultrasonic phased array unit is used to transmit ultrasonic beams at different angles to the insulator string, and obtain the ultrasonic beam signal data information of the insulator string to generate an insulator string image; A model building unit, used for building an ultrasonic phased array insulator model; The first data processing unit is used to identify and process the insulator string image based on the ultrasonic phased array insulator model to identify the insulator string structure contour shape abnormality and the insulator string surface abnormality; The second data processing unit is used to transmit ultrasonic beam signals with different detection focus depths to the abnormal insulator pieces based on the abnormal insulator string structure contour shape and the abnormal surface condition identification processing results, so as to detect the crack shape in the abnormal insulator piece; A third data processing unit is used to perform zero-value insulator determination processing based on the abnormal crack shape detection result in the insulator piece; 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 their positions in the insulator string, and generate an insulation degree report of the insulator string.

8. The zero-value insulator detection system based on ultrasonic phased array imaging according to claim 7 is characterized in that: The ultrasonic phased array unit transmits ultrasonic beams at different angles to the insulator string, and obtains ultrasonic beam signal data information of the insulator string to generate an insulator string image, including: Based on changing the time difference of transmitting ultrasonic signals between array elements of the ultrasonic phased array, ultrasonic beams at different angles are transmitted to the insulator string; Based on the acquired insulator ultrasonic beam signal data information at different angles, delay compensation is performed to enhance the echo signal in the selected direction, so as to obtain the structural contour shape of the insulator string and the abnormal conditions on the surface of the insulator string; The structural contour of the insulator string and the surface abnormalities of the insulator string are calibrated, and an insulator string image is generated.

9. The zero-value insulator detection system based on ultrasonic phased array imaging according to claim 7 is characterized in that: The first data processing unit performs identification processing of the insulator string structure contour abnormality and the insulator string surface abnormality on the insulator string image based on the ultrasonic phased array insulator model, including: Based on the ultrasonic phased array insulator model, the insulator string image is processed to identify the abnormal shape of the insulator string structure contour, identify the deformation and tilt of the insulator string, mark the deformed insulator pieces, and calculate the tilt degree of the insulator string; Based on the ultrasonic phased array insulator model, the insulator string image is processed to identify abnormal conditions on the surface of the insulator string, identify the presence of dirt and cracks on the surface of the insulator segment, mark the insulator segments with dirt and cracks on the surface, and calculate the area and thickness of the dirt on the surface of the insulator segment and the length of the cracks on the surface of the insulator segment.

10. The zero-value insulator detection system based on ultrasonic phased array imaging according to claim 7, characterized in that: The second data processing unit transmits ultrasonic beam signals with different detection focus depths to the abnormal insulator pieces based on the abnormal insulator string structure contour shape and the abnormal insulator string surface condition identification processing results to detect the abnormal insulator piece crack shape, including: Based on the recognition and processing results of the abnormality of the insulator string structure contour and the abnormality of the insulator string surface, ultrasonic beam signals with different detection focus depths are generated; The ultrasonic phased array transmits ultrasonic beam signals with different detection focus depths to the insulator slices with abnormalities based on ultrasonic beam signals with different detection focus depths; Acquire ultrasonic beam signals of insulators with different detection focus depths, and perform crack feature recognition and extraction processing in insulator sheets; Based on the results of the crack feature recognition and extraction process in the insulator segment, an image of the crack shape in the insulator segment is generated, and the crack path length and crack width are calculated.

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