A method and system for detecting zero-value insulators based on ultrasonic phased array imaging

Abstract

The application discloses a kind of based on ultrasonic phased array imaging zero value insulator detection method and system, including the following steps: based on ultrasonic phased array to insulator string emits different angle ultrasonic beam, and obtains insulator string ultrasonic beam signal data information generation insulator string image;Based on ultrasonic phased array insulator model to insulator string image carries out insulator string structure contour shape abnormality and insulator string surface abnormality identification processing;To the insulator piece of existence abnormality emits probe focused depth different ultrasonic beam signal, to detect the crack shape in the insulator piece of existence abnormality;Realize by identifying out insulator string structure contour shape abnormality and insulator string surface abnormality situation, to the insulator piece of existence abnormality emits probe focused depth different ultrasonic beam signal, to detect the crack shape in the insulator piece of existence abnormality carries out zero value insulator determination, to greatly improve the efficiency and accuracy of detecting zero value insulator in insulator string.

Description

Technical Field

[0001] This invention belongs to the field of power auxiliary equipment testing technology, and particularly relates to a method and system for detecting zero-value insulators based on ultrasonic phased array imaging. Background Technology

[0002] To ensure the safe and stable operation of transmission lines, it is necessary to measure and inspect the insulation level of insulator strings. Current ultrasonic testing devices emit ultrasonic signals at different angles, requiring the control and adjustment of the ultrasonic probe to achieve the desired emission angle. However, errors inevitably occur during the control and adjustment of the ultrasonic probe's emission angle, leading to inaccurate insulation level detection and resulting in misclassifications of the entire insulator string as low or zero. Furthermore, current ultrasonic testing devices cannot emit ultrasonic beams with different focusing depths, making it impossible to accurately detect crack shapes within insulator discs and thus inaccurately determine the insulation level. Therefore, the current insulator string insulation testing devices cannot guarantee the effectiveness of crack shape detection results and cannot accurately, quickly, and efficiently detect and identify zero-value insulator discs, hindering timely replacement of zero-value insulator discs. This impedes the smooth implementation of UHV line maintenance work and seriously threatens the safe and stable operation of UHV transmission lines. Summary of the Invention

[0003] The technical problem to be solved by this invention is:

[0004] This invention provides a method and system for detecting zero-value insulators based on ultrasonic phased array imaging. By identifying abnormalities in the structural outline and surface of the insulator string, ultrasonic beam signals with different focusing depths are emitted to the insulator pieces with abnormalities to detect the crack patterns within the abnormal insulator pieces and determine the zero-value insulators. This greatly improves the efficiency and accuracy of detecting zero-value insulators in the insulator string.

[0005] Technical solution of the present invention:

[0006] A method for detecting zero-value insulators based on ultrasonic phased array imaging includes the following steps:

[0007] S101. Based on the ultrasonic phased array, ultrasonic beams at different angles are emitted to the insulator string, and the ultrasonic beam signal data information of the insulator string is acquired to generate an image of the insulator string.

[0008] S102. Based on the ultrasonic phased array insulator model, identify and process abnormalities in the structural contour and surface of the insulator string in the insulator string image.

[0009] S103. Based on the identification and processing results of abnormal insulator string structure outline and abnormal surface conditions, ultrasonic beam signals with different detection focusing depths are emitted to insulator pieces with abnormalities in order to detect the crack shape inside the insulator pieces with abnormalities.

[0010] S104. Zero-value insulator determination processing is carried out based on the detection results of abnormal crack shape in the insulator disc;

[0011] S105. Based on the number of zero-value insulator discs and their positions in the insulator string, determine whether the insulation level of the insulator string is qualified, and generate an insulation level report for the insulator string.

[0012] Furthermore, the process of generating an image of the insulator string by emitting ultrasonic beams at different angles to the insulator string using an ultrasonic phased array and acquiring the ultrasonic beam signal data information of the insulator string includes the following steps:

[0013] By changing the time difference between the ultrasonic phased array elements to emit ultrasonic signals, ultrasonic beams at different angles can be emitted onto the insulator string.

[0014] Based on the acquisition of ultrasonic beam signal data of insulators at different angles, delay compensation is performed to enhance the echo signal in the selected direction, so as to obtain the structural outline of the insulator string and the abnormal conditions of the insulator string surface.

[0015] The coordinates of the insulator string's structural outline and surface anomalies are determined, and an image of the insulator string is generated.

[0016] Furthermore, the results of the abnormal identification and processing of the insulator string structure outline shape include insulator string deformation and insulator string tilting, and the results of the abnormal identification and processing of the insulator string surface include dirt on the surface of the insulator discs and cracks on the surface of the insulator discs.

[0017] Furthermore, constructing the ultrasonic phased array insulator model includes the following steps:

[0018] Based on the ultrasonic phased array, ultrasonic beams at different angles are emitted to normal and abnormal insulator strings, and the ultrasonic beam signal data information of the insulator strings is acquired to generate insulator string images for coordinate marking.

[0019] Based on the ultrasonic phased array insulator model, the insulator string images calibrated by coordinates are used to identify and process abnormalities in the structural contour shape and surface of the insulator string.

[0020] Based on the identification and processing results of abnormal insulator string structure contour and abnormal insulator string surface, ultrasonic beam signals with different detection focusing depths are emitted to insulator pieces with abnormalities in order to detect the crack shape inside the insulator pieces with abnormalities.

[0021] Zero-value insulators are determined based on the detection results of abnormal crack shapes in insulator discs.

[0022] Based on the results of the zero-value insulator determination process, the initial model of the ultrasonic phased array insulator is trained.

[0023] If the model training result is the same as the training sample result, the model training is complete; if the model training result is different from the training sample result, the model training is repeated.

[0024] Furthermore, the identification and processing of insulator string structural contour anomalies and surface anomalies based on the ultrasonic phased array insulator model includes the following steps:

[0025] Based on the ultrasonic phased array insulator model, the insulator string image is processed to identify the structural contour anomaly of the insulator string, identify the deformation and tilt of the insulator string, mark the deformed insulator pieces and calculate the degree of tilt of the insulator string.

[0026] Based on the ultrasonic phased array insulator model, the surface anomaly of the insulator string image is identified. The presence of dirt and cracks on the surface of the insulator discs is identified, and the insulator discs with dirt and cracks are marked. The area and thickness of dirt on the surface of the insulator discs and the length of cracks on the surface of the insulator discs are calculated.

[0027] Furthermore, based on the identification and processing results of abnormal insulator string structure contours and surface anomalies, ultrasonic beam signals with different focusing depths are emitted to insulator pieces with anomalies to detect the internal crack shape of the anomaly, including the following steps:

[0028] Based on the identification and processing results of abnormal contours and surface anomalies of insulator strings, ultrasonic beam signals with different detection focusing depths are generated;

[0029] The ultrasonic phased array emits ultrasonic beam signals with different focusing depths to detect abnormal insulator sheets based on the detection of ultrasonic beam signals with different focusing depths.

[0030] Acquire ultrasonic beam signals from insulators at different detection focusing depths, and perform feature identification and extraction of cracks within the insulator sheets;

[0031] Based on the feature recognition and extraction results of cracks within insulator discs, an image of the crack shape within the insulator discs is generated, and the crack path length and crack width are calculated.

[0032] Furthermore, the process of determining zero-value insulators based on the detection results of abnormal crack shapes in insulator discs includes the following steps:

[0033] The insulation level of insulator discs is determined based on the crack shape, crack path length, and crack width within the discs.

[0034] If the insulation degree determination result of the insulator sheet is greater than the zero insulation degree threshold and less than or equal to the low insulation degree threshold, then the insulator with cracks in the sheet is determined to be a low-value insulator.

[0035] If the result of the insulation degree determination of the insulator disc is less than or equal to the zero value threshold set for insulation degree, then the insulator with cracks in the disc is determined to be a zero-value insulator.

[0036] Furthermore, based on the number of zero-value insulator discs and their positions within the insulator string, the insulation level of the insulator string is determined to be qualified, and an insulation level report is generated, including the following steps:

[0037] The insulation level of the insulator string is determined based on the number of zero-value insulator discs and the position of the zero-value insulator in the insulator string.

[0038] If the number of zero-value insulator discs is less than the threshold for the number of zero-value insulator discs set based on the voltage level of the transmission line, and the proportion of the number of zero-value insulators in the high-voltage end region of the insulator string is less than the threshold for the proportion of the high-voltage resistant region set based on the voltage level of the transmission line, then the insulation level of the insulator string is deemed qualified, and an insulation level report for the insulator string is generated.

[0039] If the number of zero-value insulator discs is greater than or equal to the threshold number of zero-value insulator discs set based on the voltage level of the transmission line, and the proportion of zero-value insulators in the high-voltage end region of the insulator string is greater than or equal to the threshold proportion of the high-voltage resistant region region set based on the voltage level of the transmission line, then the insulation level of the insulator string is deemed qualified, and an insulation level report for the insulator string is generated.

[0040] The second aspect of this application provides a zero-value insulator detection system based on ultrasonic phased array imaging, comprising:

[0041] The ultrasonic phased array unit is used to emit ultrasonic beams at different angles to the insulator string and acquire the ultrasonic beam signal data information of the insulator string to generate an image of the insulator string.

[0042] Model building unit, used to build ultrasonic phased array insulator model;

[0043] The first data processing unit is used to identify and process abnormalities in the structural contour and surface of the insulator string based on the ultrasonic phased array insulator model.

[0044] The second data processing unit is used to identify and process abnormalities in the outline shape of the insulator string and abnormalities on the surface of the insulator string, and to emit ultrasonic beam signals with different detection focusing depths to detect the crack shape inside the abnormal insulator sheet.

[0045] The third data processing unit is used to determine zero-value insulators based on the detection results of crack shapes in insulator discs with abnormalities.

[0046] The fourth data processing unit is used to determine whether the insulation level of the insulator string is qualified based on the number of zero-value insulator discs and their positions in the insulator string, and to generate an insulation level report of the insulator string.

[0047] Furthermore, the ultrasonic phased array unit emits ultrasonic beams at different angles to the insulator string and acquires the ultrasonic beam signal data information of the insulator string to generate an image of the insulator string, including:

[0048] By changing the time difference between the ultrasonic phased array elements to emit ultrasonic signals, ultrasonic beams at different angles can be emitted onto the insulator string.

[0049] Based on the acquisition of ultrasonic beam signal data of insulators at different angles, delay compensation is performed to enhance the echo signal in the selected direction, so as to obtain the structural outline of the insulator string and the abnormal conditions of the insulator string surface.

[0050] The coordinates of the insulator string's structural outline and surface anomalies are determined, and an image of the insulator string is generated.

[0051] Furthermore, the first data processing unit performs identification and processing of insulator string images based on the ultrasonic phased array insulator model to identify anomalies in the insulator string structural contour and surface.

[0052] Based on the ultrasonic phased array insulator model, the insulator string image is processed to identify the structural contour anomaly of the insulator string, identify the deformation and tilt of the insulator string, mark the deformed insulator pieces and calculate the degree of tilt of the insulator string.

[0053] Based on the ultrasonic phased array insulator model, the surface anomaly of the insulator string image is identified. The presence of dirt and cracks on the surface of the insulator discs is identified, and the insulator discs with dirt and cracks are marked. The area and thickness of dirt on the surface of the insulator discs and the length of cracks on the surface of the insulator discs are calculated.

[0054] Furthermore, based on the identification and processing results of abnormal insulator string structure contours and surface anomalies, the second data processing unit emits ultrasonic beam signals with different detection focusing depths to the insulator pieces exhibiting anomalies, in order to detect the internal crack shapes of the anomaly-prone insulator pieces, including:

[0055] Based on the identification and processing results of abnormal contours and surface anomalies of insulator strings, ultrasonic beam signals with different detection focusing depths are generated;

[0056] The ultrasonic phased array emits ultrasonic beam signals with different focusing depths to detect abnormal insulator sheets based on the detection of ultrasonic beam signals with different focusing depths.

[0057] Acquire ultrasonic beam signals from insulators at different detection focusing depths, and perform feature identification and extraction of cracks within the insulator sheets;

[0058] Based on the feature recognition and extraction results of cracks within insulator discs, an image of the crack shape within the insulator discs is generated, and the crack path length and crack width are calculated.

[0059] Furthermore, the third data processing unit performs zero-value insulator determination processing based on the detection results of abnormal crack shapes in insulator discs, including:

[0060] The insulation level of insulator discs is determined based on the crack shape, crack path length, and crack width within the discs.

[0061] If the insulation degree determination result of the insulator sheet is greater than the zero insulation degree threshold and less than or equal to the low insulation degree threshold, then the insulator with cracks in the sheet is determined to be a low-value insulator.

[0062] If the result of the insulation degree determination of the insulator disc is less than or equal to the zero value threshold set for insulation degree, then the insulator with cracks in the disc is determined to be a zero-value insulator.

[0063] Furthermore, the fourth data processing unit determines whether the insulation level of the insulator string is qualified based on the number of zero-value insulator discs and their positions in the insulator string, and generates an insulation level report for the insulator string, including the following steps:

[0064] The insulation level of the insulator string is determined based on the number of zero-value insulator discs and the position of the zero-value insulator in the insulator string.

[0065] If the number of zero-value insulator discs is less than the threshold for the number of zero-value insulator discs set based on the voltage level of the transmission line, and the proportion of the number of zero-value insulators in the high-voltage end region of the insulator string is less than the threshold for the proportion of the high-voltage resistant region set based on the voltage level of the transmission line, then the insulation level of the insulator string is deemed qualified, and an insulation level report for the insulator string is generated.

[0066] If the number of zero-value insulator discs is greater than or equal to the threshold number of zero-value insulator discs set based on the voltage level of the transmission line, and the proportion of zero-value insulators in the high-voltage end region of the insulator string is greater than or equal to the threshold proportion of the high-voltage resistant region region set based on the voltage level of the transmission line, then the insulation level of the insulator string is deemed qualified, and an insulation level report for the insulator string is generated.

[0067] The beneficial effects of this invention are:

[0068] This invention enables the identification of zero-value insulators by emitting ultrasonic beams with different focusing depths to detect abnormalities in the structural outline and surface of insulator strings. This allows for the detection of crack patterns within the abnormal insulator sheets and the determination of zero-value insulators, thereby significantly improving the efficiency and accuracy of detecting zero-value insulators in insulator strings.

[0069] This method enables the coordinate calibration of the obtained clear insulator string structural outline and surface anomalies, and generates an insulator string image. The generated insulator string image can facilitate the improvement of the efficiency and accuracy of detecting insulator string anomalies.

[0070] This system enables rapid identification of insulator string anomalies by marking deformed insulator discs and calculating the degree of tilt. This allows for timely repair and replacement of deformed insulator discs and severely tilted insulator strings. Furthermore, by marking insulator discs with surface contamination and cracks, and by analyzing the area and thickness of the contamination on the disc surface and the length of the cracks, the system can quickly and accurately pinpoint the location of anomalies within the insulator string for detection.

[0071] This invention enables the use of ultrasonic phased arrays to emit ultrasonic beam signals with different detection focusing depths to insulator sheets with abnormalities. This allows for the determination of the crack shape within the insulator sheet with abnormality, greatly improving the detection accuracy of cracks in insulator strings. Attached Figure Description

[0072] Figure 1 This is a schematic diagram of the process of this invention. Detailed Implementation

[0073] Example 1:

[0074] A method for detecting zero-value insulators based on ultrasonic phased array imaging includes the following steps:

[0075] S101. Based on the ultrasonic phased array, ultrasonic beams at different angles are emitted to the insulator string, and the ultrasonic beam signal data information of the insulator string is acquired to generate an image of the insulator string.

[0076] An ultrasonic phased array emits ultrasonic beams at different angles onto the insulator string. The ultrasonic phased array, used for both transmitting and receiving ultrasonic beam signals, comprises several array elements. By changing the time difference between the ultrasonic signals emitted by these array elements, the ultrasonic phased array can emit ultrasonic beams at different angles onto the insulator string. (Currently, existing ultrasonic testing devices require controlling and adjusting the moving ultrasonic probe to achieve the desired angle for emitting ultrasonic signals.) Ultrasonic signal data from different angles is acquired based on a time series analysis, and an image of the insulator string is generated.

[0077] The process of generating an image of an insulator string by emitting ultrasonic beams at different angles using an ultrasonic phased array and acquiring the ultrasonic beam signal data includes the following steps:

[0078] By changing the time difference between the ultrasonic phased array elements to emit ultrasonic signals, ultrasonic beams at different angles can be emitted onto the insulator string.

[0079] Based on the acquisition of ultrasonic beam signal data of insulators at different angles, delay compensation is performed to enhance the echo signal in the selected direction, so as to obtain the structural outline of the insulator string and the abnormal conditions of the insulator string surface.

[0080] The coordinates of the insulator string's structural outline and surface anomalies are determined, and an image of the insulator string is generated.

[0081] For example, based on the first time difference of the ultrasonic signals emitted between selected array elements of the ultrasonic phased array, an ultrasonic beam at a first angle is emitted to the insulator string; based on the Nth time difference of the ultrasonic signals emitted between selected array elements, an ultrasonic beam at a Nth angle is emitted to the insulator string. By acquiring ultrasonic signal data of insulators at different angles based on time series, delay compensation is applied to the ultrasonic beam signal data of insulators at different angles to enhance the echo signal in the selected direction, achieving the effect of eliminating the influence of echo signals from other directions. This results in a clear outline of the insulator string structure and surface anomalies, including contamination and cracks in the insulator sheets. By calibrating the obtained clear outline of the insulator string structure and surface anomalies with coordinates, an insulator string image is generated. This generated image facilitates improved efficiency and accuracy in detecting insulator string anomalies.

[0082] S102. Based on the ultrasonic phased array insulator model, identify and process abnormalities in the structural contour and surface of the insulator string in the insulator string image.

[0083] An ultrasonic phased array emits ultrasonic beams at different angles onto an insulator string, acquiring signal data from these beams at various angles. Based on this data, an insulator string image is generated. The image is then processed using an ultrasonic phased array insulator model to identify structural contour anomalies and surface anomalies. The structural contour anomaly identification results include insulator string deformation and tilting, while the surface anomaly identification results include contamination and cracks on the insulator discs.

[0084] The steps involved in constructing an ultrasonic phased array insulator model are as follows:

[0085] Based on the ultrasonic phased array, ultrasonic beams at different angles are emitted to normal and abnormal insulator strings, and the ultrasonic beam signal data information of the insulator strings is acquired to generate insulator string images for coordinate marking.

[0086] Based on the ultrasonic phased array insulator model, the insulator string images calibrated by coordinates are used to identify and process abnormalities in the structural contour shape and surface of the insulator string.

[0087] Based on the identification and processing results of abnormal insulator string structure contour and abnormal insulator string surface, ultrasonic beam signals with different detection focusing depths are emitted to insulator pieces with abnormalities in order to detect the crack shape inside the insulator pieces with abnormalities.

[0088] Zero-value insulators are determined based on the detection results of abnormal crack shapes in insulator discs.

[0089] Based on the results of the zero-value insulator determination process, the initial model of the ultrasonic phased array insulator is trained.

[0090] If the model training result is the same as the training sample result, the model training is complete; if the model training result is different from the training sample result, the model training is repeated.

[0091] The process of identifying and processing abnormalities in the structural contour and surface of insulator strings based on ultrasonic phased array insulator models includes the following steps:

[0092] Based on the ultrasonic phased array insulator model, the insulator string image is processed to identify the structural contour anomaly of the insulator string, identify the deformation and tilt of the insulator string, mark the deformed insulator pieces and calculate the degree of tilt of the insulator string.

[0093] Based on the ultrasonic phased array insulator model, the surface anomaly of the insulator string image is identified. The presence of dirt and cracks on the surface of the insulator discs is identified, and the insulator discs with dirt and cracks are marked. The area and thickness of dirt on the surface of the insulator discs and the length of cracks on the surface of the insulator discs are calculated.

[0094] For example, using an ultrasonic phased array insulator model, abnormalities in the structural outline of an insulator string can be identified in the image. These abnormalities include insulator string deformation and tilting. The position of the deformed insulator disc within the string is marked, and the degree of tilt is calculated. By marking the deformed insulator discs and calculating the tilt, abnormalities in the insulator string can be quickly identified, allowing for timely repair and replacement of deformed insulator discs and severely tilted insulator strings. Furthermore, by using an ultrasonic phased array insulator model to identify surface anomalies in the insulator string image, the presence of contaminants and cracks on the surface of insulator discs can be identified and marked. The area and thickness of the contaminants and the length of the cracks on the insulator discs are calculated. By marking the insulator discs with contaminants and cracks, along with the area, thickness, and length of the contaminants, the location of anomalies in the insulator string can be quickly and accurately pinpointed for detection.

[0095] S103. Based on the identification and processing results of abnormal insulator string structure outline and abnormal surface conditions, ultrasonic beam signals with different detection focusing depths are emitted to insulator pieces with abnormalities in order to detect the crack shape inside the insulator pieces with abnormalities.

[0096] By using an ultrasonic phased array insulator model to identify and process anomalies in the insulator string structure and surface, the results of these anomaly identification processes are obtained. Based on these results, ultrasonic beam signals with different detection focusing depths are generated. The ultrasonic phased array, using these signals, adjusts the focusing delay to emit ultrasonic beam signals with varying depths to detect anomalies in the insulator segments. This enhances the echo signal at cracked areas within the insulator segments, thus enabling more accurate detection of crack shapes.

[0097] Based on the identification and processing results of abnormal insulator string structure contours and surface anomalies, ultrasonic beam signals with different focusing depths are emitted to insulator pieces with anomalies to detect the internal crack shape of the anomaly, including the following steps:

[0098] Based on the identification and processing results of abnormal contours and surface anomalies of insulator strings, ultrasonic beam signals with different detection focusing depths are generated;

[0099] The ultrasonic phased array emits ultrasonic beam signals with different focusing depths to detect abnormal insulator sheets based on the detection of ultrasonic beam signals with different focusing depths.

[0100] Acquire ultrasonic beam signals from insulators at different detection focusing depths, and perform feature identification and extraction of cracks within the insulator sheets;

[0101] Based on the feature recognition and extraction results of cracks within insulator discs, an image of the crack shape within the insulator discs is generated, and the crack path length and crack width are calculated.

[0102] For example, if a crack exists on the surface of the third insulator sheet in an insulator string, ultrasonic beam signals with different focusing depths are generated based on the location of the cracked third insulator sheet. An ultrasonic phased array emits ultrasonic beam signals with different focusing depths to the third insulator sheet, which enhances the echo signal at the cracked area, thus allowing for more accurate detection of the crack shape. The ultrasonic beam signals with different focusing depths are acquired and processed for crack feature extraction, yielding the crack feature extraction result. Based on this result, an image of the crack shape is generated, and the crack path length and crack width are calculated. By using an ultrasonic phased array to emit ultrasonic beam signals with different detection focusing depths to insulator sheets with abnormalities, the shape of cracks inside the insulator sheets with abnormalities can be obtained, which greatly improves the detection accuracy of cracks in insulator strings.

[0103] S104. Zero-value insulator determination processing is carried out based on the detection results of abnormal crack shape in the insulator disc;

[0104] Based on the recognition and processing results of the abnormal contour shape of the insulator string structure and the abnormal conditions on the surface of the insulator string, ultrasonic beam signals with different detection focusing depths are emitted to the insulator discs with abnormalities to detect the crack shape inside the insulator discs with abnormalities. Based on the detection results of the crack shape inside the insulator discs with abnormalities, zero-value insulator determination processing is performed to obtain the zero-value insulator determination processing results.

[0105] Performing zero-value insulator determination processing based on the detection results of the crack shape inside the insulator discs with abnormalities includes the following steps:

[0106] Based on the crack shape, crack path length, and crack width inside the insulator disc, insulator disc insulation degree determination processing is performed;

[0107] If the insulator disc insulation degree determination processing result is greater than the insulation degree zero-value setting threshold and less than or equal to the insulation degree low-value setting threshold, then the insulator with a crack shape inside the disc is determined as a low-value insulator;

[0108] If the insulator disc insulation degree determination processing result is less than or equal to the insulation degree zero-value setting threshold, then the insulator with a crack shape inside the disc is determined as a zero-value insulator.

[0109] For example, based on the proportion of the crack shape area inside the insulator disc, combined with the crack path length and crack width, insulator disc insulation degree determination processing is performed to obtain the insulator disc insulation degree determination processing result, and low-value and zero-value insulator determination is performed through the insulator disc insulation degree determination processing result. Based on the crack shape, crack path length, and crack width inside the insulator disc, low-value and zero-value insulator determination is performed, which greatly improves the accuracy of detecting low-value and zero-value insulators in the insulator string.

[0110] S105. Based on the number of zero-value insulator discs 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;

[0111] Through zero-value insulator determination processing based on the detection results of the crack shape inside the insulator discs with abnormalities, zero-value insulator determination processing is obtained. Based on the number of zero-value insulator discs and the positions of zero-value insulators in the insulator string, determine whether the insulation degree of the insulator string is qualified and generate an insulator string insulation degree report.

[0112] Based on the number of zero-value insulator discs 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:

[0113] Based on the number of zero-value insulator discs and the positions of zero-value insulators in the insulator string, insulator string insulation degree determination processing is performed;

[0114] If the number of zero-value insulator discs is less than the threshold for the number of zero-value insulator discs set based on the voltage level of the transmission line, and the proportion of the number of zero-value insulators in the high-voltage end region of the insulator string is less than the threshold for the proportion of the high-voltage resistant region set based on the voltage level of the transmission line, then the insulation level of the insulator string is deemed qualified, and an insulation level report for the insulator string is generated.

[0115] If the number of zero-value insulator discs is greater than or equal to the threshold number of zero-value insulator discs set based on the voltage level of the transmission line, and the proportion of zero-value insulators in the high-voltage end region of the insulator string is greater than or equal to the threshold proportion of the high-voltage resistant region region set based on the voltage level of the transmission line, then the insulation level of the insulator string is deemed qualified, and an insulation level report for the insulator string is generated.

[0116] By comparing the number of zero-value insulator discs and their positions in the insulator string near the high-voltage end with thresholds for the number of zero-value insulator discs and the proportion of high-voltage resistant areas set based on the voltage level of the transmission line, the accuracy of detecting the insulation level of the insulator string can be greatly improved.

[0117] The above is a method for detecting zero-value insulators based on ultrasonic phased array imaging provided in the embodiments of this application. The following is a system for detecting zero-value insulators based on ultrasonic phased array imaging provided in the embodiments of this application.

[0118] A zero-value insulator detection system based on ultrasonic phased array imaging includes:

[0119] The ultrasonic phased array unit is used to emit ultrasonic beams at different angles to the insulator string and acquire the ultrasonic beam signal data information of the insulator string to generate an image of the insulator string.

[0120] Model building unit, used to build ultrasonic phased array insulator model;

[0121] The first data processing unit is used to identify and process abnormalities in the structural contour and surface of the insulator string based on the ultrasonic phased array insulator model.

[0122] The second data processing unit is used to identify and process abnormalities in the outline shape of the insulator string and abnormalities on the surface of the insulator string, and to emit ultrasonic beam signals with different detection focusing depths to detect the crack shape inside the abnormal insulator sheet.

[0123] The third data processing unit is used to determine zero-value insulators based on the detection results of crack shapes in insulator discs with abnormalities.

[0124] The fourth data processing unit is used to determine whether the insulation level of the insulator string is qualified based on the number of zero-value insulator discs and their positions in the insulator string, and to generate an insulation level report of the insulator string.

[0125] The ultrasonic phased array unit is used to emit ultrasonic beams at different angles onto the insulator string and acquire the ultrasonic beam signal data information of the insulator string to generate an image of the insulator string, including:

[0126] By changing the time difference between the ultrasonic phased array elements to emit ultrasonic signals, ultrasonic beams at different angles can be emitted onto the insulator string.

[0127] Based on the acquisition of ultrasonic beam signal data of insulators at different angles, delay compensation is performed to enhance the echo signal in the selected direction, so as to obtain the structural outline of the insulator string and the abnormal conditions of the insulator string surface.

[0128] The coordinates of the insulator string's structural outline and surface anomalies are determined, and an image of the insulator string is generated.

[0129] The model building unit is used to build an ultrasonic phased array insulator model. Building the ultrasonic phased array insulator model includes:

[0130] Based on the ultrasonic phased array, ultrasonic beams at different angles are emitted to normal and abnormal insulator strings, and the ultrasonic beam signal data information of the insulator strings is acquired to generate insulator string images for coordinate marking.

[0131] Based on the ultrasonic phased array insulator model, the insulator string images calibrated by coordinates are used to identify and process abnormalities in the structural contour shape and surface of the insulator string.

[0132] Based on the identification and processing results of abnormal insulator string structure contour and abnormal insulator string surface, ultrasonic beam signals with different detection focusing depths are emitted to insulator pieces with abnormalities in order to detect the crack shape inside the insulator pieces with abnormalities.

[0133] Zero-value insulators are determined based on the detection results of abnormal crack shapes in insulator discs.

[0134] Based on the results of the zero-value insulator determination process, the initial model of the ultrasonic phased array insulator is trained.

[0135] If the model training result is the same as the training sample result, the model training is complete; if the model training result is different from the training sample result, the model training is repeated.

[0136] The first data processing unit is used to identify and process anomalies in the structural contour and surface of insulator strings based on the ultrasonic phased array insulator model, including:

[0137] Based on the ultrasonic phased array insulator model, the insulator string image is processed to identify the structural contour anomaly of the insulator string, identify the deformation and tilt of the insulator string, mark the deformed insulator pieces and calculate the degree of tilt of the insulator string.

[0138] Based on the ultrasonic phased array insulator model, the surface anomaly of the insulator string image is identified. The presence of dirt and cracks on the surface of the insulator discs is identified, and the insulator discs with dirt and cracks are marked. The area and thickness of dirt on the surface of the insulator discs and the length of cracks on the surface of the insulator discs are calculated.

[0139] The second data processing unit is used to identify and process abnormalities in the insulator string structure outline and surface based on the results of such identification. It then emits ultrasonic beam signals with different focusing depths to detect internal crack shapes in the abnormal insulator pieces, including:

[0140] Based on the identification and processing results of abnormal contours and surface anomalies of insulator strings, ultrasonic beam signals with different detection focusing depths are generated;

[0141] The ultrasonic phased array emits ultrasonic beam signals with different focusing depths to detect abnormal insulator sheets based on the detection of ultrasonic beam signals with different focusing depths.

[0142] Acquire ultrasonic beam signals from insulators at different detection focusing depths, and perform feature identification and extraction of cracks within the insulator sheets;

[0143] Based on the feature recognition and extraction results of cracks within insulator discs, an image of the crack shape within the insulator discs is generated, and the crack path length and crack width are calculated.

[0144] The third data processing unit is used to determine zero-value insulators based on the detection results of crack shapes within abnormal insulator discs, including:

[0145] The insulation level of insulator discs is determined based on the crack shape, crack path length, and crack width within the discs.

[0146] If the insulation degree determination result of the insulator sheet is greater than the zero insulation degree threshold and less than or equal to the low insulation degree threshold, then the insulator with cracks in the sheet is determined to be a low-value insulator.

[0147] If the result of the insulation degree determination of the insulator disc is less than or equal to the zero value threshold set for insulation degree, then the insulator with cracks in the disc is determined to be a zero-value insulator.

[0148] The fourth data processing unit, used to determine whether the insulation level of the insulator string is qualified based on the number of zero-value insulator discs and their positions in the insulator string, and to generate an insulation level report of the insulator string, includes the following steps:

[0149] The insulation level of the insulator string is determined based on the number of zero-value insulator discs and the position of the zero-value insulator in the insulator string.

[0150] If the number of zero-value insulator discs is less than the threshold for the number of zero-value insulator discs set based on the voltage level of the transmission line, and the proportion of the number of zero-value insulators in the high-voltage end region of the insulator string is less than the threshold for the proportion of the high-voltage resistant region set based on the voltage level of the transmission line, then the insulation level of the insulator string is deemed qualified, and an insulation level report for the insulator string is generated.

[0151] If the number of zero-value insulator discs is greater than or equal to the threshold number of zero-value insulator discs set based on the voltage level of the transmission line, and the proportion of zero-value insulators in the high-voltage end region of the insulator string is greater than or equal to the threshold proportion of the high-voltage resistant region region set based on the voltage level of the transmission line, then the insulation level of the insulator string is deemed qualified, and an insulation level report for the insulator string is generated.

Claims

1. A method for detecting zero value insulator based on ultrasonic phased array imaging, characterized in that, The method comprises: S101, transmitting different angle ultrasonic beams to the insulator string based on the ultrasonic phased array, and acquiring insulator string ultrasonic beam signal data information to generate an insulator string image; S102, identifying and processing the insulator string structure contour shape anomaly and the insulator string surface anomaly condition based on the insulator string model of the ultrasonic phased array; S103, based on the identification and processing results of the insulator string structure contour shape anomaly and the insulator string surface anomaly condition, transmitting probe focused ultrasonic beam signals with different depths to the insulator sheet with anomalies to detect the crack shape, crack path length and crack width in the insulator sheet with anomalies; S104, based on the crack shape detection results in the insulator sheet with anomalies, performing zero-value insulator judgment processing; including the following steps: Based on the crack shape, crack path length and crack width in the insulator sheet, perform insulator sheet insulation degree judgment processing; If the insulator sheet insulation degree judgment processing result is greater than the insulation degree zero value setting threshold and less than or equal to the insulation degree low value setting threshold, it is determined that the insulator with crack shape in the sheet is a low value insulator; If the insulator sheet insulation degree judgment processing result is less than or equal to the insulation degree zero value setting threshold, it is determined that the insulator with crack shape in the sheet is a zero value insulator; S105, based on the number of zero value insulator sheets 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, including the following steps: Based on the number of zero value insulator sheets and the position of the zero value insulator in the insulator string, perform insulator string insulation degree judgment processing; If the number of zero value insulator sheets is less than the threshold value of the number of zero value insulator sheets set based on the voltage level of the transmission conductor, and the proportion of the number of zero value insulators in the position of the high voltage end region of the insulator string is less than the proportion threshold value of the high voltage region position set based on the voltage level of the transmission conductor, it is determined that the insulation degree of the insulator string is qualified, and an insulator string insulation degree report is generated; If the number of zero value insulator sheets is greater than or equal to the threshold value of the number of zero value insulator sheets set based on the voltage level of the transmission conductor, and the proportion of the number of zero value insulators in the position of the high voltage end region of the insulator string is greater than or equal to the proportion threshold value of the high voltage region position set based on the voltage level of the transmission conductor, it is determined that the insulation degree of the insulator string is unqualified, and an insulator string insulation degree report is generated.

2. The ultrasonic phased array imaging based method for detecting zero value insulators as claimed in claim 1 wherein, The method comprises: Based on the time difference of transmitting ultrasonic signals between the elements of the ultrasonic phased array, different angle ultrasonic beams are transmitted to the insulator string; Based on the different angle insulator ultrasonic beam signal data information, the echo signal in the selected direction is enhanced by delay compensation to obtain the insulator string structure contour shape and the insulator string surface anomaly condition; Coordinate calibration is performed on the insulator string structure contour shape and the insulator string surface anomaly condition, and an insulator string image is generated.

3. The ultrasonic phased array imaging based method for detecting zero value insulators as claimed in claim 1, wherein, The process of identifying structural contour anomalies and surface anomalies of insulator strings based on ultrasonic phased array insulator models includes the following steps: Based on the ultrasonic phased array insulator model, the insulator string image is processed to identify the structural contour anomaly of the insulator string, identify the deformation and tilt of the insulator string, mark the deformed insulator pieces and calculate the degree of tilt of the insulator string. Based on the ultrasonic phased array insulator model, the insulator string image is processed to identify surface anomalies. The presence of dirt and cracks on the surface of the insulator discs is identified, and the insulator discs with dirt and cracks are marked. The area and thickness of dirt on the surface of the insulator discs and the length of cracks on the surface of the insulator discs are calculated.

4. The ultrasonic phased array imaging based method for detecting zero value insulators as claimed in claim 1, wherein, The process of identifying and processing abnormalities in the insulator string structure outline and surface includes the following steps: emitting ultrasonic beam signals with different focusing depths to detect internal crack shapes in insulator sheets with abnormalities. Based on the identification and processing results of abnormal contours and surface anomalies of insulator strings, ultrasonic beam signals with different detection focusing depths are generated; The ultrasonic phased array is based on the detection of ultrasonic beam signals with different focusing depths, and emits ultrasonic beam signals with different focusing depths to insulator sheets with abnormalities. Acquire ultrasonic beam signals from insulators at different detection focusing depths, and perform feature identification and extraction of cracks within the insulator sheets; Based on the feature recognition and extraction results of cracks within insulator discs, an image of the crack shape within the insulator discs is generated, and the crack path length and crack width are calculated.

5. An ultrasonic phased array imaging based detection system for detecting zero value insulators, characterized in that, include: The ultrasonic phased array unit is used to emit ultrasonic beams at different angles to the insulator string and acquire the ultrasonic beam signal data information of the insulator string to generate an image of the insulator string. Model building unit, used to build ultrasonic phased array insulator model; The first data processing unit is used to identify and process abnormalities in the structural contour and surface of the insulator string based on the ultrasonic phased array insulator model. The second data processing unit is used to identify and process abnormalities in the outline shape and surface of the insulator string based on the results of the identification and processing. It then emits ultrasonic beam signals with different detection focusing depths to detect the crack shape, crack path length and crack width inside the abnormal insulator sheet. The third data processing unit is used to determine zero-value insulators based on the detection results of crack shapes within abnormal insulator discs, including: The insulation level of insulator discs is determined based on the crack shape, crack path length, and crack width within the discs. If the insulation degree determination result of the insulator sheet is greater than the zero insulation degree threshold and less than or equal to the low insulation degree threshold, then the insulator with cracks in the sheet is determined to be a low-value insulator. If the result of the insulation degree determination of the insulator disc is less than or equal to the zero value threshold set for insulation degree, then the insulator with cracks in the disc is determined to be a zero value insulator. The fourth data processing unit is configured to determine whether the insulation level of the insulator string is qualified based on the number of zero-value insulator discs and their positions in the insulator string, and generate an insulator string insulation level report, including: If the number of zero-value insulator discs is less than a threshold value of the number of zero-value insulator discs set based on the voltage level of the transmission conductor, and the proportion of the number of zero-value insulator discs in the region close to the high-voltage end of the insulator string is less than a threshold value of the proportion of the region close to the high-voltage end set based on the voltage level of the transmission conductor, it is determined that the insulation level of the insulator string is qualified, and an insulator string insulation level report is generated. If the number of zero-value insulator discs is greater than or equal to the threshold value of the number of zero-value insulator discs set based on the voltage level of the transmission conductor, and the proportion of the number of zero-value insulator discs in the region close to the high-voltage end of the insulator string is greater than or equal to the threshold value of the proportion of the region close to the high-voltage end set based on the voltage level of the transmission conductor, it is determined that the insulation level of the insulator string is unqualified, and an insulator string insulation level report is generated.

6. The ultrasonic phased array imaging based detection system for zero value insulators of claim 5, wherein, The ultrasonic phased array unit is configured to emit ultrasonic beams of different angles to the insulator string, and obtain insulator string ultrasonic beam signal data information to generate an insulator string image, including: Emitting ultrasonic beams of different angles to the insulator string based on changing the time difference of emitting ultrasonic signals between the ultrasonic phased array elements; Delay compensation is performed based on the obtained insulator ultrasonic beam signal data information of different angles to enhance the echo signal of the selected direction, so as to obtain the structure profile shape of the insulator string and the surface abnormality of the insulator string; Coordinate calibration is performed on the structure profile shape of the insulator string and the surface abnormality of the insulator string, and an insulator string image is generated.

7. The ultrasonic phased array imaging based detection system for zero value insulators of claim 5, wherein, The first data processing unit is configured to perform insulator string structure profile shape abnormality and insulator string surface abnormality identification processing on the insulator string image based on the ultrasonic phased array insulator model, including: Performing insulator string structure profile shape abnormality identification processing on the insulator string image based on the ultrasonic phased array insulator model, identifying insulator string deformation and insulator string tilt, and marking the deformed insulator discs and calculating the tilt degree of the insulator string; Performing insulator string surface abnormality identification processing on the insulator string image based on the ultrasonic phased array insulator model, identifying that there are dirt on the surface of the insulator disc and cracks on the surface of the insulator disc, marking the insulator discs with dirt and cracks on the surface, and calculating the area and thickness of the dirt on the surface of the insulator disc and the length of the cracks on the surface of the insulator disc.

8. The ultrasonic phased array imaging based detection system for zero value insulators of claim 5, wherein, The second data processing unit is configured to emit ultrasonic beam signals of different focusing depths to the abnormal insulator discs based on the results of the insulator string structure profile shape abnormality and insulator string surface abnormality identification processing, to detect the internal crack shape of the abnormal insulator discs, including: Generating ultrasonic beam signals of different focusing depths based on the results of the insulator string structure profile shape abnormality and insulator string surface abnormality identification processing; The ultrasonic phased array emits ultrasonic beam signals of different focusing depths to the abnormal insulator discs based on the ultrasonic beam signals of different focusing depths. Ultrasonic beam signals of insulators with different focusing depths are acquired, and insulator internal crack feature recognition and extraction processing is performed. An insulator internal crack shape image is generated based on the insulator internal crack feature recognition and extraction processing result, and a crack path length and a crack width are calculated.

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