A corona detection ultraviolet imager

Abstract

The application discloses a corona detection ultraviolet imager and relates to the technical field of ultraviolet imaging, which comprises an image processing module, a controller, a visible light image acquisition module, an ultraviolet image acquisition module, a thermal infrared image acquisition module and an image display module. The position of corona discharge is determined through ultraviolet imaging, so that the discharge target in the discharge area can be determined in the visible light image, and the target range where the discharge target is located can be determined, so that the identification range of the abnormal heating area in the thermal infrared image is limited to the target range, so that the disordered thermal infrared parameters outside the target range in the finally presented three-light fusion image are effectively screened out, and the user can more quickly combine the abnormal heating area to judge the fault from the target range corresponding to the corona discharge position, which is more beneficial to the judgment of the user on the fault.

Description

Technical Field

[0001] This invention relates to the field of ultraviolet imaging technology, and more particularly to an ultraviolet imager for corona detection. Background Technology

[0002] Currently, ultraviolet (UV) imaging technology is widely used in the detection of corona discharge in power grids. Corona discharge is a localized discharge phenomenon that occurs when the local voltage stress of a charged body exceeds a critical value, causing air ionization and resulting in corona discharge. During the discharge process, electrons in the air continuously gain and release energy. When electrons release energy (i.e., discharge), they emit ultraviolet light. UV imaging technology locates the corona discharge by capturing this ultraviolet light. UV imaging technology uses an optical system to separate visible and ultraviolet light. A background image is obtained through the visible light channel, while the ultraviolet detector detects the ultraviolet photons generated during the corona discharge and converts them into electrical signals. These electrical signals are then processed and converted into an optical image visible to the human eye, ultimately generating a visible-ultraviolet combined image on a display. This combined image clearly shows the location and intensity of the corona discharge.

[0003] Because corona discharge in the power grid is sometimes accompanied by heat generation, in order to obtain more fault parameters and quickly determine the cause of the fault by combining the location of the heat source and the location of the corona discharge, the three-light fusion imaging technology that combines visible light imaging technology, ultraviolet imaging technology and infrared thermal imaging technology has been gradually promoted and continuously developed. For example, the "real-time analysis and fusion system of ultraviolet light, infrared light and visible light three-spectrum imaging" proposed in Chinese invention application with publication number CN115790846A.

[0004] However, since the fused image contains not only visible light images but also thermal infrared images of many heating locations and ultraviolet images of many corona discharge locations, there is a lot of invalid data in the fused image, which can easily affect the user's judgment of the cause of the fault. Summary of the Invention

[0005] To overcome the shortcomings mentioned above, the present invention aims to provide a solution that can solve the aforementioned technical problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a corona detection ultraviolet imager, comprising an image processing module, a controller, a visible light image acquisition module, an ultraviolet image acquisition module, a thermal infrared image acquisition module, and an image display module; the visible light image acquisition module is used to acquire a visible light image of the observation area, the ultraviolet image acquisition module is used to acquire an ultraviolet image of the observation area, and the thermal infrared image acquisition module is used to acquire a thermal infrared image of the observation area; the controller performs edge detection on the corona spot in the ultraviolet image through the image processing module to obtain a corona discharge region containing edge point coordinate information, and obtains an ultraviolet spot image of the corresponding corona discharge region through threshold segmentation; the discharge target involving the corona discharge region is extracted from the visible light image, and edge detection is performed on the discharge target to obtain a target range containing edge point coordinate information; thermal infrared parameters are read from the target range where the discharge target is located in the thermal infrared image to determine the abnormal heating region within the target range, and obtains a thermal infrared image of the corresponding abnormal heating region through threshold segmentation; the visible light image, the ultraviolet spot image, and the thermal infrared image of the abnormal heating region are fused to form a three-light fusion image; the controller outputs and displays the three-light fusion image through the image display module.

[0007] As a further aspect of the present invention: when the corona discharge region and the abnormal heating region overlap, an alarm is displayed in the fused image at the overlapping area.

[0008] As a further aspect of the present invention: the alarm display method is to make the display brightness of the corresponding overlapping area in the fused image different from the brightness of the corresponding area in the visible light image, different from the brightness of the corresponding area in the ultraviolet image, and different from the brightness of the corresponding area in the thermal infrared image.

[0009] As a further aspect of the present invention: the alarm display method is to make the display color of the corresponding overlapping area in the fused image different from the color of the corresponding area in the visible light image, different from the color of the corresponding area in the ultraviolet image, and different from the color of the corresponding area in the thermal infrared image.

[0010] As a further aspect of the present invention: temperature value information corresponding to the abnormal heating area is generated in the three-light fusion image.

[0011] As a further aspect of the present invention, it also includes infrared ranging of the abnormally heated area in the thermal infrared image to generate distance value information.

[0012] As a further aspect of the present invention: the distance value information is the distance to the farthest point of the abnormal heating area and / or the distance to the nearest point of the abnormal heating area and / or the distance based on the center point of the abnormal heating area.

[0013] As a further aspect of the present invention, the method for determining the center point of the abnormal heating area is to perform geometric feature analysis on the abnormal heating area to obtain the center position of the abnormal heating area.

[0014] As a further aspect of the present invention: the contour information of the discharge target is obtained from the visible light image, and the features of the discharge target are calculated; the obtained discharge target features are compared with the target features in the typical power grid equipment database to determine the structural component type of the extracted discharge target; after determining the type of discharge target, the size of the structural component of that type in the typical power grid equipment database is obtained; the simulated full-view contour of the discharge target is determined based on the obtained contour information to obtain the simulated full-view area of ​​the discharge target.

[0015] As a further aspect of the present invention: the target range includes the visible area range of the discharge target defined by the visible contour obtained in the visible light image of the discharge target, and the simulated area range of the discharge target visible area overflowing in the simulated overall contour.

[0016] Compared with existing technologies, the beneficial effects of this technical solution are as follows: by determining the location of corona discharge through ultraviolet imaging, the discharge target involving the discharge area can be identified in the visible light image, as well as the target range where the discharge target is located. This limits the identification range of the abnormal heating area in the thermal infrared image to the target range, thereby effectively filtering out the cluttered thermal infrared parameters other than the target range in the final three-light fusion image. Users can more quickly combine the abnormal heating area from the target range corresponding to the corona discharge location to make fault judgments, which is more conducive to users' fault judgment.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a circuit block diagram of the present invention;

[0020] Figure 2 This is a flowchart of the three-light fusion image processing in this invention. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figure 1-2 A corona detection ultraviolet imager includes an image processing module 1, a controller 2, a visible light image acquisition module 3, an ultraviolet image acquisition module 4, a thermal infrared image acquisition module 5, and an image display module 6.

[0023] The visible light image acquisition module 3 is used to acquire the visible light image of the observation area, the ultraviolet image acquisition module 4 is used to acquire the ultraviolet image of the observation area, and the thermal infrared image acquisition module 5 is used to acquire the thermal infrared image of the observation area.

[0024] The controller 2 performs edge detection on the corona spot in the ultraviolet image through the image processing module 1 to obtain the corona discharge region containing edge point coordinate information. The corresponding ultraviolet spot image of the corona discharge region is obtained through threshold segmentation. The controller 2 extracts the discharge target involving the corona discharge region from the visible light image and performs edge detection on the discharge target to obtain the target range containing edge point coordinate information. The controller 2 reads the thermal infrared parameters of the target range where the discharge target is located in the thermal infrared image to determine the abnormal heating area within the target range. The corresponding thermal infrared image of the abnormal heating area is obtained through threshold segmentation. The visible light image, the ultraviolet spot image, and the thermal infrared image of the abnormal heating area are fused to form a three-light fusion image. The controller 2 outputs and displays the three-light fusion image through the image display module 6.

[0025] By determining the location of corona discharge through ultraviolet imaging, the discharge target involving the discharge area and the target range of the discharge target can be identified in the visible light image. This limits the identification range of the abnormal heating area in the thermal infrared image to the target range, thus effectively filtering out the cluttered thermal infrared parameters other than the target range in the final three-light fusion image. Users can more quickly combine the abnormal heating area with the target range corresponding to the corona discharge location to make fault judgments, which is more conducive to the user's fault diagnosis.

[0026] In some embodiments, the image display module may be a display device with image display function, such as an LCD display or an OLED display.

[0027] In some embodiments, the target range where the discharge target is located can be determined by: acquiring the contour information of the discharge target in a visible light image and calculating the features of the discharge target; comparing the obtained discharge target features with the target features in a typical power grid equipment database to determine the structural component type of the extracted discharge target; after determining the type of the discharge target, acquiring the size of the structural component of that type in the typical power grid equipment database; and determining the simulated full-view contour of the discharge target based on the obtained contour information to obtain the simulated full-view area of ​​the discharge target.

[0028] The target range includes the visible area of ​​the discharge target defined by the visible contour obtained in the visible light image of the discharge target, and the simulated area of ​​the discharge target that overflows the visible area of ​​the discharge target in the simulated overall contour.

[0029] Taking insulators and equalizing rings as examples, by simulating the overall outline, the target range can include the connection parts of the discharge structure that are blocked. When determining the abnormal heating area within the target range, the connection parts that are easily overlooked can be included, making it easier for users to judge abnormal situations.

[0030] In some embodiments, when the corona discharge region and the abnormal heating region overlap, an alarm is displayed at the overlapping area in the fused image.

[0031] In some embodiments, the alarm is displayed by making the brightness of the corresponding overlapping area in the fused image different from the brightness of the corresponding area in the visible light image, different from the brightness of the corresponding area in the ultraviolet image, and different from the brightness of the corresponding area in the thermal infrared image.

[0032] In some embodiments, the alarm is displayed by making the color of the overlapping area in the fused image different from the color of the corresponding area in the visible light image, different from the color of the corresponding area in the ultraviolet image, and different from the color of the corresponding area in the thermal infrared image.

[0033] In some embodiments, temperature value information corresponding to the abnormal heating area is generated in the three-light fusion image.

[0034] In some embodiments, the method further includes infrared ranging of the abnormally heated area in the thermal infrared image to generate distance value information.

[0035] Preferably, the distance information is the distance to the farthest point of the abnormal heating area and / or the distance to the nearest point of the abnormal heating area and / or the distance based on the center point of the abnormal heating area.

[0036] The method for determining the center point of the abnormal heating area is to perform geometric feature analysis on the abnormal heating area to obtain the center location of the abnormal heating area.

[0037] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A corona-detecting ultraviolet imager, comprising: The image processing module, the controller, the visible light image acquisition module, the ultraviolet image acquisition module, the thermal infrared image acquisition module, and the image display module are included. The visible light image acquisition module is configured to acquire a visible light image of an observation area, the ultraviolet image acquisition module is configured to acquire an ultraviolet image of the observation area, and the thermal infrared image acquisition module is configured to acquire a thermal infrared image of the observation area. The controller performs edge detection on the corona light spot in the ultraviolet image through the image processing module to obtain a corona discharge region containing edge point coordinate information, and obtains an ultraviolet light spot image corresponding to the corona discharge region through threshold segmentation. The controller extracts a discharge target related to the corona discharge region in the visible light image, and performs edge detection on the discharge target to obtain a target range containing edge point coordinate information. The controller performs thermal infrared parameter reading on the target range where the discharge target is located in the thermal infrared image, determines an abnormal heating region in the target range, and obtains a thermal infrared image corresponding to the abnormal heating region through threshold segmentation. The controller fuses the visible light image, the ultraviolet light spot image, and the thermal infrared image of the abnormal heating region to form a three-light fusion image. The controller outputs and displays the three-light fusion image through the image display module.

2. The corona detecting ultraviolet imager according to claim 1, wherein When the corona discharge region and the abnormal heating region overlap, the overlapping part is displayed in the fusion image.

3. The corona detecting ultraviolet imager of claim 2, wherein, The display brightness of the overlapping part in the fusion image is different from the brightness of the corresponding region in the visible light image, different from the brightness of the corresponding region in the ultraviolet image, and different from the brightness of the corresponding region in the thermal infrared image.

4. The corona detecting ultraviolet imager according to claim 2 or 3, characterized in that, The display color of the overlapping part in the fusion image is different from the color of the corresponding region in the visible light image, different from the color of the corresponding region in the ultraviolet image, and different from the color of the corresponding region in the thermal infrared image.

5. The corona detecting ultraviolet imager according to claim 1, wherein, Temperature value information corresponding to the abnormal heating region is generated in the three-light fusion image.

6. The corona detecting ultraviolet imager according to claim 1 or 5, wherein Infrared ranging is performed on the abnormal heating region in the thermal infrared image to generate distance value information.

7. The corona detecting ultraviolet imager of claim 6, wherein, The distance value information includes the farthest point distance of the abnormal heating region, the nearest point distance of the abnormal heating region, and / or the distance based on the center point position of the abnormal heating region.

8. The corona detecting ultraviolet imager according to claim 7, wherein, The center point position of the abnormal heating region is determined by performing geometric feature analysis on the abnormal heating region.

9. The UV imaging detector for detecting corona according to claim 1 or 2 or 3 or 5 or 7 or 8, wherein, The contour information of the discharge target is obtained in the visible light image, and the features of the discharge target are calculated. The features of the discharge target are compared with the target features in the typical power grid equipment database to determine the structure type of the extracted discharge target. After determining the type of the discharge target, the size of the structure of the same type in the typical power grid equipment database is obtained, the simulation overall contour of the discharge target is determined based on the obtained contour information, and the simulation overall region of the discharge target is obtained.

10. The corona-detecting ultraviolet imager of claim 9, wherein, The target range includes the visible region range of the discharge target defined by the visible contour obtained in the visible light image, and the simulation region range of the simulation overall contour that exceeds the visible region of the discharge target.

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