Unit inspection system

Abstract

To provide a highly accurate unit inspection system by which quantifying a variation of a movable part of the unit is facilitated at low cost.SOLUTION: A unit inspection system 50 comprises a unit inspection device 53 comprising: a camera 51 for imaging a movable part 44C of a photographic object unit 100, and a symbol 30 arranged at the movable part 44C; and a data analysis part 53C for analyzing a variation of the symbol 30 from a plurality of pieces of image data imaged by the camera 51, and thus the highly accurate unit inspection system 50 by which quantifying a variation of the movable part 44C of the unit 100 is facilitated at low cost can be provided.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to an inspection system for equipment. [Background technology]

[0002] Some electrical equipment inspection systems are installed in order to automate daily and periodic inspections of electrical equipment such as distribution boards, panel boards, and control panels. For example, in Patent Document 1, an X-ray camera, an infrared camera, and a visible light camera are arranged on rails installed on the inner wall of the electrical equipment, and images taken by the various cameras from multiple positions at the time of installation and maintenance of the equipment are compared to determine whether there is an abnormality in the equipment in a determination unit.

[0003] In addition, in Patent Document 2, a light source that turns on and off depending on the open / closed state and changes color depending on the power supply voltage is placed at the tip of the molded case circuit breaker operating lever, and the open / closed state of the molded case circuit breaker and the power supply voltage are determined from the image obtained by photographing the light source with a surveillance camera. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2020-156131 [Patent Document 2] Japanese Patent Application Laid-Open No. 2001-338566 Summary of the Invention [Problem to be solved by the invention]

[0005] The inspection system described in Patent Document 1 must directly determine whether or not there are any abnormalities from images of the equipment taken with a camera. Therefore, in order to quantify the equipment's operation, deformation, etc., an algorithm is required to detect characteristic parts of the equipment, such as the edges (outline) and color, from the image and calculate coordinates, etc.

[0006] The appearance of these features changes depending on the position of the camera taking the picture, the shooting environment such as weather and illuminance, and the presence of foreign matter such as dust, and the features themselves also change depending on the manufacturer, product, model number, inspection target, etc., so an algorithm that can handle a wide variety of advanced features is required. This not only increases the cost of technology development, but also requires a high-performance detector to process the algorithm, posing a problem of increasing the cost of the inspection system.

[0007] Furthermore, the inspection system described in Patent Document 2 determines the status of equipment from the lighting state of light-emitting diodes attached to molded-case circuit breakers, which incurs the cost of parts for the light-emitting diodes, the cost of installation, and the labor required for installation. Furthermore, because the light-emitting diodes are attached to the operating lever, the diodes can come into contact with the user's hand when the lever is manually operated, hindering work. Furthermore, to stably and accurately calculate the coordinates of the light-emitting diodes from captured images, an algorithm is required that can handle not only changes in the shooting environment, such as weather and illuminance, but also changes in brightness due to deterioration of the light-emitting diodes themselves and the attachment of foreign matter.

[0008] Furthermore, because it is difficult to distinguish between reflected light from surrounding objects such as metal parts, restrictions arise, such as adjusting the camera's shooting angle or shooting distance to narrow the angle of view and prevent reflected light from being captured.As a result, it becomes necessary to move the camera away from the object to widen the angle of view, making it impossible to distinguish between multiple locations simultaneously, and so many cameras must be installed, which increases the cost of the inspection system.

[0009] The present disclosure has been made to solve the above-mentioned problems, and aims to provide an inexpensive, highly accurate equipment inspection system that makes it easy to quantify fluctuations in the moving parts of the equipment. [Means for solving the problem]

[0010] The equipment inspection system according to the present disclosure comprises: a camera for photographing a movable part of the device to be photographed and a symbol placed on the movable part; and a data analysis unit that analyzes the fluctuation of the symbol from the plurality of image data captured by the camera. [Effects of the Invention]

[0011] According to the equipment inspection system disclosed herein, it is possible to provide an inspection system that is easy to quantify fluctuations in moving parts of equipment, is inexpensive, and has high accuracy. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a partial cross-sectional schematic view showing the configuration of a vacuum circuit breaker according to a first embodiment; [Figure 2] Fig. 2A is a front view of the operating lever of the opening / closing mechanism, and Fig. 2B is an enlarged view of a two-dimensional barcode attached to the shaft (rotating part) of the operating lever. [Figure 3] 1 is a front view of a vacuum circuit breaker according to a first embodiment. [Figure 4] Fig. 4A is a diagram showing an example of a symbol according to embodiment 1. Fig. 4B is a diagram showing an example of a symbol according to embodiment 1. Fig. 4C is a diagram showing an example of a symbol according to embodiment 1. Fig. 4D is a diagram showing an example of a symbol according to embodiment 1. [Figure 5] 1 is a block diagram showing the configuration of a device inspection system according to a first embodiment. [Figure 6] 4 is a flowchart showing the operation of the inspection device according to the first embodiment. [Figure 7] FIG. 10 is a block diagram showing the configuration of a device inspection system according to a second embodiment. [Figure 8] 10 is a flowchart showing the operation of the inspection device according to the second embodiment. [Figure 9] FIG. 11 is a front view of a main part showing the configuration of an opening / closing portion of a disconnector according to a third embodiment. [Figure 10] FIG. 10 is a block diagram showing the configuration of a device inspection system according to a fourth embodiment. [Figure 11] FIG. 10 is a front view of a high-voltage phase advance capacitor according to a fourth embodiment. [Figure 12] 12A and 12B are side views of the high-voltage phase advance capacitor during manufacture and after deterioration, respectively. [Figure 13] 10 is a flowchart showing an analysis procedure of a data analysis unit according to the fourth embodiment. [Figure 14] Fig. 14A is a schematic diagram showing image data of a two-dimensional barcode after deformation, and Fig. 14B is a schematic diagram showing the virtual arrow height h1. [Figure 15] FIG. 1 is a block diagram showing an example of a hardware configuration of an inspection device according to first to fourth embodiments. DETAILED DESCRIPTION OF THE INVENTION

[0013] Embodiment 1 Hereinafter, a device inspection system 50 according to the first embodiment (hereinafter simply referred to as the inspection system 50) will be described with reference to the drawings. Before describing the configuration of the inspection system 50, the configuration of a vacuum circuit breaker 100 (device) will be described as an example of a device to be inspected by the inspection system 50. FIG. 1 is a schematic partial cross-sectional view showing the configuration of a vacuum circuit breaker 100 according to the first embodiment. FIG. 2A is a front view of the operating lever 44 of the opening / closing mechanism 4. FIG. FIG. 2B is an enlarged view of the two-dimensional barcode 30 attached to the shaft 44C (rotating portion) of the operating lever 44. FIG. 3 is a front view of the vacuum circuit breaker 100. As shown in FIG. 4A to 4E are diagrams showing examples of symbols.

[0014] The vacuum circuit breaker 100 comprises a vacuum interrupter 7 and a switching mechanism 4 that opens and closes a fixed contact 7A and a movable contact 7B, both of which are housed in the vacuum interrupter 7 and have electrical conductivity.

[0015] The vacuum interrupter 7 comprises an insulating container 71, a fixed contact 7A, a movable contact 7B, a fixed end plate 72A, a movable end plate 72B, a fixed electrode 73A, a movable electrode 73B, and a bellows 74. The insulating container 71 is a cylindrical container made of an insulating material such as ceramic or glass. The fixed end plate 72A seals the axial end of the insulating container 71 on the fixed contact 7A side. The movable end plate 72B seals the axial end of the insulating container 71 on the movable contact 7B side.

[0016] The fixed contact 7A is fixed to the fixed end plate 72A via a fixed electrode rod 73A. The upper end of the fixed electrode rod 73A is connected to the fixed conductor 9A outside the insulating container 71. The movable contact 7B is arranged opposite the fixed contact 7A so as to be able to move toward and away from the fixed contact 7A, and is connected to a rod-shaped electrode rod 73B. The movable electrode rod 73B is a conductive shaft rod. The movable electrode rod 73B passes through the movable end plate 72B and extends to the outside of the vacuum interrupter 7. The lower end of the movable electrode rod 73B is connected to the movable conductor 9B.

[0017] The bellows 74 is disposed around the movable electrode rod 73B inside the vacuum valve 7, and seals the vacuum inside the vacuum valve 7 even when the movable electrode rod 73B moves in the axial direction. The vacuum valve 7 configured in this way can open and close the movable contact 7B relative to the fixed contact 7A while maintaining the vacuum inside the vacuum valve 7.

[0018] Next, the opening and closing mechanism 4 will be described. The opening / closing mechanism 4 includes a movable-side sliding shaft 41 whose upper end is connected to the movable-side electrode bar 73B, an insulating operation rod 42 on the inside of which the movable-side sliding shaft slides, a wipe spring 43 that urges the movable-side sliding shaft 41 inside the insulating operation rod 42, an operation mechanism 45, and an operation lever 44 that connects the operation mechanism 45 and the insulating operation rod 42. The operation mechanism 45 drives the insulating operation rod 42 via the operation lever 44.

[0019] A shaft 44A provided at one end 44T1 of the operating lever 44 is inserted into a bearing 42G provided at the lower end 42U of the insulating operating rod 42, and the operating lever 44 is rotatably connected to it. Furthermore, a shaft 44B provided at the other end 44T2 of the operating lever 44 is inserted into a bearing 45A1 provided at the lower end of a spring operating rod 45A of the operating mechanism 45, and the operating lever 44 is rotatably connected to it. Furthermore, a shaft 44C provided at the center of the operating lever 44 in the longitudinal direction is rotatably supported by a bearing G1 of a support part (not shown).

[0020] The upper end of the wipe spring 43 is connected to the movable-side sliding shaft 41, and the lower end is connected to the insulating operation rod 42. The outer peripheral surface of the movable-side sliding shaft 41 and the inner peripheral surface of the insulating operation rod 42 are slidable relative to each other in the vertical direction.

[0021] As shown in Fig. 2, a QR code (registered trademark) which is a two-dimensional barcode 30 (symbol) is disposed on the front side of the shaft 44C which serves as a rotating part. The two-dimensional barcode 30 may also be attached to a movable part other than the shaft, and for example, as shown in Fig. 3, it may be disposed on the front side of the movable-side sliding shaft 41 which serves as a linear motion part. The two-dimensional barcode 30 may be the two-dimensional barcode shown in Fig. 2B, or may be symbols 30A to 30D which are simple figures such as circles, polygons, stars, etc., or composite figures in which a plurality of these are arranged vertically and horizontally, as shown in Figs. 4A to 4D. Furthermore, the colors of the symbols 30A to 30D may be colors other than black and white.

[0022] Next, the closing operation of the vacuum circuit breaker 100 will be described. When closing the circuit, a force is applied vertically downward to the other end 45T2 of the operating lever 44 via a spring or the like of the operating mechanism 45, causing the operating lever 44 to rotate counterclockwise around the shaft 44C. This causes the insulating operating rod 42 to move vertically upward while sliding on the movable-side sliding shaft 41 via the shaft 44A and a bearing 42G provided at the lower end of the insulating operating rod 42. As the insulating operating rod 42 moves vertically upward, the movable-side sliding shaft 41, the movable-side conductor 9B, the movable-side electrode rod 73B, and the movable-side contact 7B move vertically upward via the wipe spring 43, and come into contact with the fixed-side contact 7A.

[0023] After the movable side contact 7B comes into contact with the fixed side contact 7A, the operating mechanism 45 further applies a vertical downward force to push up the insulating operating rod 42, compressing the wipe spring 43 and applying contact pressure between the fixed side contact 7A and the movable side contact 7B, thereby completing the closing operation of the vacuum circuit breaker 100.

[0024] At this time, the two-dimensional barcode 30 placed in front of the shaft 44C of the operating lever 44 rotates counterclockwise together with the operating lever 44 and its shaft 44C in accordance with the closing operation. Also, if the two-dimensional barcode 30 is placed in front of the movable-side sliding shaft 41, the two-dimensional barcode 30 moves vertically upward in accordance with the closing operation of the vacuum circuit breaker 100.

[0025] When the vacuum circuit breaker 100 is opened, the operating mechanism 45 pulls up the spring operating rod 45A, thereby releasing the biasing force of the wipe spring 43 that was compressed when the circuit was closed. The force pushing the insulating operating rod 42 vertically downward rotates the operating lever 44 clockwise around the shaft 44C. The wipe spring 43 then expands, reducing the contact pressure between the fixed contact 7A and the moving contact 7B. After the contact pressure reaches zero, the continuing vertical force of the operating mechanism 45 and the inertial forces acting vertically downward on the moving sliding shaft 41, the moving conductor 9B, the moving electrode rod 73B, and the moving contact 7B separate the fixed contact 7A and the moving contact 7B to the state shown in FIG. 1, completing the opening operation.

[0026] The two-dimensional barcode 30 placed in front of the shaft 44C rotates clockwise together with the operating lever 44 and shaft 44C in accordance with the opening operation. As shown in Figure 3, when the two-dimensional barcode 30 is placed in front of the movable-side sliding shaft 41, which is the movable part, the two-dimensional barcode 30 moves vertically downward in accordance with the opening operation.

[0027] Next, the equipment inspection system 50 will be described. FIG. 5 is a block diagram showing the configuration of a device inspection system 50 (hereinafter simply referred to as the inspection system 50). FIG. 6 is a flowchart showing the operation of the inspection device 53. The inspection system 50 includes a fixed high-speed camera 51 that photographs the moving part of the target device (in the first embodiment, the vacuum circuit breaker 100) and the two-dimensional barcode 30 or other symbols 30A-30D placed on the moving part, a sensor 52 that monitors the state of the vacuum circuit breaker 100 so that the high-speed camera 51 can start photographing, and an inspection device 53. The sensor 52 may be a sensor attached to the moving part that operates before starting the opening and closing operation and detects physical movement, or a sensor that detects the flow of current, for example, the ON / OFF state of a switch. Furthermore, a control signal from a protective relay upon detection of a fault current may be used as a trigger to start photographing. Alternatively, an automatic inspection program may be prepared, which opens and closes the vacuum circuit breaker 100 using a battery or the like during a power outage and simultaneously starts photographing.

[0028] The inspection device 53 comprises a sensor monitoring unit 53A that monitors the sensor 52, a camera control unit 53B that controls the start of shooting, shooting interval, and end of shooting of the high-speed camera 51, a data analysis unit 53C that analyzes and calculates the movement amount including the movement distance of the two-dimensional barcode 30 and symbols 30A to 30D, movement speed, changes (fluctuations) in movement speed, etc., and angular velocity during movement from multiple image data captured by the high-speed camera 51 and the shooting interval of each image data, a data storage unit 53D that stores the calculated data, and a display unit 53E that displays the calculated data.

[0029] 6, when the sensor monitoring unit 53A detects an indication of operation of the vacuum circuit breaker 100 or opening / closing of the vacuum circuit breaker 100 due to an abnormal current (step S001), the camera control unit 53B instructs the high-speed camera 51 to start capturing an image of the two-dimensional barcode 30 (step S002). The high-speed camera 51 captures images at predetermined intervals and shutter speeds. After a predetermined time has elapsed, the camera control unit 53B instructs the high-speed camera 51 to end capturing an image (step S003).

[0030] Next, the data analysis unit 53C sequentially compares two consecutive captured image data to extract data from when the two-dimensional barcode 30 starts to move until it stops moving (step S004). Next, the data analysis unit 53C performs data analysis based on the image data captured by the high-speed camera 51 (step S005). The first data and the last data are compared to calculate the movement distance, and the average movement speed is calculated from the number of images captured during that time. If the two-dimensional barcode 30 is attached to a rotating part, the angular velocity is calculated. The movement speed may be calculated by comparing the data before and after each image data, or, for example, every third image data may be compared to calculate the increase or decrease in movement speed. Each piece of data calculated in this way is stored in the data storage unit 53D (step S006) and displayed on the display unit 53E (step S007).

[0031] The frame rate (FPS: Frames Per Second) is calculated by taking two or more images between the start and end points of the operation, assuming that the minimum distance between the contacts in the specifications of the vacuum circuit breaker 100 is d and the maximum switching speed is v. FPS>2V / d is the lower limit of the frame rate.

[0032] Also, if you attach an image of a star, square, triangle, etc. to the rotating part, the same shape may be captured multiple times during one rotation of the rotation axis. However, depending on the rotation angle of the target, calculation method, and frame rate, it can be used as follows. For example, in the case of a square symbol, if the rotation range is less than 90°, FPS>4ω / π(ω: Angular velocity [rad / s]) If the rotation angle of the symbol is uniquely determined, the rotation direction can also be determined. FPS>4ω / π(ω: Angular velocity [rad / s]) If so, it can be calculated by accumulating the rotation angles Δθ between the images.

[0033] According to the equipment inspection system of embodiment 1, the two-dimensional barcode 30 placed on the axis 44C of the operating lever 44 of the vacuum circuit breaker 100 is photographed using a high-speed camera or the like, and the rotation angle of the axis 44C is calculated from the photographed image data, and information on the amount of movement and angular velocity can be obtained.

[0034] Furthermore, by using the two-dimensional barcode 30 placed in front of the movable-side sliding shaft 41, the two-dimensional barcode 30 moves up and down in the vertical direction in accordance with the closing and opening operations of the vacuum circuit breaker 100. In this case as well, by taking pictures with the high-speed camera 51 during the closing and opening operations of the vacuum circuit breaker 100, the position coordinates of the two-dimensional barcode 30 can be calculated, and information on the movement distance and movement speed of the movable-side sliding shaft 41 can be obtained. The operating state of the vacuum circuit breaker 100 can be quantitatively grasped from the obtained change in position, movement distance, rotation angle, angular velocity, movement speed, etc.

[0035] Furthermore, depending on the environment and location where the high-speed camera 51 is used to capture images, it may be possible to obtain the same effect as the two-dimensional barcode 30 using symbols 30A to 30D, which are simple figures such as circles, polygons, stars, etc., as shown in Figures 4A to 4D, or composite figures made up of multiple of these arranged vertically and horizontally, using a simple algorithm.

[0036] Depending on the environment in which the device is installed, the use of colors other than black and white can improve camera identification. Furthermore, when processing symbols by metal engraving or resin molding rather than by attaching a sticker or the like, symbols 30A to 30D as shown in Figure 4, rather than two-dimensional barcode 30, have fewer irregularities and are therefore less costly to process, and are less susceptible to the accumulation of dust and other particles and are therefore more resistant to damage, which can improve the accuracy of analysis by data analysis unit 53C.

[0037] Furthermore, since it is possible to read data such as numbers, letters, kanji, kana, and symbols contained in two-dimensional barcodes, if names for the measurement areas are assigned in advance, they can be identified by a computer. Even if multiple locations are photographed together with the camera, if different names are assigned, it is easy to automatically identify each measurement area.

[0038] Furthermore, 2D barcodes can be read accurately even in dark places due to the contrast between black and white, and by adding a Reed-Solomon code, the code itself can restore the data even if part of the 2D barcode is soiled or damaged by dust, etc., making them resistant to changes in the shooting environment. Adding a finder pattern to a 2D barcode makes it possible to calculate the rotation angle, and adding an alignment pattern makes it possible to calculate linear and non-linear distortion, so even if the 2D barcode is attached at an angle to the high-speed camera, correction can be made and it can be detected without any problems.

[0039] With the above-mentioned function, a two-dimensional barcode placed on the moving part or rotation axis of the equipment can be photographed with a camera, and by calculating the coordinates and rotation angle of the two-dimensional barcode, it is possible to accurately and easily grasp changes over time in the equipment's operation, speed, displacement, etc.

[0040] Furthermore, by photographing multiple 2D barcodes with a camera, the computer can automatically identify them and simultaneously capture changes in multiple locations. Furthermore, because the system can be implemented simply by placing 2D barcodes and photographing them with a camera, even if the manufacturer, product, model number, or inspection target changes, it can be easily handled by simply affixing a 2D barcode printed on a sticker, for example.

[0041] The same effect can be achieved even in small areas by simply changing the print size, and depending on the material of the sticker, such as paper, it is possible to prevent light reflection and improve detection accuracy, and it is also possible to prevent dirt and deterioration by coating. Furthermore, if detection of the 2D barcode becomes difficult due to deterioration, dirt, or damage, it can be resolved by simply reprinting and reattaching. This inspection system does not require advanced algorithms, is inexpensive, easy to install, and allows for safe, quantitative remote automatic monitoring of fluctuations in the equipment's condition using a computer.

[0042] Embodiment 2 Hereinafter, a device inspection system 250 according to the second embodiment will be described with reference to the drawings, focusing on the differences from the first embodiment. FIG. 7 is a block diagram showing the configuration of a device inspection system 250 (hereinafter simply referred to as inspection system 250). FIG. 8 is a flowchart showing the operation of the inspection device 253. The difference between the inspection device 253 of this embodiment 2 and the inspection device 53 described in embodiment 1 is that the inspection device 253 is equipped with a judgment unit 53F that judges the soundness of the equipment and a reference data table 53T that is used by the judgment unit 53F.

[0043] The reference data table 53T stores reference data such as the angular velocity, movement amount, movement speed, and rotation angle of the shaft 44C when the vacuum circuit breaker 100 described above is closed and opened in a state (brand new) manufactured according to specifications. The determination unit 53F compares the transition of the angular velocity of the shaft 44C analyzed by the data analysis unit 53C based on image data captured by the high-speed camera 51 with the standard data stored in the reference data table 53T (step S051). If there is a speed decrease of about a predetermined threshold (e.g., 5%), the determination unit 53F determines that a problem such as deterioration has occurred in the wipe spring 43, and determines the need for overhaul and displays a warning on the display unit 53E (step S071). The other configurations are the same as those of the inspection device 53 of the first embodiment.

[0044] The equipment inspection system 250 according to the second embodiment has the same effects as those of the first embodiment. In addition, since the system is provided with the determination unit 53F and the reference data table 53T, it is possible to automatically determine items requiring inspection of the equipment, and to automatically determine minor abnormalities in the equipment to be inspected at an early stage.

[0045] Embodiment 3 The device inspection system according to the third embodiment will be described below with reference to the drawings, focusing on the differences from the first and second embodiments. The inspection system for the equipment used in the third embodiment is the same inspection system 250 as in the second embodiment. In the third embodiment, another example of equipment to be inspected will be described.

[0046] FIG. 9 is a front view of the essential parts showing the configuration of the opening and closing portion of a disconnector 60 according to the third embodiment. In the first and second embodiments, a vacuum circuit breaker 100 is used as the target device, but in the third embodiment, as shown in FIG. 9, a case will be described in which the target device is a circuit breaker 60 and an inspection system 250 (see FIG. 7) is used.

[0047] The disconnector 60 has a fixed electrode 64 and a movable electrode 65 . The fixed electrode 64 is configured by joining a contact piece 64B having an electrical contact surface 64BS to a disconnector current conductor 64A. The movable electrode 65 consists of a current-carrying conductor 65A with a bearing 65AR at its tip, and a movable blade 65B with a shaft 65B1 at one end 65BT1 that is rotatably fitted into the bearing 65AR of the current-carrying conductor 65A and that can rotate around the shaft 65B1.

[0048] A two-dimensional barcode 30 is arranged in front of the other end 65BT2 of the movable blade 65B, which is the tip of the fixed electrode 64. The two-dimensional barcode 30 may be arranged in front of the shaft 65B1. Instead of the two-dimensional barcode 30, symbols 30A to 30D, which are simple figures such as a circle, polygon, or star, or composite figures in which multiple such figures are arranged vertically and horizontally, as shown in Figure 4, may be used. Furthermore, the colors of each figure may be colors other than black and white.

[0049] When the disconnector 60 is closed, the movable blade 65B rotates counterclockwise around the shaft 65B1, and the closing operation is completed when the tip of the movable blade 65B comes into contact with the electrical contact surface 64BS of the contact piece 64B. The two-dimensional barcode 30 placed in front of the tip of the movable blade 65B moves in an arc in accordance with the closing operation of the disconnector 60. If the two-dimensional barcode 30 is placed in front of the shaft 65B1, the two-dimensional barcode 30 will rotate in accordance with the closing operation of the disconnector 60.

[0050] When the disconnector 60 is opened, the shaft 65B1 rotates clockwise, and the movable blade 65B separates from the electrical contact surface 64BS and moves to the position shown in Figure 9, completing the opening operation. The two-dimensional barcode 30 placed in front of the tip of the movable blade 65B moves in an arc in accordance with the opening operation. If the two-dimensional barcode 30 is placed in front of the shaft 65B1, the two-dimensional barcode 30 will rotate in accordance with the opening operation.

[0051] In the case of the disconnector 60, the two-dimensional barcode 30 placed in front of the tip of the movable blade 65B moves in an arc in accordance with the closing and opening operations, so by photographing this with the high-speed camera 51, the coordinates of the two-dimensional barcode 30 can be calculated and information on the amount of movement and angular velocity can be obtained. Also, if the two-dimensional barcode 30 is placed in front of the shaft 65B1, the two-dimensional barcode 30 rotates in place in accordance with the closing and opening operations, so by similarly photographing it with the high-speed camera 51, the rotation angle of the two-dimensional barcode 30 can be calculated and information on the rotation angle and angular velocity can be obtained.

[0052] From the obtained movement amount, rotation angle, angular velocity, etc., fluctuations in the operating state of the disconnector 60 can be quantitatively grasped. Furthermore, depending on the environment and location where the image is taken by the high-speed camera 51, the same effect as the two-dimensional barcode 30 can be obtained with a simple algorithm even if symbols 30A to 30D, which are simple figures such as circles, polygons, and stars, or composite figures in which multiple of these are arranged vertically and horizontally, as shown in Figure 4, are used instead of the two-dimensional barcode 30. Furthermore, depending on the surrounding environment, the identification ability by the high-speed camera 51 can be improved by using colors other than black and white.

[0053] Furthermore, when processing is performed by metal engraving, resin molding, or the like rather than by attaching a sticker or the like, symbols 30A to 30D as shown in Figure 4, rather than two-dimensional barcode 30, have fewer irregularities and are therefore less expensive to process, and are also less susceptible to dust and other particles accumulating and are therefore more resistant to damage, thereby improving the accuracy of analysis by data analysis unit 53C.

[0054] According to the device inspection system of the third embodiment, the same effects as those of the second embodiment are achieved.

[0055] Embodiment 4 The device inspection system according to the fourth embodiment will be described below with reference to the drawings, focusing on the differences from the first to third embodiments. FIG. 10 is a block diagram showing the configuration of a device inspection system 450 (hereinafter simply referred to as the inspection system 450). FIG. 11 is a front view of the high-voltage phase advance capacitor 80. As shown in FIG. FIG. 12A is a side view of high-voltage phase advance capacitor 80 during manufacturing. FIG. 12B is a side view of high-voltage phase advance capacitor 80 after deterioration. FIG. 13 is a flowchart showing the analysis procedure of the data analysis unit 453C. FIG. 14A is a schematic diagram showing image data of a two-dimensional barcode after transformation. FIG. 14B is a schematic diagram showing the virtual arrow height h1.

[0056] Inspection device 453 used in embodiment 4 includes data analysis unit 453C instead of data analysis unit 53C in embodiments 1 to 3. As another example of equipment to be inspected, an example will be described in which high-voltage phase-advance capacitor 80 is the target. Reference data table 453T stores reference image data obtained by photographing high-voltage phase-advance capacitor 80 manufactured in accordance with specifications and in a state in which two-dimensional barcode 30 is arranged (when new), and measurement values ​​of the actual distance between dots (including diagonals) arranged at the outer corners of two-dimensional barcode 30.

[0057] High-voltage phase-advance capacitor 80 comprises a main body case 81 containing a capacitor element and the like, a bushing 82, an insulating cap 83, and mounting feet 84, and a two-dimensional barcode 30 is disposed on the front surface (deformation prediction portion) of main body case 81. Two-dimensional barcode 30 may be symbols 30A to 30D, which are simple figures such as a circle, polygon, or star, as shown in Fig. 4, or composite figures in which a plurality of these are arranged vertically and horizontally. Furthermore, the colors of each figure may be colors other than black and white.

[0058] When the internal elements of high-voltage phase advance capacitor 80 deteriorate and insulation breakdown occurs, an overcurrent flows, and the heat of an internal arc caused by the burning and carbonization of the elements causes the insulating oil to decompose and gasify, increasing the internal pressure inside main body case 81. Then, compared to high-voltage phase advance capacitor 80 in a normal state shown in Fig. 12A, in high-voltage phase advance capacitor 80 after deterioration shown in Fig. 12B, main body case 81 expands. As main body case 81 expands, the two-dimensional barcode 30 placed in front of it also distorts.

[0059] By photographing the front of the expanded main body case 81 with high-speed camera 51, data analysis unit 453C compares the image data in normal times with the image data after expansion to calculate the degree of distortion of the front of high-voltage phase advanced capacitor 80. By obtaining information on the amount of deformation before and after deformation, it is possible to quantitatively grasp the progression of abnormalities due to deformation of high-voltage phase advanced capacitor 80 and determine the soundness of high-voltage phase advanced capacitor 80. If a threshold value for the tolerance range of deformation is set and the deformation exceeds the threshold value, a warning is displayed using determination unit 53F, as in embodiment 2.

[0060] A specific analysis method of the data analysis unit 453C will be explained below. In the following description, [mm] represents the measured distance, and [px] represents the distance converted into the number of pixels. First, information on the actual distance S1 [mm] between the dots at the four corners of the square two-dimensional barcode 30 (in the case of a QR code (registered trademark): position detection patterns located at three corners, called finder patterns) before it is attached to the high-voltage phase advance capacitor 80 is obtained from the reference data table 453T (step S401).

[0061] Next, image data of the two-dimensional barcode 30 attached to the surface of the high-voltage phase-advance capacitor 80 at the time of manufacture (before deformation) shown in Figure 11 is obtained from the reference data table 453T, and the dots at the four corners of the two-dimensional barcode 30 are detected from the obtained image by pattern matching, and the dot-to-dot distance S2 [px] of the high-voltage phase-advance capacitor 80 manufactured according to the specifications is calculated (step S402).

[0062] Next, the dots at the four corners of the two-dimensional barcode attached to the surface of the high-voltage phase-advance capacitor 80 after deformation as shown in Figure 12B are detected using pattern matching from image data captured in a similar manner, and the distance S3 [px] between two of the dots is calculated (step S403).

[0063] Assuming that the two dots after deformation are on the circumference R of a circle with radius r, the distance S2 between the dots before deformation can be regarded as the arc length, and the distance S3 between the dots after deformation can be regarded as the chord length, so S3=2rsin(S2 / 2r) This is solved by an iterative method such as the Newton-Raphson method to calculate r (step S404).

[0064] Next, the virtual arrow height h1 is h1=r*(1-cos(S2 / 2r))(Equation 1) (step S405). Next, h1 [px] calculated by Equation 1 is multiplied by S1 / S2 to calculate the actual arrow height h2 [mm] (step S406). The above steps are repeated between the dots at the four corners of the image data of the two-dimensional barcode 30 to calculate the actual arrow height h2 between each dot. The calculated multiple actual arrow heights h2 are used as indicators of the expansion of the high-voltage phase advance capacitor 80.

[0065] In this way, if the format and code content (character information) of a two-dimensional barcode are known in advance, the dot pattern is uniquely determined, and more precise calculations can be made by using pattern matching to include the distance between dots other than those at the four corners in the calculation.By creating a heat map using the obtained radius r, the curvature of each part can be visualized and the degree of expansion can be evaluated.

[0066] Furthermore, depending on the environment and location where the high-speed camera 51 is used to capture images, the same effect as the two-dimensional barcode 30 can be achieved with a simple algorithm even if symbols 30A to 30D, which are simple figures such as circles or polygons as shown in Figure 4 or composite figures made up of multiple of these arranged vertically and horizontally, are used instead of the two-dimensional barcode 30.

[0067] Depending on the surrounding environment, the use of colors other than black and white can improve the discrimination ability of the high-speed camera 51. Furthermore, by alternately arranging the same figures as in symbol 30D in Fig. 4D, the algorithm for detecting the skewness can be simplified, and the skewness of each part in the symbol can be calculated stably and accurately, thereby improving the detection accuracy of the expansion caused by the high-voltage phase-advancing capacitor 80.

[0068] FIG. 15 is a block diagram showing an example of the hardware configuration of the inspection device 53, 253, 453. The inspection device 53, the inspection device 253, and the inspection device 453 are each composed of a processor 90 and a storage device 91. The storage device 91 includes a volatile storage device such as a random access memory, not shown, and a non-volatile auxiliary storage device such as a flash memory. Alternatively, an auxiliary storage device such as a hard disk may be provided instead of the flash memory. The processor 90 executes a program input from the storage device 91. In this case, the program is input to the processor 90 from the auxiliary storage device via the volatile storage device. The processor 90 may output data such as calculation results to the volatile storage device of the storage device 91, or may store the data in the auxiliary storage device via the volatile storage device.

[0069] Although the present disclosure describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments are not limited to application to a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless variations not exemplified are conceivable within the scope of the technology disclosed in this specification, including, for example, cases where at least one component is modified, added, or omitted, and cases where at least one component is extracted and combined with components of another embodiment.

[0070] Various aspects of the present disclosure are summarized below as appendices.

[0071] (Appendix 1) a camera for photographing a movable part of the device to be photographed and a symbol placed on the movable part; and a data analysis unit that analyzes fluctuations in the symbol from multiple image data captured by the camera. (Appendix 2) the movable part is any one of a linear motion part, a rotation part, and a deformation prediction part, The equipment inspection system described in Appendix 1, wherein the fluctuation is at least one of a change in position, a movement amount, a movement speed, a rotation angle, and a distortion corresponding to the linear motion part, the rotation part, and the deformation prediction part. (Appendix 3) The inspection device for the equipment includes: a reference data table in which the variations during manufacturing of the linear motion unit and the rotary unit of the device are stored as reference data; An equipment inspection system as described in Appendix 2, comprising a judgment unit that compares the fluctuations analyzed by the data analysis unit with the reference data to judge the soundness of the moving part. (Appendix 4) The inspection device for the equipment includes: a reference data table that stores reference image data of the device at the time of manufacture having the deformation prediction unit and measurement values ​​of actual distances between dots arranged at corners of the outer periphery of the symbol; The data analysis unit compares the current image data of the device with the reference image data stored in the reference data table to analyze the fluctuation of the deformation prediction unit; 3. An inspection system for equipment according to claim 2, further comprising a determination unit that determines the soundness of the equipment from the analysis results of the data analysis unit. (Appendix 5) The equipment inspection system according to Appendix 3, wherein the equipment is a circuit breaker, and the symbol is located on the front of a movable rotating shaft or a movable part that separates the insulating operating rod of the circuit breaker. (Appendix 6) 4. An inspection system for equipment as described in Appendix 3, wherein the equipment is a circuit breaker, and the symbol is located in front of a rotating blade that disconnects the electrical circuit of the circuit breaker or in front of the rotation axis of the rotating blade. (Appendix 7) 5. An inspection system for an equipment as described in Appendix 4, wherein the equipment is a capacitor and the symbol is located on the front of a case of the capacitor. (Appendix 8) 8. An equipment inspection system according to any one of claims 1 to 7, wherein the symbol is a two-dimensional barcode. (Appendix 9) An equipment inspection system according to any one of appendices 1 to 7, wherein the symbol is a single figure or a composite figure in which multiple single figures are arranged vertically and horizontally. (Appendix 10) 10. An inspection system for an equipment according to any one of claims 1 to 9, wherein the symbols are black and white. (Appendix 11) 10. An inspection system for an equipment according to any one of claims 1 to 9, wherein the symbol is a color other than black and white. (Appendix 12) An inspection system for equipment described in any one of Supplementary Note 1 to Supplementary Note 9, wherein the symbol is engraved on the movable part. [Explanation of symbols]

[0072] 100 vacuum circuit breakers, 50,250,450 equipment inspection systems, 30 Two-dimensional barcode, 30A, 30B, 30C, 30D symbols, 4 opening and closing mechanism, 41 moving side sliding shaft, 42 insulating operation rod, 42G bearing, 42U lower end, 43 wipe spring, 44 operation lever, 44A, 44B, 44C shaft, 44T1 one end, 44T2 other end, 45 operation mechanism, 45A spring operation rod, 45A1 bearing, 45T2 other end, 53,253,453 inspection device, 53A sensor monitoring unit, 53B camera control unit, 53C, 453C data analysis unit, 53D data storage unit, 53E display unit, 53F judgment unit, 53T, 453T reference data table, 51 high-speed camera, 52 sensor, 60 disconnector, 64 fixed electrode, 64A Disconnector current-carrying conductor, 64B Contact piece, 64BS Electrical contact surface, 65 Movable side electrode, 65A current conductor, 65AR bearing, 65B movable blade, 65B1 shaft, 65BT1 one end, 65BT2 other end, 7 vacuum valve, 71 insulating container, 72A Fixed side end plate, 72B Movable side end plate, 73A Fixed side electrode rod, 73B Movable electrode rod, 74 Bellows, 7A Fixed contact, 7B Movable contact, 80 high-voltage phase advance capacitor, 81 main body case, 82 bushing, 83 insulating cap, 84 mounting foot, 90 processor, 91 storage device, 9A fixed side conductor, 9B movable side conductor, G1 bearing, r radius, S1 distance, S2 distance between dots, S3 distance between dots, Δθ rotation angle, h1 virtual arrow height, h2 Miya Taka.

Claims

1. a camera for photographing a movable part of the device to be photographed and a symbol placed on the movable part; and a data analysis unit that analyzes fluctuations in the symbol from multiple image data captured by the camera.

2. the movable part is any one of a linear motion part, a rotation part, and a deformation prediction part, The equipment inspection system according to claim 1 , wherein the fluctuation is at least one of a change in position, a movement amount, a movement speed, a rotation angle, and a skewness corresponding to the linear motion part, the rotating part, and the deformation prediction part.

3. The inspection device for the equipment includes: a reference data table in which the fluctuations in the state of the linear motion part and the rotary part of the device at the time of manufacture are stored as reference data; The equipment inspection system according to claim 2 , further comprising a determination unit that compares the fluctuation analyzed by the data analysis unit with the reference data to determine the soundness of the movable part.

4. The inspection device for the equipment includes: a reference data table that stores reference image data of the device at the time of manufacture having the deformation prediction unit and measurement values ​​of actual distances between dots arranged at corners of the outer periphery of the symbol; The data analysis unit compares the current image data of the device with the reference image data stored in the reference data table to analyze the fluctuation of the deformation prediction unit; The equipment inspection system according to claim 2 , further comprising a determination unit that determines the soundness of the equipment based on the analysis result of the data analysis unit.

5. 4. The equipment inspection system according to claim 3, wherein the equipment is a circuit breaker, and the symbol is located on a front surface of a movable rotating shaft or a front surface of a movable part that separates an insulating operating rod of the circuit breaker.

6. 4. The equipment inspection system according to claim 3, wherein the equipment is a circuit breaker, and the symbol is located in front of a rotating blade that disconnects an electrical circuit of the circuit breaker or in front of a rotation shaft of the rotating blade.

7. 5. The device inspection system according to claim 4, wherein the device is a capacitor, and the symbol is located on the front of a case of the capacitor.

8. The equipment inspection system according to claim 1 , wherein the symbol is a two-dimensional barcode.

9. 8. The equipment inspection system according to claim 1, wherein the symbol is a single graphic or a composite graphic in which a plurality of the single graphics are arranged vertically and horizontally.

10. The equipment inspection system according to any one of claims 1 to 7, wherein the symbols are black and white.

11. The equipment inspection system according to claim 1 , wherein the symbols are in a color other than black and white.

12. The equipment inspection system according to any one of claims 1 to 7, wherein the symbol is engraved on the movable part.

Images