CN114859221A - Circuit breaker opening and closing speed measuring method and device based on linear array camera - Google Patents
Circuit breaker opening and closing speed measuring method and device based on linear array camera Download PDFInfo
- Publication number
- CN114859221A CN114859221A CN202210487468.2A CN202210487468A CN114859221A CN 114859221 A CN114859221 A CN 114859221A CN 202210487468 A CN202210487468 A CN 202210487468A CN 114859221 A CN114859221 A CN 114859221A
- Authority
- CN
- China
- Prior art keywords
- target
- calibration
- region
- circuit breaker
- image
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/13—Edge detection
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/20—Analysis of motion
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Theoretical Computer Science (AREA)
- Multimedia (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a method and a device for measuring the opening and closing speed of a circuit breaker based on a linear array camera, wherein the method comprises the following steps: acquiring a multi-frame image of a target moving along with the opening and closing of the circuit breaker by using a linear array camera; respectively adopting an image processing method based on edge detection to each frame of image of the target to obtain the motion stroke of the target corresponding to each frame of image and obtain a relation curve of the motion stroke of the target and time; and calculating to obtain the opening and closing speed characteristic of the circuit breaker according to the relation curve of the motion stroke of the target and the time. The measuring method provided by the invention realizes indirect measurement of the opening and closing speed of the circuit breaker, the quantity of pixels for shooting images is small, and the image processing efficiency is improved; the one-dimensional pixel quantity is increased, and the measurement precision is improved; the invention only needs to set the target on the rotating shaft, does not need to replace the sensor for different objects, is less influenced by the environment of the equipment and can meet the requirement of on-line measurement.
Description
Technical Field
The invention belongs to the technical field of power system monitoring, and particularly relates to a method and a device for measuring the opening and closing speed of a circuit breaker based on a linear array camera.
Background
The circuit breaker is an important electrical device in a power plant, a transformer substation and a power transmission and transformation system, the opening and closing speed of the circuit breaker directly influences the opening and closing performance, and the excessive opening and closing speed can cause a circuit breaker movement mechanism to bear excessive mechanical stress and impact, so that the mechanical damage of structural parts is caused, the mechanical abrasion is increased, and the mechanical life is shortened; and too low branch, closing speed then can influence the arc extinguishing effect of circuit breaker, leads to the time extension of arcing, accelerates the electric wear of contact to reduce the life of circuit breaker, consequently, the accurate branch of measuring the circuit breaker, closing speed characteristic have important meaning to its safe and reliable's operation.
Usually, the moving contact and the static contact of the circuit breaker are both packaged in the arc extinguish chamber, and the motion characteristics of the circuit breaker cannot be directly measured, so that the circuit breaker opening and closing speed is usually measured by an indirect measuring method, namely, the speed of an operating mechanism connected with the moving contact is measured by a sensor to indirectly obtain the speed characteristics of the circuit breaker. The non-contact measurement method for obtaining the opening and closing speed characteristics of the circuit breaker has the advantages that the non-contact measurement method for obtaining the opening and closing speed characteristics of the circuit breaker by adopting the high-speed camera to shoot and then obtaining the motion track and the speed of the reference mark through an image processing technology is widely used because a sensor clamp does not need to be installed on a motion mechanism in a mechanical mode, voltage isolation does not need to be considered, the on-line measurement requirements can be met, and the like. The existing high-speed camera is an area-array camera, acquires two-dimensional motion image information of a motion mechanism, and has the disadvantages of large total pixel amount, large required hardware resource and long consumed time during image processing.
In order to solve the above problems, it is necessary to provide a method and a device for measuring the opening and closing speed of a circuit breaker based on a linear array camera, which are reasonable in design and effectively solve the above problems.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art and provides a method and a device for measuring the opening and closing speed of a circuit breaker based on a linear array camera.
The invention provides a method for measuring the opening and closing speed of a circuit breaker based on a linear array camera, wherein a target is arranged on a rotating shaft of the circuit breaker, and the linear array camera corresponds to the target; the measuring method comprises the following steps:
s1, acquiring multi-frame images of the target moving along with the opening and closing of the circuit breaker through the linear array camera;
s2, for each frame of image of the target, adopting an image processing method based on edge detection to obtain the movement journey of the target corresponding to each frame of image, and further obtaining the relation curve of the movement journey of the target and time;
and S3, calculating to obtain the opening and closing speed characteristic of the circuit breaker according to the relation curve of the motion stroke of the target and time.
Optionally, the S2 specifically includes: the target is provided with a calibration reference area and a calibration characteristic area which are arranged at intervals;
for each frame of image of the target, respectively adopting an image processing method based on edge detection to obtain the motion stroke of the target corresponding to each frame of image, comprising:
acquiring pixel abscissa coordinates of the calibration reference area and the calibration characteristic area in each frame of image based on an image processing method of edge detection;
and calculating the motion stroke of the target corresponding to the frame image according to the pixel abscissas of the calibration reference region and the calibration characteristic region and the size of the target.
Optionally, the width of the calibration reference area along the length direction of the target is a fixed value;
the width dimension of the first end of the calibration feature region along the length direction of the target is linearly increased or decreased towards the second end of the calibration feature region.
Optionally, the motion stroke of the target corresponding to the frame image is calculated according to the pixel abscissa of the calibration reference region and the calibration feature region and the size of the target, and specifically:
and calculating the motion stroke of the target corresponding to each frame image according to the pixel abscissa of the calibration reference region and the calibration characteristic region in each frame image, the width dimensions of the calibration reference region and the calibration characteristic region and the length dimension of the target.
Optionally, the grayscale jump region is respectively disposed at two sides of the calibration reference region and the calibration feature region, and a grayscale value of the grayscale jump region is different from grayscale values of the calibration reference region and the calibration feature region.
Optionally, the length of the target is calculated according to the following relation:
L＝θπr/180；
and L is the rotation distance of the surface of the rotating shaft, the rotation distance is equal to the length of the target, theta is the rotating angle of the rotating shaft, and r is the radius of the rotating shaft.
Optionally, the target has an upper boundary and a lower boundary, and the line camera corresponds to one of the upper boundary and the lower boundary of the target.
The invention provides a circuit breaker opening and closing speed measuring device based on a linear array camera, which comprises the linear array camera, a target and a processing module;
the target is arranged on a rotating shaft of the circuit breaker, and the linear array camera corresponds to the target;
the linear array camera is used for acquiring multi-frame images of the target moving along with the opening and closing of the circuit breaker;
the processing module is electrically connected with the linear array camera and is used for respectively adopting an image processing method based on edge detection to each frame of image of the target to obtain the motion stroke of the target corresponding to each frame of image and obtain a relation curve of the motion stroke of the target and time;
and the processing module is further used for calculating the opening and closing speed characteristic of the circuit breaker according to the relation curve of the motion stroke of the target and the time.
Optionally, the target is provided with a calibration reference area and a calibration feature area which are arranged at an interval relatively; wherein the content of the first and second substances,
the width dimension of the calibration reference area along the length direction of the target is a fixed value;
the width dimension of the first end of the calibration feature region along the length direction of the target is linearly increased or decreased towards the second end of the calibration feature region.
Optionally, the target is further provided with a gray level jump region, and the gray level jump regions are respectively arranged at two sides of the calibration reference region and the calibration feature region; the gray value of the gray level jump area is different from the gray values of the calibration reference area and the calibration characteristic area.
The invention discloses a circuit breaker opening and closing speed measuring method and device based on a linear array camera. The circuit breaker opening and closing speed is indirectly measured by utilizing the linear array camera, the target arranged on the rotating shaft and combining an image processing method of edge detection, the quantity of pixels for shooting images is small, and the image processing efficiency is improved; the one-dimensional pixel quantity is increased, and the measurement precision is improved; the invention only needs to set the target on the rotating shaft, does not need to replace the sensor for different objects, is less influenced by the environment of the equipment and can meet the requirement of on-line measurement.
Drawings
Fig. 1 is a schematic flow chart of a method for measuring the opening and closing speed of a circuit breaker based on a linear array camera according to an embodiment of the invention;
fig. 2 is a schematic structural diagram of a circuit breaker opening and closing speed measuring device based on a linear array camera according to another embodiment of the invention;
FIG. 3 is a schematic structural diagram of a target in another embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, an aspect of the present invention provides a method S100 for measuring a switching-on/off speed of a circuit breaker based on a linear array camera, as shown in fig. 2, a rotating shaft 111 of the circuit breaker 110 is provided with a target 130, a linear array camera 120 corresponds to the target 130, and a fixed contact 113 and a movable contact 114 are disposed in an arc extinguish chamber 112, so as to implement switching-on and switching-off of the circuit breaker 110. The arc extinguish chamber 112 is used for encapsulating the fixed contact 113 and the movable contact 114. The connecting rod 115 is connected with one end of the movable contact 114, the other end of the connecting rod 115, the crank arm 116 and the rotating shaft 111 jointly form an operating mechanism connected with the movable contact 114, and indirect measurement of the opening and closing speed of the circuit breaker 110 is achieved by measuring the speed characteristic of the operating mechanism. Furthermore, the arc extinguish chamber 112, the fixed contact 113, the movable contact 114 and the operating mechanism together form a circuit breaker 110 structure.
The measurement method S100 includes:
s110, acquiring multi-frame images of the target moving along with the opening and closing of the circuit breaker through the linear array camera.
Before acquiring a multi-frame image of a target moving along with the opening and closing of the circuit breaker through the linear array camera, the method further comprises the following steps: first, the angle through which the rotating shaft 111 rotates when the circuit breaker 110 is in the opening and closing motion is obtained according to the actual operation result of the circuit breaker 110.
Specifically, when the circuit breaker 110 is in the opening motion, the rotating shaft 111 rotates counterclockwise by θ ° under the driving force; during the closing movement of the circuit breaker 110, the rotating shaft 111 will rotate clockwise by θ °. θ is measured during actual operation of the circuit breaker 110, and θ represents the angle that the rotating shaft 111 rotates when the circuit breaker 110 is in the opening and closing motion.
Second, the length of the target 130 is calculated.
Specifically, the angle that pivot 111 rotated when circuit breaker 110 divides closing motion is theta, and the radius of pivot 111 is r, then in the motion process of circuit breaker 110 divide closing, pivot 111 surface rotation distance L:
L＝θπr/180； (1)
and L is the rotation distance of the surface of the rotating shaft, and the rotation distance is equal to the length of the target. That is, the length of the target 130 is the same as the surface rotation distance of the rotating shaft 111.
Calculating the surface rotation distance L of the rotating shaft 111 according to the formula (1), manufacturing a target 130 with the length L and the width W, arranging the target 130 on the surface of the rotating shaft 111 in a pasting or smearing mode, moving along with the rotating shaft 111, unfolding the target 130, and arranging the long edge of the target 130 along the rotation direction of the rotating shaft 111, wherein the planar graph of the target 130 is a rectangle as shown in FIG. 2, the length of the rectangle is set to be L, the width of the rectangle is set to be W, and the long edge of the target 130 is arranged along the rotation direction of the rotating shaft 111 during pasting. The width W is determined by the space left in the shaft direction of the rotating shaft 111.
A light source 140 is arranged between the target 130 and the line camera 120, and in this embodiment, the light source 140 is an LED lamp and is used for supplementing light to an image during shooting, so as to avoid difficulty in subsequent software identification caused by insufficient brightness when the exposure time of a single frame image is too short.
Illustratively, the target 130 has an upper boundary and a lower boundary, and the line camera 120 corresponds to one of the upper boundary and the lower boundary of the target 130.
Specifically, when the circuit breaker 110 performs the opening motion, the line camera 120 is directly opposite to the lower boundary of the target 130, so that when the opening motion is performed, the stroke of the first frame of image is 0, and during the opening motion, the multi-frame images of the target 130 from the lower boundary to the upper boundary are shot, that is, the first frame of opening image a, the nth frame of opening image B, and the last frame of opening image C are obtained through shooting. The captured image is a long and narrow strip, as shown in fig. 3, the resolution of the first frame image a of the gate-off is 4096 × 32, and the total number of pixels is greatly reduced compared with the image captured by the area array high-speed camera with the resolution of 1280 × 800. Meanwhile, the number of one-dimensional pixels is increased, and the measurement precision is improved.
When the circuit breaker 110 performs a closing motion, the line camera 120 is directed to an upper boundary of the target 130. Shooting a plurality of frame images from the upper boundary to the lower boundary of the target 130, namely shooting to obtain a first closing frame image, an nth closing frame image and a last closing frame image.
And S120, respectively adopting an image processing method based on edge detection to each frame of image of the target to obtain the motion stroke of the target corresponding to each frame of image, and obtaining a relation curve between the motion stroke of the target and time.
Illustratively, the target 130 is provided with a calibration reference region 130a and a calibration feature region 130b which are oppositely spaced apart. The width of the calibration reference region 130a along the length direction of the target 130 is a fixed value. The width dimension of the first end of the calibration feature region 130b along the length direction of the target 130 is linearly increased or decreased toward the second end thereof, that is, the width dimension of the first end of the calibration feature region 130b is different from the width dimension of the second end, and may be linearly decreased toward the second end or linearly increased toward the second end.
Specifically, as shown in fig. 3, in the present embodiment, the shape of the calibration reference area 130a is a fixed-width rectangle, and the width dimension on the target 130 is Wa, which is used as a reference amount during the movement of the target 130. The calibration feature region 130b is located at the right side of the calibration reference region 130a, and as the variation amount of the target 130 during the movement process, the gray value of the calibration feature region 130b is consistent with the gray value of the calibration reference region 130 a.
As shown in fig. 3, in the present embodiment, the width dimension of the calibration feature region 130b at the first end along the length direction of the target 130 increases linearly towards the second end thereof, that is, the calibration feature region 130b is in the shape of a right trapezoid, and the width dimension of the second end of the calibration feature region 130b is Wc, that is, the bottom dimension of the calibration feature region 130b on the target 130 is Wc. The first end width dimension of the calibration feature region 130b is Wb, that is, the upper and lower dimensions of the calibration feature region 130b on the target 130 are Wb. Referring to the constant width Wa of the calibration reference region 130a, the first end width Wb, the second end width Wc, and the length L of the target 130 of the calibration feature region 130b are combined to obtain the stroke of the target 130 corresponding to the single-frame image of the target 130.
As shown in fig. 3, the target 130 is further provided with a gray jump area 130c, and the gray jump areas 130c are respectively disposed at two sides of the calibration reference area 130a and the calibration feature area 130 b. The gray value of the gray transition region 130c is different from the gray values of the calibration reference region 130a and the calibration feature region 130 b. That is, the grayscale values of the calibration reference region 130a and the calibration feature region 130b may be greater than the grayscale value of the grayscale transition region 130c, and the grayscale values of the calibration reference region 130a and the calibration feature region 130b may also be less than the grayscale value of the grayscale transition region 130 c. That is, there is no specific requirement on the gray values of the calibration reference region 130a, the calibration feature region 130b, and the gray transition region 130c, as long as the absolute value of the gray value difference between the calibration reference region 130 and the gray transition region 130c is greater than the preset threshold. The gray level jump region 130c is used for forming a step gray level gradient with the calibration reference region 130a and the calibration feature region 130b, so as to obtain a clear edge profile and improve the accuracy of edge detection.
In step S110, the opening first frame image a and the opening last frame image C are respectively located at the lower bottom edge and the upper bottom edge of the target calibration reference region 130a and the calibration feature region 130b, and when the opening moves, the target 130 rotates counterclockwise by θ °, and the line camera 120 captures the opening first frame image to the opening last frame image. The first closing frame image and the last closing frame image are respectively located at the upper bottom edge and the lower bottom edge of the target calibration reference region 130a and the calibration characteristic region 130b, and during closing movement, the target 130 rotates clockwise by theta degrees, and the linear array camera 120 shoots the first closing frame image to the last closing frame image.
Illustratively, the obtaining, for each frame of image of the target, a motion stroke of the target corresponding to each frame of image by using an image processing method based on edge detection includes:
firstly, acquiring the pixel abscissa of the calibration reference area and the calibration characteristic area in each frame of image based on an edge detection image processing method.
Specifically, in this embodiment, taking the opening motion of the circuit breaker 110 as an example, after the line camera 120 sequentially obtains the first frame image a, the nth frame (n is 2,3,4,5 …) image B, and the last frame image C of the target 130, the images are subjected to related processing such as smoothing, filtering, denoising, edge enhancement, and the like, and then pixel abscissa of four positions of each image with a gray gradient step is extracted based on an edge detection technology. In the present embodiment, the left and right boundaries of the rectangle with equal width in the calibration reference region 130a, the right-angled boundary, and the oblique boundary of the right trapezoid in the calibration feature region 130b, and the like. That is, the four positions of each image gray gradient step are respectively located on the sides between the calibration reference region 130a and the calibration feature region 130b and the gray transition region 130cA border area. Four abscissas of the first frame image A are respectively marked as X 00 、X 01 、X 02 And X 03 Four abscissas of the nth frame image B are respectively marked as X (n-1)0 、X (n-1)1 、X (n-1)2 And X (n-1)3 。
During the closing movement of the circuit breaker 110, the first closing frame image, the nth closing frame image and the last closing frame image from the upper boundary to the lower boundary of the target 130 are shot, and after the images are subjected to relevant processing such as smoothing, filtering, denoising and edge enhancement, the pixel abscissa of four positions of each image with a gray gradient step is extracted based on an edge detection technology. The specific pixel abscissa obtaining process is consistent with the opening motion process of the breaker 110.
Secondly, according to the pixel abscissa of four positions of each image gray gradient step, the fixed width Wa of the calibration reference region 130a is referred to, and the movement stroke of the target corresponding to the frame image is calculated by combining the first end dimension Wb, the second end width dimension Wc and the length L of the target 130 of the calibration feature region 130 b.
Specifically, in this embodiment, taking the shape of the calibration reference region 130a as a fixed-width rectangle, the shape of the calibration feature region 130b as a right trapezoid, and taking the opening motion of the circuit breaker 110 as an example, based on the abscissa of the pixel in the image and the fixed width Wa of the calibration reference region 130a on the target 130, and combining the dimensional relationship of the first end dimension Wb, the second end width dimension Wc, and the length L of the target 130 of the calibration feature region 130b, the stroke of the first frame image a is recorded as Y 0 When the target 130 moves, the movement distance of the target 130 corresponding to each frame of image is calculated according to the following relation:
wherein, Y n-1 Motion run, X, of the target for the nth frame image (n-1)0 And X (n-1)1 Is the pixel abscissa, X, of the boundary of the calibration reference region of the nth frame image (n-1)2 And X (n-1)3 Pixel horizontal of the boundary of the calibration characteristic region of the nth frame imageThe coordinate, L is the length of the target, Wa is the dimension of the calibration reference region in the width direction of the target, Wc is the width dimension of a first end of the calibration feature region in the length direction of the target, Wb is the width dimension of a second end of the calibration feature region in the length direction of the target, and n is a positive integer.
In this embodiment, when the breaker 110 is opened, the movement stroke of the target 130 corresponding to each frame of image is calculated according to the above formula (2), and the specific process is as described above and will not be described in detail here.
The above formula (2) is the movement stroke of the target 130 corresponding to each image, which is obtained when the shape of the calibration reference region 130a is a constant width rectangle and the shape of the calibration feature region 130b is a right trapezoid. The calculation method is as follows: first, the abscissa of the pixel of the boundary of the calibration reference region 130a in the nth frame image is marked as X (n-1)0 And X (n-1)1 If the corresponding dimension is the fixed width Wa of the calibration reference region 130a, the abscissa of the pixel at the boundary of the calibration feature region 130b in the same frame image is X (n-1)2 And X (n-1)3 Then, when the feature region 130b is calibrated, the moving stroke of the target 130 is calculated according to the relationship between the geometric dimensions of the right trapezoid, the width calculated from the proportional relationship, the length L of the target, the dimension Wa of the calibration reference region in the width direction of the target, the width dimension Wc of the first end of the calibration feature region in the length direction of the target, and the width dimension Wb of the second end of the calibration feature region in the length direction of the target. If the shape of the calibration feature region 130b is other shapes, the same calculation method can be used to obtain the motion stroke formula of the target 130 corresponding to each frame of image.
In the present embodiment, the processor 150 identifies, processes, calculates, etc. the images captured by the line camera 120, and obtains the moving route of the target 130 in the images of multiple frames. In this embodiment, the processor 150 may adopt an image detection system, or may adopt another processor, and this embodiment is not particularly limited.
And S130, calculating to obtain the opening and closing speed characteristic of the circuit breaker according to the relation curve of the motion stroke of the target and time.
Specifically, the motion stroke of the target corresponding to each frame of image is obtained through calculation, and a curve graph of the stroke of each frame of image of the target 130 and time is drawn, so that a circuit breaker opening and closing motion stroke curve can be obtained. In this embodiment, a curve of the stroke of each frame of image of the target 130 and the time is drawn according to the above formula (2), so as to obtain a circuit breaker opening and closing motion stroke curve. And (3) performing derivation processing on the opening and closing motion stroke curve of the circuit breaker 110 to obtain the opening and closing speed characteristic of the circuit breaker 110. It should be noted that, during the switching on and off of the circuit breaker 110, the rotation angle θ of the rotating shaft 111 is small, and the movement speed of the target 130 is approximately equal to the switching on and off speed of the circuit breaker 110.
According to the circuit breaker opening and closing speed measuring method based on the linear array camera, the linear array camera and the target arranged on the rotating shaft are utilized, and an image processing method of edge detection is combined, so that the circuit breaker opening and closing speed is indirectly measured, the number of pixels for shooting images is small, and the image processing efficiency is improved; the one-dimensional pixel quantity is increased, and the measurement precision is improved; the invention only needs to set the target on the rotating shaft, does not need to replace the sensor for different objects, is less influenced by the environment of the equipment and can meet the requirement of on-line measurement.
As shown in fig. 2, another aspect of the present invention provides a circuit breaker opening and closing speed measuring device 100 based on a line camera, where the measuring device 100 includes a line camera 120, a target 130 and a processing module 150. As shown, a target 130 is disposed on the rotating shaft 111 of the circuit breaker 110, and the line camera 120 corresponds to the target 130. In the present embodiment, the target 130 is rectangular in shape.
As shown in fig. 2, the fixed contact 113 and the movable contact 114 are disposed in the arc extinguish chamber 112 for implementing closing and opening of the circuit breaker 110. The arc extinguish chamber 112 is used for encapsulating the fixed contact 113 and the movable contact 114. The connecting rod 115 is connected with one end of the moving contact 114, the other end of the connecting rod 115, the crank arm 116 and the rotating shaft 111 jointly form an operating mechanism connected with the moving contact 114, and indirect measurement of the opening and closing speed is achieved by measuring the speed characteristic of the operating mechanism. Further, the arc extinguish chamber 112, the fixed contact 113, the movable contact 114 and the operating mechanism together form the circuit breaker 110.
The target 130 is arranged on the rotating shaft 111 of the circuit breaker 110, and the line camera 120 corresponds to the target 130. The line camera 120 is used for acquiring multi-frame images of the target 130 moving with the opening and closing of the circuit breaker 110.
The processing module 150 is electrically connected to the line camera 120, and is configured to obtain, for each frame of image of the target 130, a motion stroke of the target 130 corresponding to each frame of image by using an image processing method based on edge detection, and obtain a relationship curve between the motion stroke of the target 130 and time. The processing module 150 is further configured to calculate a switching-on and switching-off speed characteristic of the circuit breaker 110 according to a relation curve between the movement stroke of the target 130 and time. In this embodiment, the processor 150 may adopt an image detection system, or may adopt another processor, and this embodiment is not particularly limited.
As shown, the target 130 is provided with a calibration reference region 130a and a calibration feature region 130b which are oppositely spaced. The width of the calibration reference region 130a along the length direction of the target 130 is a fixed value. The width dimension of the first end of the calibration feature region 130b along the length direction of the target 130 is linearly increased or decreased toward the second end thereof, that is, the width dimension of the first end of the calibration feature region 130b is different from the width dimension of the second end, and may be linearly decreased toward the second end or linearly increased toward the second end.
Specifically, as shown in fig. 3, in the present embodiment, the shape of the calibration reference area 130a is a fixed-width rectangle, and the width dimension on the target 130 is Wa, which is used as a reference amount during the movement of the target 130. As shown in fig. 3, the calibration feature region 130b is located at the right side of the calibration reference region 130a, and as the variation amount of the target 130 during the movement process, the gray value of the calibration feature region 130b is consistent with the gray value of the calibration reference region 130 a.
As shown in fig. 3, in the present embodiment, the width dimension of the calibration feature region 130b increases linearly from the first end to the second end along the length direction of the target 130. In the present embodiment, the calibration feature region 130b has a right trapezoid shape, and the second end width dimension of the calibration feature region 130b is Wc, that is, the bottom dimension of the calibration feature region 130b on the target 130 is Wc. The first end width dimension of the calibration feature region 130b is Wb, that is, the upper and lower dimensions of the calibration feature region 130b on the target 130 are Wb. The calibration feature region 130b may have other shapes, and the embodiment is not particularly limited.
Illustratively, the target 130 is further provided with a gray jump area 130c, and the gray jump areas 130c are respectively arranged at two sides of the calibration reference area 130a and the calibration feature area 130 b; the gray value of the gray transition region 130c is different from the gray values of the calibration reference region 130a and the calibration feature region 130 b. That is, the grayscale values of the calibration reference region 130a and the calibration feature region 130b may be greater than the grayscale value of the grayscale transition region 130c, and the grayscale values of the calibration reference region 130a and the calibration feature region 130b may also be less than the grayscale value of the grayscale transition region 130 c. That is, there is no specific requirement for the specific gray values of the calibration reference region 130a, the calibration feature region 130b, and the gray transition region 130c, as long as the absolute value of the gray value difference between the calibration reference region 130 and the gray transition region 130c is greater than the preset threshold.
The gray level jump region 130c is used for forming a step gray level gradient with the calibration reference region 130a and the calibration feature region 130b, so as to obtain a clear edge profile and improve the accuracy of edge detection.
Further preferably, a light source 140 is disposed between the target 130 and the line camera 120, in this embodiment, the light source 140 is an LED lamp, and is used for supplementing light to an image during shooting, so as to avoid difficulty in subsequent software identification due to insufficient brightness when the exposure time of a single frame image is too short.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A circuit breaker opening and closing speed measuring method based on a linear array camera is characterized in that a target is arranged on a rotating shaft of a circuit breaker, and the linear array camera corresponds to the target; the measuring method comprises the following steps:
s1, acquiring multi-frame images of the target moving along with the opening and closing of the circuit breaker through the linear array camera;
s2, for each frame of image of the target, adopting an image processing method based on edge detection to obtain the motion stroke of the target corresponding to each frame of image, and further obtaining a relation curve between the motion stroke of the target and time;
and S3, calculating to obtain the opening and closing speed characteristic of the circuit breaker according to the relation curve of the motion stroke of the target and time.
2. The measurement method according to claim 1, wherein S2 specifically is: the target is provided with a calibration reference area and a calibration characteristic area which are arranged at intervals;
for each frame of image of the target, respectively adopting an image processing method based on edge detection to obtain the motion stroke of the target corresponding to each frame of image, comprising:
acquiring pixel abscissa coordinates of the calibration reference area and the calibration feature area in each frame of image based on an edge detection image processing method;
and calculating the motion stroke of the target corresponding to the frame image according to the pixel abscissas of the calibration reference region and the calibration characteristic region and the size of the target.
3. The measurement method according to claim 2, wherein the width dimension of the calibration reference region along the length direction of the target is a fixed value;
the width dimension of the first end of the calibration feature region along the length direction of the target is linearly increased or decreased towards the second end of the calibration feature region.
4. The measurement method according to claim 3, wherein the motion stroke of the target corresponding to the frame image is calculated according to the pixel abscissa of the calibration reference region and the calibration feature region and the size of the target, specifically: and calculating the motion stroke of the target corresponding to each frame image according to the pixel abscissa of the calibration reference region and the calibration characteristic region in each frame image, the width dimensions of the calibration reference region and the calibration characteristic region and the length dimension of the target.
5. The measurement method according to claim 2, wherein the target is further provided with a gray jump region, the gray jump region is respectively arranged at two sides of the calibration reference region and the calibration feature region, and a gray value of the gray jump region is different from gray values of the calibration reference region and the calibration feature region.
6. The method of measurement according to claim 4, wherein the length of the target is calculated according to the following relation:
L＝θπr/180；
and L is the rotation distance of the surface of the rotating shaft, the rotation distance is equal to the length of the target, theta is the rotating angle of the rotating shaft, and r is the radius of the rotating shaft.
7. The measurement method according to any one of claims 1 to 6, wherein the target has an upper boundary and a lower boundary, and the line camera corresponds to one of the upper boundary and the lower boundary of the target.
8. A circuit breaker opening and closing speed measuring device based on a linear array camera is characterized by comprising the linear array camera, a target and a processing module;
the target is arranged on a rotating shaft of the circuit breaker, and the linear array camera corresponds to the target;
the linear array camera is used for acquiring multi-frame images of the target moving along with the opening and closing of the circuit breaker;
the processing module is electrically connected with the linear array camera and is used for respectively adopting an image processing method based on edge detection to each frame of image of the target to obtain the motion stroke of the target corresponding to each frame of image and obtain a relation curve of the motion stroke of the target and time;
and the processing module is further used for calculating the opening and closing speed characteristic of the circuit breaker according to the relation curve of the motion stroke of the target and the time.
9. The measuring device of claim 8, wherein the target is provided with a calibration reference region and a calibration feature region which are oppositely arranged at intervals; wherein the content of the first and second substances,
the width dimension of the calibration reference area along the length direction of the target is a fixed value;
the width dimension of the first end of the calibration feature region along the length direction of the target is linearly increased or decreased towards the second end of the calibration feature region.
10. The measuring device according to claim 9, wherein the target is further provided with a gray jump region, and the gray jump regions are respectively arranged at two sides of the calibration reference region and the calibration feature region; the gray value of the gray level jump area is different from the gray values of the calibration reference area and the calibration characteristic area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210487468.2A CN114859221A (en) | 2022-05-06 | 2022-05-06 | Circuit breaker opening and closing speed measuring method and device based on linear array camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210487468.2A CN114859221A (en) | 2022-05-06 | 2022-05-06 | Circuit breaker opening and closing speed measuring method and device based on linear array camera |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114859221A true CN114859221A (en) | 2022-08-05 |
Family
ID=82636356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210487468.2A Pending CN114859221A (en) | 2022-05-06 | 2022-05-06 | Circuit breaker opening and closing speed measuring method and device based on linear array camera |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114859221A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116625667A (en) * | 2023-07-25 | 2023-08-22 | 川开电气有限公司 | Online monitoring method for mechanical characteristics of 10kV vacuum circuit breaker |
| CN117471306A (en) * | 2023-12-28 | 2024-01-30 | 国网江西省电力有限公司电力科学研究院 | High-voltage circuit breaker over-travel measurement method and system based on improved optical flow field algorithm |
-
2022
- 2022-05-06 CN CN202210487468.2A patent/CN114859221A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116625667A (en) * | 2023-07-25 | 2023-08-22 | 川开电气有限公司 | Online monitoring method for mechanical characteristics of 10kV vacuum circuit breaker |
| CN116625667B (en) * | 2023-07-25 | 2023-11-14 | 川开电气有限公司 | Online monitoring method for mechanical characteristics of 10kV vacuum circuit breaker |
| CN117471306A (en) * | 2023-12-28 | 2024-01-30 | 国网江西省电力有限公司电力科学研究院 | High-voltage circuit breaker over-travel measurement method and system based on improved optical flow field algorithm |
| CN117471306B (en) * | 2023-12-28 | 2024-05-14 | 国网江西省电力有限公司电力科学研究院 | High-voltage circuit breaker over-travel measurement method and system based on improved optical flow field algorithm |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114859221A (en) | Circuit breaker opening and closing speed measuring method and device based on linear array camera | |
| US10288418B2 (en) | Information processing apparatus, information processing method, and storage medium | |
| Lin et al. | Vehicle speed detection from a single motion blurred image | |
| LU101668B1 (en) | Visual measurement method of levitation gap based on image processing | |
| CN103562673A (en) | Three-dimensional measuring apparatus | |
| WO2022027877A1 (en) | Method and apparatus for measuring movement speed of contact of vacuum switch | |
| US8873849B2 (en) | Image processing method, image display method, image processing apparatus and a non-transitory computer-readable recording medium | |
| CN113223050B (en) | Robot motion track real-time acquisition method based on Aruco code | |
| CN116008794A (en) | Device, system and method for testing switching-on and switching-off speed characteristics of high-voltage circuit breaker | |
| CN111126381A (en) | Insulator inclined positioning and identifying method based on R-DFPN algorithm | |
| CN109186947B (en) | A kind of electric appliance Three-Dimensional Dynamic characteristic Auto-Test System and method | |
| CN113983934A (en) | Copper-clad plate online high-speed dimension measurement method and device based on double-line-array camera | |
| CA2420069A1 (en) | Image processing apparatus and method, and image pickup apparatus | |
| CN116704416A (en) | Automatic extraction method and system for mechanical characteristics of high-voltage circuit breaker | |
| CN111145121A (en) | Confidence term filter target tracking method for strengthening multi-feature fusion | |
| CN114693741A (en) | Method for measuring motion characteristics of moving contact of circuit breaker based on deep learning | |
| CN115082538A (en) | System and method for three-dimensional reconstruction of surface of multi-view vision balance ring part based on line structure light projection | |
| CN115222722A (en) | Real-time crack detection method under complex speckle background | |
| Tang et al. | Fast and accuracy camera calibration based on Tsai two-step method | |
| CN106709885B (en) | A kind of sub-pixel distortion correction method and device | |
| CN117471306B (en) | High-voltage circuit breaker over-travel measurement method and system based on improved optical flow field algorithm | |
| CN113327232B (en) | Relay contact set contact surface alignment method, apparatus and computer storage medium | |
| Chen et al. | Polarized Relay Contacts Gap Measurement Based on Machine Vision Technology | |
| CN116416251B (en) | Method and related device for detecting quality of whole-core flame-retardant conveying belt based on image processing | |
| Zhao et al. | Computer Vision Based Vacuum Circuit-Breaker's Stroke Parameter Automatic Measurement |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |