A method and system for detecting the arc starting phenomenon in a power distribution cabinet

Abstract

The present invention relates to the technical field of safety detection of distribution cabinets, and particularly to a method and system for detecting the arc starting phenomenon in a distribution cabinet. The present invention acquires the image inside the distribution cabinet; when there is a long and strip-shaped high-brightness area in the image inside the cabinet, constructs end regions corresponding to the two end positions of the long and strip-shaped high-brightness area; divides the long and strip-shaped high-brightness area into multiple sub-regions, and determines whether the number of long and strip-shaped high-brightness targets contained in each sub-region is 1. If so, determines whether the brightness difference between the two end regions is greater than a preset brightness difference threshold. If it is greater, determines whether the brightness from one end to the other end is monotonically increasing or monotonically decreasing. If so, determines that an arc starting phenomenon has occurred inside the distribution cabinet. The present invention can accurately detect whether an abnormal arc starting phenomenon occurs inside the distribution cabinet.

Description

Technical Field

[0001] The present invention relates to the technical field of safety detection of power distribution cabinets, and particularly to a method and system for detecting the arc starting phenomenon of power distribution cabinets. Background Art

[0002] In modern power systems, power distribution cabinets are one of the key facilities in the power transmission and distribution process. There are usually many key components inside power distribution cabinets, such as busbars, terminal heads, etc. These components play an important role in power transmission and distribution. They work together to ensure that electricity can be safely, stably and efficiently delivered to each electrical equipment and area.

[0003] During the actual operation of substation buildings, due to climatic reasons, accidents caused by condensation often occur. This is mainly because of the need for cable inlets and outlets, and power distribution cabinet equipment is usually connected to the cable channel. In rainy seasons such as summer, due to reasons such as rainwater accumulation and poor ventilation, the humidity in the cable channel is usually high. A large amount of moisture accumulates in the cable channel, laying a hidden danger for subsequent problems. In cold seasons such as autumn and winter, the situation is also not optimistic. The temperature in the cable channel is higher than the outdoor ambient temperature. When the sealing condition of the cable holes is not ideal, hot and humid air enters the power distribution cabinet from the bottom. In the low-temperature environment inside the cabinet, the air will be supersaturated with water vapor, and some water vapor will condense and precipitate to cover the surface of the equipment. This condensed water vapor will reduce the insulation performance of equipment such as cable terminals and insulating sleeves. When the insulation performance drops to a certain level, it is easy to cause the arc starting phenomenon. For example, at the electrical connection points of the equipment, when the insulation is good, the current passes through stably. When condensation causes the insulation performance to deteriorate, the air is broken down to form an arc. This arc starting is likely to form abnormal phenomena such as flashover, which can not only directly cause equipment operation failures, but also induce the internal defects of the equipment to develop into operation failures in advance. In severe cases, the arc starting will cause insulation breakdown, and the strong current will cause the terminal to burn out, and even cause the cabinet to explode, posing a serious threat to the safe and stable operation of the substation building.

[0004] Due to the discontinuous occurrence characteristic of the arc starting phenomenon, it poses a great challenge to the conventional inspection methods. Most conventional inspection methods rely on manual periodic inspections, and the inspection cycle is usually in units of days, weeks or even months. During such a long time interval, the arc starting phenomenon may only appear in a short moment. If the starting time is not within the inspection period of the inspection personnel, it is very easy to be missed. Moreover, the environment inside the power distribution cabinet is relatively complex, with many electrical components and circuits. These devices will also generate various signals such as sounds and heats during normal operation, which are likely to interfere with the inspection personnel's judgment of the arc starting phenomenon, making it difficult for the inspection personnel to accurately identify the starting phenomenon from the complex background information even when on-site. Summary of the Invention

[0005] To this end, the technical problem to be solved by the present invention is to overcome the defect that it is difficult to detect the discontinuous arc starting phenomenon by the existing conventional inspection method, resulting in the difficulty in timely discovery and prevention of equipment failures.

[0006] To solve the above technical problem, the present invention provides a method for detecting the arc starting phenomenon in a power distribution cabinet, including the following steps:

[0007] Obtain the image inside the power distribution cabinet. When there is a long and strip-shaped high-brightness area in the cabinet image, construct the end regions corresponding to the two ends of the long and strip-shaped high-brightness area;

[0008] Divide the long and strip-shaped high-brightness area into multiple sub-regions, and judge whether the number of long and strip-shaped high-brightness targets contained in each sub-region is 1. If so, judge whether the brightness difference between the two end regions of the long and strip-shaped high-brightness area is greater than the preset brightness difference threshold. If it is greater, judge whether the brightness change from one end to the other end is monotonically increasing or decreasing. If so, it is determined that an arc starting phenomenon has occurred inside the power distribution cabinet.

[0009] Preferably, pass the cabinet image through a pre-trained object detection model to identify the box area where the highlight is located in the cabinet image;

[0010] Judge whether the aspect ratio of the box area where the highlight is located in the cabinet image is greater than the preset ratio. If it is greater, it is determined that the high-brightness area in the box area where the highlight is located is long and strip-shaped, and extract the high-brightness area to obtain the long and strip-shaped high-brightness area.

[0011] Preferably, after determining that an arc starting phenomenon has occurred inside the power distribution cabinet, judge whether there is a box area where the highlight is located with an aspect ratio within a preset range in the cabinet image after one time sequence. If there is, judge whether there is the long and strip-shaped high-brightness area based on which the arc starting phenomenon was determined in the previous time sequence. If there is, judge whether there is an intersection between the box area where the highlight is located and the long and strip-shaped high-brightness area based on which the arc starting phenomenon was determined in the previous time sequence. If there is an intersection, it is determined that a gas flow contact arc phenomenon has occurred inside the power distribution cabinet at this time sequence; wherein, the upper limit value of the preset range is less than the preset ratio;

[0012] After determining that a gas flow contact arc phenomenon has occurred inside the power distribution cabinet, judge whether there is a box area where the highlight is located with an aspect ratio within a preset range in the cabinet image after one time sequence. If there is, judge whether an arc starting phenomenon has occurred inside the power distribution cabinet at this time sequence. If not, it is determined that a strong gas flow arc blowing phenomenon has occurred inside the power distribution cabinet at this time sequence;

[0013] When the power distribution cabinet successively has an arc starting phenomenon, a gas flow contact arc phenomenon, and a strong gas flow arc blowing phenomenon in three consecutive adjacent time sequences, it is determined that a flashover phenomenon has occurred in the power distribution cabinet.

[0014] Preferably, an end region corresponding to each end is constructed based on the two end positions of the long strip-shaped highlighted region and the average width of the long strip-shaped highlighted region.

[0015] Preferably, the process of obtaining the average width of the long strip-shaped highlighted region includes:

[0016] According to the direction perpendicular to the long side of the minimum circumscribed rectangle of the long strip-shaped highlighted region, draw multiple line segments passing through the long strip-shaped highlighted region at a preset interval, and calculate the average value of the distances between the two points where each line segment intersects the boundary of the long strip-shaped highlighted region as the average width of the long strip-shaped highlighted region.

[0017] Preferably, the constructing of the end region corresponding to each end based on the two end positions of the long strip-shaped highlighted region and the average width of the long strip-shaped highlighted region includes:

[0018] Taking each end position as the center and the average width of the long strip-shaped highlighted region as the side length or diameter, construct a square region or a circular region as the end region corresponding to this end.

[0019] Preferably, if the angle between the connection line from one end of the long strip-shaped highlighted region to the other end and the horizontal direction is less than 45°, then the long strip-shaped highlighted region is vertically divided into multiple sub-regions;

[0020] If the angle between the connection line from one end of the long strip-shaped highlighted region to the other end and the horizontal direction is greater than 45°, then the long strip-shaped highlighted region is horizontally divided into multiple sub-regions;

[0021] If the angle between the connection line from one end of the long strip-shaped highlighted region to the other end and the horizontal direction is equal to 45°, then the long strip-shaped highlighted region is horizontally or vertically divided into multiple sub-regions.

[0022] Preferably, if the number of long strip-shaped highlighted targets contained in a sub-region of the long strip-shaped highlighted region is greater than 1, it is determined that the long strip-shaped highlighted region does not meet the conditions of the arc starting phenomenon, and no subsequent judgment is made, and the next long strip-shaped highlighted region is continued to be processed.

[0023] Preferably, the method for judging that the brightness from one end of the long strip-shaped highlighted region to the other end is monotonically increasing or decreasing includes:

[0024] Taking the average value of the brightness of each pixel point in each sub-region as the brightness of each sub-region;

[0025] According to the extension direction from one end of the long strip-shaped highlighted region to the other end, determine the brightness difference between the brightness of the subsequent sub-region and the brightness of the previous sub-region, and obtain a brightness difference; where is the number of sub-regions;

[0026] Statistically the number of luminance differences greater than 0 and less than 0 among the luminance differences. If the number of luminance differences greater than 0 among the luminance differences is greater than a preset luminance difference number judgment threshold, it is determined that the luminance from one end to the other end of the long strip-shaped high-brightness region is monotonically increasing; if the number of luminance differences less than 0 among the luminance differences is greater than a preset luminance difference number judgment threshold, it is determined that the luminance from one end to the other end of the long strip-shaped high-brightness region is monotonically decreasing.

[0027] The present invention also provides a detection system for the arc starting phenomenon of a power distribution cabinet, including:

[0028] An image acquisition module for acquiring an image inside the power distribution cabinet;

[0029] An end region construction module for constructing end regions corresponding to the two ends of the long strip-shaped high-brightness region when there is a long strip-shaped high-brightness region in the cabinet image;

[0030] A judgment module for dividing the long strip-shaped high-brightness region into multiple sub-regions, judging whether the number of long strip-shaped high-brightness targets included in each sub-region is 1. If so, judging whether the luminance difference between the two end regions of the long strip-shaped high-brightness region is greater than a preset luminance difference threshold. If it is greater, judging whether the luminance change from one end to the other end is monotonically increasing or monotonically decreasing. If so, it is determined that an arc starting phenomenon has occurred inside the power distribution cabinet.

[0031] The above technical solution of the present invention has the following beneficial effects compared with the prior art:

[0032] A method and system for detecting arc starting phenomena in a power distribution cabinet. By performing image detection on the images inside the power distribution cabinet, it can break through the time limit of conventional inspection tours and achieve continuous monitoring of the internal conditions of the power distribution cabinet. Since the environment inside the power distribution cabinet is usually dark, when an arc starting phenomenon occurs inside the power distribution cabinet, it will emit high brightness. According to factors such as the action of current and the flow of gas, it usually presents a long strip shape. The present invention utilizes this characteristic. When there is a long strip-shaped high-brightness area in the image inside the cabinet, it is initially judged that an arc starting phenomenon may occur. Considering that there may be other factors in the power distribution cabinet that cause high brightness, such as light leakage from the distribution box and reflection of equipment, the present invention further combines other characteristics of arc starting for accurate judgment. According to the characteristics of arc starting being curved but without helix, the long strip-shaped high-brightness area is divided into multiple sub-areas, and it is judged whether the number of long strip-shaped high-brightness targets contained in each sub-area is 1, so as to exclude some interferences. At the same time, according to the characteristic that the brightness of the arc starting phenomenon gradually decreases from the head to the tail, if the brightness difference between the two end areas is greater than the preset brightness difference threshold, and the brightness from one end to the other end is monotonically increasing or decreasing, by comprehensively considering various characteristics of the arc starting phenomenon, it can effectively exclude the high-brightness interference caused by other factors, achieve accurate identification of the arc starting phenomenon in the power distribution cabinet, break through the time limit of conventional inspection tours, be able to continuously monitor the internal conditions of the power distribution cabinet, and greatly improve the accuracy of judging the arc starting phenomenon in a complex environment. In addition, by accurately identifying the arc starting phenomenon in the power distribution cabinet, intervention can be carried out before the failure of the electrical equipment, effectively preventing equipment failures, reducing the complexity of failures, avoiding a large number of component damages and increased maintenance difficulties caused by the deterioration of failures, and thus reducing the maintenance cost.

[0033] In addition, when the air flow contacts the arc, the air flow will disturb the arc when it touches the burning arc, changing the gas flow field and energy distribution around the arc. On the cabinet image, this disturbance appears as a large area that intersects with the original long and narrow highlighted area of the arc. Therefore, after determining that an arc starting phenomenon has occurred in the power distribution cabinet, the present invention determines whether there is a large area in the cabinet image after one time sequence. The large area refers to an area where the aspect ratio of the length and width of the long and narrow highlighted area is within a set range, and there is the long and narrow highlighted area based on which the arc starting phenomenon was determined in the previous time sequence. If so, it is determined whether there is an intersection between the highlighted square area and the long and narrow highlighted area based on which the arc starting phenomenon was determined in the previous time sequence. If there is an intersection, it is determined that an air flow contact arc phenomenon has occurred in the power distribution cabinet at the current time sequence. When the air flow contact arc phenomenon occurs, the strong air flow will disperse the arc, causing the arc to extinguish. At this time, there is no new arc starting phenomenon in the power distribution cabinet, but the energy of the air flow still exists and will form a large area on the cabinet image. Therefore, after determining that an air flow contact arc phenomenon has occurred in the power distribution cabinet, the present invention determines whether the aspect ratio of the highlighted square area is within a preset range in the cabinet image after one time sequence, and no arc starting phenomenon has occurred in the power distribution cabinet. If so, it is determined that a strong air flow blowing arc phenomenon has occurred in the power distribution cabinet at the current time sequence. Arc starting is the initial stage of flashover. Subsequently, the air flow contacts the arc, changing the arc shape and energy distribution. Finally, the strong air flow blows the arc, causing the arc to extinguish or the arc energy to be greatly weakened. Therefore, by determining whether the power distribution cabinet sequentially experiences an arc starting phenomenon, an air flow contact arc phenomenon, and a strong air flow blowing arc phenomenon in three consecutive adjacent time sequences, the present invention determines whether a flashover phenomenon occurs in the power distribution cabinet, which can prevent the flashover phenomenon from threatening the safe and stable operation of the substation and ensure the safe and stable operation of the power distribution cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to make the content of the present invention easier to be clearly understood, the following further describes the present invention in detail according to specific embodiments of the present invention in conjunction with the drawings, where:

[0035] Figure 1 is a schematic flowchart of a method for detecting an arc starting phenomenon in a power distribution cabinet according to the present invention.

[0036] Figure 2 is a schematic diagram for extracting a long and narrow highlighted area.

[0037] Figure 3 is a schematic diagram for dividing the long and narrow highlighted area into multiple sub-regions along the horizontal direction. Figure 3 In (a) is a schematic diagram where the number of long and narrow highlighted targets in each sub-region is 1. Figure 3 In (b) is a schematic diagram where there are two or more long and narrow highlighted targets in the sub-region.

[0038] Figure 4 It is a schematic flow diagram for identifying flashover phenomena.

[0039] Figure 5 It is a schematic diagram of the highlighted square area identified in the case where the cabinet image contains a current image.

[0040] Figure 6 It is a schematic structural diagram of an arc initiation phenomenon detection device for a power distribution cabinet provided in an embodiment of the present application. Specific Embodiments

[0041] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the specific embodiments cited are not intended to limit the present invention.

[0042] In the power system, the arc initiation phenomenon often hides inside the power distribution cabinet. Due to its discontinuous occurrence characteristics, it is difficult to easily detect by conventional inspection methods. Therefore, in the first embodiment, a method for detecting the arc initiation phenomenon in a power distribution cabinet is proposed, which can accurately and timely detect whether an abnormal arc initiation occurs inside the power distribution cabinet.

[0043] Refer to Figure 1 As shown, the first embodiment of the present application provides a method for detecting the arc initiation phenomenon in a power distribution cabinet, including the following steps:

[0044] Step S1: Obtain the image inside the power distribution cabinet. When there is a long and strip-shaped highlighted area in the cabinet image, construct the end areas corresponding to the two ends of the long and strip-shaped highlighted area;

[0045] In this embodiment, specifically, the process of obtaining the long and strip-shaped highlighted area in the cabinet image is as follows:

[0046] Based on the cabinet image, detect the highlighted square area in the cabinet image; in the highlighted square area in the cabinet image, extract the long and strip-shaped highlighted area through an image segmentation model; the image segmentation model is any one of the U-Net model, the SegNet model, and the FCN model.

[0047] The highlighted area in the cabinet image is framed by a square. The formula for the highlighted square area identified in the cabinet image is:

[0048] ,

[0049] where box represents the highlighted square area in the cabinet image, bx represents the x-axis coordinate of the vertex of the highlighted square area, by represents the y-axis coordinate of the vertex of the highlighted square area, bw represents the width of the highlighted square area, and bh represents the height of the highlighted square area.

[0050] The method for detecting the highlighted square area in the cabinet image is any one of a pre-trained object detection model and a region detection algorithm;

[0051] The object detection model is any one of the YOLOv10_L object detection model, the Faster R-CNN model, and the Mask R-CNN model; the region detection algorithm is any one of the opencv region detection algorithm and the Canny edge detection algorithm.

[0052] In this embodiment, specifically, when the aspect ratio of the highlighted square area in the cabinet image is greater than a preset ratio, it is determined that the highlighted area in the highlighted square area is a long strip; wherein, the value range of the preset ratio is between 3 and 8, and other larger ratios can also be selected, which is not specifically limited in this application.

[0053] The long strip can be a straight long strip or a curved long strip, which is not specifically limited in this application. Since the arc ignition is usually a curved long strip, the above-mentioned long strip highlighted area is usually a curved long strip area.

[0054] As Figure 2 shown, Figure 2 is a schematic diagram for extracting the long strip highlighted area. Figure 2 The long strip highlighted area in is a curved long strip area.

[0055] In this embodiment, after detecting the highlighted square area in the cabinet image, the long strip highlighted area is extracted from the highlighted square area, which can accurately extract the long strip highlighted area in the image, effectively exclude the interference of other irrelevant information in the image, and only focus on the key part related to the abnormality. Compared with the traditional method of directly analyzing the entire image, this method greatly improves the accuracy of abnormality detection. Because in a complex cabinet environment, there are many factors that may affect the judgment, such as the reflection of the device itself and the normal indicator light on. And the method of this embodiment can accurately identify the highlighted part that truly represents the abnormality, reduce misjudgment, and thus provide a more reliable data basis for the analysis and processing of the arc ignition phenomenon, ensuring the accuracy and reliability of the arc ignition phenomenon recognition result.

[0056] In this embodiment, specifically, end regions corresponding to the two ends of the long strip highlighted area are constructed, including:

[0057] Taking each end as the center, the area composed of pixels with a range less than or equal to a preset distance is used as the end region corresponding to the end.

[0058] Among them, the positions of the two ends of the long strip highlighted area are , , The coordinates of , are , and the two end positions of the long rectangular highlighted area are the positions where the two endpoints of the long rectangular highlighted area are located.

[0059] In this embodiment, preferably, based on the two end positions of the long rectangular highlighted area and the average width of the long rectangular highlighted area, an end area corresponding to each end is constructed.

[0060] Optionally, taking each end position as the center and the average width of the long rectangular highlighted area as the side length, a square area is constructed as the end area corresponding to this end. The formula is:

[0061] ,

[0062] ,

[0063] where is the end area corresponding to the head end, is the end area corresponding to the tail end. The coordinates of the head end position are , The coordinates of the tail end position are , is the abscissa of the head end position , is the ordinate of the head end position , is the abscissa of the tail end position , is the ordinate of the tail end position , is the average width of the long rectangular highlighted area, is the function representation for constructing the rectangular area.

[0064] Optionally, taking each end position as the center and the average width of the long rectangular highlighted area as the diameter, a circular area is constructed as the end area corresponding to this end.

[0065] In this embodiment, based on the two end positions of the long rectangular highlighted area and the average width of the long rectangular highlighted area, an end area corresponding to each end is constructed, which can make the determined end area consistent with the overall width of the long rectangular highlighted area, so as to comprehensively reflect the overall brightness of each end area and will not affect the accuracy of the end area brightness due to the overly large range of the end area.

[0066] Specifically, in the present invention, the process of obtaining the average width of the long rectangular highlighted area includes:

[0067] In the direction perpendicular to the long side of the minimum circumscribed rectangle of the elongated highlighted area, draw a plurality of line segments penetrating the elongated highlighted area at a preset interval, and calculate the average value of the distances between the two points where each line segment intersects the boundary of the elongated highlighted area as the average width of the elongated highlighted area.

[0068] Optionally, in the direction perpendicular to the major semi-axis of the minimum circumscribed ellipse of the elongated highlighted area, draw a plurality of line segments penetrating the elongated highlighted area at a preset interval, and calculate the average value of the distances between the two points where each line segment intersects the boundary of the elongated highlighted area as the average width of the elongated highlighted area.

[0069] Optionally, along the extension direction of the elongated highlighted area from one end to the other end, divide the elongated highlighted area into highlight segments, and take the average value of the widths of the highlight segments as the average width of the elongated highlighted area. The formula is: ,

[0070] In the formula, is the average width of the elongated highlighted area, is the average value function, is the width of the th highlight segment, ;

[0071] Among them, there are multiple ways to determine the width of each highlight segment, as follows:

[0072] For each highlight segment, arbitrarily select a position inside it, and starting from the selected position, along the extension direction of the elongated highlighted area from one end to the other end, measure the distance from the selected position to one side boundary of the current highlight segment as the width of the current highlight segment.

[0073] For each highlight segment, determine the middle position inside it, and starting from the middle position, along the extension direction of the elongated highlighted area from one end to the other end, measure the distance from the middle position to one side boundary of the current highlight segment as the width of the current highlight segment.

[0074] For each highlight segment, arbitrarily select multiple positions inside it, and starting from each selected position, along the extension direction of the elongated highlighted area from one end to the other end, calculate the average value of the distances from each position to one side boundary of the current highlight segment as the width of the current highlight segment.

[0075] Step S2: Divide the long strip-shaped highlighted area into multiple sub-areas, and determine whether the number of long strip-shaped highlighted targets contained in each sub-area is 1. If so, determine whether the brightness difference between the two end areas of the long strip-shaped highlighted area is greater than the preset brightness difference threshold. If it is greater, determine whether the brightness change from one end to the other end is monotonically increasing or decreasing. If so, it is determined that an arc starting phenomenon has occurred in the power distribution cabinet.

[0076] In this embodiment, specifically, according to the extension direction from one end to the other end, determine the division direction, and divide the long strip-shaped highlighted area into multiple sub-areas;

[0077] The extension direction from one end to the other end is, according to the bending contour of the long strip-shaped highlighted area, starting from the starting end, following the trend of the curve throughout the whole process until reaching the other end. For the convenience of calculation, the extension direction from one end to the other end can also be the straight connection direction from one end to the other end.

[0078] If the angle between the connection line from one end to the other end of the long strip-shaped highlighted area and the horizontal direction is less than 45°, then divide the long strip-shaped highlighted area vertically into multiple sub-areas;

[0079] If the angle between the connection line from one end to the other end of the long strip-shaped highlighted area and the horizontal direction is greater than 45°, then divide the long strip-shaped highlighted area horizontally into multiple sub-areas;

[0080] If the angle between the connection line from one end to the other end of the long strip-shaped highlighted area and the horizontal direction is equal to 45°, then divide the long strip-shaped highlighted area horizontally or vertically into multiple sub-areas.

[0081] Among them, the angle between the straight connection direction from one end to the other end of the long strip-shaped highlighted area and the horizontal direction can be represented by the tilt angle The tangent value formula of the tilt angle is:

[0082] ,

[0083] where is the tilt angle, is the tangent value of the tilt angle .

[0084] If the angle between the straight connection direction from one end to the other end of the long strip-shaped highlighted area and the horizontal direction is less than 45°, that is , it shows that the overall long and narrow highlighted area extends horizontally. Therefore, the division direction is set to be vertical to divide the long and narrow highlighted area into multiple sub-regions along its own length direction. Similarly, if the angle between the straight-line connection direction from one end to the other end of the long and narrow highlighted area and the horizontal direction is greater than 45°, that is or , it shows that the overall long and narrow highlighted area extends vertically. Therefore, the division direction is set to be horizontal.

[0085] Using different division methods for long and narrow highlighted areas at different angles can divide the long and narrow highlighted area into parts, enabling the divided sub-regions to better fit the actual shape of the arc. In this way, when analyzing the brightness distribution, the monotonous brightness change from one end to the other end and the brightness of the end regions can be captured more accurately, and there will be no detection loopholes due to the diversity of the arc shape, ensuring the accurate determination of the arc starting phenomenon in the power distribution cabinet under various complex conditions.

[0086] Such as Figure 3 shown Figure 3 is a schematic diagram of dividing the long and narrow highlighted area into multiple sub-regions along the horizontal direction.

[0087] In this application, the long and narrow highlighted area can be evenly divided into multiple sub-regions, or the image inside the cabinet can be divided into multiple sub-regions along the extension direction from one end to the other end. Each sub-region contains the long and narrow highlighted area, so as to divide the long and narrow highlighted area into multiple parts. It can also divide the long and narrow highlighted area into multiple sub-regions with unequal areas. This application does not specifically limit.

[0088] Figure 3 In (a) of Figure 3 is a schematic diagram where the number of long and narrow highlighted targets in each sub-region is 1. Figure 3 In (b) of

[0089] is a schematic diagram where there are two or more long and narrow highlighted targets in the sub-region. When the long and narrow highlighted area is spiral, there will be two or more long and narrow highlighted targets in the sub-region. In this case, it indicates that the long and narrow highlighted area is not the highlight caused by the arc starting phenomenon, and it may be the highlight caused by other reasons, such as light leakage in the distribution box. Since the characteristic of the arc starting phenomenon is curved but not spiral, when the number of long and narrow highlighted targets contained in each sub-region is 1, it indicates that the characteristics of the starting phenomenon are met, which can exclude some interferences and more accurately judge whether an arc starting phenomenon has occurred in the power distribution cabinet.

[0089] Since the arc starting phenomenon usually has a greater brightness at the starting head and a smaller brightness at the starting tail, when determining whether the suspected arc starting area is actually an arc starting area, it is necessary to detect whether the brightness difference between the two end areas of the suspected arc starting area is greater than the preset brightness difference threshold. If it is greater, it means that the suspected arc starting area meets the condition of having a large brightness difference between the arc starting head and the arc starting tail.

[0090] In this embodiment, specifically, the brightness of each end area is any one of the average value of the brightnesses of each pixel in the end area, the brightness of the pixel at the middle position within the end area, and the brightness of any pixel in the end area. Those skilled in the art can flexibly select the method for determining the brightness of the two end areas.

[0091] For each end area, the average value of the brightnesses of all pixels within the area can be calculated, and the average value of all pixel brightnesses is determined as the brightness corresponding to the end area. The average brightness value can more accurately and comprehensively reflect the overall brightness situation of the end area.

[0092] The formula for calculating the average value of the brightnesses of each pixel in the two end areas is:

[0093] ,

[0094] ,

[0095] where, is the average value of the brightness of the end area corresponding to the head end , is the average value of the brightness of the end area corresponding to the tail end , is the number of pixel points in the end area corresponding to the head end, is the number of pixel points in the end area corresponding to the tail end, is the pixel point index in the end area corresponding to the head end, is the pixel point index in the end area corresponding to the tail end, is the brightness of, is the brightness of.

[0096] Since the arc starting phenomenon usually shows a gradually decreasing brightness from the starting head to the ending tail of the arc, when determining whether the arc starting phenomenon occurs, it is also necessary to detect whether the brightness from one end to the other end is monotonically increasing or decreasing. If it meets the condition, it means that the elongated high-brightness region satisfies the condition of gradually decreasing brightness from the starting head to the ending tail of the arc. Among them, if the brightness of the elongated high-brightness region gradually decreases from one end to the other end, it means that the starting end is the starting head of the arc and the ending end is the ending tail of the arc; if the brightness of the elongated high-brightness region gradually increases from one end to the other end, it means that the starting end is the ending tail of the arc and the ending end is the starting head of the arc.

[0097] In this embodiment, specifically, determining whether the brightness from one end to the other end of the elongated high-brightness region is monotonically increasing or decreasing includes:

[0098] Construct a brightness profile line that can extend from one end to the other end of the elongated high-brightness region, uniformly sample pixel points along the brightness profile line. If the brightness of all sampled pixel points is monotonically increasing or decreasing, then the brightness from one end to the other end of the elongated high-brightness region is monotonically increasing or decreasing.

[0099] Among them, the brightness profile line can be any one of a straight line, a broken line, and a curve.

[0100] Optionally, the method for determining whether the brightness from one end to the other end of the elongated high-brightness region is monotonically increasing or decreasing is:

[0101] Take the average value of the brightness of each pixel point in each sub-region as the brightness of each sub-region. The formula is:

[0102] ,

[0103] Among them, is the average value of the brightness of each pixel point in the th sub-region, , is the number of pixel points in the th sub-region, is the pixel point index in the th sub-region, is 's brightness.

[0104] According to the extension direction from one end to the other end, compare the brightness of adjacent sub-regions in sequence;

[0105] If the brightness of the latter sub-region is always greater than that of the former sub-region, it is determined that the brightness from one end to the other end of the long strip-shaped highlight region is monotonically increasing; if the average brightness of the latter sub-region is always less than that of the former sub-region, it is determined that the brightness from one end to the other end of the long strip-shaped highlight region is monotonically decreasing.

[0106] To more accurately detect whether the brightness of the long strip-shaped highlight region is gradually decreasing or increasing, the number of sub-region divisions can be selected as integers such as 4, 5, 6, 7, 8, 9, 10, etc., but the number of divisions should not be too large to avoid increasing the computational complexity and improving the operation efficiency and the efficiency of anomaly recognition.

[0107] Preferably, the method for determining whether the brightness from one end to the other end of the long strip-shaped highlight region is monotonically increasing or monotonically decreasing is as follows:

[0108] Take the average brightness of each pixel point in each sub-region as the brightness of each sub-region;

[0109] According to the extension direction from one end to the other end, determine the brightness difference between the brightness of the latter sub-region and the brightness of the former sub-region, and obtain brightness differences;

[0110] For example, the long strip-shaped highlight region is divided into 4 sub-regions, namely , there is a brightness difference corresponding to the second sub-region and the first sub-region, a brightness difference corresponding to the third sub-region and the second sub-region, and a brightness difference corresponding to the fourth sub-region and the third sub-region, and a total of 3 brightness differences are obtained.

[0111] In this embodiment, the brightness difference between the brightness of the latter sub-region and the brightness of the former sub-region is: the difference obtained by subtracting the brightness of the former sub-region from the brightness of the latter sub-region.

[0112] Count the number of those greater than 0 and less than 0 among the

[0113] ,

[0114] ,

[0115] where, is the number of those greater than 0 among the is the number of those less than 0 among the is the sub-region index, is the number of sub-regions, is the brightness of the is the The brightness of the sub-regions.

[0116] Statistical the number of brightness differences greater than 0 and less than 0 among the if the number of brightness differences greater than 0 among the is greater than a preset brightness difference number judgment threshold, it is determined that the brightness from one end to the other end of the long strip-shaped high-brightness region is monotonically increasing; if

[0117] For example: The long strip-shaped high-brightness region is divided into 4 sub-regions, and the respective brightness values corresponding to the first sub-region to the fourth sub-region are 15, 12, 20, and 25. The three brightness differences are -3, 8, and 5. Among them, the number of brightness differences greater than 0 is 2, and the number of brightness differences less than 0 is 1. If the set brightness difference number judgment threshold is 1.8, and the number of brightness differences greater than 0 is greater than 1.8, it is determined that the brightness from one end to the other end of the long strip-shaped high-brightness region is monotonically increasing.

[0118] In practical applications, since the brightness of the arcing image captured in the cabinet may be uneven, and during the arcing phenomenon, the overall brightness of the arcing light gradually increases or decreases, but there may be a situation of local brightness flickering. For example, the overall arcing shows a decreasing trend in brightness, but due to the instability of the arcing phenomenon at two adjacent ends, the brightness of the latter region is higher than that of the previous region, not meeting the decreasing trend. In this case, the overall trend should be judged as a whole. In this embodiment, when the number of brightness differences greater than 0 among the and the number of brightness differences less than 0 among the

[0119] In this embodiment, optionally, if there is only one long strip-shaped high-brightness region in the cabinet image, end regions corresponding to the two ends of the long strip-shaped high-brightness region are constructed;

[0120] The long strip-shaped high-brightness region is divided into multiple sub-regions, and it is judged whether the number of long strip-shaped high-brightness targets included in each sub-region is 1. If so, it is judged whether the brightness difference between the two end regions is greater than a preset brightness difference threshold. If it is greater, it is judged whether the brightness from one end to the other end is monotonically increasing or decreasing. If so, it is determined that an arcing phenomenon has occurred in the power distribution cabinet.

[0121] Because there may be various factors in the power distribution cabinet that cause highlights in the image. For example, the normal indicator lights being on, the reflection on the surface of the equipment, etc. may all form highlight areas, and these situations do not belong to the arcing phenomenon. Only when the highlights in the image are completely caused by the arcing phenomenon and there is no mixing of highlight images caused by other reasons, can it be accurately determined that arcing has indeed occurred in the power distribution cabinet. Therefore, taking the premise that there is only one highlight in the image inside the cabinet can effectively avoid misjudgment of the arcing phenomenon due to interference from other irrelevant highlight images.

[0122] As Figure 4 shown, Figure 4 is a schematic flow diagram for the identification of flashover phenomenon.

[0123] As Figure 5 shown, Figure 5 is a schematic diagram of the rectangular area where the highlight is identified in the case of the image inside the cabinet containing the arcing phenomenon.

[0124] In this embodiment, specifically, step S31: After determining that arcing has occurred in the power distribution cabinet, judge whether the aspect ratio of the rectangular area where the highlight is located in the image inside the cabinet after one time sequence is within the range of 0.7 to 1.3, and there is a long strip highlight area based on which the arcing phenomenon was determined in the previous time sequence. If so, judge whether there is an intersection between the rectangular area where the highlight is located and the long strip highlight area based on which the arcing phenomenon was determined in the previous time sequence. If there is an intersection, it is determined that a gas flow contact arcing phenomenon has occurred in the power distribution cabinet at the current time sequence;

[0125] When the gas flow contacts the burning arc, the gas flow will disturb the arc, changing the gas flow field and energy distribution around the arc. In the image inside the cabinet, this disturbance is manifested as a new highlight area, and the aspect ratio of the rectangular area where the highlight area is located is within the range of 0.7 to 1.3, intersecting with the long strip highlight area of the original arc. This is because the gas flow brings a new energy source or changes the material distribution in the original arc area, causing highlight features to appear in the new area and interacting with the original arc area. Therefore, when such image features appear, it can be determined that a gas flow contact arcing phenomenon has occurred in the power distribution cabinet.

[0126] Step S32: After determining that a gas flow contact arcing phenomenon has occurred in the power distribution cabinet, judge whether the aspect ratio of the rectangular area where the highlight is located in the image inside the cabinet after one time sequence is within the preset range and there is no arcing phenomenon in the power distribution cabinet. If so, it is determined that a strong gas flow arc blowing phenomenon has occurred in the power distribution cabinet at the current time sequence;

[0127] When the air flow strongly blows the arc, the strong air flow will disperse the arc, causing the arc to extinguish. At this time, there is no new arc starting phenomenon in the power distribution cabinet. However, the energy of the air flow still exists and will form a high-brightness area on the image inside the cabinet, and the aspect ratio of the length and width of the square area where the high-brightness area is located is within a preset range. This is because the air flow may carry substances heated by the arc or the air flow itself interacts with other substances inside the power distribution cabinet to produce a light-emitting phenomenon. Therefore, the image feature of a high-brightness area with a specific shape appearing in the case of no arc starting can determine that a strong air flow blowing arc phenomenon has occurred inside the power distribution cabinet.

[0128] Step S33: When in three consecutive adjacent time sequences, the power distribution cabinet successively experiences an arc starting phenomenon, an air flow contacting the arc phenomenon, and a strong air flow blowing arc phenomenon, it is determined that a flashover phenomenon has occurred in the power distribution cabinet.

[0129] Flashover is a gas discharge phenomenon along the insulation surface, usually accompanied by a series of complex physical processes. Arc starting is the initial stage of flashover. Subsequently, the air flow contacts the arc, causing changes in the arc shape and energy distribution. Finally, the strong air flow blows the arc, resulting in the arc extinguishing or the arc energy being greatly weakened. The sequential occurrence of this series of phenomena reflects the process of energy generation, transfer, and dissipation during flashover. Therefore, when these three phenomena are monitored to occur in sequence, it can be determined that a flashover phenomenon has occurred in the power distribution cabinet.

[0130] Among them, the pre-trained high-brightness area detection model is used to detect the square area where the high-brightness is located in the image. The above large area is an area where the maximum circumscribed ellipse of the long strip-shaped high-brightness area is close to a circle, that is, the absolute value of the difference between the major axis and the minor axis lengths of the maximum circumscribed ellipse of the long strip-shaped high-brightness area is less than a preset first length threshold, and the ratio of the area of the long strip-shaped high-brightness area to the area of its maximum circumscribed ellipse is greater than 0.7; or the large area is an area where the maximum circumscribed rectangle of the long strip-shaped high-brightness area is close to a square, that is, the absolute value of the difference between the length and the width of the maximum circumscribed rectangle of the long strip-shaped high-brightness area is less than a preset second length threshold, and the ratio of the area of the long strip-shaped high-brightness area to the area of the maximum circumscribed rectangle is greater than 0.7.

[0131] Among them, in three consecutive adjacent time sequences, the previous time sequence and the adjacent next time sequence are two time sequences within a preset time duration, that is, the interval between two adjacent time sequences is within the preset time duration. The preset time duration can be any time duration from 1 second to 5 seconds. Those skilled in the art can set the interval between two adjacent time sequences according to the specific occurrence duration of flashover. By judging whether the three characteristics of an arc starting phenomenon, an air flow contacting the arc phenomenon, and a strong air flow blowing arc phenomenon have successively occurred inside the power distribution cabinet in three adjacent time sequences, it can be accurately determined whether flashover has occurred.

[0132] In the first embodiment, various different types of abnormal situations can be detected based on the different presentations of the highlighted areas in the cabinet image, and prompt information can be sent to the maintenance personnel in a timely manner according to the situation.

[0133] In this embodiment, it further includes: when an arc starting phenomenon occurs in the power distribution cabinet, an abnormal prompt message is sent to the user-side device, and the abnormal prompt message is used to indicate the abnormal situation of the arc starting in the power distribution cabinet.

[0134] In practical applications, the early warning of power distribution cabinet failures usually becomes known to maintenance personnel only after users report that electrical equipment has failed or circuit components report errors. At this time, since the components have already failed, the repair is relatively complex and the repair cost is relatively high. In addition, the impact on user power consumption is also relatively large.

[0135] The present invention overcomes the defect that it is difficult to detect the discontinuous arc starting phenomenon by the existing conventional inspection methods, resulting in the difficulty in timely discovering and preventing equipment failures. By visually identifying the arc starting phenomenon, potential hazards in the power distribution cabinet can be discovered in a timely manner. Before the equipment fails, abnormalities can be quickly detected, better avoiding further failures of the equipment, reducing the repair cost as early as possible, and reducing the impact on user power consumption.

[0136] Embodiment 2 of the present application provides a detection system for the arc starting phenomenon in a power distribution cabinet, including:

[0137] An image acquisition module, configured to acquire an image inside the power distribution cabinet;

[0138] An end region construction module, configured to construct end regions corresponding to the two ends of a long strip-shaped highlighted region when there is a long strip-shaped highlighted region in the cabinet image;

[0139] A judgment module, configured to divide the long strip-shaped highlighted region into multiple sub-regions, judge whether the number of long strip-shaped highlighted targets included in each sub-region is 1, if so, judge whether the brightness difference between the two end regions of the long strip-shaped highlighted region is greater than a preset brightness difference threshold, and if greater, judge whether the brightness change from one end to the other end is monotonically increasing or decreasing. If so, it is determined that an arc starting phenomenon has occurred in the power distribution cabinet.

[0140] In this embodiment, specifically, the image acquisition module can be a binocular camera, a monocular camera or other types of cameras. The cabinet image is captured by installing a camera inside the power distribution cabinet. The camera can be selected to be installed inside the power distribution cabinet by magnetic attraction, or can be connected inside the power distribution cabinet by bolt connection, clamping or other connection methods; the number of cameras can be single or multiple, and cameras are installed at multiple positions respectively to capture images inside the power distribution cabinet from different angles. The present application does not specifically limit this.

[0141] Reference Figure 6 In the third embodiment of the present application, a detection device for the arc starting phenomenon of a power distribution cabinet is further provided, including: a processor, a memory, a communication bus, and a communication interface;

[0142] The memory is used to store a computer program, and the processor is used to implement the steps of the above-mentioned method for detecting the arc starting phenomenon of a power distribution cabinet when executing the computer program.

[0143] In the fourth embodiment of the present invention, a computer-readable storage medium is provided. A computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the above-mentioned method for detecting the arc starting phenomenon of a power distribution cabinet are implemented.

[0144] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0145] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram can be implemented by computer program instructions, and the combination of the flows and / or blocks in the flowchart and / or block diagram can also be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in one process Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0146] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including instruction means, and the instruction means implements the functions specified in one process Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0147] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus, so that a series of operation steps are performed on the computer or other programmable apparatus to produce a computer-implemented process, and thus the instructions executed on the computer or other programmable apparatus provide steps for implementing the functions specified in one process or a plurality of processes and / or blocks Figure 1 one process or a plurality of processes and / or blocks Figure 1 steps for implementing the functions specified in one block or a plurality of blocks.

[0148] Obviously, the above embodiments are only examples for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the present invention.

Claims

1. A method for detecting the arc starting phenomenon of a power distribution cabinet, characterized in that, Including the following steps: Obtain the image inside the power distribution cabinet. When there is a long and strip-shaped high-brightness area in the image inside the cabinet, construct end regions corresponding to the two ends of the long and strip-shaped high-brightness area; Divide the long and strip-shaped high-brightness area into multiple sub-regions. If the angle between the line connecting one end of the long and strip-shaped high-brightness area to the other end and the horizontal direction is less than 45°, then vertically divide the long and strip-shaped high-brightness area into multiple sub-regions; If the angle between the line connecting one end of the long and strip-shaped high-brightness area to the other end and the horizontal direction is greater than 45°, then horizontally divide the long and strip-shaped high-brightness area into multiple sub-regions; If the angle between the line connecting one end of the long and strip-shaped high-brightness area to the other end and the horizontal direction is equal to 45°, then horizontally or vertically divide the long and strip-shaped high-brightness area into multiple sub-regions; Judge whether the number of long and strip-shaped high-brightness targets contained in each sub-region is 1. If so, then judge whether the brightness difference between the two end regions of the long and strip-shaped high-brightness area is greater than the preset brightness difference threshold. If it is greater, then judge whether the brightness change from one end to the other end is monotonically increasing or decreasing. If so, it is determined that an arc starting phenomenon has occurred inside the power distribution cabinet.

2. The arc starting phenomenon detection method for a power distribution cabinet according to claim 1, wherein Pass the image inside the cabinet through a pre-trained object detection model to identify the rectangular area where the highlight is located in the image inside the cabinet; Judge whether the aspect ratio of the rectangular area where the highlight is located in the image inside the cabinet is greater than the preset ratio. If it is greater, then it is determined that the high-brightness area in the rectangular area where the highlight is located is long and strip-shaped, and extract the high-brightness area to obtain the long and strip-shaped high-brightness area.

3. A method for detecting the arc starting phenomenon of a power distribution cabinet according to claim 2, characterized in that, After determining that an arc starting phenomenon has occurred inside the power distribution cabinet, judge whether there is a rectangular area where the highlight is located with an aspect ratio within the preset range in the image inside the cabinet after an interval of one time sequence. If there is, then judge whether there is the long and strip-shaped high-brightness area based on which the arc starting phenomenon was determined in the previous time sequence. If there is, then judge whether there is an intersection between the rectangular area where the highlight is located and the long and strip-shaped high-brightness area based on which the arc starting phenomenon was determined in the previous time sequence. If there is an intersection, then it is determined that a gas flow contact arc phenomenon has occurred inside the power distribution cabinet at this time sequence; where the upper limit value of the preset range is less than the preset ratio; After determining that a gas flow contact arc phenomenon has occurred inside the power distribution cabinet, judge whether there is a rectangular area where the highlight is located with an aspect ratio within the preset range in the image inside the cabinet after an interval of one time sequence. If there is, then judge whether an arc starting phenomenon has occurred inside the power distribution cabinet at this time sequence. If not, then it is determined that a strong gas flow blowing arc phenomenon has occurred inside the power distribution cabinet at this time sequence; When an arc starting phenomenon, a gas flow contact arc phenomenon, and a strong gas flow blowing arc phenomenon occur in sequence inside the power distribution cabinet for three consecutive adjacent time sequences, it is determined that a flashover phenomenon has occurred in the power distribution cabinet.

4. A method for detecting the arc starting phenomenon of a power distribution cabinet according to claim 1, characterized in that, Based on the two end positions of the long and strip-shaped high-brightness area and the average width of the long and strip-shaped high-brightness area, construct the end region corresponding to each end.

5. A method for detecting the arc starting phenomenon of a power distribution cabinet according to claim 4, characterized in that, The process of obtaining the average width of the long and strip-shaped high-brightness area includes: According to the direction perpendicular to the long side of the minimum circumscribed rectangle of the long and strip-shaped high-brightness area, draw multiple line segments passing through the long and strip-shaped high-brightness area at a preset interval, and calculate the average value of the distances between the two intersection points of each line segment and the boundary of the long and strip-shaped high-brightness area as the average width of the long and strip-shaped high-brightness area.

6. A method for detecting the arc starting phenomenon of a power distribution cabinet according to claim 5, characterized in that, Constructing an end region corresponding to each end based on the two end positions of the strip-shaped highlight region and the average width of the strip-shaped highlight region, including: Taking each end position as the center and the average width of the strip-shaped highlight region as the side length or diameter, constructing a square region or a circular region as the end region corresponding to the end.

7. A method for detecting the arc starting phenomenon of a power distribution cabinet according to claim 1, characterized in that, If the number of strip-shaped highlight targets contained in a sub-region of the strip-shaped highlight region is greater than 1, it is determined that the strip-shaped highlight region does not meet the conditions of the arc starting phenomenon, and no subsequent judgment is made, and the next strip-shaped highlight region is processed continuously.

8. A method for detecting the arc starting phenomenon of a power distribution cabinet according to claim 1, characterized in that, The method for judging that the brightness from one end of the strip-shaped highlight region to the other end is monotonically increasing or decreasing includes: Taking the average value of the brightness of each pixel point in each sub-region as the brightness of each sub-region; Determine the brightness difference between the brightness of the latter sub-region and the brightness of the former sub-region according to the extension direction from one end to the other end of the long strip-shaped highlighted region, and obtain brightness differences; where is the number of sub-regions; Statistics The number of luminance differences greater than 0 and less than 0 among If the number of luminance differences greater than 0 among is greater than a preset luminance difference number judgment threshold, it is determined that the luminance from one end to the other end of the long strip-shaped high-brightness area is monotonically increasing; if the number of luminance differences less than 0 among is greater than a preset luminance difference number judgment threshold, it is determined that the luminance from one end to the other end of the long strip-shaped high-brightness area is monotonically decreasing.

9. An arc starting phenomenon detection system for a power distribution cabinet, characterized in that, Including: An image acquisition module for acquiring an image inside the power distribution cabinet; An end region construction module for constructing end regions corresponding to the two ends of the strip-shaped highlight region when there is a strip-shaped highlight region in the image inside the cabinet; A judgment module for dividing the strip-shaped highlight region into multiple sub-regions. If the angle between the line connecting one end of the strip-shaped highlight region to the other end and the horizontal direction is less than 45°, the strip-shaped highlight region is vertically divided into multiple sub-regions; If the angle between the line connecting one end of the strip-shaped highlight region to the other end and the horizontal direction is greater than 45°, the strip-shaped highlight region is horizontally divided into multiple sub-regions; If the angle between the line connecting one end of the strip-shaped highlight region to the other end and the horizontal direction is equal to 45°, the strip-shaped highlight region is horizontally or vertically divided into multiple sub-regions; Judging whether the number of strip-shaped highlight targets contained in each sub-region is 1. If so, judging whether the brightness difference between the two end regions of the strip-shaped highlight region is greater than a preset brightness difference threshold. If it is greater, judging whether the brightness change from one end to the other end is monotonically increasing or decreasing. If so, it is determined that an arc starting phenomenon has occurred inside the power distribution cabinet.

Images