CN-122023984-A - Live detection system and method for electrical test of transformer substation

Abstract

The invention provides a live detection system and method for an electrical test of a transformer substation, which belong to the technical field of power supply circuit monitoring, wherein the method comprises the steps of obtaining comprehensive efficiency weight of each frame of dial area image according to geometric distortion confidence index, environment interference punishment factors and local stability of meter reading values in an image sequence; the method comprises the steps of carrying out weighted fusion on the meter reading values of continuous multi-frame images based on comprehensive efficiency weight to obtain a meter reading fusion value at the current moment, carrying out physical constraint verification on the meter reading fusion value at the current moment according to the type of equipment to be detected, and outputting the detection result of the substation electrical test at the current moment.

Inventors

• CAO SEN
• CHEN JIEYUAN
• BAI YU
• LIU CHUNBO
• LI ZHENYU
• LIN HAIDAN
• LI YING
• LIU GENGHUA
• ZHANG DAN
• LIU FANG
• LIU LIWEI
• WU YUNFEI
• SUN DONGXUE
• LIU BO
• WANG JINQUAN
• Pu Huwan
• YANG NAIHUI
• JIN XIANJIE
• Zhen Xubo
• WU HAO
• XU SHENGCHEN
• ZHANG SAIPENG

Assignees

• 国网吉林省电力有限公司延边供电公司

Dates

Publication Date

20260512

Application Date

20260128

Claims (10)

1. 1. A live detection method for an electrical test of a transformer substation, the method comprising: Acquiring a continuous multi-frame image sequence of equipment to be detected in a transformer substation, identifying dial areas and meter reading values in each frame of image, and positioning and acquiring dial area images according to identification results; Obtaining a geometric distortion confidence index of each frame of dial area image by analyzing the geometric form of the dial area in each frame of dial area image, wherein the geometric distortion confidence index represents the distortion degree caused by the shooting view angle of the dial area in the image; Obtaining comprehensive efficiency weight of each frame of dial area image according to the geometric distortion confidence index, the environment interference penalty factor and the local stability of the meter reading value in the image sequence; and carrying out physical constraint verification on the meter reading fusion value at the current moment according to the type of the equipment to be detected, and outputting the detection result of the substation electrical test at the current moment.
2. 2. The method for detecting the electrical test electrification of the transformer substation according to claim 1, wherein the step of obtaining the geometric distortion confidence index of each frame of the dial area image by analyzing the geometric form of the dial area in each frame of the dial area image comprises the following steps: According to the geometric form of the dial area in each frame of dial area image, obtaining the dial deflection rate of each frame of dial area image; Acquiring the distribution deviation of scale marks of each frame of dial area image; And taking the product of the inverse proportion value of the scale mark distribution deviation of the t-frame dial area image and the dial deviation rate as the geometric distortion confidence index of the t-frame dial area image.
3. 3. The method for detecting the electrification of the electrical test of the transformer substation according to claim 2, wherein the step of obtaining the dial deflection rate of each frame of the dial area image according to the geometric form of the dial area in each frame of the dial area image comprises the following steps: The method comprises the steps of carrying out edge detection on a t frame dial region image through a Canny edge detection algorithm, extracting all edge pixel points of a dial region in the t frame dial region image, carrying out ellipse fitting on all edge pixel points of the dial region in the t frame dial region image by utilizing a least square method to obtain a fitted ellipse in the t frame dial region image, and recording the ratio between the short axis length and the long axis length of the fitted ellipse in the t frame dial region image as the dial unevenness of the t frame dial region image.
4. 4. The method for detecting the distribution deviation of scale marks of the electrical test of the transformer substation according to claim 2, wherein the step of obtaining the image of each dial area comprises the following steps: The method comprises the steps of presetting two length parameters l1 and l2, carrying out straight line detection on a t-frame dial area image through a Hough straight line detection algorithm to obtain all straight lines in the t-frame dial area image, and recording any straight line as an effective scale mark if the number of all pixel points on any straight line is greater than or equal to the length parameter l1 and less than or equal to the length parameter l2 for any straight line in the t-frame dial area image; and recording the absolute value of the difference between the average value of the angle characteristic values of all the effective graduation marks in the dial area image under the standard right-facing view angle and the average value of the angle characteristic values of all the effective graduation marks in the t-th frame dial area image as the graduation mark distribution deviation of the t-th frame dial area image.
5. 5. The method for detecting the electrification of the electrical test of the transformer substation according to claim 1, wherein the obtaining the environmental interference penalty factor of each frame of dial area image by analyzing the gray level distribution condition of the pixel points in each frame of dial area image comprises: acquiring exposure influence degree of each reflection area in each frame of dial area image according to gray level distribution conditions of pixel points in each frame of dial area image; Acquiring an edge texture map of a t-frame dial area image by using a Laplacian operator, and marking the average value of absolute values of all pixel values in the edge texture map as high-frequency component energy of the t-frame dial area image; And taking an inverse proportion normalization value of the product between the accumulated sum of the exposure influence degrees of all the reflection areas in the t-frame dial area image and the high-frequency component energy of the t-frame dial area image as an environment interference penalty factor of the t-frame dial area image.
6. 6. The method for detecting the electrification of the electrical test of the transformer substation according to claim 5, wherein the step of obtaining the exposure influence degree of each reflection area in each frame of dial area image according to the gray level distribution condition of the pixel points in each frame of dial area image comprises the following steps: Presetting a gray scale parameter a, and for any pixel point in a dial area image of a t frame, if the gray scale value of the any pixel point is larger than or equal to the gray scale parameter a, marking the any pixel point as an exposure pixel point; clustering all exposure pixel points in the dial area image of the t frame by using a DBSCAN clustering algorithm to obtain a plurality of clusters; and recording the ratio of the number of all pixel points in any one light reflecting area in the t-frame dial area image to the number of all pixel points in the t-frame dial area image as the exposure influence degree of the any one light reflecting area.
7. 7. The method for live detection of electrical tests of a transformer substation according to claim 1, wherein the obtaining the comprehensive performance weight of each frame of dial area image according to the geometric distortion confidence index, the environmental interference penalty factor and the local stability of the meter reading value in the image sequence comprises: Presetting a neighborhood parameter b, and marking a sequence formed by a nearest b-frame dial area image before a t-frame dial area image and a nearest b-frame dial area image after the t-frame dial area image as a t-frame local time window sequence; taking the inverse of the meter reading stability of the dial area image of the t frame and the normalized value of the product of the geometric distortion confidence index of the dial area image of the t frame and the environment interference punishment factor as the comprehensive efficiency weight of the dial area image of the t frame.
8. 8. The method for detecting the electrification of the electrical test of the transformer substation according to claim 1, wherein the weighting and fusion of the meter reading values of the continuous multi-frame images based on the comprehensive efficiency weight are carried out to obtain the meter reading fusion value at the current moment, and the method comprises the following steps: And recording the product of the comprehensive efficiency weight of the t-frame dial area image and the meter reading value in the t-frame dial area image as a weighted meter reading value in the t-frame dial area image, and taking the ratio of the accumulated sum of the weighted meter reading values in all the frame dial area images and the accumulated sum of the comprehensive efficiency weights of all the frame dial area images as a meter reading fusion value at the current moment.
9. 9. The method for live detection of electrical tests of a transformer substation according to claim 1, wherein the performing physical constraint verification on the fusion value of meter readings at the current moment according to the type of the equipment to be detected, and outputting the detection result of the electrical test of the transformer substation at the current moment comprises: Reading the meter reading value at the previous moment and recording the meter reading value as a historical meter reading value, and obtaining the change rate between the meter reading fusion value and the historical meter reading value; If the change rate between the meter reading fusion value and the historical meter reading value is larger than the maximum change rate allowed by the meter in the equipment to be detected, judging that the currently identified meter reading fusion value is an abnormal reading value, discarding the meter reading fusion value and outputting the historical meter reading value, and if the change rate between the meter reading fusion value and the historical meter reading value is smaller than or equal to the maximum change rate allowed by the meter in the equipment to be detected, outputting the meter reading fusion value.
10. 10. A live detection system for electrical tests of a substation, comprising a memory, a processor and a computer program stored on the memory and operable on the processor, wherein the computer program when executed by the processor implements the steps of a method for monitoring and pre-warning geological disasters of a highway slope according to any one of claims 1-9.

Description

Live detection system and method for electrical test of transformer substation Technical Field The invention belongs to the technical field of power supply circuit monitoring, and particularly relates to a live detection system and method for an electrical test of a transformer substation. Background In the daily operation and maintenance and electrical test of the transformer substation, a large number of analog indication meters (such as an arrester action counter, a conservator oil level meter and an SF6 gas density relay) and mechanical switch equipment (such as a disconnecting switch contact and a grounding switch position) which rely on manual or visual confirmation exist. With the development of the intelligent power grid, the inspection robot and the fixed monitoring camera gradually replace manual inspection. These automation devices typically acquire visible light images and perform image recognition using a deep learning algorithm such as Convolutional Neural Network (CNN) to obtain the value of the meter. Because the transformer substation is usually located in an outdoor complex environment, the strong change of the illumination condition of the transformer substation can lead to strong high-light reflection of dial glass, so that image information is lost, and the transformer substation is limited by the fixation of a camera position, the acquired images often have perspective distortion of different degrees, so that the recognized meter reading is strongly jumped in a short time, and huge errors exist in an output result, so that the accuracy of transformer substation state evaluation is seriously influenced. Disclosure of Invention The invention provides a live detection system and method for an electric test of a transformer substation, which aims to solve the problem of low accuracy of a transformer substation instrument due to lack of effective measurement of quality of image data and lack of physical logic constraint on an output result in complex illumination and variable visual angle environments of the transformer substation. In order to achieve the above object, the present invention provides the following technical solutions: Acquiring a continuous multi-frame image sequence of equipment to be detected in a transformer substation, identifying dial areas and meter reading values in each frame of image, and positioning and acquiring dial area images according to identification results; Obtaining a geometric distortion confidence index of each frame of dial area image by analyzing the geometric form of the dial area in each frame of dial area image, wherein the geometric distortion confidence index represents the distortion degree caused by the shooting view angle of the dial area in the image; Obtaining comprehensive efficiency weight of each frame of dial area image according to the geometric distortion confidence index, the environment interference penalty factor and the local stability of the meter reading value in the image sequence; and carrying out physical constraint verification on the meter reading fusion value at the current moment according to the type of the equipment to be detected, and outputting the detection result of the substation electrical test at the current moment. Preferably, the obtaining the geometric distortion confidence index of each frame of dial area image by analyzing the geometric form of the dial area in each frame of dial area image includes: According to the geometric form of the dial area in each frame of dial area image, obtaining the dial deflection rate of each frame of dial area image; Acquiring the distribution deviation of scale marks of each frame of dial area image; And taking the product of the inverse proportion value of the scale mark distribution deviation of the t-frame dial area image and the dial deviation rate as the geometric distortion confidence index of the t-frame dial area image. Preferably, the obtaining the dial deflection rate of each frame of dial area image according to the geometric form of the dial area in each frame of dial area image includes: The method comprises the steps of carrying out edge detection on a t frame dial region image through a Canny edge detection algorithm, extracting all edge pixel points of a dial region in the t frame dial region image, carrying out ellipse fitting on all edge pixel points of the dial region in the t frame dial region image by utilizing a least square method to obtain a fitted ellipse in the t frame dial region image, and recording the ratio between the short axis length and the long axis length of the fitted ellipse in the t frame dial region image as the dial unevenness of the t frame dial region image. Preferably, the acquiring the distribution deviation of the scale marks of the dial area image of each frame includes: The method comprises the steps of presetting two length parameters l1 and l2, carrying out straight line detection on a t-frame dial area image through a Hough s