An Accurate Aerial Survey Method for Three-span Sections of Transmission Lines

Abstract

The invention relates to the technical field of transmission line measurement, in particular to an accurate aerial survey method for a three-span section of a transmission line, which uses an unmanned aerial vehicle to measure each key point of a transmission cable in a three-span section, and establishes an ideal virtual system based on these key points. Model, get the ideal coordinates of the lowest sag point, and then take ordinary and thermal imaging shots of multiple transmission cables in the three-span section through the UAV, and get the arc of the transmission cable at a special angle Model, after calculating and restoring the arc model under the oblique perspective to the standard arc model, the actual coordinate value of the lowest sag point is obtained according to the ratio, and finally by comparing the ideal coordinate and the actual coordinate difference of the lowest sag point Amplitude judges the status of the transmission cable.

Description

technical field [0001] The invention relates to the technical field of transmission line measurement, in particular to an accurate aerial survey method for a three-span section of a transmission line. Background technique [0002] The "three-span" section is a section where the overhead transmission line crosses high-speed railways, expressways and important transmission channels. Since the "three-span" section of the transmission line has a long span and is very high, and the environment in which it is located is also very complicated, if To photograph and measure the transmission cable in the "three-span" section from the ground, the measuring instruments and cameras will be restricted by environmental occlusion, and because the span of the transmission cable in the "three-span" section is too large, the measurer When it is on the ground, it is impossible to directly measure the overall transmission cable due to the distance limitation. Therefore, many of the existing tran...

AI Technical Summary

Problems solved by technology

[0002] The "three-span" section is a section where the overhead transmission line crosses high-speed railways, expressways and important transmission channels. Since the "three-span" section of the transmission line has a long span and is very high, and the environment in which it is located is also very complicated, if To photograph and measure the transmission cable in the "three-span" section from the ground, the measuring instruments and cameras will be restricted by environmental occlusion, and because the span of the transmission cable in the "three-span" section is too large, the measurer When it is on the ground, it is impossible to directly measure the overall transmission cable due to the distance limitation. Therefore, many of the existing transmission lines in the "three-span" section are measured by drones. There are the following defects in the aerial measurement of the section power line: (1) When the UAV power line is photographed downward, the obtained image is greatly affected by the complex background texture, and the complete edge contour is often not extracted; ( 2) When the UAV shoots from above the transmission line, the obtained image is greatly affected by the backlight, and it is difficult to obtain a clear image of the transmission cable; (3) When the UAV shoots from the horizontal position of the transmission cable When shooting, because there are more than one power transmission cable, it is difficult to distinguish each power transmission cable in the obtained image, so it is difficult to measure the radian of the power transmission cable from the obtained image; (4) After measuring the radian, it is necessary to pass The experience of the staff judges whether the radian of the transmission cable is normal, and it is not suitable for staff who lack experience

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