Newly designed identifying method for ice thickness on high‐voltage transmission lines via machine vision

Abstract

The icing of transmission lines will bring considerable challenges to the safe operation of the power grid. Therefore, a novel method combines machine vision and machine learning algorithms for identifying the ice thickness on high-voltage transmission line (HVTL) as proposed herein. First, noise and background interference in the image are filtered, and the grey image is used as input. Then, the algorithms of improved Canny edge detection, Hough transform, improved K-means clustering, and least-squares fitting are adopted in turn to locate the edges of conductors. Finally, according to the distance mapping model based on monocular vision, the ice thickness of the conductor is determined by calculating the width difference before and after icing. The experimental results show that the proposed method can accurately locate the edge of the conductor in both field and experimental environments. Moreover, it can ensure ideal effects under different illumination and hardly not be affected by distortion in both horizontal and vertical directions. Besides, the distance mapping model can map the pixel distance to the actual distance with high precision, no matter whether the background is simple or complex, and the calculated ice thickness has only a small deviation compared to the actual value. In addition, the proposed method shows high reliability and effectiveness when various interference such as different backgrounds, uneven icing, height difference changes, conductor movement, contrast changes, and conductor sag occur.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

Experimental study on ice monitoring method for 10 kV transmission line with tangent tower in alpine landform

“…Therefore, as Equation (10) shows, the l v0 equals the l v when icing. 2.5.3 | Calculation of vertical span if ε is not 0 Equation ( 8) is substituted into Equation ( 2) to obtain the pressure equation as shown in Equation (11).…”

“…Where σ 0 is the horizontal stress at the time of erection (MPa); t 0 is the temperature at the time of erection (°C); e is the elastic modulus of the conductor (MPa); α is the coefficient of linear expansion of the conductor (1/°C). Therefore, the combination of Equations ( 8), (11), and ( 12) is used to calculate the l v , which is as Equation (13).…”

“…The real ice shape can be reflected by edge identification technology in the image method for 110 kV and above transmission lines [10][11][12]. However, the potential block on the lens of the camera by ice would make it impossible to observe in severe weather.…”

Detection methods for foreign objects in transmission tower poles based on improved YoLov4-tiny

“…There are many studies on end-to-end networks, such as Weng Zhi and others when detecting key parts of transmission lines, The following improvements were made to YoLoV3, The Res2Net residual module was added to the original model. The application of migration learning enhances the integration of up and down information and improves the accuracy of network to small goals [9] . He Xiangjie et al, on the SPP structure improvements mainly using hollow convolution to replace the three maximum pooled layers, and added a residual block behind the SPP structure [15] ，Although the method can achieve feature fusion, it becomes more complex in terms of structure.…”

Experimental study on dynamic response characteristics of isolated‐span transmission lines after ice‐shedding

“…As an important section of the transmission lines, isolated-span transmission lines are widely adopted to connect two tension towers at some complex terrain zones, such as crossing high mountains, broad rivers, large-scale facilities etc. Ice disasters threaten the normal operation of the grid [2][3][4][5]. Ice accumulating on conductors drops down in the case of rising temperature or wind excitation, called ice-shedding.…”