Abstract
To better monitor the state of isolating switches, an efficient binocular vision-based state measurement system is proposed in this article. Two optimal cameras are selected as the vision of our inspection system. Firstly, stereo calibration and distortion rectification are performed on acquired image pair. Secondly, to recover the three-dimensional information of switch, we propose a semi-global stereo matching method by using data- and structure-driven cost volume fusion and then optimizing raw disparity map with weighted- and edge discriminated-smoothness prior. Gradient content is enforced on the weight for suppressing small-weight-accumulation problem in weak-textured regions. Besides, Hough transform with feature constraints is implemented for removing the chaotic lines and extracting center line of the switch arm. Finally, based on the center line and corresponding disparity map of the switch arm, triangulation principle is used for calculating the true angle between the switch arm and insulator such that whether or not the isolating switch is fully closed can be detected. The experimental results demonstrate that the proposed stereo matching method can achieve good performance in Middlebury v.3 data set and switch images, and the system can precisely measure the state of switches.
Highlights
In a power system, monitoring the state of the substation equipment is a significant task.[1]
Based on our proposed semi-global stereo matching method, we present a complete binocular vision system that can be employed to calculate the true angle between the switch arm and insulator, which consists of stereo calibration and rectification, switch detection, center line extraction of switch arm, stereo matching, and depth calculation
To deal with the safety hazard caused by switch disconnection in power system, an efficient binocular stereo visionbased state measurement system is proposed in this article
Summary
In a power system, monitoring the state of the substation equipment is a significant task.[1] Isolating switch is the most frequently used device in high-voltage switchgear.[2,3] the operating principle and structure of isolating switch are relatively simple, it is relatively prone to failure because of large amount of use. Most of switches operate outdoors, so the equipment components can be inevitably oxidized. The aging of the transmission parts leads to the deviated rotation angle and the incomplete closure of the isolating switch. Whether the switch is completely closed has a great influence on the safety of a substation. To ensure the safety and reliability of the substation
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