Method on Improving Measurement Accuracy and Precision of Transmission Line Clearance Distance

UHV DC transmission lines with the advantages of high electric power transmission capacity and long transmission distance have been successfully applied in China, of which operation security and reliability is of great importance to the power grid. Line corridors and channel operation, maintenance and patrol task is important to ensure the reliability of UHV DC transmission lines. Aiming at UHV DC transmission lines clearance distance measurement difficulties, such as large measurement error problem, unmanned aerial vehicle (UAV) for aerial photography was applied in this article, and with the help of the professional 3D graphics image processing software to generate to rapid, completed digital elevation model and digital orthogonal projection. To realize digital 3D effect real display for transmission lines, a custom software development was applied, by which transmission operation managers simply clicked objects to complete the automatically the minimum clearance distance check calculation for conductors of UHV transmission lines. The minimum clearance distance management system can effectively solve the clearance measure problems to enhance the complex transmission channel measurements and operation management, which is benefit for the construction the smart transmission lines.