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Source: Science and Technology Daily

◎Reporter Zhang Yun and correspondent Wei Jie

"With the 'debut of drones', the ground wire hanging operation can be completed in 25 minutes. There is no need for personnel to climb towers to operate anymore. The efficiency is really high!" Recently, at the operation site of the 330 kV public-official line of the Qinghai Power Grid, Luo Long, a specialist in the transmission room of the State Grid Qinghai Ultra-High Voltage Company, said with emotion while looking at the drone operating at high altitude.

Qinghai Province has both farming and pastoral areas, as well as forest and mountainous areas. The power transmission lines are distributed over a wide range and have a large altitude difference. In such an environment, how to ensure the safety and efficiency of live-line operations? Drones provide the answer: Drones are used in multiple scenarios in Qinghai, a highland region, making inspections intelligent.

In recent years, State Grid Qinghai Electric Power has combined the characteristics of plateau power grid operation and maintenance, deepened the multi-scenario application of drones, promoted the digital transformation of operation and maintenance models, and realized intelligent drone inspections, diversified operations, and refined business. Digital technology empowers the construction of new power systems, making power grids smarter and safer.

In Huangnan Tibetan Autonomous Prefecture, towering trees can be seen everywhere. These "extended" branches can easily touch live lines, causing faults and tripping. Therefore, checking and clearing tree obstacles has become an important part of the local power supply company's work to ensure power supply during the peak summer season. Since June this year, transmission operation and maintenance personnel have continued to use drones to conduct line inspections.

"Under the traditional operation and maintenance model, the inspection and clearing of tree obstacles requires line patrol personnel to carry instruments for on-site measurement and inspection. Not only is there a large error and low efficiency, but the work intensity is also high." Liu Mingliang, director of the operation and inspection department of State Grid Huanghua Power Supply Company, said that drone inspection operations ensure the safe and stable operation of transmission lines.

Recently, operation and maintenance personnel used drones to conduct insulator contamination level inspections on the 750 kV Laning line. The system used was the first domestic "drone + spectral image analysis" insulator contamination detection system independently developed by State Grid Qinghai Electric Power.

The system organically combines the characteristics of drones that are not restricted by geographical locations with the advantages of high confidence and visualization of hyperspectral imaging technology. It uses image processing, feature extraction and other technologies to effectively reduce interference from factors such as ambient light and acquisition angles, and achieves rapid, non-destructive, and non-contact detection of insulator contamination. This innovation effectively solves the problem that manual tower sampling and detection in the traditional mode takes a long time and poses safety risks. At present, the system has been promoted and applied in Qinghai, Jiangsu, Inner Mongolia and other provinces and regions.

In addition, drone technology is also used in many aspects of Qinghai Power Grid's power facility flood prevention management, inspection management, power grid construction and maintenance, and personnel safety management, achieving effective early warning and rapid response to power facility risks and fault conditions, and improving the power grid's operation and maintenance guarantee capabilities and emergency response levels.

Since the beginning of this year, State Grid Qinghai Electric Power has used drones to carry out 78 special patrols to prevent external damage to transmission lines, achieving full coverage of potential damage points from internal and external forces in the jurisdiction, providing strong energy and power support for local economic and social development.