A drone's view of wire icing conditions.
Recently, the Maintenance Management Center of Guizhou Power Grid Inspection and Inspection Company successfully used drones to conduct the "four-seeing triple-view" ice monitoring on the 500-kV Fuqing line G058. This achievement marks the completion of full coverage for artificial ice observation points within the center.
The "four sees" include: first, observing the type of ice coating; second, checking the short diameter of the ice; third, monitoring changes in the sag of the conductor; and fourth, assessing the condition of the equipment. The "triple focus" involves paying attention to the ice-covered ratio, tracking weather trends, and analyzing special terrains.
Drones provide a close-up view of the ice, allowing detailed inspection of transmission lines, especially the guide wires and ground wires. They can clearly capture the type of ice coating and measure both the length and diameter of the ice, making it easier to accurately determine the ice type and density. They also help assess the sag variation of the ground wire, check whether the electrical clearance between the conductor and overhead ground wire meets requirements after ice accumulation, and ensure that the cross-over clearance between the wire and ground wire is sufficient. Drones can detect issues such as tilted insulator strings, damaged clamps, spacers, and other components, as well as problems like slippage of the ground wire. Additionally, they help overcome challenges like fog, high towers, and difficult-to-reach areas where traditional manual inspections might miss critical ice buildup.
According to the ice monitoring team, the most important on-site task is calculating the ice-covered ratio using field data. Based on this, they decide whether to initiate ice melting by considering weather patterns and terrain conditions, ensuring the safe operation of the power line. If the ice-covered ratio reaches 0.5 or higher, immediate ice melting is required. If it's between 0.3 and 0.5, they evaluate factors like the expected number of consecutive icy days, local micro-topography, ice trend development, and its impact on the equipment before deciding whether to proceed with ice melting.
It is reported that the company has now fully integrated drones into their ice monitoring process. Compared to traditional manual inspections, drone-based ice viewing is several times more efficient, and in some terrains, the efficiency has increased by multiple times. (Source: People's Network - Guizhou Channel, Xu Lianggang, Zhao Liangwen)
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