In response to the complex terrain characterized by "70% mountains

10% water

and 20% farmland" in the coastal areas of southern Zhejiang

as well as the frequent occurrence of typhoons and salt fog

traditional manual operation and maintenance face challenges such as extensive visual blind spots

high operational risks

and delayed emergency response. This article addresses these issues by constructing a high-precision 3D laser point cloud model

enabling beyond visual line-of-sight (BVLOS) autonomous flight based on micro-terrain perception. By implementing a "segmented relay" operation mode

it overcomes the limitations of endurance and communication for long-distance power line inspections in mountainous areas. For typhoon disasters

an integrated emergency response strategy has been developed

encompassing rapid disaster assessment modeling

precise material delivery

and nighttime illumination. Application results show that

as of the end of 2024

this technological system has increased the coverage of inspectable areas in the region from 65% to 100%

achieving a defect identification accuracy rate exceeding 92%. This significantly enhances the operational resilience of coastal power grids under extreme environmental conditions.