To address the prominent issue of insufficient safety distance between high-voltage transmission lines and buildings in the process of urbanization

this paper compares and analyzes the technical and economic feasibility of conventional solutions.Using a comprehensive evaluation and optimization integration method

a horizontal distance optimization scheme based on cross arm local renovation and herringbone insulation string combination

as well as a vertical distance optimization scheme for suspension tension composite insulator strings

are proposed.Taking the 110?kV double circuit line and 220?kV single circuit line as examples

the optimized horizontal safety distance has been increased by 2.3?m and the vertical safety distance has been increased by 2.5?m

saving investment by 33% to 50% and shortening the construction period by 50% to 60% compared to the conventional plan.This plan achieves a balance between safety and economy through technological integration and structural innovation

providing a scalable engineering paradigm for addressing safety hazards in urban high-voltage transmission lines.