With the construction of UHV lines

space constraints in transmission corridors inevitably lead to intersections between UHV lines and 500 kV AC lines.Notably

the lightning shielding performance of the 500 kV transmission line below the crossing differs significantly from the non-crossing sections.Based on the electro-geometric model

this paper simulates and examines the lightning shielding performance of an overhead double-circuit 1 000 kV AC transmission line on an underlying double-circuit 500 kV AC transmission line.Further

the study evaluates the influence of the lightning arrester installation modes on the shielding failure rate in each phase below double-circuit 500 kV AC transmission lines.The findings indicate that both the upper and lower lines demonstrate lightning shielding within 200 m from the crossing′s central point.Moreover

the closer they are to the center.The calculation results of the influence of lightning arrester erection modes reveal that

for the line being crossed below

it′s feasible to avoid installing lightning arresters on towers within a distance of one base from the crossing point.These findings provide reference for the lightning protection design of 500 kV AC lines intersected by UHV lines.