According to the operation status of the 1 000 kV Yuheng-Weifang UHV AC transmission lines currently completed and put into operation

steel frame structures such as greenhouses exist under the lines

and heavy inductive currents will be generated in the steel frame structures. To ensure the safety of agricultural workers

a steel frame greenhouse was taken as an example

and the calculation model of UHV AC double-circuit transmission lines with the infinite element was established by the Ansys simulation software. Moreover

the induced voltage and induced current generated on the steel frame were calculated by simulation. According to simulation results

by using finite element-infinite element method for modeling and simulation

the simulation efficiency of the computer is improved obviously. The induced voltage and induced current density on the steel frame structure under the lines are greatly affected by the current level of the lines and the distance between the steel frame and the line axis. The influence of erection height on induced voltage and induced current varies with the distance between steel frame and line axis. After factors such as line erection cost and transmission efficiency are taken into consideration

it is recommended to design the line 70 meters away from the building.