To address the limitations of adopting single conductor erection mode in research on the electromagnetic environmental impacts of 750 kV transmission lines

four typical erection schemes are selected: single-circuit lines

double- circuit lines on the same tower

parallel single-circuit lines

and parallel layout of single-circuit lines and double-circuit lines on the same tower. On the basis of electromagnetic induction theory and superposition principle

the equivalent charge method and Ampère′s law are used to predict electromagnetic impacts and conduct compliance analysis. By clarifying key parameters including tower types

conductor parameters and conductor height above ground for each scenario

the distribution of electromagnetic field strength at 1.5 m above the ground is predicted. Compliance evaluation is carried out in accordance with GB 8702—2014“Controlling Limits for Electromagnetic Environment”. The results show that affected by conductor height

phase spacing and erection mode

the maximum electromagnetic field strength of the four schemes is located in the center or near the line corridor. By differentially increasing the conductor heights

the power frequency electric field strength can meet the control limit of 10 kV/m applicable to non-residential areas

and the power frequency magnetic flux density ranges from 12.39 μT to 28.19 μT

which is far below the control limit of 100 μT.